Telescopic arm and telescopic arm forklift loader

Abstract

The utility model belongs to the technical field of hoisting equipment, and discloses a telescopic arm and a telescopic arm forklift loader. The supporting assembly of the telescopic arm comprises a bearing structure and a supporting structure, the first end of the bearing structure is fixedly connected to a cylinder body of the inner telescopic oil cylinder, the second end of the bearing structure is in sliding fit with the inner-layer knuckle arm, the first end of the supporting structure is fixedly connected to the outer-layer knuckle arm, and the second end of the supporting structure is in rolling fit with the bearing structure. When the inner telescopic oil cylinder and the outer telescopic oil cylinder stretch out and draw back synchronously, the position of the supporting structure is kept unchanged all the time, and the first end of the bearing structure is fixedly connected to a cylinder body of the inner telescopic oil cylinder and can stretch out and draw back relative to the outer knuckle arm along with the inner knuckle arm. And the bearing structure is in sliding fit with the inner layer structure, so that the friction force between the supporting structure and the bearing structure can be effectively reduced, the pipeline can be prevented from being clamped due to extension and retraction of the knuckle arm, and the flexibility of the telescopic arm is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting equipment, in particular to a telescopic arm and a telescopic arm forklift. Background Art

[0002] A telescopic forklift is a movable equipment widely used in various industries for aerial operations, material handling, palletizing, etc. It is generally composed of a chassis, a telescopic arm and work attachments.

[0003] When operating, a telescopic forklift uses the telescopic arm to adjust and extend the boom to place the work attachments in the corresponding working position to complete the corresponding work. During this process, corresponding pipelines are required to transport hydraulic oil to the work attachments to complete the related work. Due to limited space, a solution with one external cylinder and one internal cylinder is often adopted. Because accessories such as forks or buckets need to be installed in the front of the telescopic forklift, the height and width of the entire machine are very compact, and the oil source is required for the oil cylinder in the arm, it is necessary to lead the oil line from the chassis through the inside of the telescopic arm to the arm head attachment. The pipeline also needs to be able to extend and retract synchronously during extension and retraction. Telescopic forklifts need to frequently perform load-bearing and retracting operations, and high reliability requirements are placed on the retracting mechanism.

[0004] In the prior art, a tray is set inside the arm to hold the oil pipe, and a slide rail is set on the tray. The pipe and the mounting bracket can slide on the tray using the slide rail, so that the pipe can be extended and retracted inside the arm. In this structure, the pipes are all moved on the tray. The advantage is that all pipes and telescopic mechanisms are located in the three-section arm cylinder, which can be pulled out at one time during disassembly and assembly, which is relatively convenient for maintenance and has a low risk of pipe extrusion; there is no need for guide wheels and other structures, and the failure rate is relatively low; however, the slide rail structure on the tray is complex and requires high manufacturing precision, and the resistance is large when the pallet is extended and retracted synchronously with the working arm, which is prone to jamming problems.

[0005] Therefore, a telescopic arm and a telescopic arm forklift are needed to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a telescopic arm and a telescopic arm forklift, which can avoid the risk of displacement and extrusion caused by the movement of pipelines between the cylinders of two section arms, and effectively reduce the resistance of the support plate when the working arm is extended and retracted, which can effectively reduce the risk of jamming and improve the service life.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] The telescopic arm comprises a plurality of section arms, which are slidably connected in sequence from the outside to the inside. Two adjacent section arms are connected by a telescopic oil cylinder. The section arm located at the outermost layer is the outer section arm, and the section arm located at the innermost layer is the inner section arm. The telescopic oil cylinder for driving the inner section arm is the inner telescopic oil cylinder, and the inner telescopic oil cylinder is located in the inner cavity of the inner section arm. The telescopic arm further comprises:

[0009] A support assembly, the support assembly comprising a supporting structure and a supporting structure, wherein the first end of the supporting structure is fixedly connected to the cylinder body of the inner telescopic cylinder, the second end of the supporting structure is in sliding engagement with the inner segment arm, the first end of the supporting structure is fixedly connected to the outer segment arm, the second end of the supporting structure is in rolling engagement with the supporting structure;

[0010] A liquid inlet pipeline is fixedly connected to the first end of the support structure, the first end of the liquid inlet pipeline is used to connect to an external oil source, and at least a portion of the liquid inlet pipeline is supported by the support structure.

[0011] As an optional technical solution, the support structure includes a support frame and a roller, the first end of the support frame is fixedly connected to the outer segment arm, and the roller is installed on the second end of the support frame.

[0012] As an optional technical solution, the supporting structure includes a supporting plate, a limiting plate and a slider. The slider is fixedly arranged on the end face of the supporting plate away from the inner telescopic cylinder. The limiting plate is arranged on the end face of the supporting plate close to the inner telescopic cylinder. The limiting plate has a limiting groove, and the roller is arranged to roll in the limiting groove.

[0013] As an optional technical solution, the supporting structure further includes a partition, which is installed on the end surface of the supporting plate close to the inner telescopic cylinder, and the partition is spaced apart from the limit plate to form a pipeline channel.

[0014] As an optional technical solution, the supporting plate is a U-shaped plate, and the limiting plate is an L-shaped plate.

[0015] As an optional technical solution, the telescopic arm also includes a first pipeline, a second pipeline and a third pipeline. The first end of the first pipeline is connected to the second end of the liquid inlet pipeline, and the second end of the first pipeline is connected to the inner telescopic cylinder; the first end of the second pipeline is fixedly installed on the inner section arm, and the second end of the second pipeline is used to supply oil to the working accessories; the first end of the third pipeline is connected to the second end of the liquid inlet pipeline, and the third pipeline is connected to the first end of the second pipeline after bypassing the first end of the inner telescopic cylinder, and at least part of the third pipeline is supported by the supporting structure.

[0016] As an optional technical solution, the telescopic arm further includes a bearing plate, which is fixedly mounted on the outer wall of the inner telescopic cylinder, and at least a portion of the third pipeline is supported by the bearing plate.

[0017] As an optional technical solution, the telescopic arm further includes an extension plate, which is fixedly connected to the inner segment arm, and the extension plate and the inner segment arm form an extension channel, and the second pipeline is arranged in the extension channel.

[0018] As an optional technical solution, the liquid inlet pipeline is a hard pipeline.

[0019] The utility model also adopts the following technical solutions:

[0020] A telescopic forklift truck comprising a telescopic arm as described above.

[0021] Beneficial effects of the utility model:

[0022] The utility model discloses a telescopic arm, wherein the first end of the supporting structure of the telescopic arm is fixedly connected to the cylinder body of the inner telescopic oil cylinder, and the second end is in sliding cooperation with the inner segment arm. The first end of the supporting structure is fixedly connected to the outer segment arm, and the second end is in rolling cooperation with the supporting structure. In actual use, when the inner telescopic oil cylinder and the outer telescopic oil cylinder are synchronously extended and retracted, the position of the supporting structure always remains unchanged, ensuring the stability of the liquid inlet pipeline fixedly connected thereto, and the first end of the supporting structure is fixedly connected to the cylinder body of the inner telescopic cylinder, and can be extended and retracted with the inner segment arm relative to the outer segment arm. Since the second end of the supporting structure is in rolling cooperation with the supporting structure, and the supporting structure and the inner segment arm are in sliding cooperation, the friction between the supporting structure and the supporting structure can be effectively reduced, and at least part of the liquid inlet pipeline is carried by the supporting structure, and at least part of the third pipeline is carried by the supporting structure, so as to avoid the pipeline from being stuck due to the extension and retraction of the segment arm, thereby improving the flexibility of the telescopic arm.

[0023] The utility model also discloses a telescopic forklift, which includes the telescopic arm as described above. The telescopic arm of the telescopic forklift avoids the displacement and extrusion of the pipeline caused by the movement between the two arm sections, and effectively reduces the resistance of the support plate when the working arm is extended and retracted, which can reduce the risk of jamming, has a long service life, and is easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of a telescopic arm (including pipelines) according to an embodiment of the present invention;

[0025] Figure 2 yes Figure 1 Cross-sectional view of AA;

[0026] Figure 3 yes Figure 1 Cross-sectional view of the middle BB;

[0027] Figure 4 It is a structural schematic diagram of the telescopic arm (excluding pipelines) of an embodiment of the utility model.

[0028] In the picture:

[0029] 1. Inner boom; 2. Outer boom; 3. Inner telescopic cylinder; 4. Outer telescopic cylinder; 5. Middle boom;

[0030] 11. Support structure; 111. Support plate; 112. Limit plate; 113. Slider; 114. Separator; 12. Support structure; 121. Support frame; 122. Roller;

[0031] 20. Liquid inlet pipeline;

[0032] 30. First pipeline;

[0033] 40. Second pipeline;

[0034] 50. The third pipeline;

[0035] 60. Loading plate;

[0036] 70. Extension plate; 71. Extension channel. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0038] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0039] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0041] like Figures 1 to 4 As shown, a telescopic arm is provided in this embodiment, which includes a plurality of joint arms, which are slidably connected in sequence from the outside to the inside, and two adjacent joint arms are connected by a telescopic oil cylinder. The joint arm located in the outermost layer is the outer joint arm 2, and the joint arm located in the innermost layer is the inner joint arm 1. The telescopic oil cylinder for driving the inner joint arm 1 is the inner telescopic oil cylinder 3, and the inner telescopic oil cylinder 3 is located in the inner cavity of the inner joint arm 1. The telescopic arm also includes a support assembly, a liquid inlet pipeline 20, a first pipeline 30, a second pipeline 40 and a third pipeline 50. The support assembly includes a supporting structure 11 and a supporting structure 12. The first end of the supporting structure 11 is fixedly connected to the cylinder body of the inner telescopic cylinder 3, and the second end of the supporting structure 11 is in sliding cooperation with the inner segment arm 1. The first end of the supporting structure 12 is fixedly connected to the outer segment arm 2, and the second end of the supporting structure 12 is in rolling cooperation with the supporting structure 11; the liquid inlet pipeline 20 is fixedly connected to the support structure 12, and the first end of the liquid inlet pipeline 20 is used to connect to an external oil source, and at least part of the liquid inlet pipeline 20 is carried by the support structure 12.

[0042] Specifically, in this embodiment, please refer to Figure 1 and Figure 4The telescopic arm includes three sections, namely the inner section arm 1, the outer section arm 2 and the middle section arm 5, and also includes an outer telescopic oil cylinder 4. The cylinder body of the outer telescopic oil cylinder 4 is installed on the outer wall of the outer section arm 2, the telescopic rod of the outer telescopic oil cylinder 4 is fixedly connected to the middle section arm 5, the cylinder body of the inner telescopic oil cylinder 3 is fixedly connected to the middle section arm 5, the telescopic rod of the inner telescopic oil cylinder 3 is connected to the inner section arm 1, the inner telescopic oil cylinder 3 and the outer telescopic oil cylinder 4 are synchronously extended and retracted, so that the telescopic arm extends or retracts; the first end of the supporting structure 11 is fixedly connected to the cylinder body of the inner telescopic oil cylinder 3, and can move synchronously with the inner telescopic oil cylinder 3, while the second end is slidingly matched with the inner section arm 1, the first end of the supporting structure 12 is fixedly connected to the outer section arm 2, and its position remains unchanged during the extension and retraction of the telescopic arm, and the second end is rolling matched with the supporting structure 11. When the inner telescopic oil cylinder 3 and the outer telescopic oil cylinder 4 are extended and retracted, the inner section arm 1 extends and retracts relative to the middle section arm 5, and the first end of the supporting structure 11 is fixedly connected to the inner telescopic oil cylinder 3 The cylinder body makes the second end of the supporting structure 11 need to slide relative to the inner segment arm 1, and the middle segment arm 5 telescopes relative to the outer segment arm 2. The first end of the supporting structure 12 is fixed to the outer segment arm 2, so that the second end of the supporting structure 12 needs to roll relative to the supporting structure 11. During the telescopic process, the second end of the supporting structure 12 that needs to move relative to the supporting structure 11 rolls relative to the supporting structure 11, which can reduce the friction between the supporting structure 12 and the supporting structure 11, thereby reducing the resistance during the telescopic arm's telescopic process, effectively reducing wear and improving service life, and at least part of the liquid inlet pipeline 20 is carried on the supporting structure 12, so that the liquid inlet pipeline 20 can move synchronously with the support structure 12, and at least part of the third pipeline 50 is carried on the supporting structure 11, so that part of the third pipeline 50 can move synchronously with the supporting structure 11, which not only effectively reduces the wear of the pipeline, but also effectively avoids the problem of jamming during the movement of the pipeline, thereby ensuring the normal function of the telescopic arm.

[0043] Furthermore, the telescopic arm also includes a first pipeline 30, a second pipeline 40 and a third pipeline 50. The first end of the first pipeline 30 is connected to the second end of the liquid inlet pipeline 20, and the second end of the first pipeline 30 is connected to the inner telescopic cylinder 3; one end of the second pipeline 40 is fixedly installed at the tail of the inner section arm 1, and the other end of the second pipeline 40 extends to the head of the inner section arm 1 to supply oil to the working accessories; the first end of the third pipeline 50 is connected to the second end of the liquid inlet pipeline 20, and the third pipeline 50 is connected to the first end of the second pipeline 40 after bypassing the first end of the inner telescopic cylinder 3, and at least part of the third pipeline 50 is supported by the supporting structure 11. Specifically, in this embodiment, the first end of the liquid inlet pipeline 20 is used to connect to an external oil source, and the two ends of the first pipeline 30 are respectively connected to the second end of the liquid inlet pipeline 20 and the inner telescopic cylinder 3, for supplying oil to the inner telescopic cylinder 3; the two ends of the third pipeline 50 are respectively connected to the second end of the liquid inlet pipeline 20 and one end of the second pipeline 40, and the other end of the second pipeline 40 is connected to the working attachment, for supplying oil to the working attachment to ensure the normal operation of the telescopic arm.

[0044] Further, if Figure 3 As shown, the support structure 12 includes a support frame 121 and a roller 122. The first end of the support frame 121 is fixedly connected to the outer segment arm 2, and the roller 122 is installed at the second end of the support frame 121. Specifically, in this embodiment, the roller 122 is installed at the second end of the support frame 121, which can not only effectively ensure that the support frame 121 supports the liquid inlet pipeline 20, but also ensure that the roller 122 and the supporting structure 11 can roll relative to each other, thereby reducing friction and improving flexibility and smoothness.

[0045] Specifically, in this embodiment, two support structures 12 are provided, and the two support structures 12 are arranged opposite to each other. In this embodiment, two groups of liquid inlet pipelines 20 are provided, and the two groups of liquid inlet pipelines 20 are respectively arranged in the space formed by the two support frames 121 and the inner telescopic cylinder 3. This arrangement can achieve a better accommodation effect for all liquid inlet pipelines 20, reduce the friction between the two adjacent liquid inlet pipelines 20, and make the weight distribution of the telescopic arm more balanced, avoiding unstable gravity of the telescopic arm.

[0046] For further information, please refer to Figure 3The supporting structure 11 includes a supporting plate 111, a limiting plate 112 and a slider 113. The slider 113 is fixedly arranged on the end surface of the supporting plate 111 away from the inner telescopic cylinder 3. The limiting plate 112 is installed on the end surface of the supporting plate 111 close to the inner telescopic cylinder 3. The limiting plate 112 has a limiting groove, and the roller 122 is rotatably arranged in the limiting groove. Specifically, in this embodiment, the limit plate 112 is arranged on the end surface of the supporting plate 111 close to the inner telescopic cylinder 3, which can improve the mechanical strength of the supporting plate 111 and avoid deformation of the supporting structure 11, and the limit plate 112 has a limit groove, and the roller 122 is arranged to roll in the limit groove. The limit groove can have a certain guiding effect on the roller 122, avoiding position offset during the rolling process of the roller 122, thereby avoiding misalignment of the supporting structure 11 and the supporting structure 12, improving the smoothness of the telescopic arm, and avoiding jamming and poor telescopic movement. The slider 113 is arranged on the end surface of the supporting plate 111 away from the inner telescopic cylinder 3, and is used to slide with the inner wall of the inner section arm 1, which can ensure the reliability of the relative movement between the second end of the supporting structure 11 and the inner section arm 1.

[0047] Specifically, in this embodiment, two limiting plates 112 are provided, and the two limiting grooves of the two limiting plates 112 and the rollers 122 provided on the two support frames 121 are provided correspondingly, thereby further improving the stability of the relative position between the supporting structure 12 and the supporting structure 11, and improving the stability of the telescopic arm.

[0048] For further information, please refer to Figure 2 The support structure 11 further includes a separator 114 mounted on the end surface of the support plate 111 near the inner telescopic cylinder 3. The separator 114 is spaced apart from the limit plate 112 to form a pipeline passage. Specifically, in this embodiment, the first pipeline 30 is accommodated in the pipeline passage formed by the separation between the separator 114 and the limit plate 112, ensuring good containment of the first pipeline 30 and reducing wear on the first pipeline 30.

[0049] Specifically, in this embodiment, the partition 114 is arranged between the two limit plates 112, and forms the pipeline channel with the two limit plates 112. Two groups of first pipelines 30 are also provided, and the two groups of first pipelines 30 are respectively arranged in the two pipeline channels to avoid mutual friction between the two groups of first pipelines 30 and reduce wear.

[0050] Furthermore, the supporting plate 111 is a U-shaped plate, and the limiting plate 112 is an L-shaped plate. Specifically, in this embodiment, the supporting plate 111 is a U-shaped plate, and the limiting plate 112 is an L-shaped plate. The limiting plate 112 is invertedly arranged on the supporting plate 111. The two limiting plates 112 are symmetrically arranged on the supporting plate 111, which can not only ensure that the supporting structure 11 has good mechanical strength, but also limit the roller 122 within the closed space formed by the limiting plates 112 and the supporting plate 111, thereby preventing the roller 122 from being offset.

[0051] Optionally, in this embodiment, the partition 114 is also a U-shaped plate, and the partition 114 is invertedly arranged on the support plate 111, which can ensure the strength of the pipeline channel and avoid deformation. This arrangement can also avoid sharp edges and wear on the first pipeline 30, thereby ensuring the service life of the first pipeline 30.

[0052] For further information, please refer to Figure 2 and Figure 3 The telescopic arm further includes a support plate 60, which is fixedly mounted on the outer wall of the inner telescopic cylinder 3. At least a portion of the third pipeline 50 is supported on the support plate 60. Specifically, in this embodiment, the support plate 60 is disposed on the outer wall of the inner telescopic cylinder 3, and at least a portion of the third pipeline 50 is supported on the support plate 60. When the telescopic arm is extended or retracted, the third pipeline 50 can move along the support plate 60, which not only prevents the third pipeline 50 from bending, but also ensures smooth movement of the third pipeline 50, preventing it from getting stuck and improving the performance of the telescopic arm.

[0053] For further information, please refer to Figure 2 、 Figure 3 and Figure 4 The telescopic boom further includes an extension plate 70, which is fixedly connected to the inner boom section 1. The extension plate 70 and the inner boom section 1 form an extension channel 71, and the second pipeline 40 is disposed in the extension channel 71. Specifically, in this embodiment, the extension plate 70 and the inner boom section 1 are fixedly connected to form the extension channel 71, and the second pipeline 40 is disposed in the extension channel 71. This arrangement allows the second pipeline 40 to be independently disposed, preventing friction between the second pipeline 40 and other components when the telescopic boom is extended or retracted, thereby extending the service life of the second pipeline 40 and ensuring the reliability of the second pipeline 40 in supplying oil to the attachment.

[0054] Furthermore, the liquid inlet pipeline 20 is a rigid pipeline. Specifically, in this embodiment, the liquid inlet pipeline 20 is a rigid pipeline, specifically a steel pipe, to ensure long service life and reduce wear. This embodiment also provides a telescopic forklift, comprising the telescopic arm described above. The telescopic arm of this telescopic forklift avoids displacement and compression of pipelines caused by movement between the two sections of the arm, effectively reduces resistance to the pallet as the working arm extends and retracts, reduces the risk of jamming, and provides a long service life and easy maintenance.

[0055] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A telescopic arm, comprising a plurality of section arms, wherein the plurality of section arms are sequentially slidably connected from the outside to the inside, and two adjacent section arms are connected by a telescopic oil cylinder. The section arm located in the innermost layer is an inner section arm (1), and the section arm located in the outermost layer is an outer section arm (2). The telescopic oil cylinder for driving the inner section arm (1) is an inner telescopic oil cylinder (3), characterized in that: The inner telescopic oil cylinder (3) is located in the inner cavity of the inner segment arm (1), and the telescopic arm further comprises: A support assembly, the support assembly comprising a supporting structure (11) and a supporting structure (12), wherein the first end of the supporting structure (11) is fixedly connected to the cylinder body of the inner telescopic oil cylinder (3), the second end of the supporting structure (11) is in sliding engagement with the inner layer segment arm (1), the first end of the supporting structure (12) is fixedly connected to the outer layer segment arm (2), and the second end of the supporting structure (12) is in rolling engagement with the supporting structure (11); A liquid inlet pipeline (20) is fixedly connected to a first end of the support structure (12), the first end of the liquid inlet pipeline (20) is used to connect to an external oil source, and at least a portion of the liquid inlet pipeline (20) is supported by the support structure (12).

2. The telescopic arm according to claim 1, characterized in that: The support structure (12) comprises a support frame (121) and a roller (122), wherein a first end of the support frame (121) is fixedly connected to the outer segment arm (2), and the roller (122) is installed on a second end of the support frame (121).

3. The telescopic arm according to claim 2, characterized in that: The supporting structure (11) comprises a supporting plate (111), a limiting plate (112) and a sliding block (113); the sliding block (113) is fixedly arranged on the end surface of the supporting plate (111) away from the inner telescopic oil cylinder (3); the limiting plate (112) is arranged on the end surface of the supporting plate (111) close to the inner telescopic oil cylinder (3); the limiting plate (112) has a limiting groove, and the roller (122) is rollingly arranged in the limiting groove.

4. The telescopic arm according to claim 3, characterized in that: The supporting structure (11) further comprises a separator (114), the separator (114) being mounted on the end surface of the supporting plate (111) close to the inner telescopic oil cylinder (3), and the separator (114) and the limiting plate (112) being spaced apart to form a pipeline channel.

5. The telescopic arm according to claim 4, characterized in that: The supporting plate (111) is a U-shaped plate, and the limiting plate (112) is an L-shaped plate.

6. The telescopic arm according to any one of claims 1 to 5, characterized in that: The telescopic arm further comprises a first pipeline (30), a second pipeline (40) and a third pipeline (50), wherein the first end of the first pipeline (30) is connected to the second end of the liquid inlet pipeline (20), and the second end of the first pipeline (30) is connected to the inner telescopic oil cylinder (3); the first end of the second pipeline (40) is fixedly mounted on the inner segment arm (1), and the second end of the second pipeline (40) is used to supply oil to the working attachment; the first end of the third pipeline (50) is connected to the second end of the liquid inlet pipeline (20), and the third pipeline (50) is connected to the first end of the second pipeline (40) after bypassing the first end of the inner telescopic oil cylinder (3), and at least a portion of the third pipeline (50) is supported by the supporting structure (11).

7. The telescopic arm according to claim 6, characterized in that: The telescopic arm further comprises a bearing plate (60), the bearing plate (60) being fixedly mounted on the outer wall of the inner telescopic oil cylinder (3), and at least a portion of the third pipeline (50) being supported on the bearing plate (60).

8. The telescopic arm according to claim 6, characterized in that: The telescopic arm further comprises an extension plate (70), the extension plate (70) being fixedly connected to the inner layer segment arm (1), and the extension plate (70) and the inner layer segment arm (1) forming an extension channel (71), and the second pipeline (40) being arranged in the extension channel (71).

9. The telescopic arm according to claim 6, characterized in that: The liquid inlet pipeline (20) is a hard pipeline.

10. Telescopic forklift, characterized in that: The telescopic forklift comprises a telescopic arm according to any one of claims 1 to 9.

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