An automatic retraction and deployment device for the auxiliary ladder of a ladder truck.

Abstract

This utility model relates to the field of aerial ladder truck technology and discloses an automatic retraction and deployment device for an auxiliary ladder of an aerial ladder truck, comprising: a fixed arm for connecting to the main body of the aerial ladder truck; an auxiliary ladder slidably mounted on the fixed arm; a drive assembly disposed between the fixed arm and the auxiliary ladder, the drive assembly including a rack, a gear, and a hydraulic motor, the rack being fixedly connected to both sides of the auxiliary ladder, the gear being installed inside the fixed arm and meshing with the rack, the hydraulic motor being fixedly connected to the fixed arm and its output end being connected to the gear transmission; and a locking assembly disposed on the fixed arm for fixing the fixed arm and the auxiliary ladder relative to each other. This utility model solves the problems of existing grounding auxiliary ladders mostly using manual retraction and deployment methods, which are cumbersome to operate, inefficient, and lack a reliable locking structure.

Description

Technical Field

[0001] This utility model relates to the field of aerial ladder truck technology, specifically an automatic deployment and retraction device for the auxiliary ladder of an aerial ladder truck. Background Technology

[0002] Aerial ladder trucks are commonly used equipment in scenarios such as fire fighting and high-altitude operations. Among them, the grounding auxiliary ladder is a key connecting component between the end of the aerial ladder truck and the ground. When the main body of the aerial ladder is deployed and there is a height difference between the end and the ground, the grounding auxiliary ladder can fill this gap. After the grounding auxiliary ladder touches the ground, it will add a ground support point, which can significantly reduce the swing amplitude of the end of the aerial ladder and improve the operational stability of the entire aerial ladder structure.

[0003] Most grounding auxiliary ladders on the market currently use a manual retraction method, which is cumbersome, inefficient, and lacks a reliable locking structure. Safety hazards such as position displacement and shaking can easily occur during the retraction process. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an automatic retraction and deployment device for the auxiliary ladder of a ladder truck, which solves the problems of existing grounding auxiliary ladders mostly using manual retraction and deployment methods, which are cumbersome to operate, inefficient, and lack a reliable locking structure.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an automatic retraction and deployment device for an auxiliary ladder of a ladder truck, comprising: a fixed arm for connecting to the main body of the ladder truck; an auxiliary ladder slidably mounted on the fixed arm; a drive assembly disposed between the fixed arm and the auxiliary ladder, the drive assembly including a rack, a gear and a hydraulic motor, the rack being fixedly connected to both sides of the auxiliary ladder, the gear being installed inside the fixed arm and meshing with the rack, the hydraulic motor being fixedly connected to the fixed arm and its output end being connected to the gear drive; and a locking assembly disposed on the fixed arm for fixing the fixed arm and the auxiliary ladder relative to each other.

[0006] By adopting the above structure, the drive structure of rack, pinion and hydraulic motor replaces the manual retraction and extension method of the traditional grounding auxiliary ladder, realizing the automatic extension and retraction of the auxiliary ladder, shortening the time spent on retraction and extension, and saving manpower. At the same time, the addition of a locking component can fix the fixed arm relative to the auxiliary ladder, solving the safety hazards such as position displacement and shaking that are prone to occur during traditional manual retraction and extension, and improving the safety and convenience of the auxiliary ladder in retraction, extension and use.

[0007] Preferably, the locking assembly includes a fixing frame, a pressure rod, and a locking tooth. The fixing frame is fixedly connected to the fixing arm, the pressure rod is hinged to the fixing frame, the locking tooth is fixedly connected to the pressure rod and meshes with the rack, and an elastic element is provided between the pressure rod and the fixing frame to maintain the meshing state of the locking tooth and the rack.

[0008] With the above structure, the locking teeth and rack are kept in engagement by the elastic element, and automatic locking can be achieved without additional manual operation, making operation more convenient. The locking method of engaging the locking teeth and rack provides a tighter fit compared to traditional buckle structures, which can more reliably limit the relative displacement between the auxiliary ladder and the fixed arm.

[0009] Preferably, the auxiliary ladder and the fixed arm are slidably engaged by a guide rail slider structure.

[0010] By adopting the above structure, the guide rail slider structure can make the extension and retraction of the auxiliary ladder smoother and more stable, reduce the frictional resistance during the sliding process, reduce component wear and extend the service life of the device.

[0011] Preferably, the length of the auxiliary ladder is equal to the length of the rack.

[0012] With the above structure, this design allows the effective transmission stroke of the rack to be perfectly matched with the extension stroke of the auxiliary ladder.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The drive structure of rack, pinion, and hydraulic motor replaces the manual retraction and extension of the traditional grounding auxiliary ladder, realizing automatic extension and retraction of the auxiliary ladder, shortening the time spent on retraction and extension, and saving manpower. At the same time, the addition of a locking component can fix the fixed arm relative to the auxiliary ladder, solving the safety hazards such as position displacement and shaking that are prone to occur during traditional manual retraction and extension, and improving the safety and convenience of the auxiliary ladder in retraction, extension, and use. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This utility model Figure 1 Enlarged structural diagram at point A; Figure 3 This utility model Figure 2 A magnified structural diagram at point B in the middle. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Reference Figures 1 to 3This application discloses an automatic retraction device for an auxiliary ladder of a ladder truck, comprising: a fixed arm 1, which is made of Q235 carbon steel and has an overall U-shaped channel structure, and is connected to the main body of the ladder truck; and an auxiliary ladder 2, which is slidably mounted on the fixed arm 1. To achieve smooth sliding between the auxiliary ladder 2 and the fixed arm 1, the two are fitted with a guide rail slider structure.

[0017] A drive assembly is disposed between the fixed arm 1 and the auxiliary ladder 2. The drive assembly includes a rack 3, a gear 4, and a hydraulic motor 5. The rack 3 is fixedly connected to both sides of the auxiliary ladder 2. The gear 4 is installed inside the fixed arm 1 and meshes with the rack 3. The hydraulic motor 5 is fixedly connected to the fixed arm 1 and its output end is connected to the gear 4 for transmission. The length of the auxiliary ladder 2 is equal to the length of the rack 3.

[0018] A locking assembly 6 is disposed on the fixed arm 1 and is used to fix the fixed arm 1 relative to the auxiliary ladder 2. The locking assembly 6 includes a fixing frame 601, a pressure rod 602, and a locking tooth 603. The fixing frame 601 is fixedly connected to the fixed arm 1, the pressure rod 602 is hinged to the fixing frame 601, and the locking tooth 603 is fixedly connected to the pressure rod 602 and meshes with the rack 3. An elastic element is provided between the pressure rod 602 and the fixing frame 601 to maintain the meshing state of the locking tooth 603 and the rack 3.

[0019] Working principle: When the main body of the aerial ladder truck is extended to the target height and the grounding auxiliary ladder needs to be extended, the operator starts the hydraulic motor 5 through the control switch in the cab of the aerial ladder truck, controlling the motor output shaft to rotate clockwise. The motor power is transmitted to the gear 4 through the coupling, causing the gear 4 to rotate clockwise synchronously; since the gear 4 meshes with the rack 3 fixed on the auxiliary ladder 2, the rotational motion of the gear 4 is converted into the linear motion of the rack 3, driving the auxiliary ladder 2 to extend away from the main body of the aerial ladder truck along the guide rail of the fixed arm 1.

[0020] When the auxiliary ladder 2 extends to the end and touches the ground, the operator shuts off the hydraulic motor 5, the gear 4 stops rotating, and the auxiliary ladder 2 stops extending; the locking assembly 6 makes the locking tooth 603 tightly mesh with the rack 3, fixing the auxiliary ladder 2 relative to the fixed arm 1.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic retraction and deployment device for an auxiliary ladder of a ladder truck, comprising: Fixed arm (1) is used to connect to the main body of the ladder truck; The auxiliary ladder (2) is slidably mounted on the fixed arm (1); A drive assembly is disposed between the fixed arm (1) and the auxiliary ladder (2). The drive assembly includes a rack (3), a gear (4) and a hydraulic motor (5). The rack (3) is fixedly connected to both sides of the auxiliary ladder (2). The gear (4) is installed inside the fixed arm (1) and meshes with the rack (3). The hydraulic motor (5) is fixedly connected to the fixed arm (1) and its output end is connected to the gear (4) for transmission. A locking component (6) is disposed on the fixed arm (1) for fixing the fixed arm (1) relative to the auxiliary ladder (2).

2. The automatic retraction and deployment device for the auxiliary ladder of a ladder truck according to claim 1, characterized in that: The locking assembly (6) includes a fixing frame (601), a pressure rod (602), and a locking tooth (603). The fixing frame (601) is fixedly connected to the fixing arm (1), the pressure rod (602) is hinged to the fixing frame (601), the locking tooth (603) is fixedly connected to the pressure rod (602) and meshes with the rack (3), and an elastic element is provided between the pressure rod (602) and the fixing frame (601) to maintain the meshing state of the locking tooth (603) and the rack (3).

3. The automatic retraction and deployment device for the auxiliary ladder of a ladder truck according to claim 1, characterized in that: The auxiliary ladder (2) and the fixed arm (1) are slidably engaged by a guide rail slider structure.

4. The automatic retraction and deployment device for the auxiliary ladder of a ladder truck according to claim 1, characterized in that: The length of the auxiliary ladder (2) is equal to the length of the rack (3).

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