CN219174082U - Telescopic arm device and fire truck - Google Patents

Abstract

The utility model provides a telescopic boom device and a fire truck, wherein the telescopic boom device comprises a telescopic boom assembly, a fixed boom, a first telescopic boom and a second telescopic boom; the driving mechanism comprises a driving rod and a rod barrel, the driving rod is sleeved in the rod barrel, the end part of the driving rod is arranged on the fixed arm, and the end part of the rod barrel, which is close to the driving rod, is arranged on the first telescopic arm; and the first end of the drag chain assembly is connected with the end part of the driving rod, and the second end of the drag chain assembly is connected with the second telescopic arm. This flexible arm device is through integrating flexible hydro-cylinder and tow chain subassembly as an organic wholely, fully utilizes the inner space of flexible arm subassembly, can reduce the distance between each flexible arm, makes each flexible arm compacter, reduces the cross-section of flexible arm subassembly, can also simplify the assembly flow and the technology of flexible arm device when reducing the dead weight of flexible arm subassembly, need not all dismantle the flexible arm device when maintaining and can accomplish the maintenance, improves work efficiency.

Description

Telescopic arm device and fire truck

Technical Field

The application relates to the field of fire-fighting operation equipment, in particular to a telescopic boom device and a fire truck.

Background

The telescopic arm support is also called as a telescopic arm, and is short for the arm support with a certain load capacity by changing the length through a telescopic oil cylinder and a telescopic mechanism. The telescopic arm is a main bearing component of the fire truck and is one of main manifestations of the height and the functions of the whole truck. The telescopic arm is formed by nesting a plurality of sections of box-shaped arms, and the telescopic arm is extended and retracted by providing power through an oil cylinder and a plate-type chain.

At present, the existing technical schemes of synchronous telescopic arms are basically two, one is that a telescopic oil cylinder is inverted, and a drag chain system is arranged on the outer side of an arm support; the other is that the telescopic oil cylinder is inverted, and the drag chain system is arranged on the inner side of the arm support. The drag chain arranged on the inner side of the arm support is generally arranged between the first arm and the second arm, and the drag chain is arranged between the first arm and the second arm, so that the distance between the first arm and the second arm is larger, the section of the arm support is enlarged, and the arm support is heavier; in addition, because the drag chain and the oil cylinder are independently installed, time and labor are wasted in assembly, and if any part of the drag chain and the oil cylinder has a problem in the use process, the arm support is required to be completely disassembled for maintenance, so that the workload is high.

Therefore, there is a need to design a telescopic arm to solve the above-mentioned problems.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model provides the telescopic boom device and the fire truck, and the problems of large weight, difficult installation and maintenance of the existing telescopic boom are effectively solved.

According to a first aspect of the present utility model there is provided a telescopic boom apparatus, wherein the telescopic boom apparatus comprises a telescopic boom assembly comprising a fixed arm, a first telescopic boom and a second telescopic boom; the driving mechanism comprises a driving rod and a rod barrel, the driving rod is sleeved in the rod barrel, the end part of the driving rod is arranged on the fixed arm, and the end part of the rod barrel, which is close to the driving rod, is arranged on the first telescopic arm; and the first end of the drag chain assembly is connected with the end part of the driving rod, and the second end of the drag chain assembly is connected with the second telescopic arm.

Preferably, the drag chain assembly comprises a drag chain, a first end of which is connected with the second telescopic arm; the guide box is arranged at the top of the rod barrel; the sliding box is slidably arranged in the guide box, a first end of the sliding box is connected with the fixed arm, and a second end of the sliding box is connected with a second end of the drag chain.

Preferably, after the drag chain is connected with the sliding box, the drag chain is bent from one end of the pole barrel, which is far away from the driving pole, and the bent part of the drag chain is positioned at the bottom of the pole barrel.

Preferably, a plurality of support plates are arranged at the top of the pole barrel, the support plates are sequentially arranged at the top of the pole barrel at intervals, and the guide box is arranged at the tops of the plurality of support plates.

Preferably, the drag chain assembly further comprises a sliding block, the sliding block is arranged between the sliding box and the guide box, and the sliding box is slidably connected with the guide box through the sliding block; the sliding blocks are arranged at two ends of the sliding box.

Preferably, guide sliding blocks are arranged on two sides of the end part of the rod barrel, and the guide sliding blocks are abutted against the inner side surfaces of the second telescopic arms.

Preferably, a limiting block is arranged at the top of the end part, far away from the driving rod, of the rod barrel, a through hole is formed in the middle of the limiting block, and the first end of the drag chain assembly penetrates through the through hole to be connected with the end part of the driving rod.

Preferably, the telescopic arm device further comprises a pulley assembly, the pulley assembly comprises a first pulley assembly and a second pulley assembly, the first pulley assembly is arranged on the side part of the pole barrel, a first end of the first pulley assembly is connected with the end part of the driving pole, and a second end of the first pulley assembly is connected with the end part, close to the driving pole, of the second telescopic arm;

the second pulley assembly is arranged between the fixed arm and the first telescopic arm, the first end of the second pulley assembly is connected with the end part, close to the driving rod, of the second telescopic arm, and the second end of the second pulley assembly is connected with the end part, far away from the driving rod, of the fixed arm.

Preferably, the first pulley assembly comprises two first pulley blocks, the two first pulley blocks are respectively arranged on two sides of the pole barrel, the two first pulley blocks comprise a first pulley and a first chain, the first pulley is arranged on one side of the pole barrel, which is far away from the end part of the driving pole, the first chain is wound around the first pulley, the first end of the first chain is connected with the end part of the driving pole, and the second end of the first chain is connected with the end part of the second telescopic arm, which is close to the driving pole; the second pulley assembly comprises two second pulley blocks, the two second pulley blocks are arranged between the fixed arm and the first telescopic arm, the two second pulley blocks comprise second pulleys and a second chain, the second pulleys are arranged between the fixed arm and the end part, close to the driving rod, of the first telescopic arm, the second pulleys are wound on the second chain, the first end of the second chain is connected with the end part, close to the driving rod, of the second telescopic arm, and the second end of the second chain is connected with the end part, far away from the driving rod, of the fixed arm.

According to a second aspect of the present utility model there is provided a fire engine, wherein the fire engine comprises a telescopic arm arrangement as described above.

According to the telescopic arm device, the telescopic arm assembly and the drag chain assembly are integrated, so that the inner space of the telescopic arm assembly is fully utilized, the distance between telescopic arms can be reduced, the telescopic arms are more compact, the section of the telescopic arm assembly is reduced, the dead weight of the telescopic arm assembly is reduced, meanwhile, the assembly flow and the process of the telescopic arm device can be simplified, and the telescopic arm device can be maintained without being completely disassembled during maintenance, so that the working efficiency is improved.

In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 illustrates a schematic structural view of a telescopic ram and tow chain assembly integration according to an embodiment of the present utility model;

fig. 2 shows a schematic structural view of a telescopic ram according to an embodiment of the present utility model;

FIG. 3 illustrates a front view of a telescoping arm assembly according to an embodiment of the present utility model;

FIG. 4 shows a schematic structural view of a cable arrangement according to an embodiment of the utility model;

fig. 5 is a schematic structural view showing an initial state of the telescopic arm apparatus according to the embodiment of the present utility model;

fig. 6 shows a schematic view of the telescopic arm apparatus according to an embodiment of the present utility model, in a configuration in which it is extended to a position.

Reference numerals: 1-a fixed arm; 101-a first fixing seat; 2-a first telescopic arm; 201-a second fixing seat; 3-a second telescopic arm; 301-sliding grooves; 4-a piston rod; 5-cylinder barrel; 6-drag chain; 7-a guide box; 8-a slide cassette; 9-supporting plates; 10-sliding blocks; 11-guiding a sliding block; 12-limiting blocks; 13-a first pulley; 14-a first chain; 15-a second pulley; 16-a second chain; 17-cable.

Detailed Description

The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatus, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be apparent after an understanding of the present disclosure. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but rather, obvious variations may be made upon an understanding of the present disclosure, other than operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

The features described herein may be embodied in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein have been provided solely to illustrate some of the many possible ways of implementing the methods, devices, and/or systems described herein that will be apparent after a review of the disclosure of the present application.

In the entire specification, when an element (such as a layer, region or substrate) is described as being "on", "connected to", "bonded to", "over" or "covering" another element, it may be directly "on", "connected to", "bonded to", "over" or "covering" another element or there may be one or more other elements interposed therebetween. In contrast, when an element is referred to as being "directly on," directly connected to, "or" directly coupled to, "another element, directly on," or "directly covering" the other element, there may be no other element intervening therebetween.

As used herein, the term "and/or" includes any one of the listed items of interest and any combination of any two or more.

Although terms such as "first," "second," and "third" may be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first member, component, region, layer or section discussed in examples described herein could also be termed a second member, component, region, layer or section without departing from the teachings of the examples.

For ease of description, spatially relative terms such as "above … …," "upper," "below … …," and "lower" may be used herein to describe one element's relationship to another element as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "upper" relative to another element would then be oriented "below" or "lower" relative to the other element. Thus, the term "above … …" includes both orientations "above … …" and "below … …" depending on the spatial orientation of the device. The device may also be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. Singular forms also are intended to include plural forms unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" are intended to specify the presence of stated features, integers, operations, elements, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, operations, elements, and/or groups thereof.

Variations from the shapes of the illustrations as a result, of manufacturing techniques and/or tolerances, are to be expected. Accordingly, the examples described herein are not limited to the particular shapes shown in the drawings, but include changes in shapes that occur during manufacture.

The features of the examples described herein may be combined in various ways that will be apparent after an understanding of the disclosure of the present application. Further, while the examples described herein have a variety of configurations, other configurations are possible as will be apparent after an understanding of the present disclosure.

According to a first aspect of the present utility model there is provided a telescopic arm apparatus, as shown in figures 1 to 6, which may be used in a fire engine, the telescopic arm apparatus comprising a telescopic arm assembly, a drive mechanism and a tow chain assembly.

In the following description, detailed structures of a telescopic arm assembly, a driving mechanism, and a drag chain assembly of the telescopic arm apparatus will be described in detail with reference to fig. 1 to 6.

As shown in fig. 3 to 6, in an embodiment, the telescopic arm assembly may include a fixed arm 1, a first telescopic arm 2, and a second telescopic arm 3. Specifically, the fixed arm 1, the first telescopic arm 2, and the second telescopic arm 3 may be formed in an approximately rectangular parallelepiped structure, and the lengths of the three may be the same or may be different. The cross-sectional area of the fixed arm 1 is the biggest, and the cross-sectional area of the first telescopic arm 2 is less than the cross-sectional area of the fixed arm 1, is greater than the cross-sectional area of the second telescopic arm 3, and the inside of the fixed arm 1 is located to the inside of the first telescopic arm 2 is located to the cover of the first telescopic arm 2.

Preferably, as shown in fig. 3, in the embodiment, from a front view, the end of the fixed arm 1 forms a first fixing seat 101, the first fixing seat 101 is generally located at one end of the fixed arm 1 near the chassis of the fire engine and is used for fixedly connecting a piston rod 4 of a telescopic cylinder described below, the end of the first telescopic arm 2 is formed with a second fixing seat 201, the second fixing portion is generally located at the end of the first telescopic arm 2 near the first fixing seat 101 and is used for fixedly connecting a cylinder 5 of the telescopic cylinder described below, two sides of the bottom of the second telescopic arm 3 are formed with sliding grooves 301, the sliding grooves 301 can be formed by welding three angle steel and the inner surface of the second telescopic arm 3, the sliding grooves 301 extend from one end of the second telescopic arm 3 to the other end, and the sliding grooves 301 can be matched with a guiding sliding block 11 described below to ensure that the telescopic cylinder and the telescopic arm assembly keep horizontal, and in addition, the sliding grooves 301 can also be used for penetrating the cable 17.

As shown in fig. 1 and 2, in the embodiment, the driving mechanism may be, for example, a telescopic cylinder, but is not limited thereto, and a mechanism capable of achieving telescopic and having sufficient power strength, such as an electric cylinder, an air cylinder, or the like, may be selected. In this way, the drive rod may in an embodiment be for example a piston rod 4 and the cylinder may be for example a cylinder 5. The telescopic cylinder can be, for example, a hydraulic cylinder in the prior art, and can meet enough strength and use conditions. Specifically, the end portion of the piston rod 4 is formed with a first connection portion, and is fixedly connected with the first fixing seat 101 through the first connection portion, for example, a plurality of threaded holes may be formed on two sides of the first connection portion, and corresponding connection holes are formed on the first fixing seat 101, and the two are fixedly connected through fastening bolts. The piston rod 4 is fixedly connected to the fixed arm 1, and in the case of using the telescopic arm device, the fixed arm 1 and the piston rod 4 remain stationary. The end of the cylinder 5 near the piston rod 4 is formed with a second connecting portion, and is fixedly connected to the second fixing base 201 by a fastening bolt, for example. Under the condition that the telescopic oil cylinder moves, as the piston rod 4 is fixed, the cylinder barrel 5 moves in the direction away from the piston rod 4, and then the first telescopic arm 2 is driven to move in the direction away from the fixed arm 1, so that the first part of the telescopic arm device extends out.

As shown in fig. 1 and 2, in the embodiment, the first end of the drag chain assembly is fixedly connected with the end portion of the piston rod 4, the second end of the drag chain assembly is fixedly connected with the second telescopic arm 3, and the telescopic arm device can be detached and maintained integrally during assembly and maintenance by integrating the drag chain assembly and the telescopic cylinder into a whole, so that the working efficiency is improved, and in addition, the distance between the drag chain assembly and the second telescopic arm 3 can be reduced due to the arrangement of the drag chain assembly at the end portion of the second telescopic arm 3, the internal space of the telescopic arm assembly is fully utilized, the section of the telescopic arm assembly is reduced, and the whole dead weight is reduced.

Preferably, as shown in fig. 1 and 2, in an embodiment, the drag chain assembly may include a drag chain 6, a guide box 7, and a slide box 8. Specifically, the drag chain 6 may be a component in the prior art, as long as sufficient strength and use conditions are satisfied. The top of the cylinder 5 is provided with a plurality of support plates 9, which support plates 9 may be formed as a top-level bracket structure, which in turn are arranged at intervals on the top of the cylinder 5, in a manner which may be, for example, welding. The connecting holes are formed at the two ends of the horizontal top of the supporting plate 9, and the guide box 7 is fixedly connected to the top of the supporting plate 9 by using fastening threads. The guide box 7 may be formed as a U-shaped groove, the length of which corresponds to the cylinder 5. The inside of the U-shaped groove is placed with a sliding box 8, and the sliding box 8 may be, for example, a rectangular parallelepiped sliding block formed into a hollow inside for placing the cable 17. The first end of the sliding box 8 is fixedly connected to the end of the piston rod 4, which may be e.g. welded or by using a fastening bolt, and the second end of the sliding box 8 is fixedly connected to the drag chain 6. The drag chain 6 is arranged at one end of the cylinder 5 far away from the piston rod 4, the second end of the drag chain 6 is arranged at the top of the cylinder 5, the first end of the drag chain 6 is arranged at the bottom of the cylinder 5, the first end of the drag chain 6 can be arranged between the two sliding grooves 301 and fixedly mounted on the second telescopic arm 3 (as shown in fig. 1, the drag chain 6 at the bottom is arranged in the protective housing, so that the protective housing can be fixedly connected with the second telescopic arm 3), and the second end of the drag chain 6 can be fixedly connected with the second end of the sliding box 8 by using a connecting plate. So, when cylinder 5 moves, slide box 8 is motionless, and direction box 7 follows cylinder 5 and moves to the direction of keeping away from piston rod 4, and drag chain 6 is because slide box 8 is connected to the second end, and the second telescopic arm 3 is connected to the first end, and during the motion, drag chain 6 at cylinder 5 top is pulled, and drag chain 6 at cylinder 5 bottom can drive the second telescopic arm 3 for second telescopic arm 3 stretches out.

Preferably, as shown in fig. 1 and 2, in the embodiment, a sliding block 10 is provided between the guide box 7 and the sliding box 8. The sliding block 10 is matched with the guide box 7 in shape and is arranged on the inner side of the guide box 7, the sliding block 10 is fixedly connected to the bottom of the sliding box 8, and a fastening bolt can be used for fixing connection. The number of the sliding blocks 10 may be two, and the sliding blocks 10 may be respectively disposed at two ends of the sliding box 8, so that when the guide box 7 and the sliding box 8 realize relative movement, only two sliding blocks 10 contact each other, and sliding friction force may be reduced. Preferably, the slider 10 may be a nylon slider.

Preferably, as shown in fig. 1 and 2, in an embodiment, the end of the cylinder 5 remote from the piston rod 4 is also fitted with a guide slide 11 and a stop block 12. Specifically, the guide slide blocks 11 are installed on two sides of the end portion of the cylinder 5 and cling to the second telescopic arm 3 and the sliding groove 301, when the cylinder 5 slides, the guide slide blocks 11 can ensure that the telescopic cylinder and the telescopic arm assembly keep horizontal and stable movement, meanwhile, the middle portions of the guide slide blocks 11 are inwards recessed to form through holes, and the guide slide blocks can be used for threading of the cables 17. The stopper 12 sets up the top of the tip of cylinder 5, and the through-hole with tow chain 6 assorted is seted up at the middle part of stopper 12, and the second end of tow chain 6 passes through the through-hole and connects slip box 8. The movement track of the drag chain 6 can be restrained by the limiting block 12.

It will be appreciated that the guide box 7 and the slide box 8 serve mainly as guides for the movement of the drag chain or cable, and that the second end of the drag chain 6 is directly connected to the end of the piston rod 4 through the through hole without the guide box 7 and the slide box 8.

Preferably, as shown in fig. 5 and 6 (because the telescopic arm is too long to be shown, the telescopic arm device further comprises a pulley assembly in the embodiment, the telescopic arm device is shown by a broken line, namely a broken line in the figure). The pulley assembly may include a first pulley assembly and a second pulley assembly. The first pulley assembly is arranged on the side of the cylinder 5, and the second pulley assembly is arranged between the first telescopic arm 2 and the fixed arm 1. In particular, the first pulley assembly may comprise two first pulley blocks, which are arranged on both sides of the cylinder 5, respectively. Both first pulley sets may comprise a first pulley 13 and a first chain 14. The first pulley 13 may be fixedly disposed on one side of the end portion of the cylinder 5 far away from the piston rod 4, the first pulley 13 is wound by the first chain 14, and two ends of the first chain 14 after the first pulley 13 is wound are respectively connected with the end portion of the piston rod 4 and the end portion of the second telescopic arm 3 near the piston rod 4. The second pulley assembly can comprise two second pulley blocks, the two second pulley blocks are arranged between the fixed arm 1 and the first telescopic arm 2, the two second pulley blocks can comprise a second pulley 15 and a second chain 16, the second pulley 15 is fixedly arranged on the first telescopic arm 2, the second chain 16 winds the second pulley 15, and two ends of the second chain 16, which are wound by the second pulley 15, are respectively and fixedly connected with the end part, close to the piston rod 4, of the second telescopic arm 3 and the end part, far away from the piston rod 4, of the fixed arm 1.

The first pulley assembly and the second pulley assembly are matched for use, so that the first telescopic boom 2 and the second telescopic boom 3 are telescopic at the same time, and the telescopic process is as follows: under the condition that the cylinder 5 moves in the direction away from the piston rod 4 (i.e. when the cylinder stretches out), the first telescopic arm 2 is driven to move, meanwhile, the first pulley 13 is driven to move in the direction away from the piston rod 4, at the moment, the distance between the first pulley 13 and the end part of the piston rod 4 is increased, the distance between the first pulley 13 and the end part of the second telescopic arm 3, which is close to the piston rod 4, is shortened, and then the second pulley 15 and the second chain 16 are driven to stretch out, and at the moment, the second pulley 15 and the second chain 16 also synchronously move, but do not play a driving role; under the condition that the cylinder 5 moves towards the direction close to the piston rod 4 (namely, when the cylinder is contracted), the cylinder 5 drives the first telescopic arm 2 to move, meanwhile, drives the second pulley 15 to move towards the direction close to the piston rod 4, at the moment, the distance between the second pulley 15 and the end part of the fixed arm 1, which is far away from the piston rod 4, is increased, the distance between the second pulley 15 and the end part of the second telescopic arm 3, which is close to the piston rod 4, is shortened, and then the retraction of the second telescopic arm 3 is driven, at the moment, the first pulley 13 and the first chain 14 synchronously move, but the driving function is not realized.

In addition, as shown in fig. 4, in the embodiment, the wiring of the telescopic arm device is as shown in the drawing, and the cable 17 of the drag chain 6 is penetrated through the chute 301 and connected with the drag chain 6; the hollow interior of the slide cassette 8 can be used for routing, following the telescopic cylinder movement.

When the telescopic boom device is assembled, firstly, the telescopic cylinder and the drag chain assembly are assembled (namely, the assembly process is as shown in fig. 1), then three sections of telescopic booms are assembled, namely, a fixed boom 1, a first telescopic boom 2 and a second telescopic boom 3 are respectively assembled, the fixed boom 1 is installed at the installation position of the telescopic booms, then the integrated telescopic cylinder and drag chain assembly is integrally pushed in from the rear of the fixed boom 1, finally, the integrated telescopic cylinder and drag chain assembly are connected with a sliding chute 301 through a first fixing seat 101 and a second fixing seat 201, and the assembly is completed through a connecting cable 17.

This flexible arm device is through integrating flexible hydro-cylinder and tow chain subassembly as an organic wholely, has fully utilized the inner space of flexible arm subassembly, can reduce the distance between each flexible arm, makes each flexible arm compacter, reduces the cross-section of flexible arm subassembly, can also simplify the assembly flow and the technology of flexible arm device when reducing the dead weight of flexible arm subassembly, and during the maintenance, need not all dismantle the flexible arm device can accomplish the maintenance, improves work efficiency.

Further, according to a second aspect of the present utility model there is provided a fire truck comprising a telescopic arm arrangement as described above.

Finally, it should be noted that: the foregoing examples are merely specific embodiments of the present application, and are not intended to limit the scope of the present application, but the present application is not limited thereto, and those skilled in the art will appreciate that while the foregoing examples are described in detail, the present application is not limited thereto. Any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or make equivalent substitutions for some of the technical features within the technical scope of the disclosure of the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A telescopic boom apparatus, the telescopic boom apparatus comprising:

the telescopic arm assembly comprises a fixed arm, a first telescopic arm and a second telescopic arm;

the driving mechanism comprises a driving rod and a rod barrel, the driving rod is sleeved in the rod barrel, the end part of the driving rod is arranged on the fixed arm, and the end part of the rod barrel, which is close to the driving rod, is arranged on the first telescopic arm;

and the first end of the drag chain assembly is connected with the end part of the driving rod, and the second end of the drag chain assembly is connected with the second telescopic arm.

2. The telescopic arm apparatus of claim 1, wherein the tow chain assembly comprises:

a drag chain, the first end of which is connected with the second telescopic arm;

the guide box is arranged at the top of the rod barrel;

the sliding box is slidably arranged in the guide box, a first end of the sliding box is connected with the fixed arm, and a second end of the sliding box is connected with a second end of the drag chain.

3. The telescopic arm apparatus according to claim 2, wherein the drag chain is bent from an end of the pole barrel away from the driving pole after being connected to the slide box, and the bent drag chain is located at the bottom of the pole barrel.

4. A telescopic arm apparatus according to claim 3, wherein the top of the mast is provided with a plurality of support plates, which are sequentially arranged at intervals on the top of the mast, and the guide box is arranged on the top of a plurality of support plates.

5. The telescopic arm apparatus according to claim 2, wherein the drag chain assembly further comprises a slider block disposed between the slider block and the guide box, the slider block being slidably connected with the guide box through the slider block; the sliding blocks are arranged at two ends of the sliding box.

6. The telescopic arm apparatus according to claim 1, wherein guide sliders are provided on both sides of the end of the lever barrel, the guide sliders abutting against the inner side face of the second telescopic arm.

7. The telescopic arm apparatus according to claim 1, wherein a stopper is provided at a top of the end of the pole barrel remote from the driving pole, a through hole is provided in a middle portion of the stopper, and the first end of the drag chain assembly passes through the through hole to connect the end of the driving pole.

8. The telescopic arm apparatus of claim 1, further comprising a pulley assembly comprising a first pulley assembly and a second pulley assembly, the first pulley assembly disposed on a side of the shaft, a first end of the first pulley assembly connected to an end of the drive rod, a second end of the first pulley assembly connected to an end of the second telescopic arm proximate to the drive rod;

the second pulley assembly is arranged between the fixed arm and the first telescopic arm, the first end of the second pulley assembly is connected with the end part, close to the driving rod, of the second telescopic arm, and the second end of the second pulley assembly is connected with the end part, far away from the driving rod, of the fixed arm.

9. The telescopic arm apparatus according to claim 8, wherein the first pulley assembly comprises two first pulley blocks, the two first pulley blocks are respectively disposed on two sides of the pole barrel, the two first pulley blocks each comprise a first pulley and a first chain, the first pulley is disposed on one side of the pole barrel far from the end of the driving pole, the first chain is wound around the first pulley, a first end of the first chain is connected with the end of the driving pole, and a second end of the first chain is connected with the end of the second telescopic arm near the driving pole;

the second pulley assembly comprises two second pulley blocks, the two second pulley blocks are arranged between the fixed arm and the first telescopic arm, the two second pulley blocks comprise second pulleys and a second chain, the second pulleys are arranged between the fixed arm and the end part, close to the driving rod, of the first telescopic arm, the second pulleys are wound on the second chain, the first end of the second chain is connected with the end part, close to the driving rod, of the second telescopic arm, and the second end of the second chain is connected with the end part, far away from the driving rod, of the fixed arm.

10. A fire truck, characterized in that it comprises a telescopic arm arrangement according to any of claims 1 to 9.

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