Insulated boom and insulated bucket arm truck

Abstract

The application discloses an insulating telescopic arm and an insulating boom truck. The insulating telescopic arm comprises an outer arm, an insulating inner arm and a self-adjusting roller device. The insulating inner arm is limited in the outer arm and can move axially from the free end of the outer arm. The self-adjusting roller device comprises a pressure cylinder arranged on the outer arm, a piston rod capable of moving up and down in the pressure cylinder and a roller assembly for bearing the insulating inner arm. The number of the roller assemblies is at least two. Each roller assembly comprises a roller shaft and a roller body for bearing the insulating inner arm and rotatably sleeved on the outer side of the roller shaft. The piston rod is connected to both ends of the roller shaft. Since the force provided by the fluid medium in the pressure cylinder to each piston rod is equal, the force on the at least two roller assemblies is uniform, the wear rate is greatly reduced, and the service life and insulating performance of the insulating inner arm are improved.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery technology, specifically relating to an insulated telescopic boom and an insulated bucket boom vehicle. Background Technology

[0002] Insulated boom trucks are a type of high-altitude live-line working machinery. They are characterized by convenient lifting, high mobility, good stability, and strong insulation performance, making them highly favored by the power industry.

[0003] Existing insulated boom trucks mostly use a slider type for their insulated telescopic booms. This involves installing a nylon slider on the lower inner surface of the outer boom. During extension and retraction, the lower outer surface of the fiberglass inner boom contacts the nylon slider, creating a sliding motion and preventing direct contact between the fiberglass inner boom and the iron outer boom. However, nylon is prone to aging and is not wear-resistant. Even slight surface damage increases sliding friction resistance. Increased resistance indirectly leads to increased hydraulic system pressure, forcibly pushing the telescopic boom out. The friction between the fiberglass inner boom and the nylon slider can scratch the insulating coating on the fiberglass outer surface, reducing the insulation level of the fiberglass inner boom and creating safety hazards. Furthermore, higher system pressure causes the hydraulic oil temperature to rise rapidly, reducing its lifespan. It also impacts the sealing elements in the hydraulic system, increasing the likelihood of seal failure and oil leaks.

[0004] Chinese Patent 201120564104.7 discloses a rolling roller device for an insulating arm. This device includes a basic arm and an insulating telescopic arm confined within the basic arm. A rolling shaft is located below the insulating telescopic arm. This device can replace the traditional slider, generating rolling friction between the insulating telescopic arms, reducing the pressure on the hydraulic system and wear on the insulating arms. However, after replacing the slider with a rolling roller device, the contact area between the insulating telescopic arm and the rolling roller device is significantly reduced compared to the contact area between the insulating telescopic arm and the slider. However, the weight of the insulating telescopic arm, coupled with its higher rated load, leads to excessive pressure at the contact point between the insulating telescopic arm and the rolling roller device during extension and retraction. Although rolling friction reduces wear, the increased pressure still leads to increased wear.

[0005] Chinese Patent 201621407892.8 discloses a hybrid boom-type insulated aerial work platform telescopic boom roller mechanism. This mechanism uses two rollers installed side-by-side to form a single integral roller. As the fiberglass inner boom extends further and bends, the roller mechanism automatically adjusts to the bending of the inner boom, ensuring full contact between the inner boom and the roller mechanism for optimal rolling performance. However, this design only allows the two rollers to share the pressure, failing to guarantee even force distribution. This can easily lead to wear on the fiberglass inner boom, negatively impacting its service life and insulation performance. Summary of the Invention

[0006] To address the aforementioned defects or deficiencies, this invention provides an insulated telescopic boom and an insulated bucket truck, aiming to solve the technical problem in the prior art where two rollers are arranged side by side to form a single integral roller to share the pressure of the insulated inner boom, but this cannot guarantee that the two rollers are subjected to uniform force.

[0007] To achieve the above objectives, the present invention provides an insulated telescopic arm, wherein the insulated telescopic arm includes an outer arm, an insulated inner arm, and a self-adjusting roller device; the insulated inner arm is confined within the outer arm and can extend axially from the free end of the outer arm; the self-adjusting roller device includes a pressure cylinder disposed on the outer arm, a piston rod capable of vertical movement within the pressure cylinder, and a roller assembly for supporting the insulated inner arm, wherein there are at least two roller assemblies, and the roller assembly includes a roller shaft and a roller body rotatably fitted outside the roller shaft for supporting the insulated inner arm, wherein piston rods are correspondingly connected to both ends of the roller shaft extending beyond the roller body.

[0008] In an embodiment of the present invention, the pressure cylinder includes a cylinder body with a communicating space and a piston lifting part with a lifting channel. The cylinder body is provided with piston lifting parts at positions corresponding to both ends of the roller assembly, and the communicating space of the cylinder body is connected to the lifting channel of the piston lifting part. The piston rod includes a piston body placed in the lifting channel and a rod body connecting the piston body and the roller shaft.

[0009] In this embodiment of the invention, the piston rod is provided with a movable hole, and the self-adjusting roller device also includes a fixing nut. The roller shaft extends from both ends of the roller body and passes through the corresponding movable hole and fixing nut in sequence, and is threadedly connected to the fixing nut.

[0010] In this embodiment of the invention, the movable hole is formed with a movable clearance for the roller shaft to move up and down.

[0011] In this embodiment of the invention, the cross-section of the roller shaft is circular, and the movable hole is square.

[0012] In this embodiment of the invention, a bearing is provided between the roller shaft and the roller body.

[0013] In this embodiment of the invention, the lower side plate of the outer arm protrudes downward to form an installation space for accommodating the pressure cylinder.

[0014] In this embodiment of the invention, the insulated telescopic arm further includes a first limiting block, which is disposed on the inner wall of the outer arm and is used to abut against the upper side and the left and right sides of the insulated inner arm.

[0015] In this embodiment of the invention, the insulated telescopic arm further includes a second limiting block, which is disposed on the outer wall around the inner end of the insulated inner arm and is used to abut against the inner wall of the outer arm.

[0016] In this embodiment of the invention, there are multiple roller assemblies, each roller assembly extends along the width direction of the outer arm, and the multiple roller assemblies are arranged at intervals along the length direction of the outer arm.

[0017] To achieve the above objectives, the present invention also provides an insulated bucket truck, wherein the insulated bucket truck includes an insulated telescopic boom as described above.

[0018] Through the above technical solution, the insulated telescopic arm provided in the embodiments of the present invention has the following beneficial effects:

[0019] When using the aforementioned insulated telescopic arm, the self-adjusting roller device includes a pressure cylinder mounted on the outer arm, a piston rod that can move up and down within the pressure cylinder, and a roller assembly for supporting the insulated inner arm. There are at least two roller assemblies, meaning at least two roller assemblies can provide rolling support to the insulated inner arm during its telescopic operation. Each roller assembly includes a roller shaft and a roller body rotatably fitted around the outside of the roller shaft to support the insulated inner arm. Piston rods are connected to both ends of the roller shaft extending from the roller body, meaning each roller assembly has two piston rods to support both ends of the assembly. When the insulated inner arm bends at its free end extending from the outer arm, the piston rods at both ends of the at least two roller assemblies can move up and down within the pressure cylinder according to the bending of the insulated inner arm, achieving automatic adjustment and ensuring full contact between the at least two roller assemblies and the insulated inner arm, guaranteeing a smooth rolling effect. Furthermore, since the fluid medium within the pressure cylinder distributes equal force to each piston rod, the at least two roller assemblies are subjected to uniform force, significantly reducing wear and improving the service life and insulation performance of the insulated inner arm. Meanwhile, the insulated telescopic arm provided by this invention can also solve the technical problem of uneven force distribution at the left and right ends of the roller assembly.

[0020] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0021] The accompanying drawings are provided to illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of an insulated telescopic arm according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of a self-adjusting roller device from one perspective according to an embodiment of the present invention;

[0024] Figure 3This is a schematic diagram of the self-adjusting roller device from another perspective according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of a pressure cylinder according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the roller assembly and piston rod from one perspective according to an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the roller assembly and piston rod from another perspective according to an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the insulated inner arm and self-adjusting roller device according to an embodiment of the present invention;

[0029] Figure 8 This is a cross-sectional structural diagram of an insulated telescopic arm according to an embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram of the structure of an insulated telescopic arm according to another embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures

[0032] 1. Outer arm 11. Installation space

[0033] 12 First limiting block 2 Insulating inner arm

[0034] 21 Second limit block 3 Self-adjusting roller device

[0035] 31 Pressure Cylinder 311 Hydraulic Cylinder Main Body

[0036] 312 Piston lifting section; 313 Connecting space

[0037] 314 Lifting channel 32 Piston rod

[0038] 321 Piston body; 322 Rod body

[0039] 323 Movable hole; 324 Movable clearance

[0040] 33 Roller assembly 331 Roller shaft

[0041] 332 Drum body 34 Fixing nut Detailed Implementation

[0042] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0043] The insulating telescopic arm of the present invention is described below with reference to the accompanying drawings.

[0044] like Figure 1 and Figure 2 As shown, the present invention provides an insulated telescopic arm, wherein the insulated telescopic arm includes:

[0045] Outer arm 1;

[0046] An insulating inner arm 2 is confined within the outer arm 1 and can extend axially from the free end of the outer arm 1;

[0047] The self-adjusting roller device 3 includes a pressure cylinder 31 mounted on the outer arm 1, a piston rod 32 that can move up and down within the pressure cylinder 31, and a roller assembly 33 for supporting the insulating inner arm 2. The number of roller assemblies 33 is at least two, and the roller assembly 33 includes a roller shaft 331 and a roller body 332 for supporting the insulating inner arm 2 and rotatably sleeved on the outside of the roller shaft 331. The piston rod 32 is correspondingly connected to both ends of the roller shaft 331 that extend out of the roller body 332.

[0048] When using the aforementioned insulated telescopic arm, since the self-adjusting roller device 3 includes a pressure cylinder 31 mounted on the outer arm 1, a piston rod 32 that can move up and down within the pressure cylinder 31, and a roller assembly 33 for supporting the insulated inner arm 2, and the number of roller assemblies 33 is at least two, at least two roller assemblies 33 can respectively provide rolling support for the insulated inner arm 2 during the telescopic operation. Furthermore, the roller assembly 33 includes a roller shaft 331 and a roller body 332 for supporting the insulated inner arm 2 and rotatably fitted outside the roller shaft 331. Piston rods 32 are correspondingly connected to both ends of the roller shaft 331 extending beyond the roller body 332, that is, each roller assembly... Two piston rods 32 are connected to the roller assembly 33 to support both ends of the roller assembly 33. When the insulating inner arm 2 extends beyond the free end of the outer arm 1 and bends, the piston rods 32 at both ends of at least two roller assemblies 33 can move up and down within the pressure cylinder 31 according to the bending of the insulating inner arm 2, achieving automatic adjustment and ensuring full contact between at least two roller assemblies 33 and the insulating inner arm 2, guaranteeing a rolling effect. Furthermore, since the fluid medium within the pressure cylinder 31 distributes an equal force to each piston rod 32, it ensures uniform force distribution on at least two roller assemblies 33, greatly reducing wear and improving the service life and insulation performance of the insulating inner arm 2. Simultaneously, the insulating telescopic arm provided by this invention also solves the technical problem of uneven force distribution on the left and right ends of the roller assembly 33.

[0049] It should be noted that the number of roller assemblies 33 can be n (n ≥ 2). When the piston rods 32 at both ends of each roller assembly 33 are placed in the pressure cylinder 31, a hydraulic system with 2n piston rods 32 can be formed. According to Pascal's law in engineering fluid dynamics: when an external force causes a pressure increase at any point in an incompressible static fluid, this pressure increase is instantaneously transmitted to all points in the static fluid. That is, applying a certain pressure to one piston rod 32 in the hydraulic system will inevitably produce the same pressure increase on the remaining piston rods 32. This can be expressed by the formula: P1 = P2 = ... = P 2n That is, F1 / S1 = F2 / S2 = ... = F 2n / S 2n Since the working area of ​​the 2n piston rods 32 is the same, the force on each piston rod 32 is the same, which makes the force on at least two roller assemblies 33 uniform and the force on the left and right ends of each roller assembly 33 uniform.

[0050] Furthermore, the outer arm 1 in this invention can be either a metal outer arm or an insulated outer arm, depending on the specific circumstances. The pressure cylinder 31 in this invention can be a hydraulic cylinder or a pneumatic cylinder, and the fluid medium in the hydraulic cylinder can include, but is not limited to, hydraulic oil, while the fluid medium in the pneumatic cylinder can include, but is not limited to, air.

[0051] See Figure 2 and Figure 4In this embodiment of the invention, the pressure cylinder 31 includes a cylinder body 311 with a communicating space 313 and a piston lifting part 312 with a lifting channel 314. The cylinder body 311 is provided with piston lifting parts 312 at positions corresponding to both ends of the roller assembly 33. The communicating space 313 of the cylinder body 311 is connected to the lifting channel 314 of the piston lifting part 312. Since there are at least two roller assemblies 33, in order to correspond to both ends of each of the at least two roller assemblies 33, the cylinder body 311 should be provided with twice the number of piston lifting parts 312 as roller assemblies 33. The lifting channel 314 of each piston lifting part 312 is connected to the communicating space 313 of the cylinder body 311, so that the fluid medium in the communicating space 313 can be injected into each lifting channel 314 respectively. Meanwhile, the piston rod 32 includes a piston body 321 placed within the lifting channel 314 and a rod body 322 connecting the piston body 321 and the roller shaft 331. The piston body 321 is fitted against the peripheral wall of the lifting channel 314, and the rod body 322 extends from the end of the roller body 332, connecting to the roller shaft 331. That is, the piston body 321 can divide the lifting channel 314 into two parts. The lifting channel 314 below the piston body 321 is connected to the communicating space 313 and can be filled with fluid medium. The lifting channel 314 above the piston body 321 is sealed off from the communicating space 313, preventing fluid medium from entering the lifting channel 314 above the piston body 321. The lifting channel 314 ensures the stability of the piston rod 32's vertical movement. The communicating space 313 connects all the lifting channels 314, allowing each piston body 321 to receive the same force.

[0052] Specifically, when the number of roller assemblies 33 is n (n is greater than or equal to 2), the number of piston lifting parts 312 of pressure cylinder 31 is 2n, that is, the number of lifting channels 314 is 2n. The 2n lifting channels 314 can be connected through the communication space 313 of the cylinder body 311. The 2n piston lifting parts 312 are respectively set to correspond one-to-one with the two ends of the n roller assemblies 33. The piston bodies 321 of the 2n piston rods 32 are respectively placed in the 2n lifting channels 314, and are respectively connected to the end of the corresponding roller shaft 331 that extends out of the roller body 332 through the rod body 322.

[0053] See Figure 2 , Figure 3 and Figure 5In this embodiment of the invention, the piston rod 32 has a movable hole 323, and the self-adjusting roller device 3 also includes a fixing nut 34. The roller shaft 331 extends from both ends of the roller body 332, passes through the corresponding movable hole 323 and fixing nut 34 in sequence, and is threadedly connected to the fixing nut 34. That is, the piston rod 32 has a movable hole 323 for the roller shaft 331 to pass through, and one end of the roller shaft 331 passing through the movable hole 323 has an external thread section. The fixing nut 34 is fitted onto the external thread section to restrict the axial movement of the roller shaft 331. Each roller assembly 33 has a piston rod 32 and a fixing nut 34 at both ends of the roller shaft 331, so that both ends of the roller assembly 33 can be connected to two piston rods 32 respectively. Each piston rod 32 is detachably connected to the roller assembly 33 for easy maintenance.

[0054] like Figure 6 As shown, in this embodiment of the invention, the movable hole 323 forms a movable clearance 324 for the roller shaft 331 to move up and down. The piston rod 32 is connected to the roller shaft 331 through the movable hole 323, and the opening size of the movable hole 323 in the height direction is larger than the shaft diameter of the roller shaft 331, so that when the roller shaft 331 passes through the movable hole 323, the movable hole 323 leaves a movable clearance 324 for the roller shaft 331 to move up and down. Therefore, when the insulating inner arm 2 extends and generates a certain off-center load, the two ends of the roller shaft 331 can adaptively adjust within the corresponding movable hole 323. For details, please refer to [link to relevant documentation]. Figure 7 .

[0055] In this embodiment of the invention, the cross-section of the roller shaft 331 can be circular, and the movable hole 323 can be square. In order to form a movable clearance 324 for the roller shaft 331 to move up and down in the movable hole 323, the distance between the upper inner wall and the lower inner wall of the movable hole 323, which is a square hole, should be greater than the diameter of the circular cross-section of the roller shaft 331.

[0056] In this embodiment of the invention, a bearing may be provided between the roller shaft 331 and the roller body 332. This allows the roller body 332 to roll with minimal friction. Specifically, there are two bearings located at both ends of the inner side of the roller body 332, providing support for the roller body 332 from both ends.

[0057] Please see again Figure 1 In this embodiment of the invention, the lower side plate of the outer arm 1 protrudes downward to form an installation space 11 for accommodating the pressure cylinder 31, so as to minimize the size of the outer arm 1. Specifically, the outer arm 1 includes an upper side plate and a lower side plate arranged opposite each other, as well as a left side plate and a right side plate arranged opposite each other, and the installation space 11 can be located close to the free end of the outer arm 1.

[0058] See Figure 8 and Figure 9 In this embodiment of the invention, the insulated telescopic arm further includes a first limiting block 12, which is disposed on the inner wall of the outer arm 1 and abuts against the upper side and left and right sides of the insulated inner arm 2. That is, the first limiting block 12 disposed on the outer arm 1 cooperates with the self-adjusting roller device 3 to limit the insulated inner arm 2 from all four sides, so that the insulated inner arm 2 can be accurately centered during telescopic operation. Specifically, there can be three first limiting blocks 12, which are respectively disposed on the inner walls of the upper side plate, left side plate, and right side plate of the outer arm 1, corresponding to the self-adjusting roller device 3. Of course, the invention is not limited to this; the first limiting block 12 can also be an integral design, with the first limiting block 12 sequentially arranged on the inner walls of the left side plate, upper side plate, and right side plate of the outer arm 1. Further, the first limiting block 12 can be installed on the outer arm 1 using threaded fasteners, and the first limiting block 12 can be made of nylon or rubber.

[0059] like Figure 9 As shown, in this embodiment of the invention, the insulated telescopic arm further includes a second limiting block 21. The second limiting block 21 is disposed on the outer wall around the inner end of the insulated inner arm 2 and is used to abut against the inner wall of the outer arm 1. That is, the second limiting block 21 disposed on the insulated inner arm 2 can limit the insulated inner arm 2 from all sides at the inner end of the insulated inner arm 2, so as to further ensure that the insulated inner arm 2 can be accurately centered during the telescopic operation. Specifically, there can be four second limiting blocks 21, which are disposed on the outer wall around the inner end of the insulated inner arm 2 and respectively abut against the inner walls of the upper side plate, lower side plate, left side plate and right side plate of the outer arm 1. Of course, the invention is not limited to this. The second limiting block 21 can also be an integral design, and the second limiting block 21 can be disposed around the outer wall around the inner end of the insulated inner arm 2. It should be noted that the inner end of the insulating inner arm 2 is relative to the outer end. The outer end of the insulating inner arm 2 refers to the end that can extend beyond the free end of the outer arm 1, while the inner end of the insulating inner arm 2 is the end that cannot extend beyond the free end of the outer arm 1. Furthermore, the second limiting block 21 can be installed on the insulating inner arm 2 using threaded fasteners. The second limiting block 21 can be made of nylon or rubber. Additionally, when the outer arm 1 is an insulating outer arm, the second limiting block 21 located at the upper end of the outer arm can be replaced by a self-adjusting roller device 3 to reduce wear between the inner ends of the insulating outer arm and the insulating inner arm 2.

[0060] Please see again Figure 1 and Figure 2In this embodiment of the invention, there are multiple roller assemblies 33, each extending along the width direction of the outer arm 1, and the multiple roller assemblies 33 are arranged sequentially at intervals along the length direction of the outer arm 1. The number of roller assemblies 33 can be more than two, or even up to ten, and the specific number of roller assemblies 33 can be set according to actual needs. Since both ends of the multiple roller assemblies 33 can be connected to a piston rod 32 that can move up and down in the pressure cylinder 31, the multiple roller assemblies 33 are kept under uniform force. Furthermore, increasing the number of roller assemblies 33 can reduce the pressure evenly distributed on each roller assembly 33 in the insulating inner arm 2, thereby further reducing wear.

[0061] To achieve the above objectives, the present invention also provides an insulated bucket truck, characterized in that the insulated bucket truck includes an insulated telescopic boom as described above. Since the insulated bucket truck adopts all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0062] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0063] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0065] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An insulated telescopic arm, characterized in that, The insulated telescopic arm includes: Outer arm (1); An insulating inner arm (2) is confined within the outer arm (1) and can extend axially from the free end of the outer arm (1); The self-adjusting roller device (3) is located at the free end of the outer arm (1) and includes a pressure cylinder (31) disposed on the outer arm (1), a piston rod (32) that can move up and down in the pressure cylinder (31), and a roller assembly (33) for supporting the insulating inner arm (2). The number of roller assemblies (33) is at least two, and the roller assembly (33) includes a roller shaft (331) and a roller body (332) for supporting the insulating inner arm (2) and rotatably sleeved on the outside of the roller shaft (331). The piston rod (32) is correspondingly connected to both ends of the roller shaft (331) that extend out of the roller body (332). The piston rod (32) is provided with a movable hole (323), and the movable hole (323) forms an movable gap (324) for the roller shaft (331) to move up and down. The pressure cylinder (31) includes a cylinder body (311) with a communicating space (313) and a piston lifting part (312) with a lifting channel (314). The cylinder body (311) is provided with the piston lifting part (312) at positions corresponding to both ends of the roller assembly (33). The communicating space (313) is connected to the lifting channel (314) so ​​that after pressure is applied to any piston rod (32) located in the lifting channel (314), the remaining piston rod (32) will generate the same pressure increment.

2. The insulated telescopic arm according to claim 1, characterized in that, The piston rod (32) includes a piston body (321) placed in the lifting channel (314) and a rod body (322) connecting the piston body (321) and the roller shaft (331).

3. The insulated telescopic arm according to claim 1, characterized in that, The self-adjusting roller device (3) also includes a fixing nut (34). The roller shaft (331) extends from both ends of the roller body (332) and passes through the corresponding movable hole (323) and the fixing nut (34) in sequence, and is threadedly connected to the fixing nut (34).

4. The insulated telescopic arm according to claim 3, characterized in that, The cross-section of the roller shaft (331) is circular, and the movable hole (323) is square.

5. The insulated telescopic arm according to any one of claims 1 to 4, characterized in that, The lower side plate of the outer arm (1) protrudes downward to form an installation space (11) for accommodating the pressure cylinder (31).

6. The insulated telescopic arm according to any one of claims 1 to 4, characterized in that, The insulated telescopic arm also includes a first limiting block (12), which is disposed on the inner wall of the outer arm (1) and is used to abut against the upper side and the left and right sides of the insulated inner arm (2).

7. The insulated telescopic arm according to any one of claims 1 to 4, characterized in that, The insulated telescopic arm also includes a second limiting block (21), which is disposed on the outer wall around the inner end of the insulated inner arm (2) and is used to abut against the inner wall of the outer arm (1).

8. The insulated telescopic arm according to any one of claims 1 to 4, characterized in that, The number of roller assemblies (33) is multiple, each roller assembly (33) extends along the width direction of the outer arm (1), and the multiple roller assemblies (33) are arranged sequentially at intervals along the length direction of the outer arm (1).

9. An insulated bucket truck, characterized in that, The insulated bucket truck includes an insulated telescopic boom according to any one of claims 1 to 8.

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