Straight arm telescopic boom of fire fighting truck and limiting device of straight arm telescopic boom

Abstract

The utility model discloses a fire fighting truck straight arm telescopic boom and a limiting device thereof, which comprise a fire fighting truck main body, a main telescopic boom, a telescopic boom limiting mechanism, a boom telescopic mechanism and a buffer protection mechanism, the fire fighting truck main body is hinged and rotatably provided with the main telescopic boom, and one end in the main telescopic boom is telescopically and slidably provided with a first inner telescopic boom; a second inner telescopic arm is arranged in the first inner telescopic arm in a telescopic sliding mode, a segmented lug plate is fixedly arranged at one end of the main telescopic arm, one end of the first inner telescopic arm and one end of the second inner telescopic arm in a matched mode, an I-shaped telescopic rod is fixedly arranged on the outer side of one end of the segmented lug plate in a matched mode, and an electromagnet is fixedly arranged at the telescopic end of the I-shaped telescopic rod in a matched mode. Supporting blocks are fixedly arranged on the inner side of one end of the segmented lug plate in a vertically symmetrical mode, an arm frame telescopic mechanism is arranged in the main telescopic arm, and a buffering protection mechanism is arranged in the main telescopic arm. Adsorption clamping is achieved through power-on and power-off of the electromagnet, clamping limiting is carried out according to the requirements when the extension lengths are different, and the buffering effect is achieved through the first buffering spring and the second buffering spring.

Description

Technical Field

[0001] This utility model relates to the field of fire-fighting equipment technology, and in particular to a fire truck straight telescopic boom and its limiting device. Background Technology

[0002] Fire truck telescopic booms are typically composed of multiple sections with different cross-sectional areas, such as the first telescopic boom section, the second telescopic boom section, and the third telescopic boom section. These sections are interlocked to achieve the telescopic function. They are generally made of high-strength metal materials, such as aluminum alloy or high-strength steel, to ensure the strength and stability of the boom during extension and load-bearing. The telescopic boom is controlled by a hydraulic system that controls the movement of the telescopic cylinder. When hydraulic oil enters the rodless chamber of the cylinder, the cylinder rod extends, pushing the connected telescopic boom section outward to extend the boom. Conversely, when hydraulic oil enters the rod chamber of the cylinder, the cylinder rod retracts, causing the telescopic boom section to retract inward to shorten the boom.

[0003] The utility model application with application number 202420417418.1 discloses a telescopic boom device and a fire truck. The cylinder is connected to the second telescopic boom section by one end near the telescopic rod and to the sprocket assembly by the other end. One end of the chain is connected to the telescopic rod, and the other end is wound around the sprocket assembly and connected to the third telescopic boom section. It can be understood that the telescopic boom device provided by this utility model has a high degree of integration. The chain and sprocket assembly are set on the cylinder, which makes full use of the internal space of the boom and reduces the distance between it and the second telescopic boom section, thereby reducing the boom section of the second telescopic boom section and reducing the self-weight of the boom section. At the same time, it also simplifies the assembly process and technology of the telescopic boom device and improves the assembly efficiency. In addition, since the chain is hidden in the middle of the boom, it avoids rusting and aging caused by wind and sun exposure.

[0004] However, the aforementioned telescopic boom device and the method of controlling the telescopic boom extension and retraction using a sprocket assembly in fire trucks are inconvenient to effectively limit the telescopic boom after it has been extended to a specified length, which can easily lead to slippage of the telescopic boom after it has been extended. In the aforementioned telescopic boom device and fire truck, when the chain breaks, the chain breakage signal can only be obtained by the detection component, and it is impossible to protect and buffer the slipped telescopic boom. Therefore, this utility model proposes a straight telescopic boom for fire trucks and its limiting device to solve the problems existing in the prior art. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this utility model is to propose a fire truck telescopic boom and its limiting device. This fire truck telescopic boom and its limiting device utilize an electromagnet to achieve the extension and adsorption clamping of the first and second inner telescopic booms, allowing for clamping and limiting at different extension lengths as needed. A motor drives the main screw to rotate, engaging the first and second hollow threaded tubes to rotate and lift them up, while the threads also act as a limiting mechanism. A first and second buffer spring respectively buffer the first and second inner telescopic booms, effectively preventing slippage and collision damage in case of malfunction.

[0006] To achieve the purpose of this utility model, the utility model is implemented through the following technical solution: a fire truck telescopic boom and its limiting device, including a fire truck body, a main telescopic boom, a telescopic boom limiting mechanism, a boom telescopic mechanism and a buffer protection mechanism, wherein the main telescopic boom is hinged and rotatably provided on the fire truck body, the telescopic boom limiting mechanism includes a first inner telescopic boom, a second inner telescopic boom, segmented ear plates, an I-beam telescopic rod, an electromagnet and a support block, the first inner telescopic boom is telescopically slidably provided at one end of the main telescopic boom, the second inner telescopic boom is telescopically slidably provided inside the first inner telescopic boom, the segmented ear plates are fixedly provided at one end of the main telescopic boom, the first inner telescopic boom and the second inner telescopic boom, the I-beam telescopic rod is fixedly provided on the outer side of one end of the segmented ear plates, the electromagnet is fixedly provided at the telescopic end of the I-beam telescopic rod, the support blocks are symmetrically fixedly provided on the inner side of one end of the segmented ear plates, the boom telescopic mechanism is provided inside the main telescopic boom (2), and the buffer protection mechanism is provided inside the main telescopic boom (2).

[0007] A further improvement is that the support block is fitted and supported against the telescopic end of the I-beam telescopic rod, and the electromagnet is close to the outer side of the first inner telescopic arm and the second inner telescopic arm, respectively.

[0008] A further improvement is that: guide blocks are symmetrically fixed on the outer sides of the other ends of the first and second inner telescopic arms, and guide grooves are symmetrically opened on the inner walls of the main telescopic arm and the first inner telescopic arm, and the guide blocks slide along the guide grooves.

[0009] A further improvement is that the boom telescopic mechanism includes a motor, a main screw, a first hollow threaded tube, and a second hollow threaded tube. The other end of the main telescopic boom is externally fixed with a motor, and the output end of the motor drives the main screw. The main screw is externally threaded with the first hollow threaded tube, and the first hollow threaded tube is externally threaded with the second hollow threaded tube.

[0010] A further improvement is that the first hollow threaded tube is provided with threads on both the inside and outside, and the second hollow threaded tube is provided with threads on the inside.

[0011] A further improvement is that the buffer protection mechanism includes a first buffer spring, a fixed plate and a second buffer spring, and the first buffer spring is fixedly arranged around the other end of the main telescopic arm. The fixed plate is fixedly arranged around the other end of the first inner telescopic arm, and the second buffer spring is fixedly arranged around one side of the fixed plate.

[0012] A further improvement is that a hinged seat is fixedly provided on one side of the main telescopic boom, and a lifting hydraulic cylinder is hinged to the main body of the fire truck, with the telescopic end of the lifting hydraulic cylinder hinged to the hinged seat.

[0013] The beneficial effects of this utility model are as follows: This utility model achieves the extension and adsorption clamping of the first and second inner telescopic arms by energizing and de-energizing the electromagnet, and realizes clamping and limiting at different extension lengths as needed. The main screw driven by the motor rotates and the threaded engagement drives the first and second hollow threaded tubes to rotate and lift up, while the threaded engagement acts as a limiting function. The first and second buffer springs respectively provide a buffering effect on the first and second inner telescopic arms, effectively preventing them from sliding down and causing collision damage in case of failure. Attached Figure Description

[0014] Figure 1 This is the overall front view of the present invention;

[0015] Figure 2 This is a front sectional view of the main telescopic arm of this utility model;

[0016] Figure 3 This is an enlarged schematic diagram of point A of this utility model.

[0017] The components include: 1. Fire truck body; 2. Main telescopic boom; 3. First inner telescopic boom; 4. Second inner telescopic boom; 5. Segmented ear plate; 6. I-beam telescopic rod; 7. Electromagnet; 8. Support block; 9. Guide block; 10. Guide groove; 11. Motor; 12. Main screw; 13. First hollow threaded tube; 14. Second hollow threaded tube; 15. First buffer spring; 16. Fixing plate; 17. Second buffer spring; 18. Hinge seat; 19. Lifting hydraulic cylinder. Detailed Implementation

[0018] To deepen the understanding of this utility model, the following detailed description will be provided in conjunction with embodiments. These embodiments are only used to explain this utility model and do not constitute a limitation on the scope of protection of this utility model.

[0019] according to Figure 1 , Figure 2 , Figure 3As shown, this embodiment provides a fire truck telescopic boom and its limiting device, including a fire truck body 1, a main telescopic boom 2, a telescopic boom limiting mechanism, a boom telescopic mechanism, and a buffer protection mechanism. The main telescopic boom 2 is hinged and rotatably mounted on the fire truck body 1. The telescopic boom limiting mechanism includes a first inner telescopic boom 3, a second inner telescopic boom 4, segmented ear plates 5, an I-beam telescopic rod 6, an electromagnet 7, and a support block 8. The first inner telescopic boom 3 is telescopically slidably mounted at one end of the main telescopic boom 2, and the second inner telescopic boom 4 is telescopically slidably mounted inside the first inner telescopic boom 3. A segmented ear plate 5 is fixedly mounted at one end of the main telescopic boom 2, the first inner telescopic boom 3, and the second inner telescopic boom 4. A segmented ear plate 5 is fixedly mounted on the outer side of one end of the segmented ear plate 5. The telescopic boom has an I-beam telescopic rod 6, with an electromagnet 7 fixedly installed at the telescopic end of the I-beam telescopic rod 6. Support blocks 8 are symmetrically fixed on the inner side of one end of the segmented ear plate 5. When the telescopic boom is working, the first inner telescopic arm 3 and the second inner telescopic arm 4 slide out from the main telescopic arm 2. When it is necessary to limit the movement, the electromagnet 7 is energized to generate magnetism and is attracted to the outside of the first inner telescopic arm 3 and the second inner telescopic arm 4 respectively. At the same time, the I-beam telescopic rod 6 is extended and supported by the support block 8. It is convenient to be energized and attracted and clamped as needed, which solves the problem of clamping at different extension lengths to prevent the telescopic arm from slipping after extension. The main telescopic arm 2 is equipped with a boom telescopic mechanism and a buffer protection mechanism.

[0020] The support block 8 is attached to the telescopic end of the I-beam telescopic rod 6 for support, and the electromagnet 7 is attached to the outer side of the first inner telescopic arm 3 and the second inner telescopic arm 4 respectively, so as to facilitate the electromagnet 7 to be energized and clamped.

[0021] Guide blocks 9 are symmetrically fixed on the outer sides of the other end of the first inner telescopic arm 3 and the second inner telescopic arm 4. Guide grooves 10 are symmetrically opened on the inner walls of the main telescopic arm 2 and the first inner telescopic arm 3. The guide blocks 9 slide along the guide grooves 10. When the first inner telescopic arm 3 and the second inner telescopic arm 4 slide and extend, the guide blocks 9 and the guide grooves 10 slide together to maintain sliding stability.

[0022] The boom telescopic mechanism includes a motor 11, a main screw 12, a first hollow threaded tube 13, and a second hollow threaded tube 14. The motor 11 is fixedly mounted on the other end of the main telescopic boom 2. The output end of the motor 11 drives the main screw 12. The first hollow threaded tube 13 is threaded on the outside of the main screw 12. The second hollow threaded tube 14 is threaded on the outside of the first hollow threaded tube 13. The first hollow threaded tube 13 has threads on both its inner and outer sides. The second hollow threaded tube 14 has threads on its inner side. When the telescopic adjustment is performed, the motor 11 drives the main screw 12 to rotate. The threaded engagement drives the first hollow threaded tube 13 and the second hollow threaded tube 14 to rotate, thereby pushing the first inner telescopic boom 3 and the second inner telescopic boom 4 to slide out.

[0023] The buffer protection mechanism includes a first buffer spring 15, a fixed plate 16, and a second buffer spring 17. The first buffer spring 15 is fixedly arranged around the other end of the main telescopic arm 2, and the fixed plate 16 is fixedly arranged around the other end of the first inner telescopic arm 3. The second buffer spring 17 is fixedly arranged around one side of the fixed plate 16. When the telescopic arm malfunctions and retracts downward, the first buffer spring 15 and the second buffer spring 17 respectively activate the buffering effect on the first inner telescopic arm 3 and the second inner telescopic arm 4, effectively preventing collision and damage when the first inner telescopic arm 3 and the second inner telescopic arm 4 malfunction and slide downward.

[0024] A hinge seat 18 is fixedly installed on one side of the main telescopic boom 2. A lifting hydraulic cylinder 19 is hinged on the main body 1 of the fire truck. The extension end of the lifting hydraulic cylinder 19 is hinged to the hinge seat 18. When the main telescopic boom 2 needs to be lifted, the lifting hydraulic cylinder 19 extends out of the hinge and pushes one end of the main telescopic boom 2 to rotate and lift.

[0025] When the fire truck's telescopic boom and its limiting device are in operation, the hydraulic telescopic cylinder extends and hinges to lift the main telescopic boom. During telescopic movement, the motor drives the main screw to rotate, which in turn drives the first hollow threaded tube to rotate, and then the threaded tube drives the second hollow threaded tube to rotate, thus pushing the first and second inner telescopic arms to extend from the main telescopic boom and rise. When they rise to the designated height, the electromagnet is energized and adsorbs onto the outside of the first and second inner telescopic arms respectively, simultaneously driving the I-beam telescopic rod to extend, and the telescopic end is supported by the support block. When the telescopic boom malfunctions, the threads on the main screw, the first hollow threaded tube, and the second hollow threaded tube provide a certain buffering effect. Then, the first buffer spring and the second buffer spring respectively buffer the first and second inner telescopic arms to prevent collision damage.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A straight arm telescopic boom for a fire truck and a limiting device thereof, characterized in that: The utility model provides a fire engine, including fire engine body (1), main telescopic arm (2), telescopic arm limiting mechanism, arm support telescopic mechanism and buffer protection mechanism, the main telescopic arm (2) is hingedly rotated and is equipped with on fire engine body (1), telescopic arm limiting mechanism includes first inner telescopic arm (3), second inner telescopic arm (4), segmented lug (5), I -beam telescopic rod (6), electromagnet (7) and support block (8), the first inner telescopic arm (3) is equipped with in the telescopic sliding of one end of main telescopic arm (2), the second inner telescopic arm (4) is equipped with in the telescopic sliding of first inner telescopic arm (3), the one end of main telescopic arm (2), first inner telescopic arm (3) and second inner telescopic arm (4) is fixed with segmented lug (5) in a matched manner, the segmented lug (5) one end outside is fixed with I -beam telescopic rod (6) in a matched manner, the I -beam telescopic rod (6) telescopic end is fixed with electromagnet (7) in a matched manner, the segmented lug (5) one end inside is fixed with support block (8) on the upper and lower symmetry, the main telescopic arm (2) is equipped with arm support telescopic mechanism, and the main telescopic arm (2) is equipped with buffer protection mechanism.

2. The straight arm telescopic boom of a fire fighting truck and its limiting device according to claim 1, characterized in that: The support block (8) is supported with the telescopic end of I -beam telescopic rod (6), and the electromagnet (7) is close to the outer side of the first inner telescopic arm (3) and the second inner telescopic arm respectively.

3. The straight arm telescopic boom of a fire fighting truck and its limiting device according to claim 1, characterized in that: The other end of the first inner telescopic arm (3) and the second inner telescopic arm (4) is fixed with the guide block (9) on the upper and lower symmetry, and the main telescopic arm (2) and the first inner telescopic arm (3) are symmetrically provided with the guide sliding groove (10) on the inner wall, and the guide block (9) slides along the guide sliding groove (10).

4. The straight arm telescopic boom of a fire fighting truck and its limiting device according to claim 1, characterized in that: The arm support telescopic mechanism includes a motor (11), a main screw rod (12), a first hollow threaded tube (13) and a second hollow threaded tube (14), the other end of the main telescopic arm (2) is fixedly provided with the motor (11), the output end of the motor (11) is driven to be provided with the main screw rod (12), the main screw rod (12) is externally threaded and matched with the first hollow threaded tube (13), and the first hollow threaded tube (13) is externally threaded and matched with the second hollow threaded tube (14).

5. The straight arm telescopic boom of a fire fighting truck and its limiting device according to claim 4, characterized in that: The first hollow threaded tube (13) is internally and externally matched with threads, and the second hollow threaded tube (14) is internally provided with threads.

6. The straight arm telescopic boom of a fire fighting truck and its limiting device according to claim 1, characterized in that: The buffer protection mechanism includes a first buffer spring (15), a fixed plate (16) and a second buffer spring (17), the first buffer spring (15) is fixedly arranged around the other end in the main telescopic arm (2), the fixed plate (16) is fixedly arranged in the other end in the first inner telescopic arm (3), and the second buffer spring (17) is fixedly arranged around one side of the fixed plate (16).

7. The straight arm telescopic boom of a fire fighting truck and its limiting device according to claim 1, characterized in that: The main telescopic arm (2) is fixedly provided with a hinged seat (18) on one side below, the fire engine body (1) is hingedly provided with a lifting hydraulic cylinder (19), and the telescopic end of the lifting hydraulic cylinder (19) is hingedly connected with the hinged seat (18).

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