High-rise building demolition fire truck and telescopic arm device thereof

Abstract

The application belongs to the technical field of fire-fighting equipment, and particularly relates to a high-lifting and breaking fire truck and a telescopic arm device thereof. The telescopic arm device comprises a base arm and a breaking arm. The base arm is used for being connected with a vehicle body of the high-lifting and breaking fire truck. The breaking arm comprises an inner section arm, an outer section arm and a telescopic driving mechanism. The inner section arm is movably sleeved in the outer section arm. The end of the inner section arm extending into the outer section arm is connected with the outer section arm through the telescopic driving mechanism. The end of the inner section arm extending out of the outer section arm is provided with a breaking tool. The outer section arm is hinged with the base arm. The telescopic arm device of the application designs the breaking arm as a telescopic structure of the nested cooperation of the inner section arm and the outer section arm, replaces the traditional fixed-length breaking arm structure, and can directly flexibly adjust the working length through the telescopic breaking arm without only adjusting the base arm angle to change the working range. The mobility of the high-lifting and breaking fire truck when working in a narrow space is greatly improved, so that the performance of the high-lifting and breaking fire truck under complex working conditions is improved.

Description

Technical Field

[0001] This application belongs to the technical field of fire-fighting equipment, specifically relating to a fire truck with elevated demolition system and its telescopic boom device. Background Technology

[0002] The aerial ladder truck is a special fire truck designed for fire fighting, rescue, and demolition operations in high-rise buildings. It can operate at a height of up to 30 meters and is equipped with demolition tools such as hydraulic breakers and hydraulic shears at the end of its boom. It can complete key operations such as demolition of high-rise buildings and removal of obstacles, playing an important role in the field of fire emergency rescue.

[0003] In existing technologies, the final section of the boom of a high-reach demolition fire truck is designed with a fixed length. Regarding this technology, high-reach demolition fire trucks need to adjust the angle of the base boom to change their operating range during operation. Using a non-adjustable boom structure severely limits maneuverability in confined spaces, easily causing interference between the boom and surrounding obstacles, and posing a safety risk of boom collision damage. Summary of the Invention

[0004] The purpose of this application is to provide a high-lift demolition fire truck and its telescopic boom device to improve the performance of the high-lift demolition fire truck.

[0005] To achieve the above objectives, this application provides a telescopic boom device for a high-lift demolition fire truck, comprising: The base boom is used to connect to the body of the aerial demolition fire truck; The demolition arm includes an inner arm, an outer arm, and a telescopic drive mechanism. The inner arm is movably sleeved inside the outer arm. The end of the inner arm extending into the outer arm is connected to the outer arm via the telescopic drive mechanism. The end of the inner arm extending out of the outer arm is provided with a demolition tool. The outer arm is hinged to the base arm.

[0006] In some embodiments, an anti-wear mechanism is provided between the outer arm and the inner arm.

[0007] In some embodiments, the wear-resistant mechanism includes a fixed base, a slider, and an elastic element. A sliding track is formed within the fixed base, the slider is movably engaged with the sliding track, the elastic element connects the slider and the fixed base, and the elastic element extends and retracts along the sliding direction of the slider. The fixed base is mounted on one of the inner arm and the outer arm, and the end of the slider extending out of the fixed base is used to contact the other of the inner arm and the outer arm.

[0008] In some embodiments, the fixed base is a groove-shaped structure, the groove sidewall of the groove-shaped structure serves as the sliding track, and the elastic element is located between the slider and the bottom wall of the groove-shaped structure.

[0009] In some embodiments, the wear-resistant mechanism further includes an adjusting rod and a rod nut, the elastic element being a butterfly spring, the butterfly spring being sleeved on the adjusting rod, one end of the adjusting rod being limited by the butterfly spring, and the other end of the adjusting rod extending out of the fixed seat and threadedly engaging with the rod nut.

[0010] In some embodiments, the end of the slider that extends into the fixed base is provided with a guide block, and the guide block is nested and engaged with the groove structure.

[0011] In some embodiments, the inner peripheral wall of the fixing seat is provided with a wear-resistant layer.

[0012] In some embodiments, the number of anti-wear mechanisms is multiple and divided into two groups. One group of anti-wear mechanisms is arranged and installed on the outer arm relative to the open end of the outer arm, and the other group of anti-wear mechanisms is arranged and installed on the inner arm relative to the end of the inner arm that extends into the outer arm.

[0013] In some embodiments, the inner peripheral wall of the outer arm is provided with a positioning sensor, which is used to detect the distance between itself and the outer peripheral wall of the inner arm.

[0014] In some embodiments, the outer peripheral wall of the inner arm is provided with a positioning sensor, which is used to detect the distance between itself and the inner peripheral wall of the outer arm.

[0015] A specific embodiment of this application also provides a fire truck with a boom lift, including the telescopic boom device described above.

[0016] Through the above technical solution, the aerial demolition fire truck and its telescopic boom device of this application have the following beneficial effects: The telescopic boom device of this application designs the demolition boom as a telescopic structure with nested inner and outer boom sections, and is equipped with a dedicated telescopic drive mechanism to drive the inner boom section to extend and retract relative to the outer boom section. This replaces the traditional fixed-length demolition boom structure. It eliminates the need to change the working range by simply adjusting the angle of the base boom. The working length can be flexibly adjusted directly by telescopically extending the demolition boom, which greatly improves the mobility of the aerial demolition fire truck when operating in confined spaces. It effectively avoids the problem of the boom interfering with obstacles due to insufficient angle adjustment precision, thereby improving the performance of the aerial demolition fire truck in complex working conditions.

[0017] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings: Figure 1 This is a structural schematic diagram of a fire truck with a boom lift and demolition system according to a specific embodiment of this application; Figure 2 This is a structural schematic diagram of the telescopic boom device according to a specific embodiment of this application; Figure 3 This is a schematic diagram of the anti-wear mechanism according to a specific embodiment of this application.

[0019] Explanation of reference numerals in the attached figures 100. Aerial Lifting and Demolition Fire Truck; 10. Telescopic Boom Device; 20. Vehicle Body; 30. Demolition Tools; 1. Base Boom; 2. Demolition Boom; 21. Inner Boom Section; 22. Outer Boom Section; 23. Telescopic Drive Mechanism; 3. Wear-resistant Mechanism; 31. Fixed Seat; 32. Sliding Block; 33. Butterfly Spring; 34. Adjusting Rod; 35. Rod Nut; 36. Guide Block; 37. Wear-resistant Layer; 38. Position Sensor. Detailed Implementation

[0020] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0021] The terminology of the aerial demolition fire truck and its telescopic boom device according to this application is described below with reference to the accompanying drawings.

[0022] like Figure 1 and Figure 2 As shown, a specific embodiment of this application provides a telescopic boom device 10 for a fire truck 100 with elevated demolition capabilities, comprising: The base boom 1 is used to connect to the body 20 of the aerial demolition fire truck 100; The demolition arm 2 includes an inner arm 21, an outer arm 22, and a telescopic drive mechanism 23. The inner arm 21 is movably sleeved inside the outer arm 22. The end of the inner arm 21 that extends into the outer arm 22 is connected to the outer arm 22 through the telescopic drive mechanism 23. The end of the inner arm 21 that extends out of the outer arm 22 is provided with a demolition tool 30. The outer arm 22 is hinged to the base arm 1.

[0023] Specifically, one end of the base boom 1 is fixedly connected to the vehicle body 20 of the aerial demolition fire truck 100, providing an installation support base for the entire telescopic boom device 10 and serving as the connection hub between the telescopic boom device 10 and the vehicle body 20; one end of the outer boom 22 is hinged to the end of the base boom 1 away from the vehicle body 20, allowing the demolition boom 2 to be angled relative to the base boom 1 to adapt to the angle requirements of different high-altitude operation positions; the inner boom 21 is movably sleeved inside the outer boom 22, forming a nested telescopic cooperation structure. The telescopic drive mechanism 23 is connected at both ends to the end of the inner arm 21 that extends into the outer arm 22 and the inner wall of the outer arm 22, respectively. The telescopic drive mechanism 23 can perform telescopic movements and directly drive the inner arm 21 to extend and retract axially relative to the outer arm 22, thereby adjusting the overall length of the demolition arm 2. A demolition tool 30 is fixedly installed at the end of the inner arm 21 that extends out of the outer arm 22. The demolition tool 30 can be a commonly used fire demolition tool such as a hydraulic breaker or hydraulic shears, which can directly complete the demolition of high-altitude buildings and the removal of obstacles.

[0024] With this configuration, the demolition boom 2 is designed as a nested telescopic structure of inner boom 21 and outer boom 22. The inner boom 21 is directly driven to extend and retract through the telescopic drive mechanism 23, which replaces the traditional fixed-length demolition boom 2 structure. It eliminates the need to change the working range by adjusting the angle of the base boom 1. The working length of the demolition boom 2 can be directly and flexibly adjusted, thereby improving the mobility of the aerial demolition fire truck 100 in confined spaces.

[0025] In some embodiments, an anti-wear mechanism 3 is provided between the outer arm 22 and the inner arm 21.

[0026] With this design, the anti-wear mechanism 3 effectively avoids direct contact between the inner arm 21 and the outer arm 22, fundamentally preventing metal wear and structural scratches caused by direct extension and retraction friction, reducing structural damage, and thus extending the service life of the inner and outer arms 22. At the same time, the anti-wear mechanism 3 can reduce the extension and retraction friction resistance between the inner and outer arms 22, making the extension and retraction of the inner arm 21 smoother and improving the flexibility and accuracy of the length adjustment of the demolition arm 2.

[0027] like Figure 3 As shown, in some embodiments, the anti-wear mechanism 3 includes a fixed base 31, a slider 32, and an elastic element. A sliding track is formed in the fixed base 31, and the slider 32 is movably engaged with the sliding track. The elastic element connects the slider 32 and the fixed base 31 and extends and retracts along the sliding direction of the slider 32. The fixed base 31 is mounted on one of the inner arm 21 and the outer arm 22, and the end of the slider 32 extending out of the fixed base 31 is used to contact the other of the inner arm 21 and the outer arm 22.

[0028] Specifically, the sliding track extends along the interval between the inner arm 21 and the outer arm 22, and the anti-wear mechanism 3 can be selectively installed on one of the inner arm 21 and the outer arm 22.

[0029] With this configuration, the slider 32 moves radially along the outer arm 22 via a sliding track. Combined with the elastic support of the elastic element, the slider 32 can adaptively adjust its contact position according to the distance between the outer peripheral wall of the inner arm 21 and the inner peripheral wall of the outer arm 22, ensuring sufficient contact between the slider 32 and the inner arm 21. This avoids the problem of insufficient contact between the traditional fixed slider 32 and the boom. The elastic characteristics of the elastic element can buffer the impact load transmitted to the slider 32 during demolition operations, transforming rigid collisions into elastic contact, reducing structural damage to the slider 32 and the inner arm 21 caused by the impact load. At the same time, it can offset the fit gap between the inner and outer arms 22, improve the overall connection rigidity of the boom, and further alleviate the vibration problem of the telescopic boom device 10.

[0030] In some embodiments, the fixed base 31 is a groove-shaped structure, the groove sidewall of the groove-shaped structure serves as a sliding track, and the elastic element is located between the slider 32 and the bottom wall of the groove-shaped structure.

[0031] With this design, the fixed base 31 is designed as a groove structure, and its groove sidewall directly forms a sliding track. There is no need to set up an additional track assembly, which simplifies the overall structure of the anti-wear mechanism 3 and reduces the processing and installation difficulty of the mechanism. The elastic element is set between the slider 32 and the bottom wall of the groove. At the same time, the groove structure can limit the extension and contraction of the elastic element on both sides, so that the supporting force of the elastic element can be directly applied to the slider 32 radially. The force transmission is more direct and efficient, ensuring the elastic support effect of the slider 32 on the inner arm 21.

[0032] In some embodiments, the anti-wear mechanism 3 further includes an adjusting rod 34 and a rod nut 35. The elastic element is a butterfly spring 33, which is sleeved on the adjusting rod 34 and engages with the butterfly spring 33 for limiting. The other end of the adjusting rod 34 extends out of the fixed seat 31 and engages with the rod nut 35 by thread.

[0033] Specifically, the adjusting rod 34 includes a large-diameter section and a small-diameter section. The step structure between the large-diameter section and the small-diameter section limits the movement of the disc spring 33, allowing the compression of the disc spring 33 to be adjusted by pushing and pulling the adjusting rod 34. To enable the slider 32 to contact the disc spring 33, a clearance structure needs to be provided on the slider 32 to allow the adjusting rod 34 to be inserted.

[0034] This design utilizes the characteristics of the disc spring 33—small deformation to bear large loads and small space occupation—to provide strong and stable elastic support for the slider 32 within the limited internal space of the fixed seat, adapting to the large impact load requirements of the demolition tool 30 during operation. The threaded engagement structure between the adjusting rod 34 and the rod nut 35 allows for flexible adjustment of the compression of the disc spring 33 by pushing and pulling the adjusting rod 34, thereby adjusting the supporting force of the slider 32 on the inner arm 21. This allows for compression of the disc spring 33 during the assembly of the telescopic boom device 10 to leave an assembly gap and avoid assembly interference, and for releasing the compression after assembly to ensure a tight fit between the slider 32 and the inner arm 21, eliminating the fit gap. At the same time, the supporting force can be flexibly adjusted according to the load size of different demolition conditions, improving the adaptability of the wear-resistant mechanism 3 to different working conditions.

[0035] In some embodiments, the end of the slider 32 that extends into the fixed base 31 is provided with a guide block 36, which is nested with the groove structure.

[0036] This configuration, with the guide block 36 nested with the groove structure, further improves the matching accuracy between the slider 32 and the sliding track, providing all-round limiting guidance for the movement of the slider 32. This effectively prevents the slider 32 from tilting or shifting when subjected to eccentric load, ensuring that the slider 32 always moves in a straight line along the radial direction of the outer arm 22. At the same time, the direct contact between the guide block 36 and the fixed seat avoids the contact pressure between the slider 32 and the fixed seat, thereby reducing local wear on the slider 32 and extending the overall service life of the wear-resistant mechanism 3.

[0037] Similarly, in order for the guide block 36 to contact the disc spring 33, a clearance structure needs to be provided on the guide block 36 so that the adjusting rod 34 can be inserted. By providing the guide block 36, it is not necessary to provide a clearance structure on the slider 32.

[0038] In some embodiments, a wear-resistant layer 37 is provided on the inner peripheral wall of the fixing seat 31.

[0039] With this configuration, the wear-resistant layer 37 on the inner peripheral wall of the fixed seat 31 can effectively reduce the friction and wear between the guide block 36 and the fixed seat 31, avoid structural deformation and wear of the fixed seat 31 due to long-term friction, and extend the service life of the fixed seat 31; at the same time, the wear-resistant layer 37 can reduce the frictional resistance between the guide block 36 and the fixed seat 31, making the radial movement of the slider 32 smoother, reducing the jamming problem during the movement, and improving the working stability of the anti-wear mechanism 3.

[0040] In some embodiments, the number of anti-wear mechanisms 3 is multiple and divided into two groups. One group of anti-wear mechanisms 3 is arranged and installed on the outer arm 22 relative to the open end of the outer arm 22, and the other group of anti-wear mechanisms 3 is arranged and installed on the inner arm 21 relative to the end of the inner arm 21 that extends into the outer arm 22.

[0041] Specifically, a set of anti-wear mechanisms 3 installed on the outer boom 22 includes multiple anti-wear mechanisms 3 evenly distributed along the axial and circumferential directions of the outer boom 22. These mechanisms can provide elastic support and anti-wear protection for the inner boom 21 from multiple positions. Similarly, a set of anti-wear mechanisms 3 installed on the inner boom 21 includes multiple anti-wear mechanisms 3 evenly distributed along the axial and circumferential directions of the inner boom 21. These mechanisms can provide elastic support and anti-wear protection for the outer boom 22 from multiple positions, ensuring that the inner boom 21 is subjected to uniform force within the outer boom 22. This prevents the inner boom 21 or outer boom 22 from becoming misaligned due to uneven force on one side, which could lead to telescopic jamming or increased local wear. At the same time, the multi-position support can further enhance the fit rigidity between the inner boom 21 and the outer boom 22, better offset the fit gap, alleviate boom vibration during demolition operations, and improve the structural stability of the entire telescopic boom device 10.

[0042] In some embodiments, the inner peripheral wall of the outer arm 22 is provided with a positioning sensor 38, which is used to detect the distance between the outer peripheral wall of the inner arm 21 and the inner peripheral wall of the inner arm 22; and / or, the outer peripheral wall of the inner arm 21 is provided with a positioning sensor 38, which is used to detect the distance between the outer peripheral wall of the inner arm 22 and the inner peripheral wall of the outer arm 22.

[0043] Specifically, the positioning sensor 38 can monitor the change in the fit clearance between the inner boom 21 and the outer boom 22 in real time. When the anti-wear mechanism 3 experiences abnormal conditions such as wear of the slider 32 or fatigue failure of the elastic element, the inner boom 21 will deviate, and the distance between it and the positioning sensor 38 will change abnormally. The positioning sensor 38 can capture the abnormal signal in time and provide feedback, thereby realizing real-time monitoring of the boom fit status and improving the working safety and intelligence level of the telescopic boom device 10.

[0044] Furthermore, the positioning sensor 38 is positioned adjacent to the anti-wear mechanism 3 to detect any abnormalities that may occur in the anti-wear mechanism 3 more quickly and accurately.

[0045] The wear-resistant mechanism 3 installed on the outer arm 22 is arranged in a group with the position sensor 38 installed on the inner peripheral wall of the outer arm 22, and the wear-resistant mechanism 3 installed on the inner arm 21 is arranged in a group with the position sensor 38 installed on the outer peripheral wall of the inner arm 21.

[0046] It should be noted that the structure and principle of the positioning sensor 38 are well known to those skilled in the art and are not part of the core inventive point of this application, so they will not be described in detail here.

[0047] In this application, the telescopic drive mechanism 23 can be a hydraulic cylinder, an electric push rod, etc., and the demolition tool 30 can be flexibly replaced according to actual operation needs. An angle locking component is provided at the hinge joint between the base arm 1 and the outer arm 22, which can be locked and fixed after the demolition arm 2 is adjusted to the target angle to ensure the structural stability during operation.

[0048] A specific embodiment of this application also provides a high-lift demolition fire truck 100, including the telescopic boom device 10 as described above. Since the high-lift demolition fire truck 100 employs all embodiments of the telescopic boom device 10 described above, it possesses all the beneficial effects of the aforementioned embodiments.

[0049] The telescopic boom device 10 of this application provides a more flexible adjustment method for demolition operations in the aerial demolition fire truck 100. Through the extension and retraction of the demolition boom 2, angle adjustment, and overall boom rotation, precise operations in confined spaces and complex conditions can be achieved, significantly improving the operational adaptability of the aerial demolition fire truck 100. Specifically, the impact resistance, stability, and wear resistance of the telescopic boom device 10 are greatly improved, reducing the vehicle's failure rate, extending the service life of the boom system, and lowering equipment maintenance costs. The real-time monitoring function of the positioning sensor 38 enables intelligent monitoring of the boom status, allowing for timely detection and warning of equipment anomalies, preventing the escalation of faults, and improving the safety and reliability of the aerial demolition fire truck 100's high-altitude operations. This enables the aerial demolition fire truck 100 to complete high-rise building firefighting, rescue, and demolition operations more efficiently and safely, strengthening its emergency rescue capabilities.

[0050] In this application, unless otherwise stated, directional terms such as "center," "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of this application and simplifying the description, and do not 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 limitations on the embodiments of this application. The directional terms "inner" and "outer" refer to the inside and outside of the outline of each component itself.

[0051] In the description of this application, it should be understood that the terms "first" and "second" 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 as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0054] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A telescopic boom device for a fire truck with elevated demolition capabilities, characterized in that, include: The base boom (1) is used to connect to the body (20) of the aerial demolition fire truck (100); The demolition arm (2) includes an inner arm (21), an outer arm (22), and a telescopic drive mechanism (23). The inner arm (21) is movably sleeved inside the outer arm (22). The end of the inner arm (21) extending into the outer arm (22) is connected to the outer arm (22) through the telescopic drive mechanism (23). The end of the inner arm (21) extending out of the outer arm (22) is provided with a demolition tool (30). The outer arm (22) is hinged to the base arm (1).

2. The telescopic boom device according to claim 1, characterized in that, A wear-resistant mechanism (3) is provided between the outer arm (22) and the inner arm (21).

3. The telescopic boom device according to claim 2, characterized in that, The wear-resistant mechanism (3) includes a fixed base (31), a slider (32), and an elastic element. A sliding track is formed inside the fixed base (31). The slider (32) is movably engaged with the sliding track. The elastic element connects the slider (32) and the fixed base (31) and extends and retracts along the sliding direction of the slider (32). The fixed base (31) is mounted on one of the inner arm (21) and the outer arm (22). The slider (32) extends out of the end of the fixed base (31) to contact the other of the inner arm (21) and the outer arm (22).

4. The telescopic boom device according to claim 3, characterized in that, The fixed base (31) is a groove-shaped structure, the groove sidewall of the groove-shaped structure serves as the sliding track, and the elastic element is located between the slider (32) and the bottom wall of the groove-shaped structure.

5. The telescopic boom device according to claim 4, characterized in that, The wear-resistant mechanism (3) further includes an adjusting rod (34) and a rod nut (35). The elastic element is a butterfly spring (33). The butterfly spring (33) is sleeved on the adjusting rod (34). One end of the adjusting rod (34) is limited to the butterfly spring (33), and the other end of the adjusting rod (34) extends out of the fixed seat (31) and is threaded to the rod nut (35).

6. The telescopic boom device according to claim 4, characterized in that, The end of the slider (32) that extends into the fixed base (31) is provided with a guide block (36), and the guide block (36) is nested and cooperates with the groove structure.

7. The telescopic boom device according to claim 3, characterized in that, The inner peripheral wall of the fixed seat (31) is provided with a wear-resistant layer (37).

8. The telescopic boom device according to claim 2, characterized in that, The number of anti-wear mechanisms (3) is multiple and divided into two groups. One group of anti-wear mechanisms (3) is arranged and installed on the outer arm (22) relatively close to the open end of the outer arm (22). The other group of anti-wear mechanisms (3) is arranged and installed on the inner arm (21) relatively close to the end of the inner arm (21) that extends into the outer arm (22).

9. The telescopic boom device according to claim 1, characterized in that, The inner peripheral wall of the outer arm (22) is provided with a positioning sensor (38), which is used to detect the distance between itself and the outer peripheral wall of the inner arm (21). And / or, the outer peripheral wall of the inner arm (21) is provided with a positioning sensor (38), which is used to detect the distance between the inner peripheral wall of the outer arm (22).

10. A fire truck with elevated demolition capabilities, characterized in that, Includes the telescopic boom device (10) according to any one of claims 1 to 9.

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