Aerial ladder fire truck

Abstract

The invention discloses an aerial ladder fire fighting truck, relates to the technical field of fire fighting equipment, and aims to solve the problem that in the prior art, an aerial ladder fire fighting truck is large in overall size and cannot adapt to rescue in narrow regions. The aerial ladder fire truck comprises a working bucket, a telescopic aerial ladder, a rotary table and a frame, a cab, a coaming and an aerial ladder support are arranged on the frame, the working bucket is hinged to the telescopic aerial ladder, the end, away from the working bucket, of the telescopic aerial ladder is hinged to the rotary table, a variable-amplitude oil cylinder is arranged on the rotary table, and the output end of the variable-amplitude oil cylinder is in transmission connection with the telescopic aerial ladder; two groups of supporting leg mechanisms are arranged below the frame, one group of supporting leg mechanism is positioned below the cab, and the other group of supporting leg mechanism is positioned at the tail of the vehicle; a pedal is arranged on the turntable. The frame adopts a pickup truck chassis, so that the size of the whole vehicle is greatly reduced, the turning radius is small, and the vehicle can flexibly enter and adapt to complex rescue environments such as old communities and narrow streets.

Description

Technical Field

[0001] This invention relates to the field of fire-fighting equipment technology, and in particular to a fire ladder truck, which has a more compact overall size and strong mobility. Background Technology

[0002] With the acceleration of urbanization in China, old residential communities with 6-8 stories are densely packed, with narrow internal roads and insufficient fire-fighting facilities. Currently, the main fire-fighting ladder trucks in China are usually modified from medium or heavy truck chassis, which have inherent disadvantages such as large overall size, large turning radius, poor passability, and insufficient flexibility. They are difficult to deploy quickly and operate efficiently in special rescue environments such as old residential communities and narrow alleys, and their combat effectiveness is severely restricted.

[0003] In existing technology, typical aerial ladder fire trucks are generally modified from truck chassis and use H-type outriggers for support, which have the following main drawbacks: Poor frontal stability: The front outriggers are located behind the cab. Since the weight of the cab is concentrated at the front, the platform (work bucket) has insufficient overall stability when operating in front.

[0004] Poor overall vehicle flexibility: The truck chassis is large, making turning and maneuvering difficult, and it is often impossible to find a suitable support position in narrow areas.

[0005] Inconvenient for personnel to go up and down: The rear of the ladder is high off the ground, and when firefighters return to the ground from the work basket, they usually need to use an external pull-out ladder attached to the back of the ladder, which is cumbersome and poses a safety hazard.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide a ladder truck for improving the flexibility and site adaptability of fire ladder trucks.

[0008] To achieve the above objectives / to solve the above technical problems, the present invention is implemented using the following technical solution: A ladder fire truck includes a working bucket, a telescopic ladder, a turntable, and a frame. The frame is equipped with a driver's cab, side panels, and a ladder support. The working bucket is hinged to the telescopic ladder, and the end of the telescopic ladder away from the working bucket is hinged to the turntable. The turntable is equipped with a luffing cylinder, the output end of which is connected to the telescopic ladder drive. Two sets of outrigger mechanisms are installed under the frame; one set of outrigger mechanisms is located under the cab, and the other set of outrigger mechanisms is located at the rear of the vehicle. A foot pedal is provided on the turntable.

[0009] To improve the mobility of aerial ladder fire trucks in narrow roads, a pickup truck chassis was used instead of the existing truck chassis, reducing the overall size of the aerial ladder fire truck and enabling it to turn and maneuver in confined areas. Furthermore, by placing two sets of outrigger mechanisms under the cab and rear of the vehicle respectively, the weight of the entire cab and engine compartment becomes an effective stabilizing counterweight. This design optimizes the overall vehicle structure layout, placing the main structural weight on the front outrigger mechanisms, increasing stabilizing torque, and effectively improving the anti-tipping stability of the work bucket when operating at the front. A turntable is used to rotate the telescopic ladder and work bucket at a certain angle; side panels are used to enclose the chassis; the ladder support frame provides support for the telescopic ladder, ensuring its stability during vehicle movement; and a footboard facilitates personnel boarding and alighting the telescopic ladder. A luffing cylinder is used to move the telescopic ladder up and down.

[0010] Furthermore, the frame is equipped with a seat ring, and the seat ring is equipped with a slewing bearing, with the turntable rotatably connected to the slewing bearing.

[0011] A slewing bearing is provided between the seat ring on the frame and the turntable. The turntable can rotate around the slewing bearing. The slewing bearing is driven by a hydraulic motor to drive a worm gear mechanism, thereby driving the telescopic ladder and the work bucket to rotate as a whole. The drive mechanism of the slewing bearing is existing technology and will not be described in detail here.

[0012] Furthermore, the outrigger mechanism is X-shaped, including a primary leg, a secondary leg, a foot plate, and a outrigger hinge point. A support structure is provided on the frame, the outrigger hinge point is hinged to the support structure, the primary leg is fastened to the outrigger hinge point, the secondary leg is slidably connected to the primary leg, the foot plate is hinged to the secondary leg, and a support leg cylinder is provided on the support structure. The output end of the support leg cylinder is connected to the secondary leg via a transmission.

[0013] The outrigger mechanism has an X-shaped structure, consisting of a primary leg, a secondary leg fitted inside it, and a foot plate at the end. During operation, the secondary leg extends, the support leg cylinder actuates, driving the entire outrigger mechanism to swing diagonally downwards until the foot plate stably supports the ground. The outrigger hinge point is hinged to the support structure, providing a hinge point for the swing of the primary leg. At this time, the vehicle tires are still in contact with the ground, improving adaptability to uneven ground.

[0014] Furthermore, handrails are provided on the pedals.

[0015] The handrails make it easier for people to get on and off the step.

[0016] Furthermore, the frame includes an upper longitudinal beam and a lower longitudinal beam, which are connected together by several crossbeams and vertical beams.

[0017] The chassis is a reinforced frame structure, welded together from multiple upper and lower longitudinal beams, crossbeams, and vertical beams to form a high-strength spatial frame. This chassis directly supports the cab and turntable, eliminating the need for the heavy additional subframe required in traditional truck-type ladder trucks, thus achieving weight reduction.

[0018] Furthermore, the axle and wheel assemblies are suspended from the bottom of the frame by leaf springs.

[0019] Leaf springs and axle wheel assemblies constitute the chassis suspension system of a vehicle. The specific configuration is existing technology and will not be described in detail here.

[0020] Furthermore, two ladders are symmetrically provided on the side of the panel near the footboard.

[0021] During rescue operations, firefighters can climb the ramp from the ground using any side of the ladder that is not obstructed by the telescopic ladder, and then safely enter the rear of the telescopic ladder via the steps and handrails.

[0022] Furthermore, the telescopic ladder is equipped with a rear luffing hinge point at the end away from the working bucket, and the rear luffing hinge point is hinged to the turntable.

[0023] The rear luffing hinge point of the telescopic ladder is located at the very rear of its main body. The telescopic ladder is directly hinged to the turntable through the rear luffing hinge point, and the luffing cylinder also acts directly on the telescopic ladder. This eliminates the need for an intermediate transition bracket structure, simplifies the force transmission path, and ensures that the telescopic ladder does not have a tail swing when it moves up and down, thus not affecting personnel climbing.

[0024] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: 1. The vehicle uses a pickup truck chassis, which significantly reduces the overall size of the vehicle and its turning radius, allowing it to flexibly enter and adapt to complex rescue environments such as old residential areas and narrow streets. By placing two sets of outrigger mechanisms under the cab and the rear of the vehicle respectively, the weight of the entire cab and engine compartment becomes an effective stabilizing counterweight. This design optimizes the overall structural layout of the vehicle, placing the main structural weight in the outrigger mechanisms at the front, increasing the stabilizing torque, and thus effectively improving the anti-tipping stability of the work bucket when operating at the front.

[0025] 2. The outrigger mechanism is positioned below the cab, effectively improving the anti-tipping stability of the work platform when operating in front. Steps and handrails are integrated into the turntable, and double ladders are installed on the side panels, creating a safe passage for personnel to enter and exit without the need for external ladders, thus improving rescue efficiency and safety. The transition bracket on the ladder has been eliminated, and a reinforced integrated frame and X-shaped outrigger mechanism have been adopted, achieving a lightweight and compact overall vehicle structure while ensuring strength and functionality. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this disclosure 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 this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the telescopic ladder of the present invention; Figure 3 This is a schematic diagram of the fire truck chassis structure of the present invention; Figure 4 This is a schematic diagram of the telescopic ladder movement of the present invention; Figure 5 This is a schematic diagram of the support leg mechanism of the present invention; Figure 6 This is a schematic diagram of the turntable structure of the present invention; Figure 7 This is a schematic diagram of the vehicle frame structure of the present invention.

[0028] In the diagram: 1. Working bucket; 2. Telescopic ladder; 21. Rear luffing hinge point; 3. Turntable; 32. Handrail; 4. Luffing cylinder; 5. Outrigger mechanism; 51. Primary leg; 52. Secondary leg; 53. Outrigger plate; 54. Outrigger hinge point; 6. Side panel; 7. Ladder; 8. Cab; 9. Step; 10. Frame; 101. Upper longitudinal beam; 102. Seat ring; 103. Lower longitudinal beam; 104. Crossbeam; 105. Vertical beam; 106. Support structure; 12. Ladder support frame; 13. Slewing bearing; 14. Outrigger cylinder; 15. Leaf spring; 16. Axle and wheel assembly. Detailed Implementation

[0029] 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 application or its application or use. Example 1

[0030] like Figure 1 As shown, this embodiment provides a ladder fire truck, including a working bucket 1, a telescopic ladder 2, a turntable 3, and a frame 10. The frame 10 is provided with a driver's cab 8, a side panel 6, and a ladder support 12. The working bucket 1 is hinged to the telescopic ladder 2. The end of the telescopic ladder 2 away from the working bucket 1 is hinged to the turntable 3. The turntable 3 is provided with a luffing cylinder 4. The output end of the luffing cylinder 4 is connected to the telescopic ladder 2 in a transmission. Two sets of outrigger mechanisms 5 are provided under the frame 10. One set of outrigger mechanisms 5 is located under the cab 8, and the other set of outrigger mechanisms 5 is located at the rear of the vehicle. The turntable 3 is equipped with a pedal 9.

[0031] To improve the mobility of the aerial ladder fire truck in narrow roads, a pickup truck chassis 10 is used instead of the existing truck chassis, thereby reducing the overall size of the aerial ladder fire truck and enabling it to turn and maneuver in confined areas. Furthermore, by placing two sets of outrigger mechanisms 5 under the cab 8 and the rear of the vehicle respectively, the weight of the entire cab 8 and engine compartment becomes an effective stabilizing counterweight. This design optimizes the overall vehicle structure layout, placing the main structural weight at the front outrigger mechanism 5, increasing the stabilizing torque, and thus effectively improving the anti-tipping stability of the work bucket 1 when operating at the front. The turntable 3 is used to rotate the telescopic ladder 2 and work bucket 1 by a certain angle; the side panel 6 is used to enclose the chassis 10; the ladder support 12 provides support for the telescopic ladder 2, ensuring its stability while the aerial ladder fire truck is in motion; the step 9 facilitates personnel getting on and off the telescopic ladder 2. The luffing cylinder 4 is used to move the telescopic ladder 2 up and down.

[0032] like Figure 2-4 As shown, the frame 10 is provided with a seat ring 102, and the seat ring 102 is provided with a slewing bearing 13. The turntable 3 is rotatably connected to the slewing bearing 13.

[0033] A slewing bearing 13 is provided between the seat ring 102 on the frame 10 and the turntable 3. The turntable 3 can rotate around the slewing bearing 13. The slewing bearing 13 is driven by a hydraulic motor to drive a worm gear mechanism, thereby driving the telescopic ladder 2 and the work bucket 1 to rotate as a whole. The drive mechanism of the slewing bearing 13 is existing technology and will not be described in detail here.

[0034] like Figure 5 As shown, the outrigger mechanism 5 is X-shaped and includes a primary leg 51, a secondary leg 52, a foot plate 53, and an outrigger hinge point 54. A support structure 106 is provided on the frame 10. The outrigger hinge point 54 is hinged to the support structure 106. The primary leg 51 is fastened to the outrigger hinge point 54. The secondary leg 52 is slidably connected to the primary leg 51. The foot plate 53 is hinged to the secondary leg 52. A support leg cylinder 14 is provided on the support structure 106. The output end of the support leg cylinder 14 is connected to the secondary leg 52 in a transmission manner.

[0035] The outrigger mechanism 5 has an X-shaped structure, consisting of a primary leg 51, a secondary leg 52 fitted inside it, and a foot plate 53 at the end. During operation, the secondary leg 52 extends, the support leg cylinder 14 actuates, driving the entire outrigger mechanism 5 to swing downwards at an angle until the foot plate 53 stably supports the ground. The outrigger hinge point 54 is hinged to the support structure 106, providing a hinge point for the swing of the primary leg 51. At this time, the vehicle tires are still in contact with the ground, improving adaptability to uneven ground.

[0036] like Figure 6 As shown, the pedal 9 is equipped with a handrail 32.

[0037] Handrail 32 facilitates people getting on and off the step 9.

[0038] like Figure 7 As shown, the frame 10 includes an upper longitudinal beam 101 and a lower longitudinal beam 103, which are connected together by a number of crossbeams 104 and vertical beams 105.

[0039] The frame 10 is a reinforced frame structure, welded together from multiple upper longitudinal beams 101 and lower longitudinal beams 103, cross beams 104 and vertical beams 105 to form a high-strength spatial frame. This frame 10 directly supports the cab 8 and turntable 3, eliminating the need for the heavy additional subframe required by traditional truck-type ladder trucks, thus achieving lightweight design.

[0040] like Figure 3 As shown, the bottom of the frame 10 is suspended from the axle wheel assembly 16 by a leaf spring 15.

[0041] The leaf spring 15 and the axle wheel assembly 16 constitute the chassis suspension system of the vehicle. The specific configuration is existing technology and will not be described in detail here.

[0042] like Figure 2 As shown, two ladders 7 are symmetrically arranged on the side of the enclosure 6 near the footboard 9.

[0043] During rescue operations, firefighters can climb the ramp 7 from the ground on either side of the ramp 2 that is not obstructed by the telescopic ladder 2, and then safely enter the rear of the telescopic ladder 2 via the step 9 and handrail 32. Example 2

[0044] like Figure 4 As shown, in order to avoid tail swing when the telescopic ladder 2 changes its amplitude, which would affect the climbing of personnel, a rear luffing hinge point 21 is provided at the end of the telescopic ladder 2 away from the working bucket 1. The rear luffing hinge point 21 is hinged to the turntable 3.

[0045] The rear luffing hinge point 21 of the telescopic ladder 2 is located at the rear end of its body. The telescopic ladder 2 is directly hinged to the turntable 3 through the rear luffing hinge point 21. The luffing cylinder 4 also acts directly on the telescopic ladder 2, eliminating the intermediate transition bracket structure and simplifying the force transmission path. This ensures that the telescopic ladder 2 has no tail swing when it moves up and down, and does not affect personnel climbing.

[0046] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to explain the relative positional relationship and movement between components in a specific posture. If the specific posture changes, the directional indication will also change accordingly. These terms are used only for the convenience of describing this application and for simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this application.

[0047] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0049] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A ladder truck, characterized in that, include: The vehicle includes a work bucket (1), a telescopic ladder (2), a turntable (3), and a frame (10). The frame (10) is equipped with a driver's cab (8), a side panel (6), and a ladder support (12). The work bucket (1) is hinged to the telescopic ladder (2). The end of the telescopic ladder (2) away from the work bucket (1) is hinged to the turntable (3). The turntable (3) is equipped with a variable amplitude cylinder (4). The output end of the variable amplitude cylinder (4) is connected to the telescopic ladder (2) for transmission. Two sets of outrigger mechanisms (5) are provided under the frame (10). One set of outrigger mechanisms (5) is located under the cab (8), and the other set of outrigger mechanisms (5) is located at the rear of the vehicle. The turntable (3) is equipped with a pedal (9).

2. The ladder fire truck according to claim 1, characterized in that: The frame (10) is provided with a seat ring (102), and the seat ring (102) is provided with a slewing bearing (13). The turntable (3) is rotatably connected to the slewing bearing (13).

3. A ladder fire truck according to claim 1, characterized in that: The outrigger mechanism (5) is X-shaped and includes a primary leg (51), a secondary leg (52), a foot plate (53), and a outrigger hinge point (54). The frame (10) is provided with a support structure (106). The outrigger hinge point (54) is hinged to the support structure (106). The primary leg (51) is fastened to the outrigger hinge point (54). The secondary leg (52) is slidably connected to the primary leg (51). The foot plate (53) is hinged to the secondary leg (52). The support structure (106) is provided with a support leg cylinder (14). The output end of the support leg cylinder (14) is connected to the secondary leg (52) in a transmission manner.

4. A ladder fire truck according to claim 1, characterized in that: The pedal (9) is provided with a handrail (32).

5. A ladder fire truck according to claim 1, characterized in that: The frame (10) includes an upper longitudinal beam (101) and a lower longitudinal beam (103), which are connected together by a number of crossbeams (104) and vertical beams (105).

6. A ladder fire truck according to claim 1, characterized in that: The bottom of the frame (10) is suspended by a leaf spring (15) from the axle wheel assembly (16).

7. A ladder fire truck according to claim 1, characterized in that: Two ladders (7) are symmetrically provided on the side of the enclosure (6) near the footboard (9).

8. A ladder fire truck according to claim 1, characterized in that: The telescopic ladder (2) is provided with a rear luffing hinge point (21) at one end away from the working bucket (1), and the rear luffing hinge point (21) is hinged to the turntable (3).

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