A method of and apparatus for jacking a boom

Abstract

The application discloses a jacking installation method and a jacking device, and the jacking installation method comprises the following steps: when a main arm is in a horizontal state, installing and erecting a super jacking support, installing a super jacking back plate to connect the main arm and the super jacking support, connecting at least one section of a secondary arm at one end of the main arm, arranging a lower connecting point on the secondary arm, fixing one end of the back plate on an upper connecting point, fixing one end of an oil cylinder on the lower connecting point, connecting the back plate and the oil cylinder, and making the oil cylinder in an extended state, retracting the oil cylinder, making the secondary arm have an upward trend, repeating the foregoing operation, continuously installing subsequent secondary arms, until a required length is reached, connecting a cable, connecting one end of the cable to a movable end of the super jacking support, and connecting the other end of the cable to the secondary arm, extending the oil cylinder, making it loose, disassembling any connecting end, and fixing the oil cylinder, installing a secondary arm support frame, connecting one end of the secondary arm support frame to the secondary arm, and connecting the other end of the secondary arm support frame to a middle position of the cable, and jacking the arm frame to a required angle through an amplitude-changing oil cylinder.

Description

Technical Field

[0001] The invention relates to an arm-lifting installation method and an arm-lifting device, and belongs to the technical field of mechanical engineering. Background Art

[0002] During crane operation, the primary load-bearing component is the boom system, which typically consists of a main boom and jib. For ultra-large tonnage cranes, achieving greater lifting heights and loads requires a corresponding boom length and performance. Limited by the main boom length, this can only be achieved by increasing the jib length. To meet these requirements, high performance is required within this length constraint, resulting in a relatively heavy jib and high load-bearing capacity requirements for the main boom's end structure.

[0003] like Figure 1 The figure shows the horizontal installation state of the main arm and auxiliary arm combination, including the main arm, auxiliary arm and luffing cylinder. The auxiliary arm adopts an auxiliary structure. Under the action of the auxiliary arm's own weight, the AA section position near the end of the main arm is the transition area between the main arm and the auxiliary arm, which is subject to a large bending moment and is prone to damage.

[0004] There are two common improvement schemes in the prior art: Figure 2 As shown in the figure, by improving the material strength and increasing the material specifications to increase the bending resistance and strengthen the main arm end structure, due to the structural form limitations, the bending moment generates stress concentration at the cross-sectional change, and this stress concentration state is unavoidable. At this point, whether the material size is increased or the structural features are added, the improvement effect is not obvious, that is, the structural reinforcement is not sensitive to the improvement of the stress state. Therefore, even if the stress value is improved to a relatively small extent, a large amount of material investment is required, which will increase the deadweight, production efficiency and difficulty accordingly. The complexity of the structure will also lead to a decrease in reliability. When the bending moment load caused by the deadweight of the auxiliary arm reaches a certain level, this reinforcement method cannot meet the requirements.

[0005] Another option, such as Figure 3 As shown, the ends of the main boom and front boom are equipped with corresponding pin holes. Before connecting the jib, the two boom sections are locked together with a pin, allowing the two sections to share the load. The jib can then be installed on this basis, significantly improving safety. However, once the end boom section is connected to the front boom, it is locked and cannot extend relative to the front boom during operation, affecting the overall boom length and operating height. Summary of the Invention

[0006] In order to solve the deficiencies of the prior art, the purpose of the present invention is to provide a boom installation method and a boom device, which solves the problem of excessive force on the end of the main boom during the auxiliary boom installation and boom raising and lowering process in the prior art.

[0007] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0008] A method for installing a boom includes the following steps:

[0009] With the main boom in a horizontal position, install and erect the super-lifting bracket, and install the super-lifting rear pull plate to connect the main boom and the super-lifting bracket;

[0010] At least one auxiliary arm is connected to one end of the main arm, and a lower connection point is arranged on the auxiliary arm;

[0011] Fix one end of the pull plate to the upper connection point and one end of the oil cylinder to the lower connection point, then connect the pull plate and the oil cylinder and make the oil cylinder in the extended state;

[0012] Retract the oil cylinder to make the jib tend to move upward;

[0013] Repeat the above steps and continue to install subsequent jibs until the required length is reached;

[0014] Connect the cable, one end of which is connected to the movable end of the superlift support, and the other end is connected to the jib;

[0015] Extend the oil cylinder to make it loose, dismantle any connecting end, and fix the oil cylinder;

[0016] Install the jib support frame, one end of which is connected to the jib, and the other end is connected to the middle position of the cable;

[0017] The boom is raised to the required angle by the luffing cylinder.

[0018] A boom device, using the above boom installation method, includes a main boom, a jib, a super-lifting bracket, a tensioning device and a super-lifting rear pull plate,

[0019] The fixed end of the superlift bracket is pivotally connected to the main arm;

[0020] One end of the super-lifting rear pull plate is connected to the movable end of the super-lifting bracket, and the other end is connected to the main arm;

[0021] One end of the tensioning device is connected to the super lifting bracket, and the other end is connected to the auxiliary arm.

[0022] Furthermore, the aforementioned tensioning device includes a power mechanism for extending and shortening the tensioning device, and the power mechanism is connected to the super-lifting bracket and the auxiliary arm.

[0023] Furthermore, the aforementioned tensioning device also includes a connecting structure, which serves as an extension, with one end connected to the power mechanism and the other end connected to the super-lifting bracket.

[0024] Furthermore, the aforementioned power mechanism is an oil cylinder or a winch.

[0025] Furthermore, the aforementioned connecting structure is a pull plate or a pull cable.

[0026] Furthermore, the aforementioned tensioning device includes an upper connection point, a pull plate, a cylinder and a lower connection point. The upper connection point is located in the upper middle position of the super-lifting bracket, and the lower connection point is located on the auxiliary arm. One end of the pull plate is connected to the upper connection point, and the other end is connected to the cylinder. The other end of the cylinder is connected to the lower connection point.

[0027] Furthermore, the aforementioned tensioning device is a front-tensioning cable.

[0028] The beneficial effects achieved by the present invention are:

[0029] The two stable triangular structures formed by the super-lifting bracket, super-lifting rear pull plate and main arm, as well as the tensioning device, super-lifting bracket and auxiliary arm, significantly reduce the bending moment at the end of the main arm and improve the safety during the installation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The main arm and auxiliary arm combination are installed horizontally;

[0031] Figure 2 It is a reinforcement structure at the end of the main arm in the existing technology;

[0032] Figure 3 It is the connection structure between the end arm and the front arm in the prior art;

[0033] Figure 4 The present invention is an arm structure with a tensioning device;

[0034] Figure 5 It is composed of the tensioning device of the present invention;

[0035] Figure 6 This is the first state of the arm assembly of the present invention;

[0036] Figure 7 This is the second state of the arm assembly of the present invention;

[0037] Figure 8 This is the third state of the arm assembly of the present invention;

[0038] Figure 9 This is the fourth state of the arm assembly of the present invention;

[0039] Figure 10 The invention relates to a boom structure with a super-lifting front cable.

[0040] The meanings of the reference numerals in the figure are: 1-main boom; 2-auxiliary boom; 3-luffing cylinder; 4-pin hole of front boom section; 5-latch pin; 6-pin hole of last boom section; 7-super-lifting bracket; 8-tensioning device; 9-pull rope before super-lifting; 10-pull plate after super-lifting; 11-hook; 12-auxiliary boom support frame; 13-pull rope; 81-upper connection point; 82-pull plate; 83-oil cylinder; 84-lower connection point. DETAILED DESCRIPTION

[0041] 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.

[0042] This embodiment discloses an arm-lifting device, such as Figure 4 As shown, it includes a main arm 1, a secondary arm 2, a super-lifting bracket 7, a tensioning device 8 and a super-lifting rear pull plate 10.

[0043] The fixed end of the super-lifting bracket 7 is pivotally connected to the main arm 1, one end of the super-lifting rear pull plate 10 is connected to the movable end of the super-lifting bracket 7, and the other end is connected to the main arm 1, forming a stable triangular structure between the super-lifting bracket 7, the super-lifting rear pull plate 10 and the main arm 1; one end of the tensioning device 8 is connected to the movable end of the super-lifting bracket 7, and the other end is connected to the auxiliary arm 2.

[0044] The tensioning device 8, such as Figure 5 As shown, it includes an upper connection point 81, a pull plate 82, a cylinder 83, and a lower connection point 84. The upper connection point 81 is located in the upper middle position of the superlift bracket 7, and the lower connection point 84 is located on the auxiliary arm 2 structure. One end of the pull plate 82 is connected to the cylinder 83, and the other end is connected to the upper connection point 81; the other end of the cylinder 83 is connected to the lower connection point 84. Figure 4 As shown, the super-lifting support 7, the super-tensioning device 8 and the auxiliary arm 2 form a second stable triangle structure. The design of the two stable triangle structures significantly reduces the bending moment borne by the end of the main arm 1 when the auxiliary arm is in a longer state.

[0045] The fixed end of the oil cylinder 83 can be mounted on the jib 2 or on the tensioning plate of the tensioning device 8. For convenience, it is preferably fixed to the jib. The oil cylinder has a locking function to prevent oil leakage during load-bearing, which could result in an overload and dangerous situation at the end of the main boom. Other mechanical locking mechanisms can also be used as an alternative. The oil cylinder's stroke is designed so that when it retracts, it pulls the jib upward, significantly reducing the load borne by the end of the main boom when the jib is installed.

[0046] The tensioning device's pull plate can be replaced by a cable or other connecting structure, as long as it serves the connecting function. The tensioning device's cylinder functions to extend and shorten the tensioning device, so the cylinder can be replaced by another power mechanism, such as a winch, as long as it serves the same purpose. The tensioning device can also be constructed entirely of a power mechanism, without the pull plate or other connecting structure, and still achieve the same purpose.

[0047] Considering the cost factor, the tensioning device as a whole can also be replaced by a simple connection structure without extension or shortening function. Figure 10 As shown, a pre-lift cable 9 is used instead of the tensioning device. One end of the pre-lift cable 9 is connected to the movable end of the super-lift bracket 7, and the other end is connected to the auxiliary arm 2, which also plays a role in reducing the force on the arm head.

[0048] Figure 6 、 Figure 7 、 Figure 8 and Figure 9 The following is a state diagram of the arm assembly process:

[0049] (1) The main boom 1 is in a horizontal state, the super-lifting bracket 7 is installed and erected, and the super-lifting rear pull plate 10 is installed to connect the main boom 1 and the super-lifting bracket 7;

[0050] (2) Install a small section of jib 2, which includes one or more jib sections. However, the bending moment generated should be small so that the tensioning device can achieve a better load-reducing effect after the subsequent connection is completed. Install the lower connection point 84 of the tensioning device on the installed jib section;

[0051] (3) Fix one end of the pull plate 82 to the upper connection point 81 and one end of the oil cylinder 83 to the lower connection point 84, then connect the pull plate 82 and the oil cylinder 83, and make the oil cylinder 83 in the extended state;

[0052] (4) Retract the oil cylinder 83 so that the auxiliary arm has an upward trend, such as Figure 7 As shown;

[0053] (5) Repeat steps (2), (3), and (4) to continue installing the rear jib until the required length is reached;

[0054] (6) Connect the cable 13. One end of the cable 13 is connected to the movable end of the superlift support 7, and the other end is connected to the auxiliary arm. Figure 8 As shown;

[0055] (7) Extend the oil cylinder 83 to make it loose, dismantle any connecting end, and fix it, such as Figure 9 As shown;

[0056] (8) Install the jib support frame 12, one end of which is connected to the jib, and the other end is connected to the middle position of the cable 13;

[0057] (9) Raise the boom to the required angle through the boom cylinder.

[0058] 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 boom installation method, characterized in that: The steps include: The main arm is in a horizontal state, the super-lifting bracket (7) is installed and erected, and the super-lifting rear pull plate (10) is installed to connect the main arm (1) and the super-lifting bracket (7); At least one auxiliary arm is connected to one end of the main arm, and a lower connection point (84) is arranged on the auxiliary arm; Fix one end of the pull plate (82) to the upper connection point (81) on the super-lift bracket (7), fix one end of the oil cylinder (83) to the lower connection point (84), then connect the pull plate (82) and the oil cylinder (83), and make the oil cylinder (83) in an extended state; Retract the oil cylinder (83) so that the auxiliary arm has an upward trend; Repeat the above steps and continue to install subsequent jibs until the required length is reached; Connecting a cable (13), one end of the cable (13) is connected to the movable end of the super lifting bracket (7), and the other end is connected to the auxiliary arm; The oil cylinder (83) is extended outward to relax it, and any connecting end is disassembled and the oil cylinder (83) is fixed; Install the jib support frame (12), one end of the jib support frame (12) is connected to the jib, and the other end is connected to the middle position of the cable (13); The boom is raised to the required angle by the luffing cylinder.

2. A boom installation method according to claim 1, characterized in that: The fixed end of the super-lift bracket (7) is pivotally connected to the main arm (1); One end of the super-lifting rear pull plate (10) is connected to the movable end of the super-lifting bracket (7), and the other end is connected to the main arm (1).

3. The arm installation method according to claim 1, characterized in that: The oil cylinder is replaced by a winch.

4. The arm installation method according to claim 1, characterized in that: The cable replaces the pull plate and is connected to the oil cylinder.

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