CN111517236B

CN111517236B - Telescopic mechanism, arm support and aerial working equipment

Info

Publication number: CN111517236B
Application number: CN202010362191.1A
Authority: CN
Inventors: 卿丽纯; 郭方云; 徐亮; 肖久焜; 方怡红
Original assignee: Hunan Shuangda Electromechanical Co ltd
Current assignee: Hunan Shuangda Electromechanical Co ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2022-06-28
Anticipated expiration: 2040-04-30
Also published as: CN111517236A

Abstract

The application provides a telescopic machanism, cantilever crane and high altitude construction equipment, the cantilever crane includes basic arm and the telescopic boom that cup joints, and telescopic machanism includes telescoping cylinder, tow chain group and guide. The telescopic rod of the telescopic cylinder is connected with the basic arm, and the cylinder barrel of the telescopic cylinder is connected with the telescopic arm. The tow chain group includes the layer board and connects the tow chain in layer board one end, and the other end and the basic arm of layer board are connected, and the other end and the cylinder of tow chain are connected. The guide piece is obliquely arranged at one end, close to the piston rod, of the cylinder barrel relative to the telescopic direction of the telescopic cylinder, and the height of one end, close to the piston rod, of the guide piece is lower than that of the other end of the guide piece. The application provides a telescopic machanism of cantilever crane through adopting the guide, provides certain support for the tow chain to the phenomenon that the tow chain caused the jamming to the cylinder has been prevented effectively when the cylinder retracts.

Description

Telescopic mechanism, arm support and aerial working equipment

Technical Field

The application relates to the technical field of aerial work equipment, in particular to a telescopic mechanism, an arm support and aerial work equipment.

Background

During the operation of high-altitude operation equipment, such as fire trucks and high-altitude operation vehicles, the operation position and the operation height of the equipment are usually changed by rotating and stretching the arm support. During the extension and retraction of the telescopic arm, the internal pipelines and lines need to extend along with the extension of the telescopic arm and retract along with the retraction of the telescopic arm. The pipeline and lines are typically laid within the drag chain and move with the movement of the drag chain.

In the prior art, after the telescopic arm extends out, the telescopic arm is easy to block in the retraction process, and a great deal of inconvenience is brought to normal construction operation.

Disclosure of Invention

In view of this, embodiments of the present disclosure are intended to provide a telescopic mechanism, an arm support and an aerial work device, so as to solve the problem of jamming when the telescopic arm retracts.

In order to achieve the above object, a first aspect of the embodiments of the present application provides a telescopic mechanism of a boom, where the boom includes a base arm and a telescopic arm that are sleeved, and the telescopic mechanism includes:

the piston rod of the telescopic cylinder is connected with the basic arm, and the cylinder barrel of the telescopic cylinder is connected with the telescopic arm;

the drag chain group comprises a supporting plate and a drag chain connected to one end of the supporting plate, the other end of the supporting plate is connected with the basic arm, and the other end of the drag chain is connected with the cylinder barrel; and

and the guide piece is obliquely arranged at one end, close to the piston rod, of the cylinder barrel relative to the telescopic direction of the telescopic cylinder, and the height of one end, close to the piston rod, of the guide piece is lower than that of the other end of the guide piece.

Further, telescopic machanism still includes the backup pad, the backup pad is installed on the cylinder, the tow chain is located on the backup pad.

Furthermore, the telescopic mechanism also comprises a hoop, and the supporting plate is arranged on the cylinder barrel through the hoop; and/or the presence of a gas in the atmosphere,

one end of the guide piece is connected with the supporting plate, and the other end of the guide piece is connected with the cylinder barrel.

Furthermore, telescopic machanism still include with the link that telescopic boom is connected, the link with the cylinder is kept away from the one end of piston rod is connected.

Further, the link includes support body and adjustment pad, the support body with the cylinder is connected, the adjustment pad sets up the support body with between the flexible arm.

Furthermore, telescopic machanism still includes the leading wheel, the leading wheel is installed on the cylinder for the motion of tow chain provides direction and spacing.

Further, telescopic machanism still includes the mounting panel, the tow chain is kept away from the one end of layer board is installed on the mounting panel, the mounting panel with telescopic boom is connected.

Further, the supporting plate comprises a groove plate and a connecting plate, one end of the groove plate is connected with the basic arm through the connecting plate, and the other end of the groove plate is connected with the drag chain.

Further, the supporting plate and the drag chain are both located above the telescopic cylinder, and at least part of the drag chain is arranged on one side of the supporting plate in parallel.

The telescopic machanism of cantilever crane that this application embodiment provided sets up the guide through the fixed part at the cylinder to at the in-process that telescopic boom withdraws back, provide certain direction for the tow chain, thereby prevented effectively that telescopic boom from taking place the jamming at the in-process that withdraws back.

A second aspect of the embodiments of the present application provides an arm support of an aerial work device, including a basic arm, a telescopic arm, and the telescopic mechanism of any of the above embodiments, where the telescopic arm is telescopically connected in the basic arm through the telescopic mechanism.

The boom of the aerial working device provided by the embodiment of the application has the same technical effect due to the adoption of the telescopic mechanism in any one of the embodiments, and the details are not repeated herein.

A third aspect of the embodiments of the present application provides an aerial working device, which includes the boom described in the previous embodiment.

The aerial working equipment provided by the embodiment of the application has the same technical effect due to the adoption of the arm support in the previous embodiment, and the details are not repeated.

Drawings

Fig. 1 is a schematic structural diagram of a telescopic mechanism according to an embodiment of the present application; and

fig. 2 is a partially enlarged view of a portion a in fig. 1.

Fig. 3 is a sectional view of the boom provided in an embodiment of the present application in a certain direction when the telescopic boom is in a retracted state;

FIG. 4 is an enlarged view of a portion of FIG. 3 at B;

fig. 5 is a sectional view of the boom provided in an embodiment of the present application in a certain direction when the telescopic boom is in an extended state;

description of reference numerals:

1. a base arm; 11. a head end; 12. a tail end; 2. a telescopic arm; 3. a telescopic cylinder; 31. a piston rod; 32. a cylinder barrel; 4. a drag chain group; 41. a drag chain; 42. a support plate; 421. a groove plate; 422. a connecting plate; 43. mounting a plate; 5. a guide member; 6. a guide wheel; 7. a support plate; 8. clamping a hoop; 9. a connecting frame; 91. a frame body; 92. and adjusting the cushion.

Detailed Description

It should be noted that, in the present application, technical features in examples and embodiments may be combined with each other without conflict, and the detailed description in the specific embodiment should be understood as an explanation of the gist of the present application and should not be construed as an improper limitation to the present application.

The directional terms used in the description of the present application are used for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.

Before describing the embodiments of the present application as part of the inventive concept of the present application, it is necessary to set forth technical problems related to the present application and specific reasons for causing the technical problems.

In high-altitude operation equipment such as a high-jet fire engine, a boom is one of indispensable parts. The arm support mainly comprises a basic arm 1 and a telescopic arm 2, and the overall length of the arm support is changed by controlling the extension and retraction movement of the telescopic arm 2 relative to the basic arm 1, so that the working height of the high-altitude operation equipment is changed to adapt to specific working requirements. During extension or retraction of the telescopic arm 2, the line bundle arranged within the drag chain 41 moves with the movement of the telescopic mechanism. However, in practical applications, in the process of controlling the retraction of the telescopic boom 2, the retraction movement is stopped when the telescopic boom 2 is not completely retracted, and the normal use of the aerial work equipment is seriously affected due to the problem.

Therefore, the technical personnel carry out comprehensive analysis and research on the structures of all parts of the arm support and a control system. As a result, it is found that, since the drag chain 41 is placed on the cylinder 32 during the movement, during the retraction, a section of the drag chain 41 between the end of the drag chain 41 connected to the pallet 42 and the end of the cylinder 32 is not supported by the cylinder 32 and is in a suspended state, and therefore, a certain amount of sagging of the section of the drag chain 41 occurs, especially, the sagging amount is the largest in the middle of the section of the drag chain 41. Therefore, in the process that the cylinder 32 drives the drag chain 41 to retract, the drooping drag chain 41 causes certain obstruction to the end surface of the cylinder 32, and further causes the clamping stagnation of the telescopic arm 2 in the retracting process.

In view of the above, referring to fig. 1 to 5, a first aspect of the embodiments of the present application provides a telescopic mechanism of a boom, where the boom includes a base arm 1 and a telescopic arm 2 that are sleeved together. The telescoping mechanism comprises a telescoping cylinder 3, a drag chain group 4 and a guide piece 5. The piston rod 31 of the telescopic cylinder 3 is connected to the base arm 1, and the cylinder tube 32 of the telescopic arm 3 is connected to the telescopic arm 2. The drag chain group 4 comprises a support plate 42 and a drag chain 41 connected to one end of the support plate 42, the other end of the support plate 42 is connected with the basic arm 1, and the other end of the drag chain 41 is connected with the cylinder 32. The guide 5 is obliquely installed on the cylinder tube 32 at one end close to the piston rod 31 with respect to the extension and contraction direction of the telescopic cylinder 3, and the height of the guide 5 at one end close to the piston rod 31 is lower than that at the other end.

In an embodiment, please refer to fig. 1 to 5, which take an application of the telescopic mechanism provided in the present application in a boom as an example. When the telescopic boom 2 is in the retracted state, referring to fig. 3, the telescopic boom 2 is overlapped with the base boom 1. In the state that the telescopic arm 2 is extended, please refer to fig. 5, at this time, the extended distance of the telescopic arm 2 is longest.

In the process that the cylinder barrel 32 of the telescopic cylinder 3 drives the telescopic arm 2 and one end of the drag chain 41 to move from the head end 11 to the tail end 12 of the basic arm 1, the telescopic arm 2 gradually extends out of the basic arm 1. The end of the drag chain 41 connected to the cylinder 32 is gradually moved toward the end of the drag chain 41 connected to the pallet 42, supported by the cylinder 32, until the telescopic arm 2 is fully extended, see fig. 3, when the length of the drag chain 41 connected to the end connected to the pallet 42 reaches a maximum value and the length of the drag chain 41 connected to the cylinder 32 reaches a minimum value.

During the retraction of the telescopic boom 2, the cylinder 32 drives one end of the drag chain 41 to move from the tail end 12 to the head end 11 of the basic boom 1. At this time, the drag chain 41 connected to the drag chain 42 in front of the cylinder 32 is not supported by the cylinder 32 in the moving direction of the cylinder 32, and is in a suspended state, and the drag chain 41 in the suspended state may droop to some extent under the influence of its own weight. During the retraction of the telescopic arm 2, without the guide 5, the drag chain 41 in a suspended state may cause a certain obstruction to the end of the cylinder 32, especially at the joint of the drag chain 41 and the support plate 42, thereby affecting the normal return of the cylinder 32.

After the guide 5 is provided, referring to fig. 1, the inclined guide 5 provides a certain guiding support for the suspended drag chain 41, which slides along the surface of the guide 5 to the upper surface of the cylinder 32, so as not to hinder the normal operation of the cylinder 32. The guide 5 can effectively prevent the telescopic arm 2 from being stuck when retracted.

It will be appreciated that the guide 5 may be of a variety of configurations, including a flat plate, a slotted plate, or a curved surface having a certain curvature. Only a certain guiding and supporting function can be provided for the drag chain 41 in a suspended state when the drag chain retracts. Which can be connected to the cylinder barrel 32 by means of a screw connection, welding or riveting.

According to the servo device of the telescopic arm, the guide piece 5 is obliquely arranged at one end, close to the piston rod 31, of the cylinder barrel 32, so that in the retraction process of the telescopic arm 2, the guide piece 5 plays a certain guiding and supporting role on the drag chain 41 in the suspension state, the drag chain 41 in the suspension state gradually slides towards the upper surface of the cylinder barrel 32, and the clamping phenomenon of the telescopic arm 2 in the retraction process can be effectively prevented.

In an embodiment, referring to fig. 1 to 3 and fig. 5, the telescopic mechanism of the boom further includes a supporting plate 7, the supporting plate 322 is installed on the cylinder 32, and the drag chain 41 is located on the supporting plate 7. Specifically, the support plate 7 is used for supporting the drag chain 41, and during the sliding process of the cylinder 32, the drag chain 41 slides on the cylinder 32. By adopting the supporting plate 7, the supporting plate 7 can directly provide a supporting function for the drag chain 41, so that the drag chain 41 can run more smoothly.

In a preferred embodiment, referring to fig. 1 and 3, the supporting plate 7 can be a thin plate structure, which increases the supporting area and reduces the supporting volume, thereby reducing the volume and weight of the cylinder 32.

Specifically, the support plate 7 may be connected to the cylinder tube 32 by welding, screwing, or the like. In a preferred embodiment, referring to fig. 1 and 2, the telescopic mechanism of the boom provided by the present application further includes a clamp 8, and the clamp 8 mounts the support plate 7 on the cylinder 32. Through clamp 8 joint on the cylinder, then fix on clamp 8 through threaded connection backup pad 7, can guarantee the fastness that the two connects, also can set up a plurality of clamps 8 in suitable position as required.

In one embodiment, referring to fig. 1 and 2, one end of the guide 5 is fixedly connected to the supporting plate 7, and the other end of the guide 5 is connected to the cylinder 32, so that the guide 5 is disposed obliquely with respect to the moving direction of the cylinder 32. In the case of a support plate 7 on the cylinder 32, an inclined support is provided for the guide 5 by means of the height difference between the support plate 7 and the cylinder 32, which is a simpler construction. Preferably, the guide 5 is smoothly connected with the support plate 7 to prevent the drag chain 41 from being stuck at the connection between the two.

In an embodiment, referring to fig. 1 to 3, the telescopic mechanism of the arm support further includes a connecting frame 9 connected to the telescopic arm 2, and the connecting frame 9 is connected to one end of the piston rod 31 of the cylinder 32. The connecting frame 9 may be used to ensure that the axis of the cylinder 32 is parallel to the axis of the piston rod 31. It can be understood that, as the sliding displacement of the cylinder 32 relative to the piston rod 31 becomes larger, the length of the suspended section at the front end of the cylinder 32 also increases gradually, and the suspended section tends to incline downward under the action of gravity. The connecting frame 9 is arranged at one end, far away from the piston rod 31, of the cylinder barrel 32, certain support is provided for the suspended section of the cylinder barrel 32, the sliding direction of the cylinder barrel 32 can be guaranteed to be parallel to the axis of the piston rod 31 all the time, and therefore clamping stagnation of the cylinder barrel 32 due to inclination in the sliding process is effectively prevented.

Further, in an embodiment, referring to fig. 4, in the telescopic mechanism of the boom support provided in the present application, the connecting frame 9 includes a frame body 91 and an adjusting pad 92, the frame body 91 is connected to the cylinder 32, and the adjusting pad 92 is disposed between the frame body 91 and the telescopic boom 2. The position of the cylinder 32 far away from the center of one end of the piston rod 31 can be adjusted by using the adjusting pad 92, so that the axis of the cylinder 32 is always coincident with the axis of the piston rod 31, and the clamping of the telescopic arm 2 caused by inclination in the process of extending or retracting is further prevented.

In an embodiment, referring to fig. 2, 3 and 5, the telescopic mechanism of the boom provided by the present application further includes a guide wheel 6, and the guide wheel 6 is mounted on the cylinder 32 for guiding and limiting the movement of the drag chain 41. It can be understood that the drag chain 41 is easily deformed due to a certain deflection of the drag chain 41 itself during the movement with the cylinder 32, and the distance between the drag chain 41 at the end connected with the pallet 42 and the drag chain 41 at the end connected with the cylinder 32 is short in order to save space, so that the drag chain 41 can be effectively prevented from being deformed and blocked by each other by the guide wheels 6. And the guide wheel 6 can roll along the drag chain 41, and has a certain guiding function on the normal operation of the cylinder barrel 32.

In an embodiment, referring to fig. 2, the telescopic mechanism of the arm support further includes a mounting plate 43, one end of the drag chain 41 away from the supporting plate 43 is mounted on the mounting plate 43, and the mounting plate 43 is connected to the telescopic arm 2. One end of the drag chain 41 can be better fixed with the telescopic arm 2 by the mounting plate 43.

In an embodiment, referring to fig. 2, in the telescopic mechanism of the arm support provided in the present application, the supporting plate 42 includes a groove plate 421 and a connecting plate 422, one end of the groove plate 421 is connected to the base arm 1 through the connecting plate 422, and the other end of the groove plate 421 is connected to the drag chain 41. It will be appreciated that the connecting position of the drag chain 41 and the pallet 42 is not necessarily set at the end of the base arm 1, and the connecting position of the drag chain 41 and the pallet is specifically set according to the length of the drag chain 41 and the maximum extension length of the telescopic arm 2. For example, referring to fig. 3 and 5, the drag chain 41 is connected to the support plate 42 at the middle portion of the base arm 1, and at this time, by providing the slot plate 421 having a certain length, the length of the drag chain 41 can be effectively reduced, and the connection between the slot plate of the support plate 41 and the base arm 1 is facilitated.

Further, in an embodiment, referring to fig. 1, 3 and 5, in the telescopic mechanism of the boom provided by the present application, the supporting plate 42 and the drag chain 41 are both located above the telescopic cylinder 3, and at least a portion of the drag chain 41 is juxtaposed on one side of the supporting plate 42. The arrangement can save space and can not generate interference in the movement process.

A second aspect of the embodiments of the present application provides an arm support of an aerial working device, including a basic arm 1, a telescopic arm 2, and the telescopic mechanism described in any of the above embodiments, where the telescopic arm 2 is telescopically connected in the basic arm 1 through the telescopic mechanism. Specifically, the aerial working equipment can comprise a multi-section arm support, and the arm support provided by the application can be applied to any arm support of the aerial working equipment.

The arm support of the high-altitude operation equipment provided by the embodiment of the application has the same technical effect due to the adoption of the telescopic mechanism provided by the embodiment of the application, and the details are not repeated.

A third aspect of the embodiments of the present application provides an aerial working device, which includes the boom described in the previous embodiment. The telescopic movement of the arm support is controlled, and the rotation of the arm support is combined, so that the tail end position of the arm support can be controlled, and the operation position of the flexible aerial operation equipment can be controlled. Specifically, the aerial work equipment may be a fire truck or an aerial work truck or the like.

The aerial working equipment provided by the embodiment of the application has the same technical effect due to the adoption of the arm support provided by the embodiment of the application, and the details are not repeated.

The various embodiments/implementations provided herein may be combined with each other without contradiction.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The telescopic mechanism of the arm support comprises a basic arm and a telescopic arm which are sleeved, and is characterized in that the telescopic mechanism comprises:

the guide piece is obliquely arranged at one end, close to the piston rod, of the cylinder barrel relative to the telescopic direction of the telescopic cylinder, and the height of one end, close to the piston rod, of the guide piece is lower than that of the other end of the guide piece;

the guide is used for providing guide support for the drag chain which is suspended downwards so that the drag chain slides to the upper surface of the cylinder barrel along the surface of the guide.

2. The telescoping mechanism of claim 1, further comprising a support plate mounted on the cylinder, the tow chain being located on the support plate.

3. The telescoping mechanism of claim 2, further comprising a clip that mounts the support plate to the cylinder; and/or the presence of a gas in the gas,

4. The telescoping mechanism of claim 1, further comprising a link connected to the telescoping arm, the link being connected to an end of the cylinder remote from the piston rod.

5. The telescoping mechanism of claim 4, wherein the link comprises a frame body and an adjustment pad, the frame body being connected to the cylinder barrel, the adjustment pad being disposed between the frame body and the telescoping arm.

6. The telescoping mechanism of any one of claims 1-5, further comprising a guide wheel mounted on the cylinder for guiding and limiting movement of the tow chain.

7. The telescoping mechanism of any one of claims 1 to 5, further comprising a mounting plate on which an end of the tow chain remote from the pallet is mounted, the mounting plate being connected to the telescoping arm.

8. The telescoping mechanism of any of claims 1-5, wherein the support plate comprises a slotted plate and a connecting plate, one end of the slotted plate is connected to the base arm through the connecting plate, and the other end of the slotted plate is connected to the tow chain.

9. The telescopic mechanism according to any one of claims 1 to 5, wherein the support plate and the drag chain are both located above the telescopic cylinder, and at least part of the drag chain is juxtaposed on one side of the support plate.

10. An arm support of high-altitude operation equipment is characterized by comprising a basic arm, a telescopic arm and a telescopic mechanism as claimed in any one of claims 1 to 9, wherein the telescopic arm is telescopically connected in the basic arm through the telescopic mechanism.

11. An aerial work device comprising the boom of claim 10.