CN116553443B - High-altitude operation device - Google Patents

Abstract

The application discloses an aerial working device. The overhead working equipment comprises a machine body, a telescopic arm, a telescopic oil cylinder, a guide component and a power pipeline. The telescopic arm comprises a basic arm, a middle arm and an extension arm. The cylinder rod of the telescopic cylinder is connected with the arm tail of the basic arm. The cylinder barrel of the telescopic cylinder is connected with the middle arm. The guide assembly comprises a first guide wheel assembly, a second guide wheel assembly and a guide rail. The first end of the guide rail is connected to the arm tail of the base arm and extends toward the arm head of the base arm. The first guide wheel assembly is arranged at the second end of the guide rail. The second guide wheel assembly is arranged at the tail of the middle arm. The power pipeline extends from the arm tail of the basic arm towards the arm head, extends to the arm tail of the middle arm after turning back in the middle of the basic arm, and extends from the arm tail of the middle arm, and extends to the arm head of the extension arm after bypassing the first guide wheel assembly and the second guide wheel assembly. The space arrangement inside the telescopic boom is optimized, so that the arrangement form is also applicable to four-section booms, and the working height is improved.

Description

High-altitude operation device

Technical Field

The application relates to the technical field of engineering machinery, in particular to an aerial working device.

Background

The movable lifting working platform is widely applied to industries such as building construction, steel structures, venues, ships, leases and the like at present, but different working conditions are different in working environments, and specific requirements on vehicles are different. For example, high-altitude operation equipment used in the ship industry is used for sanding, spraying water and spraying paint for a long time, and in order to reduce environmental pollution, closed space operation is generally required. Especially, when sanding operation, the visibility of the operation environment is very low, and the boom structure of the vehicle is easy to collide with obstacles in the operation environment due to the fact that the visibility is only 1-2 meters. The cable and the hydraulic pipeline conveying system are arranged on the outer side of the arm support and are easy to collide and deform, normal use of a vehicle is affected, dust is easy to deposit, pipeline abrasion is accelerated, and service life is affected. Therefore, the cable and hydraulic pipeline conveying system needs to be arranged in the arm according to the operation working conditions with special working condition requirements in the ship industry and the like. The arrangement form of the built-in cable and hydraulic pipeline conveying system mainly conveys the cable and the hydraulic pipeline through a drag chain, but the arrangement form has higher difficulty for the more complex arm support structure form and the smaller arm support section arrangement.

It should be noted that the statements in this background section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

Disclosure of Invention

The application provides an aerial working device, which is used for improving the working height of the aerial working device.

The application provides an overhead working device which comprises a machine body, a telescopic arm, a telescopic oil cylinder, a guide assembly and a power pipeline. The tail of the telescopic arm is connected with the machine body. The telescopic arm comprises a basic arm, and a middle arm and an extension arm which are sequentially arranged in the basic arm. The arm head of the extension arm is used for carrying the operation mechanism. The telescopic cylinder is positioned inside the telescopic arm. The cylinder rod of the telescopic cylinder is connected with the arm tail of the basic arm. The cylinder barrel of the telescopic cylinder is connected with the middle arm. At least a portion of the cylinder extends into the extension arm when the extension arm is not extended. When the telescopic oil cylinder stretches out, the middle arm stretches out relative to the basic arm under the drive of the cylinder barrel. The middle arm and the extension arm are pulled by a rope so that the extension arm synchronously stretches relative to the middle arm when the middle arm stretches relative to the basic arm; the guide assembly comprises a first guide wheel assembly, a second guide wheel assembly and a guide rail. The first end of the guide rail is connected with the arm tail of the basic arm. The guide rail extends toward the arm head of the base arm in the extending direction of the telescopic arm. The first guide wheel assembly is disposed at the second end of the guide rail and rides on the surface of the cylinder. The second guide wheel assembly is arranged at the tail of the middle arm. The power pipeline is connected with the operation mechanism to provide power for the operation mechanism. The power pipeline extends from the tail of the basic arm towards the arm head along the outer surface of the basic arm, reversely extends to the inner side of the tail of the middle arm after turning back in the middle of the basic arm, extends from the tail of the middle arm along the guide rail, and extends to the arm head of the extending arm after bypassing the first guide wheel assembly and the second guide wheel assembly so as to be connected with the working mechanism.

In some embodiments, the aerial device further comprises a drag chain. The first end of the drag chain is connected to the tail of the intermediate arm. The second end of the drag chain is connected to the middle of the base arm. The power line enters the second end of the drag chain after turning back in the middle of the base arm and extends out from the first end of the drag chain.

In some embodiments, the aerial device further comprises a housing. The housing is disposed on an outer surface of the base arm. The drag chain is disposed within the housing. The portion of the power line located on the outer surface of the base arm is sealed by a housing.

In some embodiments, the distance between the first and second guide wheel assemblies is greater than the maximum extension stroke of the telescopic ram.

In some embodiments, the aerial device further comprises at least one length of extension arm. At least one expansion arm is disposed between the intermediate arm and the extension arm. At least one expansion arm is pulled by a rope between the middle arm and the at least one expansion arm and between the outer expansion arm and the at least one expansion arm, so that when the middle arm stretches out relative to the basic arm, the at least one expansion arm stretches out under the driving of the middle arm, and the outer expansion arm stretches out under the driving of the at least one expansion arm.

In some embodiments, the connection location of the first end of the rail to the tail of the base arm is adjustable.

In some embodiments, the aerial device further comprises a connection device. The connecting device is arranged on the cylinder rod. The first end of the guide rail is connected with the cylinder rod through a connecting device. The tensioning degree of the power pipeline is adjusted by changing the connection position between the first end of the guide rail and the cylinder rod through disassembling the connecting device.

In some embodiments, the guide assembly further comprises a first support wheel. The first supporting wheel is arranged on the guide rail. When the telescopic oil cylinder stretches, the cylinder barrel is in sliding contact with the first supporting wheel.

In some embodiments, the aerial device further comprises a slider. The sliding piece is connected with the outer surface of the cylinder barrel. The sliding piece is configured to be in sliding contact with the inner wall of the arm section where the cylinder barrel is located during the telescopic arm telescopic process.

In some embodiments, the slider includes a second support wheel and a swing link. The first end of the swing rod is rotationally connected with the cylinder barrel. The second end of the swing rod is connected with a second supporting wheel. In the telescopic arm telescopic process, when the cylinder barrel enters the inside of different arm sections, the swing rod rotates to change the distance between the second supporting wheel and the cylinder barrel, so that the second supporting wheel is in sliding contact with the inner wall of different arm sections.

Based on the technical scheme provided by the application, the aerial working device comprises a machine body, a telescopic arm, a telescopic oil cylinder, a guide assembly and a power pipeline. The tail of the telescopic arm is connected with the machine body. The telescopic arm comprises a basic arm, and a middle arm and an extension arm which are sequentially arranged in the basic arm. The arm head of the extension arm is used for carrying the operation mechanism. The telescopic cylinder is positioned inside the telescopic arm. The cylinder rod of the telescopic cylinder is connected with the arm tail of the basic arm. The cylinder barrel of the telescopic cylinder is connected with the middle arm. At least a portion of the cylinder extends into the extension arm when the extension arm is not extended. When the telescopic oil cylinder stretches out, the middle arm stretches out relative to the basic arm under the drive of the cylinder barrel. The intermediate arm and the extension arm are pulled by a rope so that the extension arm synchronously extends and contracts relative to the intermediate arm when the intermediate arm extends and contracts relative to the basic arm. The guide assembly comprises a first guide wheel assembly, a second guide wheel assembly and a guide rail. The first end of the guide rail is connected with the arm tail of the basic arm. The guide rail extends toward the arm head of the base arm in the extending direction of the telescopic arm. The first guide wheel assembly is arranged at the second end of the guide rail. The second guide wheel assembly is arranged at the tail of the middle arm. The power pipeline is connected with the operation mechanism to provide power for the operation mechanism. The power pipeline extends from the tail of the basic arm towards the head of the basic arm along the outer surface of the basic arm, reversely extends to the tail of the middle arm after turning back in the middle of the basic arm, extends from the tail of the middle arm along the guide rail, and extends to the head of the extending arm after bypassing the first guide wheel assembly and the second guide wheel assembly so as to be connected with the working mechanism. The guide assembly is arranged inside the telescopic boom by means of the telescopic cylinder, so that synchronous telescopic operation of the power pipeline and the telescopic boom is realized, space arrangement inside the telescopic boom is optimized, the cross-sectional size of the boom sections is reduced, the arrangement form is also suitable for four-section booms, and the operation height of the overhead operation device is further improved.

Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the application, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application.

Fig. 1 is an overall schematic view of a telescopic arm according to an embodiment of the present application.

Fig. 2 is a schematic layout of the power lines inside the telescopic boom.

Fig. 3 is a schematic diagram of the cooperation of the telescopic cylinder and the guide rail in a top view.

Fig. 4 is a partial enlarged view of the connection device of fig. 3.

Fig. 5 is a schematic view of the mating of the rail and first guide wheel assembly.

Fig. 6 is a front view of the bracket of fig. 2.

Fig. 7 is a side view of the bracket of fig. 2.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and apparatus should be considered part of the specification. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways and the spatially relative descriptions used herein are construed accordingly.

The cable and hydraulic pipeline conveying system of the current movable lifting working platform are mainly arranged in three modes of external arrangement, internal arrangement and mixed arrangement. The external assembly and maintenance are convenient, but the pipeline is easy to collide with the outside to deform in the construction process, and the pipeline is easy to be worn by accumulated dust in a working environment with larger dust, so that the fault rate is high. The built-in type is mainly characterized in that a cable and a hydraulic pipeline are conveyed through a drag chain, but the arrangement form has higher difficulty for the more complex arm support structure form and the smaller arm support section arrangement. The hybrid type aerial working device mainly aims at aerial working equipment with higher working height, but the hybrid type aerial working device also has the problem of exposed pipelines.

In the prior art, the built-in cable and hydraulic pipeline conveying system is generally applicable to three sections of telescopic arms, the arrangement form is not applicable to four sections of telescopic arms, the layout is required to be redesigned, the operation height of the existing high-altitude operation equipment is limited, and the problem that four sections of telescopic arms are required to stretch synchronously in the number of high-altitude operation equipment cannot be solved. In the telescopic process, part of the cable and the hydraulic pipeline are still exposed on the arm support, and the complete embedment of the pipeline is not realized.

In order to solve the above problems, referring to fig. 1, the present application provides an aerial working device, which includes a body, a telescopic arm 1, a telescopic cylinder 2, a guide assembly 3, and a power pipeline 4. The arm tail of the telescopic arm 1 is connected with the machine body. The telescopic arm 1 includes a base arm 11 and an intermediate arm 12 and an extension arm 13 which are sequentially provided in the base arm 11. The arm head of the extension arm 13 is used for mounting a working mechanism. The telescopic cylinder 2 is positioned inside the telescopic arm 1. The cylinder rod 21 of the telescopic cylinder 2 is connected to the arm tail of the base arm 11. The cylinder tube 22 of the telescopic cylinder 2 is connected to the intermediate arm 12. At least part of the cylinder 22 extends into the extension arm 13 when the extension arm 1 is not extended. When the telescopic cylinder 2 is extended, the middle arm 12 is extended relative to the base arm 11 under the drive of the cylinder 22. The intermediate arm 12 and the extension arm 13 are pulled by a rope so that the extension arm 13 is simultaneously extended and contracted with respect to the intermediate arm 12 when the intermediate arm 12 is extended and contracted with respect to the base arm 11. The guide assembly 3 includes a first guide wheel assembly 31, a second guide wheel assembly 32, and a guide rail 33. The first end of the guide rail 33 is connected to the arm tail of the base arm 11. The guide rail 33 extends toward the arm head of the base arm 11 in the extending direction of the telescopic arm 1. The first guide wheel assembly 31 is disposed at a second end of the guide rail 33. The second guide wheel assembly 32 is disposed at the tail of the intermediate arm 12. The power line 4 is connected to the work mechanism to power the work mechanism. The power line 4 extends from the tail of the base arm 11 toward the head along the outer surface of the base arm 11, reversely extends to the inside of the tail of the intermediate arm 12 after turning back in the middle of the base arm 11, and extends from the tail of the intermediate arm 12 along the guide rail 33 and around the first and second guide wheel assemblies 31 and 32 to the head of the extension arm 13 to connect with the working mechanism. The guide assembly 3 is arranged inside the telescopic boom 1 by means of the telescopic cylinder 2, so that synchronous telescopic operation of the power pipeline 4 and the telescopic boom 1 is realized, space arrangement inside the telescopic boom 1 is optimized, the cross-sectional size of the boom sections is reduced, the arrangement form is applicable to four-section booms, and the operation height of the overhead operation device is improved.

Since a portion of the power line 4 is bent and placed on the outer surface of the base arm 11, in order to avoid loosening of the power line 4 during extension and retraction of the telescopic arm 1, referring to fig. 1 and 2, in some embodiments, the aerial working device further comprises a drag chain 5. The first end of the drag chain 5 is connected to the tail of the intermediate arm 12. The second end of the drag chain 5 is connected to the middle of the base arm 11. The power line 4 enters the second end of the drag chain 5 after turning back in the middle of the base arm 11 and protrudes from the first end of the drag chain 5. The drag chain 5 plays a traction, restraint and protection role on the power pipeline 4 positioned on the outer surface of the basic arm 11.

The second guide wheel assembly 32 is arranged on the surface of the cylinder 22, and the second guide wheel assembly 32, the cylinder 22 and the middle arm 12 share the same connecting point, so that the power pipeline 4 directly extends into the inner cavity of the extension arm 13 until the arm head of the extension arm 13 after bypassing the second guide wheel assembly 32, and the complete built-in of the power pipeline 4 is realized in the whole telescopic process of the telescopic arm 1.

The power pipeline 4 can be a hydraulic pipeline, a cable or an integration of the hydraulic pipeline and the cable.

Referring to fig. 5, in some embodiments, the first guide wheel assembly 31 includes a guide wheel body 311, a bearing 312, a spacer 313, and a lock nut 314. The guide wheel body 311 is rotatably arranged relative to the guide rail 33 through a bearing 312, a limiting frame 313 is arranged on the side face of the guide rail 33 and laterally limits the guide wheel body 311, and a locking nut 314 fixedly arranges the limiting frame 313 on the guide rail 33 so as to ensure that the guide wheel body 311 does not shake accidentally. Referring to fig. 3 and 5, in some embodiments, the first and second guide wheel assemblies 31 and 32 are each provided in pairs and are distributed on both sides of the guide rail 33 and the intermediate arm 12, respectively.

Referring to fig. 1, in some embodiments, the aerial working device further comprises a housing 6. The housing 6 is provided on the outer surface of the base arm 11. The drag chain 5 is disposed within the housing 6. The portion of the power line 4 located on the outer surface of the base arm 11 is sealed by the housing 6. The housing 6 realizes the complete internal arrangement of the power pipeline 4, and further reduces the risk of collision of the power pipeline 4 with the outside due to accidents.

In some embodiments, the distance between the first guide wheel assembly 31 and the second guide wheel assembly 32 is greater than the maximum extension stroke of the telescopic ram 2. Specifically, when the telescopic cylinder 2 is extended, the middle arm 12 is extended relative to the base arm 11 under the driving of the cylinder 22, and the second guide wheel assembly 32 moves synchronously with the middle arm 12, and since the first guide wheel assembly 31 is disposed on the guide rail 33 and the guide rail is fixed relative to the base arm, the distance between the first guide wheel assembly 31 and the second guide wheel assembly 32 is continuously reduced. It is therefore necessary to set the length of the guide rail 33 according to the maximum stroke of the telescopic cylinder 2 so that the second guide wheel assembly 32 does not yet travel to the position where the first guide wheel assembly 31 is located when the telescopic cylinder 2 reaches the maximum extension amount.

Referring to fig. 1, in some embodiments, the aerial device further comprises at least one length of extension arm 14. At least one expansion arm 14 is arranged between the intermediate arm 12 and the extension arm 13. At least one expansion arm 14 and the middle arm 12 and at least one expansion arm 13 and at least one expansion arm 14 are pulled by ropes so that when the middle arm 12 stretches out relative to the basic arm 11, at least one expansion arm 14 stretches out under the drive of the middle arm 12, and the expansion arm 13 stretches out under the drive of at least one expansion arm 14. When the telescopic arm 1 is not extended, at least part of the cylinder 22 extends from the lumen of the intermediate arm 12 through the lumen of at least one section of the extension arm 14 and into the lumen of the extension arm 13.

In this embodiment, the pulley block formed by the first and second guide wheel assemblies 31 and 32 enables the built-in power line 4 to be extended simultaneously with the extension of the extension arm, and the extension of the power line 4 matches the extension of the extension arm 13. Specifically, the first guide wheel assembly 31 is a fixed pulley, which is held stationary when the telescopic arm 1 is telescopic, and the second guide wheel assembly 32 is a movable pulley, which moves with the intermediate arm 12 when the telescopic arm 1 is telescopic. When the second guide wheel assembly 32 extends along with the middle arm 12, the second guide wheel assembly 32 moves by one telescopic oil cylinder stroke, and the power pipeline 4 moves by two telescopic oil cylinder strokes, so that the distance of the power pipeline 4 moving relative to the middle arm 12 is twice of the distance of the telescopic oil cylinder 2, and the distance of the second guide wheel assembly 32 extending relative to the middle arm 12 is equal to the distance of the second guide wheel assembly 13 extending relative to the middle arm 12, and synchronous telescopic operation of the power pipeline 4 and the telescopic arm 1 can be realized all the time.

In the scheme of four sections of flexible arms in the prior art, the pipeline is fixed by arranging the drag chain inside the arm section, so that the flexible oil cylinder is arranged externally in order to prevent the section of the arm section from being designed larger, the risk of damage to the oil cylinder is caused, and the drag chain and the pipeline can be leaked when the flexible arm stretches out and draws back, so that the risk of damage is certain. The scheme does not need to set a drag chain in the arm section to fix the power pipeline 4, so that the power pipeline 4 and the telescopic cylinder 2 can be completely built-in on the premise of not increasing the section size of the arm section, and the scheme is simple and reliable.

In some embodiments, the connection position of the first end of the rail 33 to the tail of the base arm 11 is adjustable. Specifically, when the telescopic arm 1 is not telescopic, the guide rail 33 is moved back and forth relative to the base arm 11, and the tensioning degree of the power line 4 can be adjusted by adjusting the distance between the first guide wheel assembly 31 and the second guide wheel assembly 32.

Referring to fig. 3 and 4, in some embodiments the aerial device further comprises a connection device 7. The connecting means 7 are arranged on the cylinder rod 21. The first end of the rail 33 is connected to the cylinder rod 21 by means of the connecting means 7. The degree of tension of the power line 4 is adjusted by changing the connection position between the first end of the guide rail 33 and the cylinder rod 21 by removing the connection means 7. Specifically, the connecting device 7 includes a limiting plate 71 and a nut 72, the limiting plate 71 is fixedly connected with the cylinder rod 21, the first end of the guide rail 33 has a screw 33a, and the limiting plate 71 and the screw 33a are fastened by the nut 72. When the tensioning degree of the power pipeline 4 needs to be adjusted, the nuts 72 are unscrewed, so that the guide rail 33 can move relative to the limiting plate 71, and the distance between the first guide wheel assembly 31 and the second guide wheel assembly 32 is changed, so that the tensioning degree is adjusted.

In some embodiments, the connection means 7 comprise a positioning rod which is detachably connected to the cylinder rod 21, which positioning rod extends in a direction parallel to the direction of extension of the guide rail 33, in which positioning rod a plurality of spaced apart positioning holes are provided, on a first end of the guide rail 33a positioning protrusion is provided, which positioning protrusion is inserted into the positioning hole for a fixed connection of the guide rail 33 to the cylinder rod 21. The relative position between the guide rail 33 and the cylinder rod 21 is adjusted by matching the positioning projections with different positioning holes, so that the tension of the power line 4 is adjusted.

Referring to fig. 2, in some embodiments, the guide assembly 3 further comprises a first support wheel 34. The first supporting wheels 34 are provided on the guide rail 33. When the telescopic cylinder 2 is telescopic, the cylinder tube 22 is in sliding contact with the first support wheel 34. Specifically, the first support wheel 34 is disposed at a first end of the guide rail 33, and the cylinder 22 moves relative to the guide rail 33 when the telescopic cylinder 2 is telescopic, during which the first support wheel 34 rolls to reduce friction, and the guide rail 33 has a gap with a surface of the cylinder 22 under the support of the first support wheel 34 to reduce contact with the surface of the cylinder 22 when the power line 4 extends from the first guide wheel assembly 31 to the second guide wheel assembly 32.

Referring to fig. 3, in some embodiments, the aerial working device further comprises a slider 8. The slider 8 is connected to the outer surface of the cylinder 22, and the slider 8 is configured to be in sliding contact with the inner wall of the arm section where the cylinder 22 is located during extension and retraction of the extension and retraction arm 1. Specifically, the sliding piece 8 can support the telescopic cylinder 2, and can reduce friction between the cylinder 22 and the inner wall of the arm section, so that stability and reliability of the telescopic arm 1 in a telescopic process can be improved.

Still referring to fig. 3, in some embodiments, the slider 8 includes a second support wheel 81 and a swing link 82. The first end of the swing link 82 is rotatably connected to the cylinder 22. The second end of the swing link 82 is connected to the second supporting wheel 81. During the extension and retraction of the telescopic arm 1, when the cylinder 22 enters the inside of the different arm sections, the swing rod 82 rotates to change the distance between the second support wheel 81 and the cylinder 22, so that the second support wheel 81 is in sliding contact with the inner wall of the different arm sections.

Specifically, the slider 8 further includes an elastic member 83, and the elastic member 83 is connected between the surface of the cylinder 22 and the swing link 82 to apply elastic force to the swing link 82.

Taking the telescopic arm 1 with the extension arm 14 as an example, because the extension amount of the extension arm 13 relative to the basic arm 11 is larger than the extension amount of the cylinder barrel 22 relative to the basic arm 11, when the extension stroke of the telescopic cylinder 2 is larger, the cylinder barrel 22 can fall off from the inner cavity of the extension arm 13 and enter the inner cavity of the extension arm 14, and because the section size of the extension arm 14 is larger than that of the extension arm 13, the swing rod 82 rotates under the action of the elastic piece 83 at the moment so as to increase the distance between the second supporting wheel 81 and the surface of the cylinder barrel 22, and further the second supporting wheel 81 is in sliding contact with the inner wall of the extension arm 14, thereby guaranteeing the stability of the telescopic arm 1 in the extension process. Wherein, when the cylinder tube 22 is positioned in the inner cavity of the extension arm 13, the swing rod 82 is configured to extend towards the cylinder rod 21, and the elastic member 83 is configured to be pulled to apply a force for rotating the swing rod 82 in a direction away from the cylinder rod 21, thereby ensuring that the second supporting wheel 81 is always in contact with the inner wall of the extension arm 13. When the cylinder 22 enters the inner cavity of the expansion arm 14, the elastic piece 83 pulls the swing rod 82 to enable the swing rod 82 to rotate, so that the distance between the second supporting wheel 81 and the surface of the cylinder 22 is increased (at the moment, the elastic piece 83 is still in a tensile state, but the tensile degree is reduced), and further contact between the second supporting wheel 81 and the inner wall of the expansion arm 14 can be guaranteed.

Similarly, when the telescopic cylinder 2 is retracted, the cylinder tube 22 enters the inner cavity of the extension arm 13 from the inner cavity of the extension arm 14, at this time, the extension arm 13 presses the second supporting wheel 81, so that the swing rod 82 is forced to rotate toward the cylinder rod 21 to reduce the distance between the second supporting wheel 81 and the surface of the cylinder tube 22, and the elastic member 83 is further stretched.

In some embodiments, the spring 83 is a spring.

In some embodiments, the slides 8 are provided in two groups and symmetrically on both sides of the cylinder 22 to further improve stability.

Referring to fig. 1-3, in some embodiments, the aerial working device further comprises a reinforcement for imposing a constraint on the power line 4 such that the power line 4 does not loosen when the telescopic boom 1 is telescopic. Specifically, the reinforcement includes an anti-drop device 91, a bracket 92, and a fixing plate 93.

The drop prevention device 91 is provided at a winding point of the power line 4 at the first and second guide wheel assemblies 31 and 32 to prevent the power line 4 from dropping from the vicinity of the winding point. The drop-out prevention device 91 may be a U-shaped cover plate.

The bracket 92 is disposed at the arm tail of the intermediate arm 12 and fixedly connected to the cylinder 22, and the power line 4 is fixed by the bracket 92 at the arm tail of the intermediate arm 12. Referring to fig. 6 and 7, the bracket 92 has an arc portion, and the arc of the arc portion is adapted to the second guide wheel assembly 32 so that the bracket 92 covers the second guide wheel assembly 32 while fixing the power line 4, thereby protecting the second guide wheel assembly 32.

Referring to fig. 1 and 2, a fixing plate 93 is provided to keep the power line 4 stable at the arm head of the extension arm 13.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same; while the application has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present application or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the application, it is intended to cover the scope of the application as claimed.

Claims (8)

1. An aerial working device, comprising:

a body;

the telescopic arm (1), the arm tail of the telescopic arm (1) is connected with the machine body, the telescopic arm (1) comprises a basic arm (11), and an intermediate arm (12) and an extension arm (13) which are sequentially arranged in the basic arm (11), and the arm head of the extension arm (13) is used for carrying a working mechanism;

the telescopic cylinder (2) is positioned inside the telescopic arm (1), a cylinder rod (21) of the telescopic cylinder (2) is connected with the arm tail of the basic arm (11), a cylinder barrel (22) of the telescopic cylinder (2) is connected with the middle arm (12), when the telescopic arm (1) is not extended, at least part of the cylinder barrel (22) extends into the extension arm (13), when the telescopic cylinder (2) is extended, the middle arm (12) extends relative to the basic arm (11) under the driving of the cylinder barrel (22), and the middle arm (12) and the extension arm (13) are pulled by ropes so that when the middle arm (12) extends relative to the basic arm (11), the extension arm (13) extends synchronously relative to the middle arm (12);

the guide assembly (3) comprises a first guide wheel assembly (31), a second guide wheel assembly (32) and a guide rail (33), wherein the first end of the guide rail (33) is connected with the arm tail of the basic arm (11), the guide rail (33) extends towards the arm head of the basic arm (11) along the extending direction of the telescopic arm (1), the first guide wheel assembly (31) is arranged at the second end of the guide rail (33), and the second guide wheel assembly (32) is arranged at the arm tail of the middle arm (12);

a power pipeline (4) connected with the working mechanism to provide power for the working mechanism, wherein the power pipeline (4) extends from the tail of the basic arm (11) towards the arm head along the outer surface of the basic arm (11), reversely extends to the inner side of the tail of the middle arm (12) after turning back at the middle part of the basic arm (11), extends from the tail of the middle arm (12) along the guide rail (33) and winds the first guide wheel assembly (31) and the second guide wheel assembly (32) and then extends to the arm head of the extension arm (13) to be connected with the working mechanism; and

the sliding part (8), the sliding part (8) includes second supporting wheel (81) and pendulum rod (82), the first end of pendulum rod (82) with cylinder (22) rotate and are connected, the second end of pendulum rod (82) with second supporting wheel (81) are connected in telescopic in-process of telescopic arm (1), when cylinder (22) get into the inside of different arm festival, pendulum rod (82) rotate in order to change second supporting wheel (81) with distance between cylinder (22), so that second supporting wheel (81) and the inner wall sliding contact of different arm festival.

2. The aerial working device according to claim 1, further comprising a drag chain (5), a first end of the drag chain (5) being connected to an arm tail of the intermediate arm (12), a second end of the drag chain (5) being connected to a middle portion of the base arm (11), the power line (4) entering the second end of the drag chain (5) and extending from the first end of the drag chain (5) after turning back the middle portion of the base arm (11).

3. The aerial working device according to claim 2, further comprising a housing (6), the housing (6) being provided at an outer surface of the base arm (11), the drag chain (5) being provided within the housing (6), a portion of the power line (4) located at the outer surface of the base arm (11) being sealed by the housing (6).

4. Aerial working device according to claim 1, characterised in that the distance between the first and second guide wheel assemblies (31, 32) is greater than the maximum extension stroke of the telescopic ram (2).

5. The aerial working device according to claim 1, further comprising at least one expansion arm (14), wherein the at least one expansion arm (14) is disposed between the intermediate arm (12) and the extension arm (13), wherein the at least one expansion arm (14) and the intermediate arm (12) and the extension arm (13) and the at least one expansion arm (14) are pulled by ropes so that when the intermediate arm (12) is extended relative to the base arm (11), the at least one expansion arm (14) is extended under the drive of the intermediate arm (12), and the extension arm (13) is extended under the drive of the at least one expansion arm (14).

6. Aerial working device according to claim 1, characterised in that the connection position of the first end of the guide rail (33) to the arm tail of the basic arm (11) is adjustable.

7. The aerial working device according to claim 6, further comprising a connecting device (7), wherein the connecting device (7) is provided on the cylinder rod (21), the first end of the guide rail (33) is connected with the cylinder rod (21) through the connecting device (7), and the tensioning degree of the power line (4) is adjusted by changing the connection position between the first end of the guide rail (33) and the cylinder rod (21) by detaching the connecting device (7).

8. The aerial working device according to claim 1, wherein the guiding assembly (3) further comprises a first supporting wheel (34), the first supporting wheel (34) being arranged on the guide rail (33), the cylinder (22) being in sliding contact with the first supporting wheel (34) when the telescopic cylinder (2) is telescopic.