Telescopic boom, boom device and working machine

Abstract

The utility model relates to the technical field of engineering machinery, and provides a telescopic arm, an arm support device and operation machinery, and the telescopic arm comprises a telescopic arm cylinder, a sixth arm cylinder and a driving mechanism, the telescopic arm barrel at least comprises a first arm barrel, a second arm barrel, a third arm barrel, a fourth arm barrel and a fifth arm barrel which are sequentially sleeved together from outside to inside as well as a first driving cylinder and a second driving cylinder which are two-stage cylinders, and the first arm barrel, the second arm barrel and the third arm barrel are connected through the first driving cylinder; the third arm barrel, the fourth arm barrel and the fifth arm barrel are connected through a second driving cylinder; the sixth arm cylinder is in sliding fit with the telescopic arm cylinder in the axis direction of the telescopic arm cylinder. And the driving mechanism drives the sixth arm cylinder to slide relative to the telescopic arm cylinder. By means of the arrangement, five-stage stretching and retracting of the telescopic arm barrel are achieved through the two-stage cylinder, use of rope rows is reduced, occupation of the rope rows on the transverse space of the telescopic arm barrel is reduced, reserved space is increased for the sixth arm barrel, the number of the arm barrels of the telescopic arm is increased, and development of an ultra-long arm is promoted.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a telescopic arm, an arm support device and an operating machine. Background Art

[0002] In various aerial operations and fire rescue operations, operating machinery with foldable and unfoldable boom devices are used. For example, in a fire truck, the boom device is one of the key components that determine the overall operating performance of the fire truck. In order to ensure the rescue height of the fire truck, it is necessary to ensure the unfolded length of its boom device. Therefore, the boom device of the fire truck is gradually developing in the direction of super-long arms.

[0003] As a type of boom device, the telescopic boom has its arm sections sleeved together. In some related technologies, a single-stage oil cylinder and a rope row are used to realize the extension and retraction of each arm section. The extension of the second-stage boom section relies on the driving action of the single-stage oil cylinder, and the third-stage and above boom sections all rely on the rope chain to provide traction tension. The closer the rope chain is to the first-stage boom section, the greater the tension it is subjected to, and it increases step by step in a doubling manner, and the higher the strength requirement of the chain is. The higher the strength of the chain, the larger its cross-sectional size, and the larger the space occupied in the lateral direction of the telescopic boom. When the number of boom sections of the telescopic boom is large, the overall cross-sectional size of the telescopic boom is larger.

[0004] The length and height of fire trucks under certain working conditions will limit the length and cross-sectional dimensions of a single-section telescopic boom, and thus the maximum load-bearing capacity of a single-section boom. Considering the load-bearing capacity and cross-sectional dimensions of the telescopic boom, the telescopic boom in related technologies generally does not exceed five levels, which limits the development of ultra-long telescopic booms. Utility Model Content

[0005] The utility model provides a telescopic arm, an arm support device and an operating machine, which are used to solve the above-mentioned defects.

[0006] The utility model provides a telescopic arm, comprising:

[0007] The telescopic arm cylinder at least comprises a first arm cylinder, a second arm cylinder, a third arm cylinder, a fourth arm cylinder and a fifth arm cylinder which are sleeved together in sequence from the outside to the inside, and a first driving cylinder and a second driving cylinder, wherein the first driving cylinder and the second driving cylinder are both two-stage cylinders, the first arm cylinder, the second arm cylinder and the third arm cylinder are connected by the first driving cylinder, and the third arm cylinder, the fourth arm cylinder and the fifth arm cylinder are connected by the second driving cylinder;

[0008] a sixth arm tube, slidingly matched with the telescopic arm tube along the axial direction of the telescopic arm tube;

[0009] The driving mechanism is arranged outside the sixth arm tube, and the driving mechanism is suitable for driving the sixth arm tube to slide relative to the telescopic arm tube.

[0010] According to a telescopic arm provided by the utility model, the sixth arm tube is located inside the fifth arm tube, and the driving mechanism includes:

[0011] a fifth rotating wheel, rotatably disposed on the fifth arm tube;

[0012] a fifth cable chain, wound around the fifth rotating wheel, one end of the fifth cable chain being connected to the fourth arm tube, and the other end of the fifth cable chain being connected to the sixth arm tube;

[0013] a sixth rotating wheel, rotatably disposed on the fifth arm tube;

[0014] A sixth cable chain is wound around the sixth rotating wheel, one end of the sixth cable chain is connected to the fourth arm tube, and the other end of the sixth cable chain is connected to the sixth arm tube.

[0015] According to a telescopic arm provided by the utility model, the fifth rotating wheel and the sixth rotating wheel both include sprockets, and the fifth cable chain and the sixth cable chain both include chains that can be meshed with the sprockets for transmission.

[0016] According to a telescopic arm provided by the utility model, the sixth arm tube is located outside the first arm tube, and the driving mechanism includes:

[0017] The third driving cylinder is arranged outside the sixth arm tube. The third driving cylinder is a single-stage cylinder. One of the piston rod and the cylinder tube of the third driving cylinder is connected to the sixth arm tube, and the other is connected to the first arm tube.

[0018] According to a telescopic arm provided by the utility model, the first driving cylinder and the second driving cylinder are double-stage single-acting cylinders, and the telescopic arm further includes:

[0019] A first traction system is arranged between the first arm tube, the second arm tube and the third arm tube, and the first traction system is suitable for making the third arm tube and the second arm tube extend and retract synchronously;

[0020] And / or, a second traction system is arranged between the third arm tube, the fourth arm tube and the fifth arm tube, and the second traction system is suitable for making the fourth arm tube and the fifth arm tube extend and retract synchronously.

[0021] According to a telescopic arm provided by the utility model, the first traction system includes:

[0022] A first rotating wheel is rotatably disposed on the second arm tube;

[0023] A first cable chain is wound around the first rotating wheel, one end of the first cable chain is connected to the first arm tube, and the other end of the first cable chain is connected to the third arm tube;

[0024] A second rotating wheel is rotatably disposed on the second arm tube;

[0025] The second cable chain is wound around the second rotating wheel, one end of the second cable chain is connected to the first arm tube, and the other end of the second cable chain is connected to the third arm tube.

[0026] According to a telescopic arm provided by the utility model, the second traction system includes:

[0027] A third rotating wheel is rotatably disposed on the fourth arm tube;

[0028] A third cable chain is wound around the third rotating wheel, one end of the third cable chain is connected to the third arm tube, and the other end of the third cable chain is connected to the fifth arm tube;

[0029] A fourth rotating wheel, rotatably disposed on the fourth arm tube;

[0030] A fourth cable chain is wound around the fourth rotating wheel, one end of the fourth cable chain is connected to the third arm tube, and the other end of the fourth cable chain is connected to the fifth arm tube.

[0031] According to a telescopic arm provided by the utility model, the first driving cylinder has three parts that can slide relatively along its own axial direction, one of the three parts provided with a medium inlet and outlet is fixedly connected to the head end of the first arm tube, and the other two are respectively fixedly connected to the head end of the second arm tube and the head end of the third arm tube.

[0032] The utility model also provides an arm support device, comprising the telescopic arm mentioned above.

[0033] The utility model also provides an operating machine, wherein the operating machine comprises a fire truck, and the operating machine comprises the telescopic arm mentioned above, or comprises the arm support device mentioned above.

[0034] The telescopic arm provided by the utility model comprises a telescopic arm tube, a sixth arm tube and a driving mechanism. The telescopic arm tube at least comprises a first arm tube, a second arm tube, a third arm tube, a fourth arm tube, a fifth arm tube, a first driving cylinder and a second driving cylinder. The first arm tube, the second arm tube, the third arm tube, the fourth arm tube and the fifth arm tube are sequentially sleeved together from the outside to the inside, and any two adjacent ones can slide relative to each other. The first driving cylinder and the second driving cylinder are both two-stage cylinders. The first arm tube, the second arm tube and the third arm tube are connected by the first driving cylinder. Through the action of the first driving cylinder, the second arm tube and the third arm tube can be driven to extend or retract. The third arm tube, the fourth arm tube and the fifth arm tube are connected by the second driving cylinder. Through the action of the second driving cylinder, the fourth arm tube and the fifth arm tube can be driven to extend or retract. The sixth arm tube can slide with the telescopic arm tube along the axial direction of the telescopic arm tube. The driving mechanism is arranged on the outside of the sixth arm tube. The driving mechanism can drive the sixth arm tube to slide relative to the telescopic arm tube, thereby realizing the telescoping of at least six-stage arm tubes. With this arrangement, the telescopic arm can be extended and retracted in at least five stages by utilizing the two-stage cylinder, which reduces the use of rope rows and the lateral space occupied by the telescopic arm. Space is reserved for the addition of the sixth arm, the number of arm tubes of the telescopic arm is increased, and the development of super-long arms is promoted.

[0035] Furthermore, in the arm support device provided by the present invention, since it is provided with the telescopic arm as described above, it also has the various advantages as described above.

[0036] Furthermore, in the working machine provided by the present invention, since it is provided with the telescopic arm or boom device as described above, it also has the various advantages as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 The utility model is a schematic diagram of the structural principle of a telescopic arm.

[0039] Figure 2 It is a schematic diagram of the structural principle of another telescopic arm provided by the utility model.

[0040] Figure 3 It is a structural schematic diagram of the first driving cylinder and the second driving cylinder provided by the utility model.

[0041] Figure 4 It is a cross-sectional view of the telescopic arm provided by the utility model.

[0042] Reference numerals:

[0043] 1. First arm cylinder; 2. Second arm cylinder; 3. Third arm cylinder; 4. Fourth arm cylinder; 5. Fifth arm cylinder; 6. Sixth arm cylinder; 7. First drive cylinder; 8. Second drive cylinder; 9. Fifth rotating wheel; 10. Fifth chain; 11. Sixth rotating wheel; 12. Sixth chain; 13. Third drive cylinder; 14. First rotating wheel; 15. First chain; 16. Second rotating wheel; 17. Second chain; 18. Third rotating wheel; 19. Third chain; 20. Fourth rotating wheel; 21. Fourth chain; 22. Medium inlet and outlet; 23. Cylinder rod; 24. Primary cylinder barrel; 25. Secondary cylinder barrel. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0045] Combine the following Figures 1 to 4 The invention describes a telescopic arm.

[0046] like Figures 1 to 4 As shown, the telescopic arm provided by the embodiment of the utility model includes a telescopic arm cylinder, a sixth arm cylinder 6 and a driving mechanism.

[0047] Specifically, the telescopic arm tube at least includes a first arm tube 1, a second arm tube 2, a third arm tube 3, a fourth arm tube 4, a fifth arm tube 5, a first driving cylinder 7 and a second driving cylinder 8. The axis of the first arm tube 1, the axis of the second arm tube 2, the axis of the third arm tube 3, the axis of the fourth arm tube 4 and the axis of the fifth arm tube 5 are parallel to each other. The first arm tube 1, the second arm tube 2, the third arm tube 3, the fourth arm tube 4 and the fifth arm tube 5 are sequentially arranged together from the outside to the inside, and any two adjacent ones can slide relative to each other.

[0048] The first drive cylinder 7 and the second drive cylinder 8 are both double-stage cylinders, each of which has three parts that can slide along its own axial direction.

[0049] The first arm tube 1, the second arm tube 2 and the third arm tube 3 are connected by the first driving cylinder 7. Specifically, the three parts of the first driving cylinder 7 are respectively fixedly connected to the first arm tube 1, the second arm tube 2 and the third arm tube 3. Through the action of the first driving cylinder 7, the second arm tube 2 and the third arm tube 3 can be driven to extend or retract.

[0050] The third arm tube 3, the fourth arm tube 4 and the fifth arm tube 5 are connected by the second driving cylinder 8. Specifically, the three parts of the second driving cylinder 8 are respectively fixedly connected to the third arm tube 3, the fourth arm tube 4 and the fifth arm tube 5. The movement of the second driving cylinder 8 can drive the fourth arm tube 4 and the fifth arm tube 5 to extend or retract.

[0051] The sixth arm tube 6 is connected to the telescopic arm tube, and the sixth arm tube 6 can slide with the telescopic arm tube along the axial direction of the telescopic arm tube. The driving mechanism is arranged outside the sixth arm tube 6, and the driving mechanism can drive the sixth arm tube 6 to slide relative to the telescopic arm tube, thereby realizing the telescoping of at least six stages of the arm tube.

[0052] With such an arrangement, the telescopic arm can be extended and retracted in at least five stages by using a two-stage cylinder, which reduces the use of rope rows and the occupation of the lateral space of the telescopic arm by the rope rows, reserves space for the addition of the sixth arm 6, increases the number of arm tubes of the telescopic arm, and promotes the development of super-long arms.

[0053] It should be noted that the first drive cylinder 7 and the second drive cylinder 8 are arranged inside the telescopic arm tube. When all the arms of the telescopic arm tube are retracted, the first drive cylinder 7 and the second drive cylinder 8 are both extended into the interior of the fifth arm tube 5 to ensure that all the arms of the telescopic arm tube are fully retracted. The fifth arm tube 5 is the one with the smallest cross-sectional size among all the arms of the telescopic arm tube. The arrangement of the drive cylinders inside it is relatively limited. Under the premise of ensuring that the fire truck is not over-high or over-wide, it is difficult to continue to increase the number of drive cylinders inside the telescopic arm tube.

[0054] In some embodiments of the utility model, the sixth arm tube 6 is located inside the fifth arm tube 5 , and the sixth arm tube 6 is slidably matched with the fifth arm tube 5 . The sixth arm tube 6 can be extended from the fifth arm tube 5 and retracted into the fifth arm tube 5 .

[0055] At this time, the driving mechanism includes a fifth rotating wheel 9 , a fifth cable chain 10 , a sixth rotating wheel 11 and a sixth cable chain 12 .

[0056] The fifth rotating wheel 9 is arranged at the tail end of the fifth arm tube 5 , and the fifth rotating wheel 9 is rotationally connected to the fifth arm tube 5 . The rotation axis of the fifth rotating wheel 9 relative to the fifth arm tube 5 is perpendicular to the axis of the fifth arm tube 5 .

[0057] It should be noted that the telescopic arm has a head end and a tail end, the head end of the telescopic arm is an end for connecting to a vehicle or a mounting seat, and the tail end of the telescopic arm is an end for connecting to a load. Accordingly, the head end of the first arm tube 1, the head end of the second arm tube 2, the head end of the third arm tube 3, the head end of the fourth arm tube 4, the head end of the fifth arm tube 5, and the head end of the sixth arm tube 6 are all ends close to the head end of the telescopic arm, and the tail end of the first arm tube 1, the tail end of the second arm tube 2, the tail end of the third arm tube 3, the tail end of the fourth arm tube 4, the tail end of the fifth arm tube 5, and the tail end of the sixth arm tube 6 are all ends away from the head end of the telescopic arm.

[0058] The fifth cable chain 10 is wound around the fifth rotating wheel 9, one end of the fifth cable chain 10 is connected to the fourth arm tube 4, and the other end of the fifth cable chain 10 is connected to the head end of the sixth arm tube 6. The fifth cable chain 10 passes over the top of the fifth rotating wheel 9, and when the fifth arm tube 5 extends from the fourth arm tube 4, the distance between the fifth rotating wheel 9 and the fourth arm tube 4 gradually increases, and the length of the portion of the fifth cable chain 10 located between the fifth rotating wheel 9 and the fourth arm tube 4 gradually increases. Under the pulling force of the fifth cable chain 10, the sixth arm tube 6 extends from the fifth arm tube 5, so that the distance between the fifth rotating wheel 9 and the head end of the sixth arm tube 6 gradually decreases.

[0059] The sixth rotating wheel 11 is disposed at the head end of the fifth arm tube 5 , and the sixth rotating wheel 11 is rotationally connected to the fifth arm tube 5 . The rotation axis of the sixth rotating wheel 11 relative to the fifth arm tube 5 is perpendicular to the axis of the fifth arm tube 5 .

[0060] The sixth cable chain 12 is wound around the sixth rotating wheel 11, one end of the sixth cable chain 12 is connected to the tail end of the fourth arm tube 4, and the other end of the sixth cable chain 12 is connected to the sixth arm tube 6. The sixth cable chain 12 is passed around from below the sixth rotating wheel 11, and when the fifth arm tube 5 is retracted relative to the fourth arm tube 4, the distance between the sixth rotating wheel 11 and the head end of the fourth arm tube 4 gradually increases, and the length of the portion of the sixth cable chain 12 located between the sixth rotating wheel 11 and the fourth arm tube 4 gradually increases. Under the pulling force of the sixth cable chain 12, the sixth arm tube 6 is retracted into the inside of the fifth arm tube 5, so that the distance between the sixth rotating wheel 11 and the sixth arm tube 6 is gradually reduced.

[0061] Such arrangement, combined with the fifth rotating wheel 9, the fifth cable chain 10, the sixth rotating wheel 11 and the sixth cable chain 12, realizes the synchronous extension and retraction of the sixth arm tube 6 and the fifth arm tube 5, avoids the increase in the number of driving cylinders used, and is beneficial to reducing the weight of the telescopic arm.

[0062] In other embodiments of the present invention, the sixth arm tube 6 is located outside the first arm tube 1 , and the sixth arm tube 6 is slidably matched with the first arm tube 1 , and the telescopic arm tube as a whole can be extended from the sixth arm tube 6 and retracted into the sixth arm tube 6 .

[0063] At this time, the driving mechanism includes a third driving cylinder 13, which is arranged outside the sixth arm tube 6. The third driving cylinder 13 is a single-stage cylinder, and one of the piston rod and the cylinder of the third driving cylinder 13 is connected to the sixth arm tube 6, and the other is connected to the first arm tube 1. Through the action of the third driving cylinder 13, the telescopic arm tube as a whole can be driven to extend from the sixth arm tube 6 and retract into the sixth arm tube 6.

[0064] In this arrangement, a single-stage cylinder is used to realize the extension and retraction of the telescopic arm tube relative to the sixth arm tube 6, and the third drive cylinder 13 is located outside the sixth arm tube 6, that is, the third drive cylinder 13 is located outside the telescopic arm tube and the sixth arm tube 6 as a whole, which will not affect the cross-sectional dimensions of each arm tube of the telescopic arm. The arrangement of the third drive cylinder 13 outside the sixth arm tube 6 is simple in structure, and the position of the third drive cylinder 13 can be set according to the space around the telescopic arm.

[0065] The third driving cylinder 13 is a single-stage double-acting oil cylinder. The movement of the piston rod of the third driving cylinder 13 extending from the cylinder barrel and the movement of the piston rod retracting into the cylinder barrel both rely on the action of hydraulic oil.

[0066] The first drive cylinder 7 and the second drive cylinder 8 are both double-stage single-acting oil cylinders, which have three parts that can slide relatively along their own axes, namely, the cylinder rod 23, the primary cylinder barrel 24 and the secondary cylinder barrel 25. The cylinder rod 23 is located in the primary cylinder barrel 24, and the primary cylinder barrel 24 is located in the secondary cylinder barrel 25. The action of the cylinder rod 23 extending from the primary cylinder barrel 24 and the action of the primary cylinder barrel 24 extending from the secondary cylinder barrel 25 are both based on the action of hydraulic oil. The action of the cylinder rod 23 retracting into the primary cylinder barrel 24 and the action of the primary cylinder barrel 24 retracting into the secondary cylinder barrel 25 can be achieved by the action of gravity.

[0067] A medium inlet and outlet 22 is provided on the cylinder rod 23 of the two-stage single-acting cylinder. When oil is supplied to the inside of the two-stage single-acting cylinder or when the oil in the two-stage single-acting cylinder is discharged outward, the secondary cylinder 25 first slides relative to the primary cylinder 24, and the primary cylinder 24 then slides relative to the cylinder rod 23.

[0068] The cylinder rod 23 of the first drive cylinder 7 is fixedly connected to the head end of the first arm tube 1, and the primary cylinder tube 24 and the secondary cylinder tube 25 of the first drive cylinder 7 are respectively fixedly connected to the head end of the second arm tube 2 and the head end of the third arm tube 3. The cylinder rod 23 of the first drive cylinder 7 is relatively fixed to the first arm tube 1, and the medium inlet and outlet 22 are also relatively fixed to the first arm tube 1, which is conducive to simplifying the layout of the hydraulic system. The hydraulic oil circuit connected to the first drive cylinder 7 does not need to pass through the drag chain system, which is conducive to reducing the size and weight of the drag chain system.

[0069] The cylinder rod 23 of the second driving cylinder 8 is fixedly connected to the head end of the third arm tube 3, and the primary cylinder tube 24 and the secondary cylinder tube 25 of the second driving cylinder 8 are fixedly connected to the head end of the fourth arm tube 4 and the head end of the fifth arm tube 5 respectively.

[0070] In order to ensure the synchronous extension of the second arm tube 2 and the third arm tube 3 and the synchronous extension of the fourth arm tube 4 and the fifth arm tube 5, the telescopic arm in the embodiment of the utility model further includes a first traction system and a second traction system.

[0071] The first traction system is arranged between the first arm tube 1 , the second arm tube 2 and the third arm tube 3 , and the first traction system is used to make the third arm tube 3 and the second arm tube 2 extend and retract synchronously.

[0072] The second traction system is arranged between the third arm tube 3 , the fourth arm tube 4 and the fifth arm tube 5 , and the second traction system is used to make the fourth arm tube 4 and the fifth arm tube 5 extend and retract synchronously.

[0073] In this embodiment, the first traction system includes a first rotating wheel 14 , a first cable chain 15 , a second rotating wheel 16 and a second cable chain 17 .

[0074] The first rotating wheel 14 is disposed at the head end of the second arm tube 2 , and the first rotating wheel 14 is rotatably connected to the second arm tube 2 . The rotation axis of the first rotating wheel 14 relative to the second arm tube 2 is perpendicular to the axis of the second arm tube 2 .

[0075] The first cable chain 15 is wound around the first rotating wheel 14, one end of the first cable chain 15 is connected to the tail end of the first arm tube 1, and the other end of the first cable chain 15 is connected to the third arm tube 3. The first cable chain 15 is wound around the bottom of the first rotating wheel 14, and when the third arm tube 3 is extended from the second arm tube 2 under the action of the first driving cylinder 7, the distance between the first rotating wheel 14 and the third arm tube 3 gradually increases, and the length of the portion of the first cable chain 15 located between the first rotating wheel 14 and the third arm tube 3 gradually increases. The force generated by the first cable chain 15 on the first rotating wheel 14 causes the first rotating wheel 14 to drive the second arm tube 2 to extend from the first arm tube 1, so that the distance between the first rotating wheel 14 and the tail end of the first arm tube 1 gradually decreases.

[0076] The second rotating wheel 16 is disposed at the rear end of the second arm tube 2 , and the second rotating wheel 16 is rotatably connected to the second arm tube 2 . The rotation axis of the second rotating wheel 16 relative to the second arm tube 2 is perpendicular to the axis of the second arm tube 2 .

[0077] The second chain 17 is wound around the second rotating wheel 16, one end of the second chain 17 is connected to the first arm tube 1, and the other end of the second chain 17 is connected to the head end of the third arm tube 3. The second chain 17 is passed over the second rotating wheel 16, and when the oil in the double-stage single-acting cylinder is discharged outward, the third arm tube 3 slides into the second arm tube 2 under the action of gravity. In the process of the third arm tube 3 being retracted to the second arm tube 2, the distance between the second rotating wheel 16 and the head end of the third arm tube 3 gradually increases, and the length of the part of the second chain 17 located between the second rotating wheel 16 and the third arm tube 3 gradually increases. The second chain 17 acts on the second rotating wheel 16, so that the second rotating wheel 16 drives the second arm tube 2 to slide into the first arm tube 1, so that the distance between the second rotating wheel 16 and the first arm tube 1 gradually decreases.

[0078] Such arrangement, combined with the first rotating wheel 14, the first cable chain 15, the second rotating wheel 16 and the second cable chain 17, realizes the synchronous extension and retraction of the second arm tube 2 and the third arm tube 3, which is beneficial to improving the extension and retraction efficiency of the telescopic arm.

[0079] Similarly, in this embodiment, the second traction system includes a third rotating wheel 18 , a third cable chain 19 , a fourth rotating wheel 20 and a fourth cable chain 21 .

[0080] The third rotating wheel 18 is disposed at the head end of the fourth arm tube 4 , and is rotationally connected to the fourth arm tube 4 . The rotation axis of the third rotating wheel 18 relative to the fourth arm tube 4 is perpendicular to the axis of the fourth arm tube 4 .

[0081] The third cable chain 19 is wound around the third rotating wheel 18. Specifically, the third cable chain 19 is wound around the bottom of the third rotating wheel 18. One end of the third cable chain 19 is connected to the tail end of the third arm tube 3, and the other end of the third cable chain 19 is connected to the fifth arm tube 5.

[0082] The fourth rotating wheel 20 is disposed at the rear end of the fourth arm tube 4 , and the fourth rotating wheel 20 is rotationally connected to the fourth arm tube 4 . The rotation axis of the fourth rotating wheel 20 relative to the fourth arm tube 4 is perpendicular to the axis of the fourth arm tube 4 .

[0083] The fourth cable chain 21 is wound around the fourth rotating wheel 20. Specifically, the fourth cable chain 21 is wound around the top of the fourth rotating wheel 20. One end of the fourth cable chain 21 is connected to the third arm tube 3, and the other end of the fourth cable chain 21 is connected to the head end of the fifth arm tube 5.

[0084] Such arrangement, combined with the third rotating wheel 18, the third cable chain 19, the fourth rotating wheel 20 and the fourth cable chain 21, realizes the synchronous extension and retraction of the fourth arm tube 4 and the fifth arm tube 5, which is beneficial to improve the telescopic efficiency of the telescopic arm.

[0085] It should be noted that the working principle of the second traction system is the same as that of the first traction system, which will not be repeated here.

[0086] In the embodiment of the utility model, the first rotating wheel 14, the second rotating wheel 16, the third rotating wheel 18, the fourth rotating wheel 20, the fifth rotating wheel 9 and the sixth rotating wheel 11 all include sprockets, and the first chain 15, the second chain 17, the third chain 19, the fourth chain 21, the fifth chain 10 and the sixth chain 12 all include chains that can be meshed and transmitted with the corresponding sprockets.

[0087] On the other hand, an embodiment of the utility model further provides a boom device, including the telescopic arm provided by any of the above embodiments. The above telescopic arm reduces the use of rope rows, realizes six-stage telescopic extension, and promotes the development of super-long arms. Therefore, the boom device in this embodiment has a longer unfolded length and a wider operating range. The derivation process of the beneficial effects of the boom device in the embodiment of the utility model is generally similar to the derivation process of the beneficial effects of the above telescopic arm, so it will not be repeated here.

[0088] On the other hand, the embodiment of the utility model further provides a working machine, including the telescopic arm or arm support device provided in any of the above embodiments. It has all the advantages of the above telescopic arm, which will not be repeated here. The derivation process of the beneficial effects of the working machine in the embodiment of the utility model is generally similar to the derivation process of the beneficial effects of the above telescopic arm, so it will not be repeated here.

[0089] In the embodiments of the present invention, the type of the working machine is not limited, for example, the working machine may be a fire truck, a crane, an aerial work vehicle, etc. In other words, as long as the working machine can use the telescopic arm in the embodiments of the present invention, it will be fine.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A telescopic arm, characterized in that: include: The telescopic arm cylinder at least comprises a first arm cylinder, a second arm cylinder, a third arm cylinder, a fourth arm cylinder and a fifth arm cylinder which are sleeved together in sequence from the outside to the inside, and a first driving cylinder and a second driving cylinder, wherein the first driving cylinder and the second driving cylinder are both two-stage cylinders, the first arm cylinder, the second arm cylinder and the third arm cylinder are connected by the first driving cylinder, and the third arm cylinder, the fourth arm cylinder and the fifth arm cylinder are connected by the second driving cylinder; a sixth arm tube, slidingly matched with the telescopic arm tube along the axial direction of the telescopic arm tube; The driving mechanism is arranged outside the sixth arm tube, and the driving mechanism is suitable for driving the sixth arm tube to slide relative to the telescopic arm tube.

2. The telescopic arm according to claim 1, characterized in that: The sixth arm tube is located inside the fifth arm tube, and the driving mechanism includes: a fifth rotating wheel, rotatably disposed on the fifth arm tube; a fifth cable chain, wound around the fifth rotating wheel, one end of the fifth cable chain being connected to the fourth arm tube, and the other end of the fifth cable chain being connected to the sixth arm tube; a sixth rotating wheel, rotatably disposed on the fifth arm tube; A sixth cable chain is wound around the sixth rotating wheel, one end of the sixth cable chain is connected to the fourth arm tube, and the other end of the sixth cable chain is connected to the sixth arm tube.

3. The telescopic arm according to claim 2, characterized in that: The fifth rotating wheel and the sixth rotating wheel both include sprockets, and the fifth cable chain and the sixth cable chain both include chains that can be meshed with the sprockets for transmission.

4. The telescopic arm according to claim 1, characterized in that: The sixth arm tube is located outside the first arm tube, and the driving mechanism includes: The third driving cylinder is arranged outside the sixth arm tube. The third driving cylinder is a single-stage cylinder. One of the piston rod and the cylinder tube of the third driving cylinder is connected to the sixth arm tube, and the other is connected to the first arm tube.

5. The telescopic arm according to claim 1, characterized in that: The first drive cylinder and the second drive cylinder are double-stage single-acting cylinders, and the telescopic arm further comprises: A first traction system is arranged between the first arm tube, the second arm tube and the third arm tube, and the first traction system is suitable for making the third arm tube and the second arm tube extend and retract synchronously; And / or, a second traction system is arranged between the third arm tube, the fourth arm tube and the fifth arm tube, and the second traction system is suitable for making the fourth arm tube and the fifth arm tube extend and retract synchronously.

6. The telescopic arm according to claim 5, characterized in that: The first traction system comprises: A first rotating wheel is rotatably disposed on the second arm tube; A first cable chain is wound around the first rotating wheel, one end of the first cable chain is connected to the first arm tube, and the other end of the first cable chain is connected to the third arm tube; A second rotating wheel is rotatably disposed on the second arm tube; The second cable chain is wound around the second rotating wheel, one end of the second cable chain is connected to the first arm tube, and the other end of the second cable chain is connected to the third arm tube.

7. The telescopic arm according to claim 5, characterized in that: The second traction system comprises: A third rotating wheel is rotatably disposed on the fourth arm tube; A third cable chain is wound around the third rotating wheel, one end of the third cable chain is connected to the third arm tube, and the other end of the third cable chain is connected to the fifth arm tube; A fourth rotating wheel, rotatably disposed on the fourth arm tube; A fourth cable chain is wound around the fourth rotating wheel, one end of the fourth cable chain is connected to the third arm tube, and the other end of the fourth cable chain is connected to the fifth arm tube.

8. The telescopic arm according to claim 1, characterized in that: The first drive cylinder has three parts that can slide relatively along its own axial direction. One of the three parts with a medium inlet and outlet is fixedly connected to the head end of the first arm tube, and the other two are fixedly connected to the head end of the second arm tube and the head end of the third arm tube respectively.

9. A boom device, characterized in that: Comprising the telescopic arm according to any one of claims 1 to 8.

10. A working machine, comprising a fire truck, characterized in that: The working machine comprises the telescopic arm as described in any one of claims 1 to 8, or comprises the arm device as described in claim 9.

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