Novel double-cylinder six-section-arm telescopic mechanism and crane

Abstract

The invention discloses a novel double-cylinder six-section-arm telescopic mechanism and a crane, the novel double-cylinder six-section-arm telescopic mechanism comprises a section arm suite, a first telescopic oil cylinder, a second telescopic oil cylinder and a rope row assembly, and the section arm suite comprises at least six section arms which are sequentially sleeved from outside to inside; the first telescopic oil cylinder and the second telescopic oil cylinder are connected between the two knuckle arms on the outermost layer and between the two knuckle arms on the innermost layer respectively, and the rope row assembly comprises a first telescopic piece and a second telescopic piece which are arranged in the knuckle arm suite and are opposite in rope row arrangement direction during stretching or retracting. The first telescopic part is connected with the four knuckle arms on the outermost layer and the first telescopic oil cylinder, the first telescopic oil cylinder and the first telescopic part are matched to drive the four knuckle arms on the outermost layer to stretch out and draw back synchronously, the second telescopic part is connected with the three knuckle arms on the innermost layer, and the second telescopic oil cylinder and the second telescopic part are matched to drive the two knuckle arms on the outermost layer to stretch out and draw back synchronously. The problem that an existing rope row mechanism is limited by the section number of a box type arm is solved, and the defect that a six-section-arm single-cylinder bolt product is low in telescopic efficiency is overcome.

Description

Technical Field

[0001] The invention belongs to the technical field of lifting equipment and relates to a novel double-cylinder six-section boom telescopic mechanism and a crane. Background Art

[0002] Currently, there are two main types of telescopic mechanisms for box-type telescopic booms: the first is a single-cylinder latch mechanism, primarily used for box-type telescopic booms with six sections or more; the second is a rope-type telescopic mechanism, primarily used for box-type telescopic booms with five sections or fewer. The rope-type telescopic mechanism's primary advantage lies in its high telescopic efficiency, enabling simultaneous telescopic movement of multiple boom sections, while a single-cylinder latch mechanism can only extend and retract one boom section at a time. However, the rope-type telescopic mechanism is structurally complex and requires a large layout space, making it generally suitable for box-type telescopic booms with five sections or fewer.

[0003] The common existing rope-row telescopic mechanism structures mainly include single-cylinder three-section arm rope-row mechanism, single-cylinder four-section arm rope-row mechanism (such as Figure 2 ) and double cylinder five-section arm rope arrangement mechanism (such as Figure 3 ), since the rope-type mechanism is limited by the number of box-type boom sections, it is usually only applicable to box-type booms with five sections or less. The extension and retraction of box-type booms with six sections or more is often achieved through a single-cylinder latch mechanism. The technical difficulty of the single-cylinder latch mechanism is much higher than that of the rope-type mechanism, and it also has high requirements for boom manufacturing. The extension and retraction efficiency of the boom is much lower than that of the rope-type mechanism. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a new double-cylinder six-section boom telescopic mechanism and crane, which solves the problem that the existing rope-row mechanism is limited by the number of sections of the box-type boom, and makes up for the shortcoming of low telescopic efficiency of the six-section boom single-cylinder latch product.

[0005] The technical solution provided by the present invention is as follows:

[0006] The present invention provides a novel double-cylinder six-section arm telescopic mechanism, comprising a section arm kit, a first telescopic oil cylinder, a second telescopic oil cylinder and a rope row assembly. The section arm kit comprises at least 6 section arms sequentially arranged from the outside to the inside, the first telescopic oil cylinder and the second telescopic oil cylinder are respectively connected between the two section arms in the outermost layer and the two section arms in the innermost layer. The rope row assembly comprises a first telescopic member and a second telescopic member arranged in opposite directions of the rope rows when extended or retracted in the section arm kit. The first telescopic member is respectively connected to the four section arms in the outermost layer and the first telescopic oil cylinder. The first telescopic oil cylinder cooperates with the first telescopic member to drive the four section arms in the outermost layer to extend and retract synchronously. The second telescopic member is respectively connected to the three section arms in the innermost layer. The second telescopic oil cylinder cooperates with the second telescopic member to drive the two section arms in the outermost layer to extend and retract synchronously.

[0007] Furthermore, the segmented arm kit includes a basic arm and a two-section arm, a three-section arm, a four-section arm, a five-section arm and a six-section arm which are sequentially sleeved in the basic arm. The first telescopic cylinder and the second telescopic cylinder are both provided with a cylinder barrel and a cylinder rod. The cylinder rod and the cylinder barrel of the first telescopic cylinder are respectively hinged to the arm tail of the basic arm and the arm tail of the two-section arm, and the cylinder rod and the cylinder barrel of the second telescopic cylinder are respectively hinged to the arm tail of the five-section arm and the arm head of the six-section arm.

[0008] Furthermore, the first telescopic member and the second telescopic member both include an arm extension module and an arm retraction module. The rope arrangement directions of the arm extension module of the first telescopic component and the arm extension module of the second telescopic member are opposite. The rope arrangement directions of the arm retraction module of the first telescopic component and the arm retraction module of the second telescopic member are opposite.

[0009] Furthermore, the boom module of the first telescopic member includes a first boom rope, a second boom rope, a first boom pulley and a second boom pulley. The first boom pulley is installed on the cylinder barrel of the first telescopic cylinder close to one end of the second telescopic cylinder. The first end of the first boom rope is connected to the arm tail of the basic arm, and the second end passes around the first boom pulley and is connected to the arm tail of the three-section arm. The second boom pulley is installed on the arm head of the two-section arm. The first end of the second boom rope is connected to the arm tail of the two-section arm, and the second end passes around the second boom pulley and is connected to the arm tail of the four-section arm.

[0010] Furthermore, the boom module of the second telescopic member includes a third boom rope and a third boom pulley, the third boom pulley is installed at the arm tail of the five-section boom, the first end of the third boom rope is connected to the arm tail of the six-section boom, and the second end passes around the third boom pulley and is connected to the arm head of the four-section boom.

[0011] Furthermore, the retracting module of the first telescopic member includes a first retracting rope, a second retracting rope, a first recovery pulley and a second recovery pulley. The first recovery pulley is installed at the arm tail of the two-section arm. The first end of the first retracting rope is connected to the arm head of the basic arm, and the second end passes around the first recovery pulley and is connected to the arm tail of the three-section arm. The second recovery pulley is installed at the arm tail of the three-section arm. The first end of the second retracting rope is connected to one end of the cylinder barrel of the first telescopic cylinder close to the second telescopic cylinder, and the second end passes around the second recovery pulley and is connected to the arm tail of the four-section arm.

[0012] Furthermore, the retracting module of the second telescopic module includes a third retracting rope and a third recovery pulley, the third recovery pulley is installed at the arm head of the five-section arm, the first end of the third retracting rope is connected to the arm tail of the six-section arm, and the second end passes around the third recovery pulley and is connected to the arm head of the four-section arm.

[0013] Furthermore, the first arm extension rope, the second arm extension rope, the third arm extension rope, the first arm retracting rope, the second arm retracting rope, and the third arm retracting rope are all steel ropes.

[0014] Furthermore, it also includes a hydraulic hose reel, which is fixedly installed on the outermost section arm of the section sleeve assembly. The two ends of the hydraulic hose wound by the hydraulic hose reel are respectively connected to the oil inlet and outlet of the second telescopic cylinder and the external hydraulic system.

[0015] The present invention also provides a crane comprising the novel double-cylinder six-section boom telescopic mechanism described above.

[0016] Beneficial effects

[0017] The present invention realizes efficient coordinated movement of multi-section arms through the first telescopic cylinder, the second telescopic cylinder and the bidirectional rope row assembly. The first telescopic cylinder drives the first telescopic part to drive the outer four-section arm to extend and retract synchronously, and the auxiliary cylinder controls the linkage of the inner three-section arm through the reversely arranged second telescopic part, which greatly improves the telescopic efficiency and stability. The reverse rope row arrangement optimizes the force transmission path, making the telescopic action smoother, which is particularly suitable for long arm extension working conditions, significantly improving the overall rigidity and synchronization accuracy, while reducing the load pressure of a single cylinder and extending the service life.

[0018] When the 1-4 sections of the arm of the present invention are extended or retracted, two-stage pulley linkage is respectively adopted to transmit the thrust of the first telescopic cylinder to the third and fourth sections of the arm step by step. The basic arm and the second section of the arm are used as anchor points to form a stable force couple structure, ensuring the synchronous displacement of the outer four sections of the arm; when the 5-6 sections of the arm are extended or retracted, the thrust of the second telescopic cylinder is converted into the linkage of the sixth and fourth sections of the arm through the first-stage pulley. This design realizes the forced synchronization of the inner arm system through the reverse traction of the upper section arm, eliminating the risk of asynchronous extension and retraction caused by gravity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a novel double-cylinder six-section arm telescopic mechanism of the present invention.

[0020] Figure 2 It is a structural diagram of an existing single-cylinder four-section arm rope arrangement mechanism.

[0021] Figure 3 It is a structural diagram of an existing double-cylinder five-section arm rope arrangement mechanism.

[0022] Explanation of the accompanying reference numerals: 1. basic arm; 2. two-section arm; 3. three-section arm; 4. four-section arm; 5. five-section arm; 6. six-section arm; 7. first telescopic cylinder; 8. second telescopic cylinder; 9. first extension arm pulley; 10. second extension arm pulley; 11. third extension arm pulley; 12. first recovery pulley; 13. second recovery pulley; 14. third recovery pulley; 15. first extension arm rope; 16. second extension arm rope; 17. third extension arm rope; 18. first retracting arm rope; 19. second retracting arm rope; 20. third retracting arm rope; 21. hydraulic hose reel. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0026] Example 1

[0027] The present invention provides a novel double-cylinder six-section arm telescopic mechanism, comprising a section arm kit, a first telescopic oil cylinder 7, a second telescopic oil cylinder 8 and a rope row assembly. The section arm kit comprises at least 6 section arms sequentially arranged from the outside to the inside, the first telescopic oil cylinder 7 and the second telescopic oil cylinder 8 are respectively connected between the two section arms in the outermost layer and the two section arms in the innermost layer. The rope row assembly comprises a first telescopic member and a second telescopic member arranged in opposite directions of the rope rows when extended or retracted in the section arm kit. The first telescopic member is respectively connected to the four section arms in the outermost layer and the first telescopic oil cylinder 7. The first telescopic oil cylinder 7 cooperates with the first telescopic member to drive the four section arms in the outermost layer to extend and retract synchronously. The second telescopic member is respectively connected to the three section arms in the innermost layer. The second telescopic oil cylinder 8 cooperates with the second telescopic member to drive the two section arms in the outermost layer to extend and retract synchronously.

[0028] The present invention realizes efficient coordinated movement of multi-section arms through the first telescopic cylinder, the second telescopic cylinder and the bidirectional rope row assembly. The first telescopic cylinder drives the first telescopic part to drive the outer four-section arm to extend and retract synchronously, and the auxiliary cylinder controls the linkage of the inner three-section arm through the reversely arranged second telescopic part, which greatly improves the telescopic efficiency and stability. The reverse rope row arrangement optimizes the force transmission path, making the telescopic action smoother, which is particularly suitable for long arm extension working conditions, significantly improving the overall rigidity and synchronization accuracy, while reducing the load pressure of a single cylinder and extending the service life.

[0029] Example 2

[0030] The embodiment of the present invention provides a new double-cylinder six-section boom telescopic mechanism, which mainly realizes the telescoping of the six-section box-type boom through a double-cylinder rope arrangement mechanism, and the telescoping sequence is that the 1-4 sections of the boom are telescoping synchronously, and the 5-6 sections of the boom are telescoping synchronously. Figure 1 As shown, it includes a section boom kit, a first telescopic oil cylinder 7, a second telescopic oil cylinder 8 and a rope row assembly. The section boom kit includes 6 section booms arranged in sequence from the outside to the inside. The specific section boom kit is composed of a basic boom 1, a second section boom 2, a third section boom 3, a fourth section boom 4, a fifth section boom 5 and a sixth section boom 6. The first telescopic oil cylinder 7 and the second telescopic oil cylinder 8 are respectively connected between the two outermost section booms and the two innermost section booms. Specifically, the extension of the second section boom 2 is achieved by the first telescopic oil cylinder 7. The first telescopic oil cylinder 7 is installed on the arm tail of the basic boom 1 and the arm tail of the second section boom 2. The second telescopic oil cylinder 8 is installed At the arm tail of the five-section arm 5 and the arm head of the six-section arm, the rope row assembly includes a first telescopic part and a second telescopic part which are arranged in opposite directions of the rope row when extending or retracting, and are provided in the arm kit. The first telescopic part is respectively connected to the basic arm 1, the second arm 2, the third arm 3, the fourth arm 4 and the first telescopic cylinder 7. The first telescopic cylinder 7 cooperates with the first telescopic part to drive the basic arm 1, the second arm 2, the third arm 3, and the fourth arm 4 to extend and retract synchronously. The second telescopic part is respectively connected to the fourth arm 4, the fifth arm 5 and the sixth arm 6. The second telescopic cylinder 8 cooperates with the second telescopic part to drive the fifth arm 5 and the sixth arm 6 to extend and retract synchronously.

[0031] In this embodiment, the first telescopic cylinder 7 and the second telescopic cylinder 8 are both provided with a cylinder barrel and a cylinder rod. The cylinder rod and the cylinder barrel of the first telescopic cylinder 7 are respectively hinged to the arm tail of the basic arm 1 and the arm tail of the two-section arm 2, and the cylinder rod and the cylinder barrel of the second telescopic cylinder 8 are respectively hinged to the arm tail of the five-section arm 5 and the arm head of the six-section arm 6.

[0032] In this embodiment, the first telescopic member and the second telescopic member both include an extending arm module and a retracting arm module. The rope arrangement directions of the extending arm module of the first telescopic assembly and the extending arm module of the second telescopic member are opposite. The rope arrangement directions of the retracting arm module of the first telescopic assembly and the retracting arm module of the second telescopic member are opposite.

[0033] In this embodiment, the boom module of the first telescopic member includes a first boom rope 15, a second boom rope 16, a first boom pulley 9 and a second boom pulley 10. The first boom pulley 9 is installed on the cylinder barrel of the first telescopic cylinder 7 at one end close to the second telescopic cylinder 8. The first end of the first boom rope 15 is connected to the arm tail of the basic arm 1, and the second end bypasses the first boom pulley 9 and is connected to the arm tail of the three-section boom 3. The second boom pulley 10 is installed at the arm head of the two-section boom 2. The first end of the second boom rope 16 is connected to the arm tail of the two-section boom 2, and the second end bypasses the second boom pulley 10 and is connected to the arm tail of the four-section boom 4.

[0034] Specifically, the extension of the two-section boom 2 is achieved by the first telescopic cylinder 7, and the extension of the three-section boom 3 is achieved by the first extension arm pulley 9 and the first extension arm rope 15. The first extension arm pulley 9 is installed on the cylinder barrel of the first telescopic cylinder 7 close to one end of the second telescopic cylinder 8, and one end of the first extension arm rope 15 is connected to the arm tail of the basic arm 1, and the other end is connected to the arm tail of the three-section boom 3; the extension of the four-section boom 4 is achieved by the second extension arm pulley 10 and the second extension arm rope 16, wherein the second extension arm pulley 10 is installed at the arm head of the three-section boom 3, and one end of the second extension arm rope 16 is connected to the arm tail of the two-section boom 2, and the other end is connected to the arm tail of the four-section boom 4.

[0035] In this embodiment, the boom module of the second telescopic member includes a third boom rope 17 and a third boom pulley 11. The third boom pulley 11 is installed at the arm tail of the five-section boom 5. The first end of the third boom rope 17 is connected to the arm tail of the six-section boom 6, and the second end passes around the third boom pulley 11 and is connected to the arm head of the four-section boom 4.

[0036] Specifically, the five-section boom 5 is extended by the third extending pulley 11 and the third telescopic rope 17. The third extending pulley 11 is installed at the arm tail of the five-section boom 5. One end of the third telescopic rope 17 is connected to the arm head of the four-section boom 4, and the other end is connected to the arm tail of the six-section boom 6. The extension of the six-section boom 6 is achieved by the second telescopic cylinder 8.

[0037] In this embodiment, the retracting module of the first telescopic member includes a first retracting rope 18, a second retracting rope 19, a first recovery pulley 12 and a second recovery pulley 13. The first recovery pulley 12 is installed at the arm tail of the two-section arm 2. The first end of the first retracting rope 18 is connected to the arm head of the basic arm 1, and the second end bypasses the first recovery pulley 12 and is connected to the arm tail of the three-section arm 3. The second recovery pulley 13 is installed at the arm tail of the three-section arm 3. The first end of the second retracting rope 19 is connected to the cylinder barrel of the first telescopic cylinder 7 close to one end of the second telescopic cylinder 8, and the second end bypasses the second recovery pulley 13 and is connected to the arm tail of the four-section arm 4.

[0038] Specifically, the retraction of the two-section boom 2 is achieved by the first telescopic cylinder 7; the retraction of the three-section boom 3 is achieved by the first recovery pulley 12 and the first retraction rope 18. The first recovery pulley 12 is installed at the arm tail of the two-section boom 2, and one end of the first retraction rope 18 is connected to the arm tail of the three-section boom 3, and the other end is connected to the arm head of the basic boom 1; the retraction of the four-section boom 4 is achieved by the second recovery pulley 13 and the second retraction rope 19. The second recovery pulley 13 is installed at the arm tail of the three-section boom 3, and one end of the second retraction rope 19 is connected to the cylinder barrel of the first telescopic cylinder 7 close to one end of the second telescopic cylinder 8, and the other end is connected to the arm tail of the four-section boom 4.

[0039] In this embodiment, the retracting module of the second telescopic module includes a third retracting rope 20 and a third recovery pulley 14. The third recovery pulley 14 is installed on the arm head of the five-section arm 5. The first end of the third retracting rope 20 is connected to the arm tail of the six-section arm 6, and the second end passes around the third recovery pulley 14 and is connected to the arm head of the four-section arm 4.

[0040] Specifically, the retraction of the five-section boom 5 is achieved through the third recovery pulley 14 and the third retraction rope 20. The third recovery pulley 14 is installed at the arm head of the five-section boom 5. One end of the third retraction rope 20 is connected to the arm head of the four-section boom 4, and the other end is connected to the arm tail of the six-section boom 6.

[0041] In this embodiment, the first arm extension rope 15, the second arm extension rope 16, the third arm extension rope 17, the first arm retracting rope 18, the second arm retracting rope 19, and the third arm retracting rope 20 are all steel ropes.

[0042] In this embodiment, a hydraulic hose reel 21 is also included. The hydraulic hose reel 21 is fixedly mounted on the outermost section arm of the section sleeve assembly. The two ends of the hydraulic hose wound by the hydraulic hose reel 21 are respectively connected to the oil inlet and outlet of the second telescopic cylinder 8 and the external hydraulic system.

[0043] Specifically, the oil circuit of the first telescopic cylinder 7 is directly connected to the main engine to achieve its telescopic movement. The oil circuit of the second telescopic cylinder 8 is connected to the second telescopic cylinder 8 by a hydraulic hose reel 21, which drives the hydraulic hose. The hydraulic hose reel 21 controls the release and retraction of the hydraulic hose according to the length of the segment sleeve assembly. The hydraulic hose reel is integrated into the outermost segment arm and automatically retracts and extends the hydraulic hose as it extends and retracts, completely eliminating the entanglement and wear problems associated with traditional piping methods. The reel's constant tension design ensures that the hose does not fold or leak during extension and retraction, ensuring a stable supply of hydraulic power to the auxiliary cylinders. This is particularly suitable for pipeline protection requirements under large-span and variable-luffing conditions.

[0044] Example 3

[0045] An embodiment of the present invention further provides a crane, comprising the novel double-cylinder six-section boom telescopic mechanism described in Example 1 or Example 2.

[0046] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make many possible changes and modifications to the technical solution of the present invention using the above technical content, or modify it into an equivalent embodiment with equivalent changes. Therefore, any changes, modifications, equivalent changes, and modifications made to the above embodiments based on the technology of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the present technical solution.

Claims

1. A new type of double-cylinder six-section arm telescopic mechanism, characterized in that: It includes a boom kit, a first telescopic oil cylinder, a second telescopic oil cylinder and a rope row assembly. The boom kit includes at least 6 booms arranged in sequence from the outside to the inside. The first telescopic oil cylinder and the second telescopic oil cylinder are respectively connected between the two outermost booms and the two innermost booms. The rope row assembly includes a first telescopic part and a second telescopic part arranged in opposite directions of the rope rows when extended or retracted in the boom kit. The first telescopic part is respectively connected to the four outermost booms and the first telescopic oil cylinder. The first telescopic oil cylinder cooperates with the first telescopic part to drive the four outermost booms to extend and retract synchronously. The second telescopic part is respectively connected to the three innermost booms. The second telescopic oil cylinder cooperates with the second telescopic part to drive the two outermost booms to extend and retract synchronously.

2. The novel double-cylinder six-section arm telescopic mechanism according to claim 1 is characterized in that: The segmented arm kit includes a basic arm and a two-section arm, a three-section arm, a four-section arm, a five-section arm and a six-section arm which are sequentially sleeved in the basic arm. The first telescopic oil cylinder and the second telescopic oil cylinder are both provided with a cylinder barrel and a cylinder rod. The cylinder rod and the cylinder barrel of the first telescopic oil cylinder are respectively hinged to the arm tail of the basic arm and the arm tail of the two-section arm. The cylinder rod and the cylinder barrel of the second telescopic oil cylinder are respectively hinged to the arm tail of the five-section arm and the arm head of the six-section arm.

3. The novel double-cylinder six-section arm telescopic mechanism according to claim 2 is characterized in that: The first telescopic member and the second telescopic member both include an arm extension module and an arm retraction module. The rope arrangement directions of the arm extension module of the first telescopic assembly and the arm extension module of the second telescopic member are opposite. The rope arrangement directions of the arm retraction module of the first telescopic assembly and the arm retraction module of the second telescopic member are opposite.

4. The novel double-cylinder six-section arm telescopic mechanism according to claim 3 is characterized in that: The boom module of the first telescopic member includes a first boom rope, a second boom rope, a first boom pulley and a second boom pulley. The first boom pulley is installed on the cylinder barrel of the first telescopic cylinder close to one end of the second telescopic cylinder. The first end of the first boom rope is connected to the arm tail of the basic arm, and the second end passes around the first boom pulley and is connected to the arm tail of the three-section arm. The second boom pulley is installed on the arm head of the two-section arm. The first end of the second boom rope is connected to the arm tail of the two-section arm, and the second end passes around the second boom pulley and is connected to the arm tail of the four-section arm.

5. The novel double-cylinder six-section arm telescopic mechanism according to claim 4 is characterized in that: The boom module of the second telescopic member includes a third boom rope and a third boom pulley. The third boom pulley is installed at the end of the five-section boom. The first end of the third boom rope is connected to the end of the six-section boom, and the second end passes around the third boom pulley and is connected to the boom head of the four-section boom.

6. The novel double-cylinder six-section arm telescopic mechanism according to claim 5 is characterized in that: The retracting module of the first telescopic member includes a first retracting rope, a second retracting rope, a first recovery pulley and a second recovery pulley. The first recovery pulley is installed at the arm tail of the two-section arm. The first end of the first retracting rope is connected to the arm head of the basic arm, and the second end passes around the first recovery pulley and is connected to the arm tail of the three-section arm. The second recovery pulley is installed at the arm tail of the three-section arm. The first end of the second retracting rope is connected to one end of the cylinder barrel of the first telescopic cylinder close to the second telescopic cylinder, and the second end passes around the second recovery pulley and is connected to the arm tail of the four-section arm.

7. The novel double-cylinder six-section arm telescopic mechanism according to claim 6 is characterized in that: The retracting module of the second telescopic module includes a third retracting rope and a third recovery pulley. The third recovery pulley is installed on the arm head of the five-section arm. The first end of the third retracting rope is connected to the arm tail of the six-section arm, and the second end passes around the third recovery pulley and is connected to the arm head of the four-section arm.

8. The novel double-cylinder six-section arm telescopic mechanism according to claim 7 is characterized in that: The first arm extension rope, the second arm extension rope, the third arm extension rope, the first arm retracting rope, the second arm retracting rope and the third arm retracting rope are all steel ropes.

9. The novel double-cylinder six-section arm telescopic mechanism according to claim 1 is characterized in that: It also includes a hydraulic hose reel, which is fixedly mounted on the outermost section arm of the section sleeve assembly. Both ends of the hydraulic hose wound by the hydraulic hose reel are respectively connected to the oil inlet and outlet of the second telescopic cylinder and the external hydraulic system.

10. A crane, characterized in that: It comprises the novel double-cylinder six-section arm telescopic mechanism described in any one of claims 1-9.

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