Telescopic arm device and fire fighting truck

Abstract

The utility model provides a telescopic arm device and a fire fighting truck, and relates to the technical field of fire fighting equipment. The telescopic arm device comprises a basic arm, a second-section telescopic arm, a third-section telescopic arm, a telescopic rod, a cylinder barrel, a chain and a chain wheel assembly. Wherein one end, close to the telescopic rod, of the cylinder barrel is connected with the two-section telescopic arm, and the other end is connected with the chain wheel assembly; and the other end of the chain is connected with the three-section telescopic arm by winding a chain wheel assembly. It can be understood that the telescopic arm device is high in integration level, the chain and the chain wheel assembly are arranged on the cylinder barrel, the internal space of the arm frame is fully utilized, the distance between the arm frame and the two-section telescopic arm is reduced, the section of the arm frame of the two-section telescopic arm is reduced, the dead weight of the arm frame of the two-section telescopic arm is reduced, and the telescopic arm device is convenient to use. Meanwhile, the assembly process and process of the telescopic arm device are simplified, and the assembly efficiency is improved; in addition, the chain is hidden in the middle of the arm support, so that rusting and aging of the chain caused by wind and sun exposure are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of fire fighting equipment, in particular to a telescopic arm device and a fire fighting truck. Background Art

[0002] At present, the technical solution of the existing three-section synchronous telescopic boom is basically to invert the telescopic cylinder, and the extension chain and sprocket are arranged above the boom or below the boom. The common solution of the two is to arrange the extension sprocket at the arm head position of the two-section telescopic boom, one end of the extension chain is fixed to the head of the first boom, and the other end of the extension chain is fixed to the tail of the three-section telescopic boom, so as to achieve synchronous extension. Since the sprocket position must be arranged at the head of the two-section telescopic boom, and the sprocket diameter must match the model of the corresponding plate chain, the sprocket diameter is relatively large, so the space between the two-section telescopic boom and the three-section telescopic boom must be increased, and the cross-section change of the boom must be relatively large to meet the arrangement of the extension chain, which leads to the increase of the cross-section of the two-section telescopic boom, the weight of the boom, and the other end of the arm head and the extension chain are also fixed and exposed to the outside. At this time, there is a situation of rust on the exposed parts.

[0003] Generally, in order to prevent one end of the wire rope fixed to the boom head from rusting, a cover is installed to avoid this problem. However, this requires additional parts, which is not only time-consuming and labor-intensive, but also unsightly. In addition, if any part fails during use, the boom must be completely disassembled for maintenance, which is a lot of work. Utility Model Content

[0004] The utility model aims to provide a telescopic arm device and a fire truck, which have the advantages of high integration, full use of the internal space of the arm frame, and reduced spacing between the two-section telescopic arms, thereby reducing the arm frame cross-section of the two-section telescopic arms and reducing the arm frame deadweight of the two-section telescopic arms.

[0005] The embodiment of the utility model is achieved as follows:

[0006] In a first aspect, the utility model provides a telescopic arm device, including a basic arm, a two-section telescopic arm, a three-section telescopic arm, a telescopic rod, a cylinder, a chain and a sprocket assembly;

[0007] The three-section telescopic arm is sleeved in the inner cavity of the two-section telescopic arm, and the two-section telescopic arm is sleeved in the inner cavity of the basic arm;

[0008] One end of the telescopic rod is sleeved in the inner cavity of the cylinder, and the other end is connected to the basic arm; one end of the cylinder close to the telescopic rod is connected to the two-section telescopic arm, and the other end is connected to the sprocket assembly; one end of the chain is connected to the telescopic rod, and the other end is wrapped around the sprocket assembly and connected to the three-section telescopic arm.

[0009] In an optional embodiment, a positioning hole is opened in the cylinder, and the sprocket assembly includes a pin, a roller and a baffle. The pin cooperates with the positioning hole, the baffle is connected to the pin, the roller is rotatably connected to the pin, and the roller is located between the baffle and the cylinder, and the chain is wrapped around the roller.

[0010] In an optional embodiment, the sprocket assembly includes two rollers and two baffles, the telescopic arm device includes two chains, the two baffles are respectively connected to the two ends of the pin shaft, and the two rollers are respectively located on both sides of the cylinder, and the chains correspond to the rollers one by one.

[0011] In an optional embodiment, the telescopic arm device also includes a first screw, a detection component and a sensor component, one end of the first screw is connected to the chain, and the other end is connected to the telescopic rod through the detection component; the sensor component is connected to the telescopic rod, and the sensor component is used to obtain the displacement of the detection component.

[0012] In an optional embodiment, the detection component includes an elastic member, a nut and a detection plate, the telescopic rod is provided with a through hole, the end of the first screw rod away from the chain is sequentially provided with a through hole, an elastic member and a detection plate connected to the nut, the elastic member is located in the through hole and is in a compressed state, the detection plate is connected to the elastic member and the detection plate is located between the nut and the telescopic rod, and the sensing component is used to obtain the displacement of the detection plate.

[0013] In an optional embodiment, the sensing assembly includes a position sensor, a screw, and a mounting plate. The mounting plate is connected to the side of the telescopic rod away from the chain via the screw, the position sensor is connected to the mounting plate, and the position of the position sensor and the displacement path of the detection plate at least partially overlap on a preset plane, and the preset plane is a plane perpendicular to the displacement path of the detection plate.

[0014] In an optional embodiment, the telescopic arm device further includes a second screw rod, and the chain is connected to the three-section telescopic arm via the second screw rod.

[0015] In an optional embodiment, the telescopic arm device also includes a first bolt and a second bolt, the basic arm is provided with a first fixed seat, and the telescopic rod is connected to the first fixed seat via the first bolt; the second-section telescopic arm is provided with a second fixed seat, and the cylinder is connected to the second fixed seat via the second bolt.

[0016] In an optional embodiment, the chain, the sprocket assembly, the cylinder, and the telescopic rod are integrated.

[0017] In a second aspect, the utility model provides a fire truck, which includes a telescopic arm device as described in any one of the aforementioned embodiments.

[0018] The beneficial effects of the embodiments of the utility model include:

[0019] The utility model provides a telescopic arm device and a fire truck, which includes a basic arm, a two-section telescopic arm, a three-section telescopic arm, a telescopic rod, a cylinder, a chain and a sprocket assembly. Among them, one end of the cylinder close to the telescopic rod is connected to the two-section telescopic arm, and the other end is connected to the sprocket assembly; one end of the chain is connected to the telescopic rod, and the other end is connected to the three-section telescopic arm by a sprocket assembly. It can be understood that the telescopic arm device provided by the utility model has a high degree of integration, and the chain and sprocket assembly are arranged on the cylinder, which makes full use of the internal space of the arm frame and reduces the distance between the two-section telescopic arm, thereby reducing the arm frame cross-section of the two-section telescopic arm, reducing the arm frame deadweight of the two-section telescopic arm, and at the same time, it simplifies the assembly process and process of the telescopic arm device, and improves the assembly efficiency; in addition, because the chain is hidden in the middle of the arm frame, it avoids rust and aging of the chain caused by wind and sun. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the overall structure of the telescopic arm device provided in an embodiment of the utility model;

[0022] Figure 2 A partial structural schematic diagram of a telescopic arm device provided in an embodiment of the utility model;

[0023] Figure 3 A schematic diagram of the structure of the basic arm, the two-section telescopic arm, the three-section telescopic arm and other components provided in the embodiment of the utility model before assembly;

[0024] Figure 4 A schematic diagram of the structure of the basic arm, the two-section telescopic arm, the three-section telescopic arm and other components provided in the embodiment of the utility model after being assembled;

[0025] Figure 5 A schematic diagram of the integrated arrangement of a chain, a sprocket assembly, a cylinder and a telescopic rod provided in an embodiment of the utility model;

[0026] Figure 6 A schematic diagram of the assembly of the cylinder and telescopic rod provided in the embodiment of the utility model;

[0027] Figure 7 Another schematic diagram of the integrated arrangement of the chain, sprocket assembly, cylinder and telescopic rod provided in an embodiment of the utility model;

[0028] Figure 8 The embodiment of the utility model provides Figure 7 Schematic diagram of the cross section at BB;

[0029] Fig. 9 The embodiment of the utility model provides Figure 2 Schematic diagram of the cross section at AA in the middle.

[0030] Icons: 10-telescopic arm device; 100-basic arm; 110-first fixed seat; 200-two-section telescopic arm; 130-second fixed seat; 300-three-section telescopic arm; 410-telescopic rod; 411-through hole; 413-first connecting seat; 430-cylinder; 431-positioning hole; 433-second connecting seat; 510-chain; 511-first screw; 513-second screw; 530-sprocket assembly; 531-pin shaft; 533-roller; 535-baffle; 600-detection assembly; 610-elastic member; 630-nut; 650-detection plate; 700-sensing assembly; 710-position sensor; 730-screw; 750-mounting plate; 910-traction rope; 930-pulley assembly. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0035] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Figure 1 This is a schematic diagram of the overall structure of the telescopic arm device 10 provided in an embodiment of the utility model. Figure 2 This is a partial structural diagram of the telescopic arm device 10 provided in the embodiment of the utility model. Figure 1 and Figure 2 The utility model provides a telescopic arm device 10, which includes a basic arm 100, a two-section telescopic arm 200, a three-section telescopic arm 300, a telescopic rod 410, a cylinder 430, a chain 510 and a sprocket assembly 530.

[0038] Among them, the three-section telescopic arm 300 is sleeved in the inner cavity of the two-section telescopic arm 200, and the two-section telescopic arm 200 is sleeved in the inner cavity of the basic arm 100; one end of the telescopic rod 410 is sleeved in the inner cavity of the cylinder 430, and the other end is connected to the basic arm 100; one end of the cylinder 430 close to the telescopic rod 410 is connected to the two-section telescopic arm 200, and the other end is connected to the sprocket assembly 530; one end of the chain 510 is connected to the telescopic rod 410, and the other end is wrapped around the sprocket assembly 530 and connected to the three-section telescopic arm 300.

[0039] Through the above arrangement, when the cylinder 430 moves in a direction away from the telescopic rod 410, the two-section telescopic arm 200 and the sprocket assembly 530 connected to the cylinder 430 move synchronously in a direction away from the telescopic rod 410. Based on this, the chain 510 between the end of the telescopic rod 410 connected to the basic arm 100 and the sprocket assembly 530 becomes longer and longer, and the chain 510 between the end of the three-section telescopic arm 300 connected to the chain 510 and the sprocket assembly 530 becomes shorter and shorter. Therefore, the basic arm 100, the two-section telescopic arm 200 and the three-section telescopic arm 300 are all extended, and at this time, the telescopic arm device 10 is in a state of increasing the arm length. It can be understood that the process of the telescopic arm device 10 in a state of shortening the arm length is similar to the above, and will not be repeated here.

[0040] In addition, it can be understood that the telescopic arm device 10 provided by the utility model has a high degree of integration. The chain 510 and the sprocket assembly 530 are arranged on the cylinder 430, which fully utilizes the internal space of the arm frame and reduces the distance between the two-section telescopic arm 200, thereby reducing the arm frame cross-section of the two-section telescopic arm 200, reducing the arm frame deadweight of the two-section telescopic arm 200, and at the same time simplifying the assembly process and process of the telescopic arm device 10, thereby improving the assembly efficiency; in addition, because the chain 510 is hidden in the middle of the arm frame, rust and aging caused by wind and sun exposure of the chain 510 are avoided.

[0041] In addition, it should be noted that the cylinder barrel 430 and the telescopic rod 410 together form a telescopic cylinder. Moreover, the telescopic cylinder can be any one of a hydraulic cylinder, a pneumatic cylinder or an electric push rod, which is not limited in this embodiment.

[0042] See also Figure 3 and Figure 4 In order to facilitate the fastening connection between the various components of the telescopic arm device 10 and avoid interference between the various components during movement, the telescopic arm device 10 also includes a first bolt and a second bolt. The basic arm 100 is provided with a first fixed seat 110, and the telescopic rod 410 is connected to the first fixed seat 110 through the first bolt; the cylinder 430 is provided with a second fixed seat 130, and the two-section telescopic arm 200 is connected to the second fixed seat 130 through the second bolt.

[0043] By setting the first fixing seat 110 and the second fixing seat 130, a certain distance is respectively provided between the arm frame of the basic arm 100 and the body of the telescopic rod 410, and a certain distance is provided between the arm frame of the second-section telescopic arm 200 and the body of the cylinder 430, thereby preventing the above components from colliding or interfering with each other during the operation of the telescopic arm device 10, causing the telescopic arm device 10 to jam.

[0044] To further avoid the occurrence of jamming of the telescopic arm device 10, please refer to Figure 2A first connecting seat 413 may also be provided at the end of the telescopic rod 410, and the first connecting seat 413 is connected to the first fixing seat 110 through a first bolt; a second connecting seat 433 may also be provided on the cylinder 430, and the second connecting seat 433 is connected to the second fixing seat 130 through a second bolt.

[0045] In some embodiments, see Figure 5 , the chain 510, the sprocket assembly 530, the cylinder 430, and the telescopic rod 410 are integrated. In detail, the chain 510, the sprocket assembly 530, the cylinder 430, and the telescopic rod 410 are integrated into a traction module. After the three-section telescopic arm 300, the two-section telescopic arm 200, and the basic arm 100 are assembled in sequence, the integrated traction module is pushed in from the open end of the basic arm 100, and the telescopic rod 410 is connected to the basic arm 100. It can be understood that when the relative position of the cylinder 430, the sprocket assembly 530, or the telescopic rod 410 in the traction module is adjusted, it will drive the other components in the traction module to move synchronously, and drive the other components connected to the traction module to move synchronously together.

[0046] See also Figure 6 , Figure 7 and Figure 8 ,in, Figure 8 for Figure 7 Schematic diagram of the structural cross-section at BB in the middle. To facilitate the operation of the telescopic arm device 10, the cylinder 430 is provided with a positioning hole 431, and the sprocket assembly 530 includes a pin 531, a roller 533 and a baffle 535. The pin 531 cooperates with the positioning hole 431, the baffle 535 is connected to the pin 531, the roller 533 is rotatably connected to the pin 531, and the roller 533 is located between the baffle 535 and the cylinder 430, and the chain 510 is wound around the roller 533.

[0047] It is understandable that the roller 533 is located between the cylinder 430 and the baffle 535, which can prevent the roller 533 from slipping off the pin 531 and causing the telescopic arm device 10 to fail. In addition, when the position of the cylinder 430 changes, the positions of the pin 531 and the roller 533 change synchronously, and the roller 533 applies a force consistent with its own movement direction to the chain 510, so that the chain 510 slides relative to the roller 533, that is, the chain 510 between the roller 533 and the first connecting seat 413 becomes longer, and the chain 510 between the roller 533 and the three-section telescopic arm 300 becomes shorter, that is, the chain 510 drives the three-section telescopic arm 300 to extend.

[0048] In some embodiments, the sprocket assembly 530 includes a roller 533 and a baffle 535, that is, a chain 510 is wound around the sprocket and realizes the traction of the three-section telescopic arm 300. In other embodiments, in order to balance the traction force on the three-section telescopic arm 300, the sprocket assembly 530 includes two rollers 533 and two baffles 535, the telescopic arm device 10 includes two chains 510, the two baffles 535 are respectively connected to the two ends of the pin 531, and the two rollers 533 are respectively located on both sides of the cylinder 430, and the chain 510 corresponds to the rollers 533 one by one. Optionally, the two rollers 533 are symmetrically arranged on both sides of the cylinder 430, and the two baffles 535 are also symmetrically arranged on both sides of the cylinder 430.

[0049] Based on the above configuration, when the cylinder 430 moves in a direction away from the telescopic rod 410 (i.e., when it is extended), it drives the two-section telescopic arm 200 to move, and at the same time drives the roller 533 to move in a direction away from the telescopic rod 410. At this time, the distance between the roller 533 and the end of the telescopic rod 410 increases, and the chain 510 between the two also increases accordingly. Since the length of the chain 510 is fixed, accordingly, the length of the chain 510 between the roller 533 and the three-section telescopic arm 300 is shortened, that is, the distance between the roller 533 and the end of the three-section telescopic arm 300 close to the telescopic rod 410 is shortened, and the three-section telescopic arm 300 is extended.

[0050] Also, please refer again to Figure 1 In addition to the chain 510 and the sprocket assembly 530, the traction function is also realized by a traction rope 910 and a pulley assembly 930. In detail, the pulley assembly 930 is fixed to one end of the two-section telescopic arm 200 close to the basic arm 100, the traction rope 910 is wound around the pulley assembly 930, and the two ends are respectively fixed to the end of the three-section telescopic arm 300 close to the telescopic rod 410 and the end of the basic arm 100 away from the telescopic rod 410.

[0051] It should be noted that when the telescopic arm device 10 is in the extended state, the traction rope 910 and the pulley assembly 930 move synchronously but have no driving effect. When the cylinder in the telescopic arm device 10 moves in the direction close to the telescopic rod 410 (i.e., when it is retracted), the traction rope 910 and the pulley assembly 930 have similar functions to the chain 510 and the sprocket assembly 530 in the extended state, and at this time, the chain 510 and the sprocket assembly 530 move synchronously but have no driving effect, which will not be described in detail here.

[0052] See also Figure 2 , Figure 5 as well as Fig. 9 ,in, Fig. 9 for Figure 2Schematic cross-sectional view of the structure at AA. To further fix the chain 510 to achieve the traction function, the telescopic arm device 10 also includes a first screw 511, a detection assembly 600 and a sensor assembly 700. One end of the first screw 511 is connected to the chain 510, and the other end is connected to the telescopic rod 410 through the detection assembly 600; the sensor assembly 700 is connected to the telescopic rod 410, and the sensor assembly 700 is used to obtain the displacement of the detection assembly 600. Similarly, the telescopic arm device 10 also includes a second screw 513, and the chain 510 is connected to the three-section telescopic arm 300 through the second screw 513.

[0053] It should be noted that, as an optional embodiment, the first screw rod 511 is connected to the first connection seat 413, and the sensor assembly 700 and the detection assembly 600 are both disposed on the first connection seat 413. Furthermore, it should be noted that the sensor assembly 700, the detection assembly 600, the first screw rod 511 and the second screw rod 513 are all in a one-to-one correspondence with the chain 510.

[0054] Based on the above configuration, when the chain 510 breaks, the detection assembly 600 will be displaced to a certain extent relative to the telescopic rod 410 assembly by the reaction force, and the sensor assembly 700 also disposed on the telescopic rod 410 will obtain the displacement, thereby obtaining a signal indicating that the chain 510 is broken.

[0055] Specifically, see Fig. 9 In some embodiments, the detection component 600 includes an elastic member 610, a nut 630 and a detection plate 650. The telescopic rod 410 is provided with a through hole 411. The end of the first screw 511 away from the chain 510 is sequentially penetrated by the through hole 411, the elastic member 610 and the detection plate 650 are connected with the nut 630. The elastic member 610 is located in the through hole 411 and is in a compressed state. The detection plate 650 is connected with the elastic member 610 and the detection plate 650 is located between the nut 630 and the telescopic rod 410. The sensor component 700 is used to obtain the displacement of the detection plate 650.

[0056] When the chain 510 breaks, the first screw 511 is acted upon by a reaction force. At this time, the first screw 511, the detection plate 650, the elastic member 610 and the nut 630 all slide toward the side away from the chain 510. When the elastic member 610 is separated from the through hole 411, the compression state is released, further assisting in pushing the detection plate 650 and the nut 630 to continue sliding. Based on the above, the sensor assembly 700 obtains the displacement of the detection plate 650, thereby obtaining a signal of the chain 510 breaking.

[0057] In detail, the sensor assembly 700 includes a position sensor 710, a screw 730 and a mounting plate 750. The mounting plate 750 is connected to the side of the telescopic rod 410 away from the chain 510 through the screw 730. The position sensor 710 is connected to the mounting plate 750, and the position of the position sensor 710 and the displacement path of the detection plate 650 at least partially overlap on a preset plane, which is a plane perpendicular to the displacement path of the detection plate 650. Fig. 9 As shown, Fig. 9 The direction indicated by the arrow is the displacement path direction of the detection plate 650 .

[0058] It should be emphasized that the position of the position sensor 710 and the displacement path of the detection plate 650 at least partially overlap on the preset plane. When the chain 510 is not broken, the detection plate 650 does not move. At this time, the detection plate 650 and the position sensor 710 are misaligned, and the position sensor 710 cannot detect the detection plate 650. When the chain 510 is broken, the detection plate 650 is displaced. At this time, the detection plate 650 will pass through the position sensor 710 during movement, so that the position sensor 710 obtains the displacement information, thereby obtaining a signal that the chain 510 is broken.

[0059] In other embodiments, the detection component 600 may also refer to a plurality of detection patches attached to the first screw rod 511 , and the sensor component 700 fixed to the telescopic rod 410 may obtain signals from different detection patches passing through it.

[0060] In addition, it can be understood that the detection component 600 and the sensor component 700 are both arranged at one end of the telescopic rod 410 close to the basic arm 100, that is, the two can be arranged on the above-mentioned first connecting seat 413. Based on this, it is also explained that when the first fixing seat 110 is used as the arm head of the basic arm 100 and the other end is used as the arm tail of the basic arm 100, the detection component 600 and the sensor component 700 are located at the arm head of the basic arm 100 instead of the arm tail, thereby reducing the wiring on the arm frame of the basic arm 100 and avoiding the need to set a protective cover for the sensor component 700, thereby achieving the purpose of reducing production costs and assembly costs.

[0061] In summary, the utility model provides a telescopic arm device 10, which includes a basic arm 100, a two-section telescopic arm 200, a three-section telescopic arm 300, a telescopic rod 410, a cylinder 430, a chain 510 and a sprocket assembly 530. Among them, one end of the cylinder 430 close to the telescopic rod 410 is connected to the two-section telescopic arm 200, and the other end is connected to the sprocket assembly 530; one end of the chain 510 is connected to the telescopic rod 410, and the other end is connected to the three-section telescopic arm 300 around the sprocket assembly 530. It can be understood that the telescopic arm device 10 provided by the utility model has a high degree of integration. The chain 510 and the sprocket assembly 530 are arranged on the cylinder 430, which fully utilizes the internal space of the arm frame and reduces the distance between the two-section telescopic arm 200, thereby reducing the arm frame cross-section of the two-section telescopic arm 200, reducing the arm frame deadweight of the two-section telescopic arm 200, and at the same time simplifying the assembly process and process of the telescopic arm device 10, thereby improving the assembly efficiency; in addition, because the chain 510 is hidden in the middle of the arm frame, rust and aging caused by wind and sun exposure of the chain 510 are avoided.

[0062] In addition, the utility model also provides a fire truck, which includes the telescopic arm device 10 in the above embodiment. Therefore, it also has the advantages of high integration, making full use of the internal space of the boom, reducing the distance between the two-section telescopic arm 200, thereby reducing the boom cross-section of the two-section telescopic arm 200, and reducing the deadweight of the boom of the two-section telescopic arm 200. At the same time, it also simplifies the assembly process and process of the telescopic arm device 10, and improves the assembly efficiency.

[0063] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A telescopic arm device, characterized in that: It comprises a basic arm (100), a two-section telescopic arm (200), a three-section telescopic arm (300), a telescopic rod (410), a cylinder (430), a chain (510) and a sprocket assembly (530); The three-section telescopic arm (300) is sleeved in the inner cavity of the two-section telescopic arm (200), and the two-section telescopic arm (200) is sleeved in the inner cavity of the basic arm (100); One end of the telescopic rod (410) is sleeved in the inner cavity of the cylinder (430), and the other end is connected to the basic arm (100); one end of the cylinder (430) close to the telescopic rod (410) is connected to the two-section telescopic arm (200), and the other end is connected to the sprocket assembly (530); one end of the chain (510) is connected to the telescopic rod (410), and the other end is wound around the sprocket assembly (530) and connected to the three-section telescopic arm (300).

2. The telescopic arm device according to claim 1, characterized in that: The cylinder (430) is provided with a positioning hole (431), and the sprocket assembly (530) includes a pin shaft (531), a roller (533) and a baffle (535), the pin shaft (531) cooperates with the positioning hole (431), the baffle (535) is connected to the pin shaft (531), the roller (533) is rotatably connected to the pin shaft (531), and the roller (533) is located between the baffle (535) and the cylinder (430), and the chain (510) is wound around the roller (533).

3. The telescopic arm device according to claim 2, characterized in that: The sprocket assembly (530) includes two rollers (533) and two baffles (535), the telescopic arm device (10) includes two chains (510), the two baffles (535) are respectively connected to the two ends of the pin shaft (531), and the two rollers (533) are respectively located on both sides of the cylinder barrel (430), and the chains (510) correspond to the rollers (533) one by one.

4. The telescopic arm device according to claim 1, characterized in that: The telescopic arm device (10) further comprises a first screw rod (511), a detection assembly (600) and a sensor assembly (700); one end of the first screw rod (511) is connected to the chain (510), and the other end is connected to the telescopic rod (410) through the detection assembly (600); the sensor assembly (700) is connected to the telescopic rod (410), and the sensor assembly (700) is used to obtain the displacement of the detection assembly (600).

5. The telescopic arm device according to claim 4, characterized in that: The detection assembly (600) comprises an elastic member (610), a nut (630) and a detection plate (650); the telescopic rod (410) is provided with a through hole (411); one end of the first screw rod (511) away from the chain (510) is penetrated by the through hole (411), the elastic member (610) and the detection plate (650) are connected with the nut (630) in sequence; the elastic member (610) is located in the through hole (411) and is in a compressed state; the detection plate (650) is connected with the elastic member (610) and is located between the nut (630) and the telescopic rod (410); and the sensor assembly (700) is used to obtain the displacement of the detection plate (650).

6. The telescopic arm device according to claim 5, characterized in that: The sensing assembly (700) comprises a position sensor (710), a screw (730) and a mounting plate (750); the mounting plate (750) is connected to a side of the telescopic rod (410) away from the chain (510) via the screw (730); the position sensor (710) is connected to the mounting plate (750); and the position of the position sensor (710) and the displacement path of the detection plate (650) at least partially overlap on a preset plane, and the preset plane is a plane perpendicular to the displacement path of the detection plate (650).

7. The telescopic arm device according to claim 1, characterized in that: The telescopic arm device (10) further comprises a second screw rod (513), and the chain (510) is connected to the three-section telescopic arm (300) via the second screw rod (513).

8. The telescopic arm device according to claim 1, characterized in that: The telescopic arm device (10) further comprises a first bolt and a second bolt, the basic arm (100) is provided with a first fixing seat (110), and the telescopic rod (410) is connected to the first fixing seat (110) via the first bolt; the two-section telescopic arm (200) is provided with a second fixing seat (130), and the cylinder (430) is connected to the second fixing seat (130) via the second bolt.

9. The telescopic arm device according to any one of claims 1 to 8, characterized in that: The chain (510), the sprocket assembly (530), the cylinder (430), and the telescopic rod (410) are integrated.

10. A fire truck, characterized in that: The fire truck comprises the telescopic arm device according to any one of claims 1 to 9.

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