Multi-section arm synchronous telescopic mechanism and crane

Abstract

The present invention discloses a multi-section boom synchronous telescopic mechanism and crane, which includes a first boom rope, a second boom rope, a telescopic device, a boom assembly, and a boom steering assembly installed on the boom assembly; the boom assembly includes a basic boom, a second boom, a third boom, a fourth boom, and a fifth boom nested in sequence; the movable end of the telescopic device is connected to the basic boom, the fixed end of the telescopic device is connected to the second boom, and the fixed front end of the telescopic device is installed with a first boom steering member; one end of the first boom rope is fixedly connected to the basic boom, the other end of the first boom rope is wound around the first boom steering member and then fixedly connected to the third boom; one end of the second boom rope is fixedly connected to the second boom, and the other end of the second boom rope is wound around the boom steering assembly and then fixedly connected to the fourth boom. The present invention solves the technical problems of the prior art five-section boom crane, such as high cost, low telescopic efficiency, and severe limitation on the lifting weight.

Description

Technical Field

[0001] The invention relates to a multi-section arm synchronous telescopic mechanism and a crane, belonging to the technical field of cranes. Background Art

[0002] At present, most of the mainstream five-section boom cranes on the market use a double-cylinder rope-type telescopic mechanism. The first telescopic cylinder controls the independent extension and retraction of the second section boom, and the second telescopic cylinder controls the extension and retraction of the third, fourth and fifth sections boom. The efficiency is low, and since the two telescopic cylinders are heavy and costly, the lifting weight under the long boom condition is seriously affected. Although some five-section boom cranes use a single-cylinder rope-type telescopic mechanism, when lifting, the force on the rope extending from the fourth section boom is twice that of the rope extending from the fifth section boom, and the force on the rope extending from the third section boom is twice that of the rope extending from the fourth section boom. The force on the rope is doubled, which seriously limits the lifting weight of the crane. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a multi-section arm synchronous telescopic mechanism and a crane to solve the technical problems of the prior art five-section arm cranes, such as high cost, low telescopic efficiency and severe limitation on lifting weight.

[0004] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0005] On the one hand, the present invention provides a multi-section arm synchronous telescopic mechanism, including a first arm rope, a second arm rope, a telescopic device, an arm section assembly and an arm steering assembly installed on the arm section assembly; the arm section assembly includes a basic arm, a two-section arm, a three-section arm, a four-section arm and a five-section arm that are nested in sequence, the movable end of the telescopic device is connected to the basic arm, the fixed end of the telescopic device is connected to the two-section arm, the fixed front end of the telescopic device is equipped with a first arm steering member, one end of the first arm rope is fixedly connected to the basic arm, the other end of the first arm rope is wrapped around the first arm steering member and then fixedly connected to the three-section arm, one end of the second arm rope is fixedly connected to the two-section arm, the other end of the second arm rope is wrapped around the arm steering assembly and then fixedly connected to the four-section arm.

[0006] Furthermore, the movable end of the telescopic device is connected to the arm tail of the basic arm, the fixed end of the telescopic device is connected to the arm tail of the two-section arm, one end of the first arm rope is fixedly connected to the arm tail of the basic arm, the other end of the first arm rope is wrapped around the first arm steering member and then fixedly connected to the arm tail of the three-section arm, one end of the second arm rope is fixedly connected to the arm tail of the two-section arm, the other end of the second arm rope is wrapped around the arm steering assembly and then fixedly connected to the arm head of the four-section arm.

[0007] Furthermore, the boom steering assembly includes a second boom steering member, a third boom steering member, a fourth boom steering member, a fifth boom steering member and a sixth boom steering member, the second boom steering member is installed on the basic boom, the third boom steering member is installed on the three-section boom, the fourth boom steering member is installed on the four-section boom, the fifth boom steering member is installed on the four-section boom, and the sixth boom steering member is installed on the five-section boom, and the other end of the second boom rope is sequentially wrapped around the second boom steering member, the third boom steering member, the fourth boom steering member, the fifth boom steering member and the sixth boom steering member and then fixedly connected to the four-section boom.

[0008] Furthermore, the second boom steering member is installed at the arm tail of the basic boom, the third boom steering member is installed at the arm head of the three-section boom, the fourth boom steering member is installed at the arm tail of the four-section boom, the fifth boom steering member is installed at the arm head of the four-section boom, and the sixth boom steering member is installed at the arm tail of the five-section boom. The other end of the second boom rope is sequentially wrapped around the second boom steering member, the third boom steering member, the fourth boom steering member, the fifth boom steering member and the sixth boom steering member and then fixedly connected to the arm head of the four-section boom.

[0009] Furthermore, it also includes a first retracting arm rope, a second retracting arm rope and a third retracting arm rope, the arm tail of the two-section arm is equipped with a first retracting arm steering member, one end of the first retracting arm rope is fixedly connected to the arm head of the basic arm, the other end of the first retracting arm rope is wrapped around the first retracting arm steering member and then fixedly connected to the arm tail of the three-section arm, the arm tail of the three-section arm is equipped with a second retracting arm steering member, one end of the second retracting arm rope is fixedly connected to the fixed front end of the telescopic device, the other end of the second retracting arm rope is wrapped around the second retracting arm steering member and then fixedly connected to the arm tail of the four-section arm, the arm tail of the four-section arm is equipped with a third retracting arm steering member, one end of the third retracting arm rope is fixedly connected to the arm head of the three-section arm, the other end of the third retracting arm rope is wrapped around the third retracting arm steering member and then fixedly connected to the arm tail of the five-section arm.

[0010] Furthermore, it also includes a fourth retracting arm rope, a fifth retracting arm rope and a sixth retracting arm rope, the arm tail of the two-section arm is installed with a fourth retracting arm steering component, one end of the fourth retracting arm rope is fixedly connected to the arm head of the base arm, the other end of the fourth retracting arm rope is wrapped around the fourth retracting arm steering component and then fixedly connected to the arm tail of the three-section arm, the arm tail of the three-section arm is installed with a fifth retracting arm steering component, one end of the fifth retracting arm rope is fixedly connected to the arm head of the two-section arm, the other end of the fifth retracting arm rope is wrapped around the fifth retracting arm steering component and then fixedly connected to the arm tail of the four-section arm, the arm tail of the four-section arm is installed with a sixth retracting arm steering component, one end of the sixth retracting arm rope is fixedly connected to the arm head of the three-section arm, the other end of the sixth retracting arm rope is wrapped around the sixth retracting arm steering component and then fixedly connected to the arm tail of the five-section arm.

[0011] Furthermore, a first connecting seat is installed at the tail of the basic arm, and the movable end of the telescopic device is hinged to the first connecting seat through a pin shaft. A second connecting seat is installed at the tail of the two-section arm, and the fixed end of the telescopic device is hinged to the second connecting seat through a pin shaft.

[0012] Furthermore, the telescopic device is a telescopic oil cylinder, the lever end of the telescopic oil cylinder is the movable end of the telescopic device, the cylinder end of the telescopic oil cylinder is the fixed end of the telescopic device, and the front end of the cylinder end of the telescopic oil cylinder is the fixed front end of the telescopic device.

[0013] Furthermore, the first boom steering member, the second boom steering member, the third boom steering member, the fourth boom steering member, the fifth boom steering member, the sixth boom steering member, the first retracted boom steering member, the second retracted boom steering member and the third retracted boom steering member are all pulleys.

[0014] Furthermore, the fourth retracting arm steering member, the fifth retracting arm steering member and the sixth retracting arm steering member are all pulleys.

[0015] On the other hand, the present invention further provides a crane comprising the above-mentioned multi-section boom synchronous telescopic mechanism.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] By providing a first boom steering member, a first boom rope wound around the first boom steering member, a boom steering assembly, and a second boom rope wound around the boom steering assembly, the forces on the first boom rope and the second boom rope of the boom assembly when the boom is extended are effectively reduced, thereby greatly increasing the lifting capacity of the crane.

[0018] By reducing the number of telescopic devices to achieve synchronous telescopic extension of two-section arms, three-section arms, four-section arms and five-section arms, not only the overall weight and cost of the multi-section arm synchronous telescopic mechanism are effectively reduced, but also the telescopic efficiency between each section arm can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of a multi-section arm synchronous telescopic mechanism provided by an embodiment of the present invention;

[0020] Figure 2 This is another structural schematic diagram of a multi-section arm synchronous telescopic mechanism provided by an embodiment of the present invention;

[0021] In the figure: 1, second boom steering member; 2, basic boom; 3, second retracted boom steering member; 4, second-section boom; 5, second retracted boom rope; 6, fourth boom steering member; 7, third-section boom; 8, third boom steering member; 9, sixth boom steering member; 10, fourth-section boom; 11, second boom rope; 12, fifth boom steering member; 13, fifth-section boom; 14, third retracted boom rope; 15, third retracted boom steering member; 16, first boom steering member; 17, first boom rope; 18, first retracted boom rope; 19, first retracted boom steering member; 20, telescopic device; 21, first connecting seat; 22, second connecting seat; 23, fourth retracted boom steering member; 24, fourth retracted boom rope; 25, fifth retracted boom steering member; 26, fifth retracted boom rope; 27, sixth retracted boom steering member; 28, sixth retracted boom rope. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Example 1:

[0026] like Figure 1As shown, a multi-section boom synchronous telescopic mechanism provided by an embodiment of the present invention includes a first boom rope 17, a second boom rope 11, a telescopic device 20, a boom assembly, and a boom steering assembly installed on the boom assembly;

[0027] The segmented arm assembly includes a basic arm 2, a second segmented arm 4, a third segmented arm 7, a fourth segmented arm 10 and a fifth segmented arm 13, which are nested in sequence. In this embodiment, the fifth segmented arm 13 is nested in the fourth segmented arm 10, the fourth segmented arm 10 is nested in the third segmented arm 7, the third segmented arm 7 is nested in the second segmented arm 4, and the second segmented arm 4 is nested in the basic arm 2. The movable end of the telescopic device 20 is connected to the arm tail of the basic arm 2, and the fixed end of the telescopic device 20 is connected to the arm tail of the second segmented arm 4. Specifically, the arm tail of the basic arm 2 is equipped with a first connecting seat 21, and the movable end of the telescopic device 20 is hinged to the first connecting seat 21 through a pin shaft. The arm tail of the second segmented arm 4 is equipped with a second connecting seat 22, and the fixed end of the telescopic device 20 is hinged to the second connecting seat 22 through a pin shaft. In this embodiment, the first connecting seat 21 is installed on the inner side of the arm tail of the basic arm 2, and the second connecting seat 22 is installed on the inner side of the arm tail of the second segmented arm 4. The fixed front end of the telescopic device 20 is equipped with a first boom steering member 16, one end of the first boom rope 17 is fixedly connected to the inner side of the boom tail of the basic boom 2, the other end of the first boom rope 17 is wrapped around the first boom steering member 16 and fixedly connected to the inner side of the boom tail of the three-section boom 7, one end of the second boom rope 11 is fixedly connected to the outer side of the boom tail of the two-section boom 4, the other end of the second boom rope 11 is wrapped around the boom steering assembly and fixedly connected to the inner side of the boom head of the four-section boom 10. Specifically, the boom steering assembly includes a second boom steering member 1, a third boom steering member 8, a fourth boom steering member 6, a fifth boom steering member 12 and a sixth boom steering member 9. In this embodiment, the second boom steering member 1 is installed on the inner side of the arm tail of the basic boom 2, the third boom steering member 8 is installed on the inner side of the arm head of the three-section boom 7, the fourth boom steering member 6 is installed on the outer side of the arm tail of the four-section boom 10, the fifth boom steering member 12 is installed on the inner side of the arm head of the four-section boom 10, and the sixth boom steering member 9 is installed on the outer side of the arm tail of the five-section boom 13. It should be noted that the other end of the second boom rope 11 is successively wrapped around the second boom steering member 1, the third boom steering member 8, the fourth boom steering member 6, the fifth boom steering member 12 and the sixth boom steering member 9 and then fixedly connected to the inner side of the arm head of the four-section boom 10.

[0028] During operation, when the telescopic device 20 is extended, the fixed end of the telescopic device 20 drives the second-section boom 4 outward. This, in turn, is driven by the first boom rope 17 and the first boom steering member 16, which in turn drives the third-section boom 7 outward. Furthermore, the second boom rope 11, the second boom steering member 1, the third boom steering member 8, the fourth boom steering member 6, the fifth boom steering member 12, and the sixth boom steering member 9, drive the fourth and fifth booms 10 and 13 to extend outward synchronously. When lifting, if the load on the boom head of the fifth boom 13 is T, then the force on the second boom rope 11 is T / 2. Since the second boom rope 11 simultaneously drives the fourth and fifth booms 10 and 13 outward, the force on the second boom rope 11 is not doubled. The first boom rope 17 drives the third boom 7 outward, so the force on the first boom rope 17 is T. The present invention effectively reduces the force on the first boom rope 17 and the second boom rope 11 of the boom assembly when the boom is in the extended state by providing a first boom steering member 16, a first boom rope 17 wound around the first boom steering member 16, a boom steering assembly, and a second boom rope 11 wound around the boom steering assembly, thereby greatly improving the lifting weight of the crane.

[0029] Optional, such as Figure 1 As shown, a multi-section arm synchronous telescopic mechanism provided by the present invention also includes a first telescopic arm rope 18, a second telescopic arm rope 5 and a third telescopic arm rope 14. Specifically, a first telescopic arm steering member 19 is installed on the outer side of the arm tail of the two-section arm 4, one end of the first telescopic arm rope 18 is fixedly connected to the inner side of the arm head of the basic arm 2, and the other end of the first telescopic arm rope 18 is fixedly connected to the outer side of the arm tail of the three-section arm 7 after being wrapped around the first telescopic arm steering member 19, and a second telescopic arm steering member 3 is installed on the outer side of the arm tail of the three-section arm 7, one end of the second telescopic arm rope 5 is fixedly connected to the fixed front end of the telescopic device 20, the other end of the second telescopic arm rope 5 is fixedly connected to the outer side of the arm tail of the four-section arm 10 after being wrapped around the second telescopic arm steering member 3, and a third telescopic arm steering member 15 is installed on the outer side of the arm tail of the four-section arm 10, one end of the third telescopic arm rope 14 is fixedly connected to the inner side of the arm head of the three-section arm 7, and the other end of the third telescopic arm rope 14 is fixedly connected to the outer side of the arm tail of the five-section arm 13 after being wrapped around the third telescopic arm steering member 15.

[0030] During application, when the telescopic device 20 contracts, the fixed end of the telescopic device 20 drives the second-section arm 4 to contract inward, and under the action of the first retracting arm rope 18 and the first retracting arm steering member 19, drives the third-section arm 7 to contract inward, and under the action of the second retracting arm rope 5 and the second retracting arm steering member 3, drives the fourth-section arm 10 to contract inward, and under the action of the third retracting arm rope 14 and the third retracting arm steering member 15, drives the fifth-section arm 13 to contract inward.

[0031] Optional, such as Figure 2As shown, a multi-section arm synchronous telescopic mechanism provided by the present invention also includes a fourth arm retraction rope 24, a fifth arm retraction rope 26 and a sixth arm retraction rope 28. The fourth arm retraction steering member 23 is installed on the outer side of the arm tail of the two-section arm 4, one end of the fourth arm retraction rope 24 is fixedly connected to the inner side of the arm head of the base arm, and the other end of the fourth arm retraction rope 24 is wrapped around the fourth arm retraction steering member 23 and then fixedly connected to the outer side of the arm tail of the three-section arm 7, and the fifth arm retraction steering member 25 is installed on the outer side of the arm tail of the three-section arm 7, one end of the fifth arm retraction rope 26 is fixedly connected to the inner side of the arm head of the two-section arm 4, the other end of the fifth arm retraction rope 26 is wrapped around the fifth arm retraction steering member 25 and then fixedly connected to the outer side of the arm tail of the four-section arm 10, and the sixth arm retraction steering member 27 is installed on the arm tail of the four-section arm 10, one end of the sixth arm retraction rope 28 is fixedly connected to the inner side of the arm head of the three-section arm 7, and the other end of the sixth arm retraction rope 28 is wrapped around the sixth arm retraction steering member 27 and then fixedly connected to the outer side of the arm tail of the five-section arm 13.

[0032] During application, when the telescopic device 20 contracts, the fixed end of the telescopic device 20 drives the second-section arm 4 to contract inward, and under the action of the fourth telescopic arm rope 24 and the fourth telescopic arm steering member 23, drives the third-section arm 7 to contract inward, under the action of the fifth telescopic arm rope 26 and the fifth telescopic arm steering member 25, drives the fourth-section arm 10 to contract inward, and under the action of the sixth telescopic arm rope 28 and the sixth telescopic arm steering member 27, drives the fifth-section arm 13 to contract inward.

[0033] In one embodiment, the telescopic device 20 is a telescopic oil cylinder. It should be noted that in this embodiment, the lever end of the telescopic oil cylinder is the movable end of the telescopic device 20, the cylinder end of the telescopic oil cylinder is the fixed end of the telescopic device 20, and the front end of the cylinder end of the telescopic oil cylinder is the fixed front end of the telescopic device 20.

[0034] In one embodiment, the first arm extension rope 17, the second arm extension rope 11, the first arm retracting rope 18, the second arm retracting rope 5, the third arm retracting rope 14, the fourth arm retracting rope 24, the fifth arm retracting rope 26 and the sixth arm retracting rope 28 are all pull ropes.

[0035] In one embodiment, the first boom steering member 16, the second boom steering member 1, the third boom steering member 8, the fourth boom steering member 6, the fifth boom steering member 12, the sixth boom steering member 9, the first retracted arm steering member 19, the second retracted arm steering member 3, the third retracted arm steering member 15, the fourth retracted arm steering member 23, the fifth retracted arm steering member 25 and the sixth retracted arm steering member 27 are all pulleys.

[0036] Example 2:

[0037] The embodiment of the present invention further provides a crane comprising the aforementioned multi-section boom synchronous telescopic mechanism. Since the technical improvements and technical effects of the crane are the same as those of the aforementioned multi-section boom synchronous telescopic mechanism, the crane will not be described in detail.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multi-section arm synchronous telescopic mechanism, characterized in that: The invention comprises a first boom rope, a second boom rope, a telescopic device, a boom section assembly and a boom steering assembly installed on the boom section assembly; the boom section assembly comprises a basic boom, a second boom, a third boom, a fourth boom and a fifth boom nested in sequence, the movable end of the telescopic device is connected to the basic boom, the fixed end of the telescopic device is connected to the second boom, the fixed front end of the telescopic device is installed with a first boom steering member, one end of the first boom rope is fixedly connected to the basic boom, the other end of the first boom rope is wound around the first boom steering member and then fixedly connected to the third boom, one end of the second boom rope is fixedly connected to the second boom, the other end of the second boom rope is wound around the boom steering assembly and then fixedly connected to the fourth boom; The movable end of the telescopic device is connected to the arm tail of the basic arm, the fixed end of the telescopic device is connected to the arm tail of the two-section arm, one end of the first boom rope is fixedly connected to the arm tail of the basic arm, the other end of the first boom rope is wrapped around the first boom steering member and then fixedly connected to the arm tail of the three-section boom, one end of the second boom rope is fixedly connected to the arm tail of the two-section boom, the other end of the second boom rope is wrapped around the boom steering assembly and then fixedly connected to the arm head of the four-section boom; The arm tail of the three-section arm is installed with a second retracting arm steering member, one end of the first retracting arm rope is fixedly connected to the arm head of the basic arm, the other end of the first retracting arm rope is wrapped around the first retracting arm steering member and then fixedly connected to the arm tail of the three-section arm, the arm tail of the three-section arm is installed with a second retracting arm steering member, one end of the second retracting arm rope is fixedly connected to the fixed front end of the telescopic device, the other end of the second retracting arm rope is wrapped around the second retracting arm steering member and then fixedly connected to the arm tail of the four-section arm, the arm tail of the four-section arm is installed with a third retracting arm steering member, one end of the third retracting arm rope is fixedly connected to the arm head of the three-section arm, the other end of the third retracting arm rope is wrapped around the third retracting arm steering member and then fixedly connected to the arm tail of the five-section arm; The tail of the basic arm is equipped with a first connecting seat, and the movable end of the telescopic device is hinged to the first connecting seat through a pin shaft. The tail of the two-section arm is equipped with a second connecting seat, and the fixed end of the telescopic device is hinged to the second connecting seat through a pin shaft.

2. The multi-section arm synchronous telescopic mechanism according to claim 1, characterized in that: The boom steering assembly includes a second boom steering member, a third boom steering member, a fourth boom steering member, a fifth boom steering member and a sixth boom steering member. The second boom steering member is installed on the basic boom, the third boom steering member is installed on the three-section boom, the fourth boom steering member is installed on the four-section boom, the fifth boom steering member is installed on the four-section boom, and the sixth boom steering member is installed on the five-section boom. The other end of the second boom rope is sequentially wound around the second boom steering member, the third boom steering member, the fourth boom steering member, the fifth boom steering member and the sixth boom steering member and then fixedly connected to the four-section boom.

3. The multi-section arm synchronous telescopic mechanism according to claim 2, characterized in that: The second boom steering member is installed at the arm tail of the basic boom, the third boom steering member is installed at the arm head of the three-section boom, the fourth boom steering member is installed at the arm tail of the four-section boom, the fifth boom steering member is installed at the arm head of the four-section boom, and the sixth boom steering member is installed at the arm tail of the five-section boom. The other end of the second boom rope is sequentially wrapped around the second boom steering member, the third boom steering member, the fourth boom steering member, the fifth boom steering member and the sixth boom steering member and then fixedly connected to the arm head of the four-section boom.

4. The multi-section arm synchronous telescopic mechanism according to claim 3, characterized in that: The arm tail of the three-section arm is installed with a fifth retracting arm steering component, one end of the fourth retracting arm rope is fixedly connected to the arm head of the base arm, the other end of the fourth retracting arm rope is wrapped around the fourth retracting arm steering component and then fixedly connected to the arm tail of the three-section arm, the arm tail of the three-section arm is installed with a fifth retracting arm steering component, one end of the fifth retracting arm rope is fixedly connected to the arm head of the two-section arm, the other end of the fifth retracting arm rope is wrapped around the fifth retracting arm steering component and then fixedly connected to the arm tail of the four-section arm, the arm tail of the four-section arm is installed with a sixth retracting arm steering component, one end of the sixth retracting arm rope is fixedly connected to the arm head of the three-section arm, the other end of the sixth retracting arm rope is wrapped around the sixth retracting arm steering component and then fixedly connected to the arm tail of the five-section arm.

5. The multi-section arm synchronous telescopic mechanism according to claim 1, characterized in that: The telescopic device is a telescopic oil cylinder, the lever end of the telescopic oil cylinder is the movable end of the telescopic device, the cylinder end of the telescopic oil cylinder is the fixed end of the telescopic device, and the cylinder front end of the telescopic oil cylinder is the fixed front end of the telescopic device.

6. The multi-section arm synchronous telescopic mechanism according to claim 1, characterized in that: The first boom steering member, the second boom steering member, the third boom steering member, the fourth boom steering member, the fifth boom steering member, the sixth boom steering member, the first retracted boom steering member, the second retracted boom steering member and the third retracted boom steering member are all pulleys.

7. The multi-section arm synchronous telescopic mechanism according to claim 4, characterized in that: The fourth retracting arm steering member, the fifth retracting arm steering member and the sixth retracting arm steering member are all pulleys.

8. A crane, characterized in that: It comprises the multi-section arm synchronous telescopic mechanism according to any one of claims 1 to 7.

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