Sliding connection device for telescopic boom of insulated boom truck

Abstract

The invention discloses a sliding connection device for a telescopic arm of an insulated boom truck, and aims to solve the problems that the overall performance is affected by abrasion of a sliding block, replacement and maintenance are difficult and the overall strength is crossed in a traditional structure. The device comprises an arm cylinder, an insulating inner arm and a sliding assembly, wherein the arm cylinder is connected with the insulating inner arm through the sliding assembly; the sliding assembly comprises a base, an adjusting bolt and a sliding block, the base is fixedly connected with the inner wall of the arm barrel, the sliding block is connected with the base, the sliding block is slidably connected with the outer side of the insulating inner arm, the adjusting bolt penetrates through the arm barrel and the base, and the adjusting bolt is used for adjusting the sliding connection strength of the sliding block and the insulating inner arm on the outer side of the arm barrel. The sliding assembly is arranged to be of a split structure of the base and the sliding block, and the connecting strength of the sliding block and the insulating inner arm can be adjusted through the adjusting bolt. The adjusting bolt is located on the outer side of the arm barrel, direct adjustment can be achieved without disassembling the arm barrel or the sliding assembly, and the adjusting process is greatly simplified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering machinery, in particular to a sliding connecting device of an insulating boom truck telescopic arm. BACKGROUND

[0002] As the core special vehicle for live-line work, the insulating boom truck is usually composed of inner and outer telescopic arms. This design feature requires the insulating inner arm to have excellent wear resistance and insulation. As a key functional component for connecting the inner and outer arms, the sliding block needs to meet the technical standards of high wear resistance, compression strength and moderate softness. In actual work scenarios, as the cumulative work time increases, the wear of the sliding block will cause the fitting precision of the sliding block and the arm cylinder to fail, directly affecting the torsion resistance of the insulating inner arm. Traditional maintenance methods, such as replacing the sliding block or adding adjustment shims, require the removal of the sliding block assembly, which is complicated and tedious to operate. In addition, as the working height of the boom truck continues to increase, the mechanical strength requirement of the sliding block increases significantly. The traditional bolt fixing method is prone to loosening and even shearing fracture of the bolts due to the high shear load they need to bear. When the cross-sectional size of the arm cylinder increases, the thick sliding block is prone to structural deformation under the pressure of the arm support, and the increased use of large-size sliding blocks will further increase the cost. SUMMARY

[0003] (I) Invention purpose

[0004] The purpose of the present application is to provide a sliding connecting device of an insulating boom truck telescopic arm, which aims to solve the problems of the traditional structure, such as the influence of sliding block wear on overall performance, the difficulty of replacement and maintenance, and the cross of overall strength.

[0005] (II) Technical solution

[0006] To solve the above problems, the present application provides a sliding connecting device of an insulating boom truck telescopic arm, which comprises an arm cylinder, an insulating inner arm and a sliding assembly, the arm cylinder and the insulating inner arm are connected through the sliding assembly;

[0007] The sliding assembly comprises a base, an adjusting bolt and a sliding block, the base is fixedly connected with the inner wall of the arm cylinder, the sliding block is connected with the base, the sliding block is slidably connected with the outer side of the insulating inner arm, the adjusting bolt passes through the arm cylinder and the base, and the adjusting bolt is used to adjust the sliding connection strength of the sliding block and the insulating inner arm on the outer side of the arm cylinder.

[0008] Preferably, the sliding assembly further comprises a buffer plate and a fixing bolt, the buffer plate is in contact with the sliding block and is connected through the fixing bolt, the buffer plate is connected with the base, and the adjusting bolt abuts against the buffer plate.

[0009] Preferably, the base is formed with a mounting groove, the buffer block is arranged in the mounting groove, and the peripheral side of the buffer block abuts against the side wall of the mounting groove.

[0010] Preferably, the mounting groove has a depth greater than the thickness of the buffer block, the side of the sliding block abutting against the buffer block is located in the mounting groove, and the peripheral side of the sliding block abuts against the side wall of the mounting groove.

[0011] Preferably, the bottom of the mounting groove is formed with a limiting hole, and the end of the fixing bolt is located in the limiting hole.

[0012] Preferably, a plurality of sliding assemblies are arranged between the arm barrel and the insulating inner arm, and the plurality of sliding assemblies are arranged on the inner side of the end of the arm barrel and uniformly arranged along the peripheral side of the insulating inner arm.

[0013] Preferably, the device further comprises a dustproof plate connected with two adjacent sliding assemblies, and the dustproof plate abuts against the peripheral side of the insulating inner arm.

[0014] Preferably, a first mounting hole is formed on the base, a second mounting hole is formed on the dustproof plate, and the first mounting hole and the second mounting hole are connected by a bolt.

[0015] Preferably, the device further comprises a reinforcing plate connected with the dustproof plate, and the reinforcing plate does not contact the insulating inner arm.

[0016] Preferably, the dustproof plate is made of a flexible material.

[0017] (III) Beneficial effects

[0018] The above technical solutions of the present application have the following beneficial technical effects:

[0019] 1. The sliding assembly is arranged in a split structure of the base and the sliding block, the connecting strength between the sliding block and the insulating inner arm can be adjusted by adjusting the bolt, the adjusting bolt is located on the outer side of the arm barrel, and the adjusting process is greatly simplified without disassembling the arm barrel or the sliding assembly. For example, if the insulating inner arm is found to be stuck or obviously loose during operation, the adjusting bolt can be directly adjusted on the outer side of the arm barrel to reduce or increase the pressure between the sliding block and the insulating inner arm, without stopping and disassembling, thereby improving the maintenance and operation efficiency.

[0020] 2. The sliding block and the insulating inner arm are in sliding contact, rather than the insulating inner arm directly contacting the arm barrel, thereby reducing the wear on the outer side of the insulating inner arm, ensuring the insulation performance of the insulating inner arm, ensuring the overall strength of the telescopic arm, and prolonging the service life of the insulating inner arm.

[0021] 3. By adjusting the bolts, the sliding strength of the sliding block and the insulating inner arm can be flexibly adjusted according to the operating load, for example, when the load is large, the adjusting bolts are tightened, the adjusting bolts press the sliding block, the pressure between the sliding block and the insulating inner arm is increased, the insulating inner arm is prevented from shaking, and the stability in the large load operating state is ensured; when the load is small, the pressure is adjusted small, the wear of the insulating inner arm is reduced, excessive wear or insufficient stability caused by single pressure adaptation to all scenes is avoided, and the adaptation ability of the telescopic arm to the use scene is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural explosion schematic diagram of a telescopic arm sliding connection device of an insulating boom truck provided by the application;

[0023] Figure 2 is a structural explosion schematic diagram of a sliding assembly in the device provided by the application;

[0024] Figure 3 is a front view schematic diagram of a sliding assembly in the device provided by the application;

[0025] Figure 4 is Figure 3 A-A sectional view in the figure;

[0026] Figure 5 is a split schematic diagram of a dustproof plate and a reinforcing plate in the device provided by the application;

[0027] Figure 6 is Figure 5 a schematic enlarged view of part B in the figure;

[0028] Figure 7 is a whole structure schematic diagram of a telescopic arm sliding connection device of an insulating boom truck provided by the application;

[0029] Figure 8 is Figure 7 a schematic enlarged view of part C in the figure.

[0030] Reference signs:

[0031] 1. Arm barrel;

[0032] 2. Insulating inner arm;

[0033] 3. Sliding assembly;

[0034] 31. Base; 31a, mounting groove; 31b, limiting hole; 31c, first mounting hole;

[0035] 32. Adjusting bolt; 33, sliding block; 34, buffer plate; 35, fixing bolt;

[0036] 4. Dustproof plate; 4a, second mounting hole;

[0037] 5. Reinforcing plate. DETAILED DESCRIPTION

[0038] The objects, technical solutions and advantages of the present application will become more apparent after a reading of the following detailed description together with the attached drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of well-known structures and techniques has been omitted to avoid unnecessary confusion of the concept of the present application.

[0039] The schematic diagrams of layer structures according to embodiments of the present application are shown in the drawings. These diagrams are not drawn to scale, in which certain details are exaggerated for clarity and certain details are omitted. The shapes of various regions, layers and their relative sizes and positional relationships shown in the diagrams are exemplary only, and in practice there can be deviations due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes and relative positions can be additionally designed by those skilled in the art according to actual needs.

[0040] Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0041] In the description of the present application, it should be noted that the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0042] In combination Figures 1 to 8 , the present application provides a sliding connection device for an insulated boom truck telescopic arm, comprising an arm cylinder 1, an insulated inner arm 2 and a sliding assembly 3, the arm cylinder 1 and the insulated inner arm 2 are connected through the sliding assembly 3; the sliding assembly 3 comprises a base 31, an adjusting bolt 32 and a sliding block 33, the base 31 is fixedly connected with the inner wall of the arm cylinder 1, the sliding block 33 is connected with the base 31, the sliding block 33 is slidingly connected with the outer side of the insulated inner arm 2, the adjusting bolt 32 passes through the arm cylinder 1 and the base 31, and the adjusting bolt 32 is used to adjust the sliding connection strength of the sliding block 33 and the insulated inner arm 2 on the outer side of the arm cylinder 1.

[0043] Specifically, the arm barrel 1 provides an extension space for the insulated inner arm 2 as an external support carrier of the overall structure, and provides a fixed mounting base for the sliding assembly 3, which bears the weight and force of the sliding assembly 3 during work; the insulated inner arm 2 is a telescopic component that can move axially in the arm barrel 1 to adjust the range of overhead work, and the outer side of the insulated inner arm 2 is in direct contact with the sliding block 33, so that the insulated inner arm 2 and the arm barrel 1 can be telescopically connected; the base 31 in the sliding assembly 3 is an intermediate carrier connecting the arm barrel 1 and the sliding block 33, one end of which is fixed to the inner wall of the arm barrel 1, and the other end provides mounting and limiting space for the sliding block 33, which transmits the force of the sliding block 33 to the arm barrel 1, avoiding direct hard contact of the sliding block 33 with the inner wall of the arm barrel 1; the adjusting bolt 32 pushes the sliding block 33 closer to the insulated inner arm 2 by moving axially, thereby adjusting the contact pressure between the sliding block 33 and the insulated inner arm 2; the sliding block 33 is in direct contact with the outer side of the insulated inner arm 2, bearing the sliding friction of the insulated inner arm 2 during extension and retraction, and transmitting the force of the insulated inner arm 2 to the arm barrel 1 through the base 31, avoiding direct friction and damage between the insulated inner arm 2 and the arm barrel 1. During operation of the telescopic arm, the base 31 is fixed to the inner wall of the arm barrel 1, the sliding block 33 is mounted on the base 31 and in contact with the outer side of the insulated inner arm 2, forming a sliding fit; when the sliding connection strength needs to be adjusted, the adjusting bolt 32 is rotated on the outside of the arm barrel 1, the adjusting bolt 32 moves axially and applies pressure or reduces pressure to the sliding block 33, thereby changing the contact friction between the sliding block 33 and the insulated inner arm 2, and finally achieving adjustment of the tightness of the insulated inner arm 2 during extension and retraction.

[0044] By such an arrangement, the sliding assembly 3 is arranged in a split structure of the base 31 and the sliding block 33, and the connection strength between the sliding block 33 and the insulated inner arm 2 can be adjusted by the adjusting bolt 32; the adjusting bolt 32 is located on the outside of the arm barrel 1, so it can be directly adjusted without disassembling the arm barrel 1 or the sliding assembly 3, greatly simplifying the adjustment process. For example, if the insulated inner arm 2 is found to be stuck or significantly loose during work, the adjusting bolt 32 can be directly turned on the outside of the arm barrel 1 to reduce or increase the pressure between the sliding block 33 and the insulated inner arm 2, without the need to stop and disassemble, improving maintenance and work efficiency. By sliding contact between the sliding block 33 and the insulated inner arm 2, rather than direct contact between the insulated inner arm 2 and the arm barrel 1, the wear on the outer side of the insulated inner arm 2 is reduced, the insulation performance of the insulated inner arm 2 is ensured, the overall strength of the telescopic arm is ensured, and the service life of the insulated inner arm 2 is prolonged. By the adjusting bolt 32, the sliding strength between the sliding block 33 and the insulated inner arm 2 can be flexibly adjusted according to the work load, such as tightening the adjusting bolt 32 when the load is large, the adjusting bolt 32 pressing the sliding block 33 to increase the pressure between the sliding block 33 and the insulated inner arm 2, avoiding the insulated inner arm 2 from shaking, and ensuring stability in large load operating conditions; when the load is small, the pressure is adjusted to reduce the wear of the insulated inner arm 2, avoiding excessive wear or insufficient stability caused by a single pressure fitting all scenarios, and improving the adaptability of the telescopic arm to different scenarios.

[0045] It should be noted that the specific way of fixing the arm barrel 1 and the base 31 is not limited here, which can be achieved by welding, bolt connection or setting a groove on the inner side of the arm barrel 1 to realize the clamping of the base 31, etc., which can ensure the connection strength of the base 31 and the arm barrel 1, meet the operation requirements of the insulated boom truck. The specific connection method of the slider 33 and the base 31 is not limited, which can be achieved by setting a limiting structure on the base 31 or using a latch connection, which can meet the position fixing of the slider 33 along the extension direction of the insulated inner arm 2, and the adjusting bolt 32 can also push the slider 33 to realize the pressure adjustment between the slider 33 and the insulated inner arm 2.

[0046] In an optional case, the slider 33 can be directly connected with the base 31, which can meet the position stability of the slider 33 and transmit the force received by the insulated inner arm 2 to the arm barrel 1 through the slider 33 and the base 31. In a preferred case, a buffer plate 34 is arranged between the slider 33 and the base 31, the buffer plate 34 is attached to the slider 33 and connected by a fixing bolt 35, the buffer plate 34 is connected with the base 31, and the adjusting bolt 32 abuts against the buffer plate 34.

[0047] Specifically, the buffer plate 34 is located between the slider 33 and the base 31, which is rigidly connected with the slider 33 through the fixing bolt 35 to ensure synchronous movement, and is connected with the base 31 to receive the pressure of the adjusting bolt 32, while absorbing part of the vibration and impact to reduce the hard contact between the slider 33 and the insulated inner arm 2. The buffer plate 34 is tightly attached to the slider 33 through the fixing bolt 35, and the two form a whole and are installed on the base 31; the end of the adjusting bolt 32 abuts against the buffer plate 34, and when the adjusting bolt 32 rotates, the axial force of the adjusting bolt 32 first acts on the buffer plate 34, and then the buffer plate 34 transmits the force to the slider 33 to finally change the contact pressure between the slider 33 and the insulated inner arm 2.

[0048] Through such a setting, the buffer plate 34 converts the single-point pressure of the adjusting bolt 32 into a surface contact pressure on the slider 33, avoiding the deformation of the slider 33 caused by local stress, and the fixing bolt 35 ensures that the slider 33 and the buffer plate 34 are subjected to synchronous force, reducing the local wear of the slider 33 caused by uneven stress, for example, when the adjusting bolt 32 is pressed, the buffer plate 34 can evenly distribute the force to the entire contact surface of the slider 33, avoiding the deformation or cracking of the slider 33 caused by excessive local pressure. The buffer plate 34 can also absorb the vibration of the insulated inner arm 2 during extension and retraction, such as slight shaking of the insulated inner arm 2 caused by wind during operation, reducing the rigid friction between the slider 33 and the insulated inner arm 2, reducing the wear speed of the two, especially protecting the insulation layer on the outer side of the insulated inner arm 2, avoiding the influence of wear on the insulation effect. The buffer plate 34 can reduce the direct impact of the slider 33 vibration on the adjusting bolt 32, avoiding the loosening of the adjusting bolt 32 caused by frequent vibration, and improving the stability of the adjusting structure.

[0049] It should be noted that the specific connection mode of the buffer plate 34 and the base 31 is not limited here, and in the case of ensuring the position stability of the buffer plate 34 and the sliding block 33, it can be directly abutted or limited by setting a latch or the like. Preferably, the base 31 is formed with a mounting groove 31a, and the buffer block is arranged in the mounting groove 31a, and the peripheral side of the buffer block abuts against the side wall of the mounting groove 31a.

[0050] Specifically, as shown in Figure 2 , the mounting groove 31a provides a limiting and mounting space for the buffer block, and the side wall of the mounting groove 31a specifically refers to the four peripheral side walls of the mounting groove 31a, that is, Figure 2 , the four peripheral side walls of the similar rectangular structure groove are parallel to the axial direction of the adjusting bolt 32, and the peripheral side of the buffer block specifically refers to the four periphery of the buffer block corresponding to the side wall of the mounting groove 31a as shown in Figure 2 . By abutting the side wall of the mounting groove 31a against the peripheral side of the buffer block, the displacement of the buffer block in the extension direction of the insulating inner arm 2 is limited, so that the buffer block can only move in the axial direction of the adjusting bolt 32, on the one hand, receiving the pressure of the adjusting bolt 32 and transmitting it to the sliding block 33, and on the other hand, transmitting the load to the base 31 through the abutment of the buffer block and the mounting groove 31a, avoiding the direct action of the lateral force on the adjusting bolt 32 or the sliding block 33.

[0051] Through such a setting, the side wall of the mounting groove 31a receives the lateral force, avoiding the displacement of the buffer block and the sliding block 33, ensuring that the sliding block 33 is always in abutment with the insulating inner arm 2, and improving the stability of the extension and retraction of the insulating inner arm 2. For example, during operation, the insulating inner arm 2 receives a load in the extension direction, which is transmitted to the buffer block through the static friction between the sliding block 33 and the buffer block, and then transmitted to the base 31 along the peripheral side of the buffer block, thereby limiting the displacement of the buffer block and the sliding block 33 in the extension direction, ensuring the load transmission effect and stability during the extension and retraction of the insulating inner arm 2. After the buffer block is limited in the mounting groove 31a, the stress on the buffer block is more uniform, and the local stress will not be too large due to the displacement or the extension and retraction of the insulating inner arm 2, reducing the force transmission failure caused by the deformation of the buffer block, such as cracking, indentation, etc., ensuring the stability of the extension and retraction of the insulating inner arm 2, and prolonging the service life of the buffer block. The structure of the mounting groove 31a and the buffer block is adapted, which can be used as the mounting reference of the buffer block, and the position of the buffer block does not need to be calibrated additionally during assembly, improving the assembly efficiency.

[0052] It should be noted that the specific size of the mounting groove 31a is not limited here, and it can meet the requirements of buffer block installation and load transmission. The mounting groove 31a can be used to accommodate the buffer block or part of the peripheral side of the buffer block, that is, the buffer block is fully or partially embedded in the mounting groove 31a; or the buffer block is fully embedded in the mounting groove 31a, and part of the peripheral side of the sliding block 33 is also embedded in the mounting groove 31a, at this time, the cross-sectional size of the mounting groove 31a, the buffer block and the sliding block 33 is the same perpendicular to the adjusting bolt 32.

[0053] Combining Figure 4 In the preferred case, the depth of the mounting groove 31a is greater than the thickness of the buffer block, the side of the sliding block 33 that is attached to the buffer block is located in the mounting groove 31a, and the circumferential side of the sliding block 33 abuts against the side wall of the mounting groove 31a. Specifically, the depth of the mounting groove 31a is greater than the thickness of the buffer block, and the buffer block is entirely embedded in the mounting groove 31a. At this time, part of the sliding block 33 can also be directly embedded in the mounting groove 31a. When the insulated inner arm 2 transmits the load to the arm cylinder 1 through the sliding assembly 3, the insulated inner arm 2 directly transmits the load to the sliding block 33 through static friction, and the sliding block 33 transmits the load along its circumferential side to the side wall of the mounting groove 31a, reducing the stress on the buffer block and the fixing bolt 35.

[0054] Through such a setting, the sliding block 33 can be partially embedded in the mounting groove 31a, realizing reliable connection of the sliding block 33 and the base 31, and converting the traditional single-point force mode of the bolt into a multi-surface force mode of the side wall of the mounting groove 31a. On the one hand, it can withstand greater load operation of the insulated aerial work platform truck, ensuring the load transmission effect and improving the overall structural stability and safety. On the other hand, through the embedded setting, the thickness of the sliding block 33 can be reduced while ensuring the load transmission effect. At this time, the insulated inner arm 2 can be closer to the base 31. By reducing the distance between the insulated inner arm 2 and the base 31, the moment during the extension and operation of the insulated inner arm 2 is reduced under the condition of transmitting the same load, further improving the load capacity and stability during operation of the insulated aerial work platform truck, reducing the deformation of the sliding block 33, the base 31 and the insulated inner arm 2, and prolonging the service life.

[0055] In the preferred case, the bottom of the mounting groove 31a forms a limiting hole 31b, and the end of the fixing bolt 35 is located in the limiting hole 31b. Specifically, after the fixing bolt 35 connects the sliding block 33 and the buffer block and fixes the buffer block and the sliding block 33 in the mounting groove 31a, the end of the fixing bolt 35 extends into the limiting hole 31b. It should be noted that the diameter of the limiting hole 31b is greater than the diameter of the fixing bolt 35, so that the fixing bolt 35 can move relative to the limiting hole 31b when the adjusting bolt 32 adjusts the pressure between the sliding block 33 and the insulated inner arm 2. During the use of the insulated aerial work platform truck, the mounting groove 31a on the base 31 may be deformed due to the load. For example, in the extension direction of the insulated inner arm 2, most of the load will be transmitted to the base 31 along the side wall of the mounting groove 31a close to the bottom side of the arm cylinder 1. At this time, the buffer block and the sliding block 33 will also be displaced due to the slight deformation of the mounting groove 31a. By extending the fixing bolt 35 into the limiting hole 31b at the bottom of the mounting groove 31a, the sliding block 33 and the buffer block can be prevented from moving with the deformation of the mounting groove 31a, and the overall shear strength of the sliding assembly 3 during the extension of the insulated inner arm 2 is increased.

[0056] It should be noted that the specific structure of the insulating inner arm 2 and the arm barrel 1 is not limited here, and the insulating inner arm 2 and the arm barrel 1 can be flexibly selected and matched according to the insulating bucket truck, and the specific number of the sliding assembly 3 is not limited, and can be adaptively arranged according to the structure of the insulating inner arm 2 and the arm barrel 1. Taking the case that the cross section of the insulating inner arm 2 and the arm barrel 1 is rectangular as an example, in the preferred case, four sliding assemblies 3 are arranged between the arm barrel 1 and the insulating inner arm 2, and the four sliding assemblies 3 are arranged on the four inner side walls at the end of the arm barrel 1 and are uniformly arranged along the circumferential side of the insulating inner arm 2, that is, one sliding assembly 3 is arranged around the same cross section of the insulating inner arm 2.

[0057] Specifically, when the cross section of the arm barrel 1 and the insulating inner arm 2 is rectangular, the four sliding assemblies 3 are uniformly distributed along the circumferential side of the insulating inner arm 2, and when the insulating inner arm 2 is stretched or bears a load, each sliding assembly 3 is in contact with the insulating inner arm 2 from the corresponding direction, and the load is evenly distributed to the four sliding assemblies 3, thereby ensuring the load transfer effect and the stability of the insulating inner arm 2; at the same time, the circumferentially uniformly distributed sliding assemblies 3 can limit the lateral deviation (that is, perpendicular to the stretching direction) of the insulating inner arm 2 from various directions, and when the insulating inner arm 2 deviates in a certain direction, the sliding assembly 3 on the corresponding side will provide a reverse supporting force, thereby ensuring that the insulating inner arm 2 always stretches in the axial direction.

[0058] Through such arrangement, the four sliding assemblies 3 share the radial force, thereby avoiding the overloading and wear of a single assembly, such as the conventional single-sided sliding block 33 or the symmetrical two sliding blocks 33, which can be quickly worn due to long-term bearing of the weight of the insulating inner arm 2, thereby prolonging the service life of all the sliding assemblies 3. The circumferentially uniform support can limit the deflection of the insulating inner arm 2, thereby ensuring that the insulating inner arm 2 is coaxial with the arm barrel 1 when the insulating inner arm 2 is stretched, and the insulating inner arm 2 will not shake due to the single-sided gap, thereby reducing the wear deviation between the insulating inner arm 2 and the sliding block 33, such as the local friction between the edge of the insulating inner arm 2 and the sliding block 33, and avoiding the jamming caused by the deflection, thereby improving the operation safety. The four uniformly distributed sliding assemblies 3 can jointly bear a larger load, thereby enabling the device to adapt to higher weight high-altitude operations.

[0059] In the preferred case, the device further comprises a dustproof plate 4, the dustproof plate 4 is connected with two adjacent sliding assemblies 3, and the dustproof plate 4 abuts against the circumferential side of the insulating inner arm 2. Specifically, the dustproof plate 4 is connected with two adjacent sliding assemblies 3, thereby forming a dustproof barrier around the circumferential side of the insulating inner arm 2, and the edge of the dustproof plate 4 abuts against the circumferential side of the insulating inner arm 2, thereby blocking the external dust and sundries, such as the dust and gravel on the construction site, from entering the sliding gap between the arm barrel 1 and the insulating inner arm 2, thereby avoiding that the impurities are jammed between the sliding block 33 and the insulating inner arm 2, thereby affecting the stretching action of the insulating inner arm 2 and the structural strength in operation; the adjacent sliding assemblies 3 serve as the mounting carrier of the dustproof plate 4, and at this time, the edge of the base 31 is flush with the end edge of the arm barrel 1. The dustproof plate 4 is connected through the base 31 to form a circumferentially continuous protection structure of the insulating inner arm 2, and the four dustproof plates 4 are respectively arranged at the adjacent positions of the four sliding assemblies 3, thereby covering the circumferential side of the insulating inner arm 2.

[0060] In the process of stretching and retracting the insulating inner arm 2, the dustproof plate 4 is connected with the adjacent sliding assembly 3 at both ends, and the inner side of the dustproof plate 4 (the side facing the insulating inner arm 2) is in abutment with the lateral side of the insulating inner arm 2. The dustproof plate 4 slides relative to the surface of the insulating inner arm 2, and the edge thereof can scrape off the dust and sundries attached to the surface of the insulating inner arm 2. Meanwhile, the dustproof plate 4 covers the outside of the contact area between the sliding assembly 3 and the insulating inner arm 2, thereby blocking the external sundries from entering the arm cylinder 1 through the gap and reducing the pollution of the sliding contact surface by the sundries.

[0061] Through such an arrangement, the dustproof plate 4 can scrape off the sundries on the surface of the insulating inner arm 2 and block the external sundries from entering, thereby avoiding the sundries from increasing the abrasion between the sliding block 33 and the insulating inner arm 2 and prolonging the service life of the sliding block 33 and the insulating inner arm 2. For example, when the dustproof plate 4 is used in a substation with a lot of dust, the dustproof plate 4 can effectively block the dust from entering the sliding gap, thereby avoiding the surface of the sliding block 33 from being scratched by the dust. Without sundries, the sliding friction between the sliding block 33 and the insulating inner arm 2 is more stable and will not be stuck or slip due to the sundries, thereby ensuring the accuracy of the stretching and retracting operation of the insulating inner arm 2. If the electrically conductive sundries such as metal dust are attached to the surface of the insulating inner arm 2, the insulation performance of the insulating inner arm 2 may be affected. The dustproof plate 4 can indirectly maintain the insulation reliability of the insulating inner arm 2 by removing the sundries.

[0062] It should be noted that the specific structure of the dustproof plate 4 is not limited here. The dustproof plate 4 can be a whole body that is sleeved on the outside of the insulating inner arm 2 and blocks the end of the arm cylinder 1 as a whole. Alternatively, the dustproof plate 4 can be arranged in a structure that is adapted to the shape of the corner of the insulating inner arm 2, as shown in FIGS. 11 and 12. Figure 5 Figure 6 As shown in FIGS. 11 and 12, the dustproof plate 4 is arranged at the gap position adjacent to the sliding assembly 3. In the process of stretching and retracting the insulating inner arm 2, the outer surface of the insulating inner arm 2 directly abuts against the sliding block 33. Under the condition that there is sufficient pressure between the sliding block 33 and the insulating inner arm 2, the sliding block 33 itself also has a dustproof effect and can prevent dust from entering the arm cylinder 1. The dustproof plate 4 cooperates with the sliding block 33 to achieve the dustproof effect of the whole circumference of the insulating inner arm 2. The dust can effectively enter the arm cylinder 1 from the gap between the adjacent two sliding blocks 33. At this time, the length of the dustproof plate 4 can be shortened, thereby improving the strength of the dustproof plate 4 and effectively preventing the dustproof plate 4 from being deformed or damaged in the process of stretching and retracting the insulating inner arm 2, which affects the dustproof effect.

[0063] ​It should be noted that the specific fixing mode of the dustproof plate 4 is not limited here, which can be directly bonded with the end of the arm barrel 1 or the sliding assembly 3, or connected by bolts, etc., which can meet the requirement that the dustproof plate 4 is always in the preset position during the extension and retraction of the insulating inner arm 2. In the preferred case, a first mounting hole 31c is formed on the base 31, and a second mounting hole 4a is formed on the dustproof plate 4, and the first mounting hole 31c and the second mounting hole 4a are connected by bolts. Specifically, the first mounting hole 31c of the base 31 cooperates with the second mounting hole 4a of the dustproof plate 4 to form a bolt connection positioning structure, which provides a precise mounting position for the connection of the dustproof plate 4 and the base 31, and ensures that the inner side of the dustproof plate 4 is accurately fitted with the insulating inner arm 2 after installation. The bolt connection mode is also convenient for disassembly and replacement of the dustproof plate 4, which is convenient for maintenance after the dustproof effect decreases.

[0064] Through such a setting, the rigid fixation of the bolt connection can resist external forces such as frictional resistance, wind force, etc. between the dustproof plate 4 and the insulating inner arm 2, and ensure that the dustproof plate 4 does not loosen for a long time, especially suitable for high-frequency extension and retraction operation scenarios. For example, after multiple extension and retraction operations of the insulating inner arm 2, the bolt connection can avoid position deviation of the dustproof plate 4 due to repeated friction. The cooperation of the first mounting hole 31c and the second mounting hole 4a ensures that the fitting gap between the dustproof plate 4 and the insulating inner arm 2 is uniform, and does not cause one side to be too tightly fitted and quickly worn, or the other side to have too large a gap and allow impurities to enter, thereby improving the dustproof and wear-resistant effects. The bolt connection is detachable, and when the dustproof plate 4 is worn, such as having too many edge scratches, the bolt can be directly unscrewed to replace a new dustproof plate 4, without the need to disassemble the sliding assembly 3 or the arm barrel 1, thereby reducing maintenance costs.

[0065] It should be noted that the first mounting hole 31c and the second mounting hole 4a are arranged according to the specific structure of the insulating inner arm 2 and the arm barrel 1, such as in Figure 4 and Figure 5 , the base 31 is arranged on the side close to the end of the arm barrel 1, and one first mounting hole 31c is arranged at each end, which is used for mounting the dustproof plate 4 at the two corners of the insulating inner arm 2, and two second mounting holes 4a are arranged on each dustproof plate 4, which are connected by bolts with the first mounting holes 31c on the two adjacent bases 31.

[0066] In the preferred case, the device further comprises a reinforcing plate 5, the reinforcing plate 5 is connected with the dustproof plate 4, and the reinforcing plate 5 does not contact the insulating inner arm 2. Specifically, as shown in Figure 7 and Figure 8As shown, the reinforcing plate 5 is connected with the dustproof plate 4, the reinforcing plate 5 is arranged outside the dustproof plate 4, and the reinforcing plate 5 and the surface of the insulating inner arm 2 are not in contact, a small deformation space is provided inside the dustproof plate 4 during the expansion and contraction of the insulating inner arm 2, the rigid connection between the dustproof plate 4 and the surface of the insulating inner arm 2 is avoided, the structural strength of the dustproof plate 4 is enhanced through the rigidity of the reinforcing plate 5 itself, especially the bending resistance of the dustproof plate 4 is improved, and the deformation of the dustproof plate 4 due to stress, such as friction resistance with the insulating inner arm 2 and wind force, is avoided.

[0067] Through such an arrangement, after the rigidity of the reinforcing plate 5 is enhanced, the dustproof plate 4 can still maintain the shape of being attached to the insulating inner arm 2 even if it is subjected to greater friction resistance or wind force, and the uniformity of the dustproof gap is ensured. The local stress concentration of the dustproof plate 4 due to bending, such as excessive friction of the edge with the insulating inner arm 2, is reduced, and at the same time, the reinforcing plate 5 shares part of the stress, avoiding fatigue damage of the dustproof plate 4 as a single component, improving the dustproof effect and the service life of the dustproof plate 4. The reinforcing plate 5 does not contact the insulating inner arm 2, which will not increase the expansion resistance of the insulating inner arm 2, avoid the increase of the operating force during operation, ensure the installation stability of the dustproof plate 4, and will not damage the insulating inner arm 2.

[0068] Here, the specific connection mode of the reinforcing plate 5 and the dustproof plate 4 is not limited, and can be adhesive or threaded, and in a preferred case, a mounting hole corresponding to the second mounting hole 4a is arranged on the reinforcing plate 5, and the reinforcing plate 5, the dustproof plate 4 and the sliding assembly 3 are connected through bolts.

[0069] In a preferred case, the dustproof plate 4 is made of a flexible material, such as rubber, flexible plastic, etc. After installation, the contact part of the dustproof plate 4 with the insulating inner arm 2 will slightly deform due to elasticity, tightly attach to the surface of the insulating inner arm 2, and fill the small gap; when the insulating inner arm 2 expands and contracts, the flexible material and the surface of the insulating inner arm 2 are in flexible friction, and the heat and wear caused by friction are smaller; when the insulating inner arm 2 appears slight bending due to load or has slight protrusions on the surface, the flexible dustproof plate 4 can locally bend due to deformation, still maintain the attachment, and continuously block impurities from entering.

[0070] It should be understood that the above specific embodiments of the present application are only used for illustrative or explanatory purposes of the principles of the present application, and do not constitute a limitation of the present application. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present application shall be included in the protection scope of the present application. In addition, the appended claims of the present application are intended to cover all variations and modifications falling within the scope and boundary of the appended claims, or the equivalent forms of such scope and boundary.

Claims

1. A sliding connection device for the telescopic boom of an insulated bucket truck, characterized in that, The device includes a boom (1), an insulated inner arm (2), and a sliding assembly (3), wherein the boom (1) and the insulated inner arm (2) are connected by the sliding assembly (3); The sliding assembly (3) includes a base (31), an adjusting bolt (32), and a slider (33). The base (31) is fixedly connected to the inner wall of the arm cylinder (1). The slider (33) is connected to the base (31) and slidably connected to the outer side of the insulated inner arm (2). The adjusting bolt (32) passes through the arm cylinder (1) and the base (31) and is used to adjust the sliding connection strength between the slider (33) and the insulated inner arm (2) on the outer side of the arm cylinder (1).

2. The apparatus according to claim 1, characterized in that, The sliding assembly (3) further includes a buffer plate (34) and a fixing bolt (35). The buffer plate (34) is attached to the slider (33) and connected by the fixing bolt (35). The buffer plate (34) is connected to the base (31). The adjusting bolt (32) abuts against the buffer plate (34).

3. The apparatus according to claim 2, characterized in that, The base (31) has a mounting groove (31a), and the buffer block is disposed in the mounting groove (31a), with the periphery of the buffer block abutting against the side wall of the mounting groove (31a).

4. The apparatus according to claim 3, characterized in that, The depth of the mounting groove (31a) is greater than the thickness of the buffer block. The side of the slider (33) that is in contact with the buffer block is located in the mounting groove (31a). The periphery of the slider (33) abuts against the side wall of the mounting groove (31a).

5. The apparatus according to claim 4, characterized in that, The bottom of the mounting groove (31a) is formed with a limiting hole (31b), and the end of the fixing bolt (35) is located in the limiting hole (31b).

6. The apparatus according to claim 1, characterized in that, A plurality of sliding components (3) are provided between the arm cylinder (1) and the insulating inner arm (2). The plurality of sliding components (3) are disposed on the inner side of the end of the arm cylinder (1) and are evenly arranged along the periphery of the insulating inner arm (2).

7. The apparatus according to claim 6, characterized in that, The device also includes a dustproof plate (4), which is connected to two adjacent sliding components (3) and abuts against the periphery of the insulating inner arm (2).

8. The apparatus according to claim 7, characterized in that, A first mounting hole (31c) is formed on the base (31), and a second mounting hole (4a) is formed on the dustproof plate (4). The first mounting hole (31c) and the second mounting hole (4a) are connected by bolts.

9. The apparatus according to claim 7, characterized in that, The device also includes a reinforcing plate (5), which is connected to the dustproof plate (4) and does not contact the insulating inner arm (2).

10. The apparatus according to claim 7, characterized in that, The dustproof panel (4) is made of flexible material.

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