Boom raising device and boom raising method for crawler crane boom

Abstract

The present invention discloses a boom raising device and a boom raising method for a crawler crane boom. The boom raising device comprises a first luffing system and a second luffing system. The first luffing system comprises a first hoist, a first steel wire rope and a first pull plate; the second luffing system comprises a second hoist, a second steel wire rope, a second pull plate and a waist rope; the first hoist drives the first steel wire rope to extend or shorten, the first steel wire rope pulls the first pull plate, and the first pull plate pulls the boom; the second hoist drives the second steel wire rope to extend or shorten, the second steel wire rope pulls the second pull plate, and the second pull plate pulls the boom. The first luffing system and the second luffing system cooperate with each other and work in synergy with each other. Each luffing system only needs a very small luffing force to easily achieve the luffing of an extra-long boom.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, in particular to a boom raising device and a boom raising method for a crawler crane boom. Background Art

[0002] At present, the lifting work of the crawler crane boom is mainly completed by the luffing mechanism. Since the crawler crane boom is long and heavy, the lifting torque required when raising the boom is very large, which puts high demands on the luffing mechanism.

[0003] like Figure 4 The figure shows a schematic diagram of the structure of a boom device used in crawler crane booms in the prior art. The boom device includes a second luffing system, which includes a second hoist 8, a second wire rope 9, a second pull plate 10, and a waist rope 11. The second hoist 8 is located within the superlift mast 4 or on the turntable 5. One end of the second wire rope 9 is wound on the second hoist 8 and the other end is connected to the second pull plate 10. The other end of the second pull plate 10 is connected to the boom head 12 of the boom 6. The waist rope 11 has one end connected to the second pull plate 10 and the other end is connected to the middle boom section 7 of the boom 6. The second hoist 8 drives the second wire rope 9 to extend or contract, which pulls the second pull plate 10. The second pull plate 10 pulls the boom 6 to adjust the luffing. The waist rope 11 can reduce deformation of the boom 6 and ensure safety during boom raising.

[0004] When the boom device in the prior art is used to raise an extra-long boom, it is difficult to raise the boom and requires a large variable amplitude force. There are two ways to increase the variable amplitude force: one is to increase the force of the wire rope, and the other is to increase the length of the super-lift mast. Increasing the force of the wire rope requires increasing the cross-sectional area of the wire rope, the cross-sectional area of the pull plate, and the rotational force of the winch; while increasing the length of the super-lift mast requires a longer super-lift mast. Increasing the force of the wire rope requires increasing the strength of the structure, which increases the cost; and increasing the length of the super-lift mast not only increases the cost, but also significantly increases the weight of the crane, reducing the performance of the crane. Summary of the Invention

[0005] The object of the present invention is to provide a boom raising device and boom raising method for a crawler crane boom, so as to solve the problem in the prior art that when the boom raising device is used for raising an ultra-long boom, it is difficult to raise the boom and requires a large amplitude change force.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] In the first aspect, the present invention provides a boom device for a crawler crane boom, comprising a first luffing system and a second luffing system, the first luffing system comprising a first winch, a first steel wire rope and a first pull plate, the first winch being arranged in a super-lift mast or on a turntable, one end of the first steel wire rope being wound on the first winch, and the other end being connected to one end of the first pull plate, and the other end of the first pull plate being connected to the middle boom section of the boom; the second luffing system comprising a second winch, a second steel wire rope, a second pull plate and a waist rope, the second winch being arranged in a super-lift mast or on a turntable, one end of the second steel wire rope being wound on the second winch, and the other end being connected to one end of the second pull plate, and the other end of the second pull plate being connected to the arm head of the boom, and one end of the waist rope being connected to the second pull plate, and the other end being connected to the middle boom section of the boom.

[0008] Furthermore, the first steel wire rope is located below the second steel wire rope, and the first pull plate is located below the second pull plate.

[0009] Furthermore, the connection position of the waist rope and the middle arm section of the boom is located between the connection position of the first pull plate and the middle arm section of the boom and the boom head of the boom.

[0010] Furthermore, the number of waist ropes is 0-2.

[0011] Furthermore, the first pull plate is provided with a first tension sensor for detecting the force on the first pull plate and the first steel wire rope; the second pull plate is provided with a second tension sensor for detecting the force on the second pull plate and the second steel wire rope.

[0012] In a second aspect, the present invention provides a boom raising method for a crawler crane boom, the boom raising method being implemented using the above-mentioned boom raising device, and the boom raising method comprising:

[0013] The first winch is started, and while the first winch reels in the first steel wire rope, the first pull plate is pulled, and the first pull plate pulls the boom. When the force on the first pull plate and the first steel wire rope reaches a preset tension value, the first winch is closed, and the second winch is started. While the second winch reels in the second steel wire rope, the second pull plate is pulled, and the second pull plate pulls the boom to raise the boom. When the boom rotates around the turntable at a preset angle, the second winch is closed;

[0014] The cycle continues like this. When the angle between the boom and the horizontal plane reaches the specified angle θs, the second winch is turned off and the first winch is started to reverse. When the force on the first wire rope and the first pull plate reaches the preset tension value, the first winch is turned off and the boom is raised.

[0015] Furthermore, the boom raising method for a crawler crane boom also includes: detecting the force on the first pull plate and the first steel wire rope in real time by a first tension sensor; and detecting the force on the second pull plate and the second steel wire rope in real time by a second tension sensor.

[0016] Furthermore, the preset angle is 1°.

[0017] Furthermore, the preset angle is 5°.

[0018] Furthermore, the specified angle θs is less than 90°.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention provides a boom device for a crawler crane boom, comprising a first luffing system and a second luffing system. Both the first luffing system and the second luffing system can be disassembled and installed. Depending on the length of the boom, the first luffing system or the second luffing system can be selected to work alone, or the first luffing system and the second luffing system can be selected to work together, thereby improving the lifting capacity of the crane. In addition, the size and weight of the first luffing system and the second luffing system can also be appropriately reduced compared to the size and weight of the luffing system in the prior art.

[0021] The present invention provides a boom device for a crawler crane boom, wherein a first winch drives a first steel wire rope to extend or shorten, the first steel wire rope pulls a first pull plate, and the first pull plate pulls the boom; a second winch drives a second steel wire rope to extend or shorten, the second steel wire rope pulls a second pull plate, and the second pull plate pulls the boom, the first luffing system and the second luffing system cooperate with each other and work in synergy with each other, and each luffing system only requires a very small luffing force to easily achieve the luffing of an extra-long boom. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 1 is a schematic structural diagram of a boom device for a crawler crane boom provided in Example 1 of the present invention;

[0023] Figure 2 This is a working principle diagram of a boom raising method for a crawler crane boom provided in Example 2 of the present invention;

[0024] Figure 3 This is a control logic diagram of a boom raising method for a crawler crane provided in Example 2 of the present invention;

[0025] Figure 4 It is a structural diagram of an arm lifting device in the prior art.

[0026] In the figure: 1-first winch, 2-first wire rope, 3-first pull plate, 4-super lifting mast, 5-turntable, 6-lifting arm, 7-intermediate arm section, 8-second winch, 9-second wire rope, 10-second pull plate, 11-waist rope, 12-arm head. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Example 1

[0029] like Figure 1 As shown, a boom device for a crawler crane boom comprises a first luffing system and a second luffing system, the first luffing system comprising a first hoist 1, a first steel wire rope 2 and a first pull plate 3, the first hoist 1 being arranged in a super-lift mast 4 or on a turntable 5, one end of the first steel wire rope 2 being wound on the first hoist 1, and the other end being connected to one end of the first pull plate 3, the other end of the first pull plate 3 being connected to an intermediate boom section 7 of a boom 6; the second luffing system comprises a second hoist 8, a second steel wire rope 9, a second pull plate 10 and a waist rope 11, the second hoist 8 being arranged in a super-lift mast 4 or on a turntable 5, one end of the second steel wire rope 9 being wound on the second hoist 8, and the other end being connected to the first pull plate 3 One end of the two pull plates 10 is connected, and the other end of the second pull plate 10 is connected to the arm head 12 of the boom 6. One end of the waist rope 11 is connected to the second pull plate 10, and the other end is connected to the middle arm section 7 of the boom 6; the first winch 1 drives the first steel wire rope 2 to extend or shorten, the first steel wire rope 2 pulls the first pull plate 3, and the first pull plate 3 pulls the boom 6; the second winch 8 drives the second steel wire rope 9 to extend or shorten, the second steel wire rope 9 pulls the second pull plate 10, and the second pull plate 10 pulls the boom 6. The first luffing system and the second luffing system cooperate with each other and work together. Each luffing system only needs a very small luffing force to easily achieve the luffing of the extra-long boom 6.

[0030] The first steel wire rope 2 is located below the second steel wire rope 9 , and the first pull plate 3 is located below the second pull plate 10 .

[0031] The connection position of the waist rope 11 and the middle arm section 7 of the boom 6 is located between the connection position of the first pull plate 3 and the middle arm section 7 of the boom 6 and the boom head 12 of the boom 6 .

[0032] The number of waist ropes 11 is 0-2; the waist ropes 11 can reduce the bending degree of the boom 6 to prevent damage due to excessive deflection; the number of waist ropes 11 is selected according to the length of the boom 6 and the capabilities of the first and second luffing systems.

[0033] The first pull plate 3 is provided with a first tension sensor for detecting the force on the first pull plate 3 and the first steel rope 2 ; the second pull plate 10 is provided with a second tension sensor for detecting the force on the second pull plate 10 and the second steel rope 9 .

[0034] Example 2

[0035] like Figure 2 As shown, it is assumed that the maximum tension within the safety range of the first luffing system is F1max; the maximum tension within the safety range of the second luffing system is F2max; due to the gravity of the first wire rope 2, the first pull plate 3, the second wire rope 9 and the second pull plate 10, when the tension is insufficient, the first wire rope 2 and the second wire rope 9 will relax, posing a risk of entanglement. It is assumed that the minimum tension of the first luffing system that can straighten the first wire rope 2 and the first pull plate 3 is F1min; the boom moment of the boom 6 itself is M, which comes from the gravity of the boom 6 itself; the angle between the boom 6 and the horizontal plane is θ, During the boom raising process, θ gradually increases from approximately 0°, but never exceeds 90°, ultimately reaching the specified angle θs. The weight of the boom 6 remains constant. As θ increases, M gradually decreases, but remains greater than 0. Assume that the force exerted by the first luffing system on the boom 6 is F1, the vertical distance from the point where the force of the first luffing system acts on the boom 6 is X1, the force exerted by the second luffing system on the boom 6 is F2, and the vertical distance from the point where the force of the second luffing system acts on the boom 6 is X2. As θ increases, X1 and X2 gradually increase, making boom raising easier. When M is at its maximum value, the first or second luffing system alone is insufficient to independently raise the boom, requiring coordination. When the angle between the boom 6 and the horizontal plane reaches a certain value, the second luffing system alone can raise the boom. Assume that the auxiliary force required by the first luffing system during operation is f1, with the requirement that F1min < f1 < F1max. The following relationship can be expressed: M = F1 X1 + F2 X2.

[0036] like Figure 3 As shown, a boom raising method for a crawler crane boom is implemented using the above-mentioned boom raising device, and the boom raising method includes:

[0037] The first hoist 1 is started. While the first hoist 1 reels in the first steel wire rope 2, it pulls the first pull plate 3. The first pull plate 3 pulls the boom 6. The force F1 of the first luffing system on the boom 6 gradually increases until it reaches f1. When the force on the first pull plate 3 and the first steel wire rope 2 reaches f1, the first hoist 1 is shut down. The second hoist 8 is started. While the second hoist 8 reels in the second steel wire rope 9, it pulls the second pull plate 10. The second pull plate 10 pulls the boom 6 to raise the boom. When the boom 6 rotates 1° around the turntable 5, the second hoist 8 is shut down. At this time, the force F1 of the first luffing system on the boom 6 will decrease and become less than f1. The above operation is repeated.

[0038] The cycle continues like this. When the angle between the boom 6 and the horizontal plane reaches the specified angle θs, the second winch 8 is turned off and the first winch 1 is started to reverse. When the force on the first wire rope 2 and the first pull plate 3 reaches f1, the first winch 1 is turned off and the boom is raised.

[0039] The boom raising method for a crawler crane boom also includes: detecting the force on the first pull plate 3 and the first steel wire rope 2 in real time by using a first tension sensor to prevent overloading; and detecting the force on the second pull plate 10 and the second steel wire rope 9 in real time by using a second tension sensor to prevent overloading.

[0040] Example 3

[0041] The difference from the second embodiment is that the boom 6 rotates 5° around the turntable 5 .

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A method for raising the boom of a crawler crane, wherein the method is realized by a boom raising device, and wherein: The boom device comprises a first luffing system and a second luffing system, wherein the first luffing system comprises a first hoist (1), a first steel wire rope (2) and a first pull plate (3), wherein the first hoist (1) is arranged in the super-lift mast (4) or on the turntable (5), one end of the first steel wire rope (2) is wound on the first hoist (1), and the other end is connected to one end of the first pull plate (3), and the other end of the first pull plate (3) is connected to the middle arm section (7) of the boom (6); the second luffing system comprises a second hoist (8), a second steel wire rope (9), a second pull plate (10) and a waist rope (11), wherein the second hoist (8) is arranged in the super-lift mast (4) or on the turntable (5), one end of the second steel wire rope (9) is wound on the second hoist (8), and the other end is connected to one end of the second pull plate (10), and the other end of the second pull plate (10) is connected to the arm head (12) of the crane arm (6), and one end of the waist rope (11) is connected to the second pull plate (10), and the other end is connected to the middle arm section (7) of the crane arm (6); The arm raising method includes starting a first hoist (1), the first hoist (1) pulling a first pull plate (3) while reeling in a first steel wire rope (2), the first pull plate (3) pulling a boom (6), and when the force on the first pull plate (3) and the first steel wire rope (2) reaches a preset tension value, shutting down the first hoist (1), starting a second hoist (8), the second hoist (8) pulling a second pull plate (10) while reeling in a second steel wire rope (9), the second pull plate (10) pulling the boom (6) to raise the arm, and shutting down the second hoist (8) when the boom (6) rotates around the turntable (5) to a preset angle; The cycle continues in this way. When the angle between the boom (6) and the horizontal plane reaches a specified angle θs, the second hoist (8) is turned off and the first hoist (1) is started to reverse the first hoist (1). When the force on the first steel wire rope (2) and the first pull plate (3) reaches a preset tension value, the first hoist (1) is turned off and the boom is raised.

2. The boom raising method for a crawler crane boom according to claim 1, characterized in that: The first steel wire rope (2) is located below the second steel wire rope (9), and the first pull plate (3) is located below the second pull plate (10).

3. The boom raising method for a crawler crane boom according to claim 1, characterized in that: The connection position of the waist rope (11) and the middle arm section (7) of the boom (6) is located between the connection position of the first pull plate (3) and the middle arm section (7) of the boom (6) and the boom head (12) of the boom (6).

4. The boom raising method for a crawler crane boom according to claim 1, characterized in that: The number of the waist ropes (11) is 0-2.

5. The boom raising method for a crawler crane boom according to claim 1, characterized in that: The first pull plate (3) is provided with a first tension sensor for detecting the force on the first pull plate (3) and the first steel wire rope (2); the second pull plate (10) is provided with a second tension sensor for detecting the force on the second pull plate (10) and the second steel wire rope (9).

6. The boom raising method for a crawler crane boom according to claim 1, characterized in that: Also includes: The force on the first pulling plate (3) and the first steel wire rope (2) is detected in real time by a first tension sensor; The force on the second pulling plate (10) and the second steel wire rope (9) is detected in real time by the second tension sensor.

7. The boom raising method for a crawler crane according to claim 1, characterized in that: The preset angle is 1°.

8. The boom raising method for a crawler crane boom according to claim 1, characterized in that: The preset angle is 5°.

9. The boom raising method for a crawler crane boom according to claim 1, characterized in that: The specified angle θs is less than 90°.

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