Self-dismounting device and method for suspension arm of small roof crane

Abstract

The invention discloses a suspension arm self-dismounting device and method for a small roof crane. The suspension arm self-dismounting device comprises a support, a pulley arranged on the support, an end fixing device arranged on the support and used for fixing, a front limiting clamping groove formed in the front end of the support, a side limiting clamping groove formed in the side face of the support, and a limiting clamping plate inserted into the front limiting clamping groove or the side limiting clamping groove. The nylon pulley arranged on the support is matched with a main lifting rope of an original roof crane, the main lifting rope can be conveniently used for lowering the detached lifting arm, the detached lifting arm can be directly placed on the ground under the permitted condition, the work of manually carrying the lifting arm to a construction elevator is omitted, and the detaching efficiency is greatly improved. The plug pin and the limiting clamping plate are main restraining parts, so that the self-dismounting device can be safely fixed on the suspension arm; the U-shaped bolt is an additional safety measure and can play a protection role when the plug pin and the limiting clamping plate fail, and the self-dismounting device is prevented from being separated from the suspension arm; the whole self-dismounting device is light in weight and convenient for operators to carry and move.

Description

Technical Field

[0001] The invention belongs to the technical field of roof cranes, and in particular relates to a self-disassembly device and method for a boom of a small roof crane. Background Art

[0002] Roof cranes are often used for the final stage of super-high-rise construction, such as the removal of large towers and the finishing work of hoisting. After the project is completed, manual dismantling is required. During the dismantling process, the dismantling of the boom is the most difficult task, because the boom is long and usually exceeds the roof structure. Some roof cranes are equipped with a tower body, which makes the roof crane higher than the roof plane. The conventional method of lowering the boom to the roof for dismantling cannot be implemented. Therefore, the boom needs to be dismantled in the air, so an auxiliary device for self-dismantling of the boom and its use method are designed. Summary of the invention

[0003] The object of the present invention is to provide a device and method for self-disassembly of the boom of a small roof crane to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a self-disassembly device for the boom of a small roof crane, comprising a bracket, a pulley is arranged on the bracket, an end fixing device for fixing is arranged on the bracket, a front limit slot is arranged at the front end of the bracket, a side limit slot is arranged on the side of the bracket, and a limit card plate is inserted into the front limit slot or the side limit slot.

[0005] Preferably, the end fixing device comprises two groups of clamping plates, each group of clamping plates is provided with two clamping plates respectively arranged on both sides of the bracket, and latches are arranged on the clamping plates.

[0006] Preferably, an auxiliary fixing device is also provided on the bracket.

[0007] Preferably, the auxiliary fixing device is configured as a U-bolt.

[0008] Preferably, the bracket includes a U-shaped frame and a pulley support frame, the pulley support frame is arranged on the U-shaped frame, and the pulley is arranged on the pulley support frame.

[0009] Preferably, reinforcing rods are also connected to the U-shaped frame and the pulley support frame.

[0010] A method for self-disassembly of a small roof crane boom comprises the following steps:

[0011] 1) Install temporary cables to hold the boom of the small roof crane;

[0012] 2) Install the boom self-disassembly device at the node near the front end of the second section of the boom head;

[0013] 3) The main lifting rope is connected to the first section of the boom at the head, the first section of the boom at the head is dismantled, and the first section of the boom at the head is placed on the tower dismantling platform or the ground by releasing the main lifting rope;

[0014] 4) Move the boom self-disassembly device to the next boom node and fix it;

[0015] 5) Disassemble the second section of the head boom according to step 3);

[0016] 6) Repeat steps 4) and 5) to the temporary cable position;

[0017] 7) Pull the boom with the luffing rope, remove the temporary guy rope, and then use the boom self-disassembly device to continue dismantling the boom to the boom position where the luffing rope is connected;

[0018] 8) Use the hand chain hoist to hold the boom, and use the boom self-disassembly device to dismantle the boom in front of the hand chain hoist fixing point;

[0019] 9) The remaining booms are quickly dismantled using the pickaxe provided with the small roof crane.

[0020] Preferably, the specific method of step 2) is: inserting the limit card plate into the front limit card slot, and inserting the latch into the card plate.

[0021] Preferably, the specific method of step 3) is: pass the main lifting rope through the pulley, use the main lifting rope to connect the lifting rope to fix the lower chord of the head boom, use the hand chain hoist to pull the belly rod of the head boom near the root, initially tighten the main lifting rope, and then remove the boom upper chord connecting pin and the lower chord connecting pin in turn; then slowly release the main lifting rope, and the hand chain hoist is released synchronously, and the operator slowly pushes out the head boom to disengage the boom joint, and regulates the release of the main lifting rope and the hand chain hoist to completely disengage the boom.

[0022] Preferably, the specific method of step 4) is: transfer the limit card plate to the side limit card slot and pull out the pin; transfer the bracket to the next boom node and perform each fixing measure in sequence.

[0023] The technical effects and advantages of the present invention are as follows: the boom self-disassembly device is composed of a bracket and some accessories. The nylon pulley equipped on the bracket matches the main hoisting rope of the original roof crane, which is convenient for lowering the dismantling boom using the main hoisting rope. If conditions permit, the dismantled boom can be directly placed on the ground, eliminating the need for manual transportation to the construction elevator, greatly improving the disassembly efficiency.

[0024] The latch and the limit plate are the main restraining components, which can securely fix the self-disassembly device to the boom; the U-bolt is an additional safety insurance measure, which can play a protective role in preventing the self-disassembly device from detaching from the boom when the latch and the limit plate fail;

[0025] The entire self-disassembly device is light in weight, making it convenient for operators to carry and move it. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the boom self-disassembly device of the small roof crane of the present invention;

[0027] Figure 2 It is a schematic diagram of the temporary cable installation structure of the present invention;

[0028] Figure 3 It is a schematic diagram of the initial installation position structure of the boom self-disassembly device of the present invention;

[0029] Figure 4 It is a schematic diagram of the bolt installation structure of the present invention;

[0030] Figure 5 It is a schematic diagram of the installation structure of the limit card plate of the present invention;

[0031] Figure 6 It is a schematic diagram of the U-bolt installation structure of the present invention;

[0032] Figure 7 It is a schematic diagram of the main suspension rope installation structure of the present invention;

[0033] Figure 8 It is a schematic diagram of the separation of the head boom and the boom of the present invention;

[0034] Fig. 9 This is a schematic diagram of the head boom of the present invention being completely separated;

[0035] Fig.10 It is a schematic diagram of the transfer structure of the boom self-disassembly device of the present invention;

[0036] Fig.11 This is a schematic diagram of the disassembly structure of the second boom section of the present invention;

[0037] Fig.12 It is a schematic diagram of the present invention of using luffing ropes to replace temporary cables to fix the boom and continue the dismantling work;

[0038] Fig.13 It is a schematic diagram of continuing the dismantling work by replacing the luffing rope with the hand chain hoist of the present invention. DETAILED DESCRIPTION

[0039] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] The present invention provides Figure 1 The self-disassembly device of the boom of a small roof crane shown in the figure comprises a bracket 1, wherein the bracket 1 is composed of a U-shaped frame and a pulley support frame, the pulley support frame is welded to the middle part of the front end of the U-shaped frame at an angle to the front side, and the pulley 5 is arranged on the pulley support frame; reinforcing rods are welded and connected to the two sides of the rear end of the U-shaped frame and the upper end of the pulley support frame, and end fixing devices for fixing are arranged at the rear ends of both sides of the bracket 1, and the end fixing devices include two groups of clamping plates 8, each group of clamping plates 8 is provided with two and are respectively arranged on both sides of the bracket 1, and pins 2 are arranged on the clamping plates 8; front limit slots 6 are arranged on both sides of the front end of the bracket 1, and side limit slots 7 are arranged at the front end of the side of the bracket 1, and the front limit slots 6 or the side limit slots 7 are inserted into the limit clamping plates 3.

[0041] Specifically, an auxiliary fixing device is also provided on the bracket 1; the auxiliary fixing device is configured as a U-shaped bolt 4.

[0042] The present invention also provides a method for self-disassembly of a boom of a small roof crane, comprising the following steps:

[0043] 1) Install the temporary cable 11, and lower the boom until the temporary cable 11 is pulled by force. Figure 2 As shown;

[0044] 2) Install the boom self-disassembly device at the node near the front end of the second section of the boom head, such as Figure 3 The specific method is: insert the limit card plate 3 into the front limit card slot 6, and it is located on one side of the boom belly rod 13, insert the pin 2 on the card plate 8, and the pin 2 is located on the lower side of the boom main chord 12, one end of the pin 2 is fixed by the R-type pin 9, and the U-type bolt 4 connects the boom belly rod 13 and the bracket 1. For specific installation methods, see Figure 4-Figure 6 .

[0045] 3) Pass the main lifting rope 14 through the pulley 5, use the main lifting rope 14 to connect the lifting rope 15 to fix the lower chord of the head boom, and use the hand chain hoist 16 to pull the belly rod near the root of the head boom. Figure 7 As shown; initially tighten the main hoist rope 14, then disassemble the upper chord connecting pin and the lower chord connecting pin of the boom in sequence; then slowly release the main hoist rope 14, and release the hand chain hoist 16 synchronously. The operator slowly pushes out the head boom to disengage the boom joint, and regulates the release of the main hoist rope 14 and the hand chain hoist 16, as shown in FIG. Figure 8 As shown, completely disengage the boom, as shown in Fig. 9 As shown; after the boom is completely lowered and detached, it can be lowered to the tower dismantling platform using the main crane or directly to the ground.

[0046] 4) Move the boom self-disassembly device to the next boom node and fix it; the specific method is: remove the U-bolt 4 to release the fixation between the bracket and the web, move the limit card plate to the side limit card slot 7, and pull out the pin 2; move the bracket to the next boom node, and do the various fixing measures in sequence; Fig.10 As shown;

[0047] 5) Disassemble the second section of the head boom according to step 3). Fig.11 As shown;

[0048] 6) Repeat steps 4) and 5) to the temporary cable position;

[0049] 7) Pull the fifth section of the boom with the luffing rope, remove the temporary cable 11, and then use the auxiliary support to continue to remove the boom to the fifth section; Fig.12 As shown;

[0050] 8) Use the hand chain hoist 16 to hold the third section of the boom, and use the boom self-disassembly device to dismantle the boom in front of the fixed point of the hand chain hoist 16, such as Fig.13 As shown;

[0051] 9) The last three sections of the boom are quickly dismantled using the pickaxe provided with the small roof crane.

[0052] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A self-disassembly device for the boom of a small roof crane, characterized in that: It comprises a bracket, a pulley is arranged on the bracket, an end fixing device for fixing is arranged on the bracket, a front limit card slot is arranged at the front end of the bracket, a side limit card slot is arranged on the side of the bracket, and a limit card plate is inserted into the front limit card slot or the side limit card slot.

2. The self-disassembly device for the boom of a small roof crane according to claim 1, characterized in that: The end fixing device comprises two groups of clamping plates, each group of clamping plates is provided with two clamping plates which are respectively arranged on both sides of the bracket, and latches are arranged on the clamping plates.

3. The self-disassembly device for the boom of a small roof crane according to claim 1, characterized in that: An auxiliary fixing device is also arranged on the bracket.

4. The self-disassembly device for the boom of a small roof crane according to claim 3, characterized in that: The auxiliary fixing device is configured as a U-bolt.

5. The self-disassembly device for the boom of a small roof crane according to claim 1, characterized in that: The bracket comprises a U-shaped frame and a pulley support frame, the pulley support frame is arranged on the U-shaped frame, and the pulley is arranged on the pulley support frame.

6. The self-disassembly device for the boom of a small roof crane according to claim 5, characterized in that: The U-shaped frame and the pulley support frame are also connected with a reinforcing rod.

7. A method for self-disassembly of a small roof crane boom according to any one of claims 1 to 6, characterized in that: The steps include: 1) Install temporary cables to hold the boom of the small roof crane; 2) Install the boom self-disassembly device at the node near the front end of the second section of the boom head; 3) The main lifting rope is connected to the first section of the boom at the head, the first section of the boom at the head is dismantled, and the first section of the boom at the head is placed on the tower dismantling platform or the ground by releasing the main lifting rope; 4) Move the boom self-disassembly device to the next boom node and fix it; 5) Disassemble the second section of the head boom according to step 3); 6) Repeat steps 4) and 5) to the temporary cable position; 7) Pull the boom with the luffing rope, remove the temporary guy rope, and then use the boom self-disassembly device to continue dismantling the boom to the boom position where the luffing rope is connected; 8) Use the hand chain hoist to hold the boom, and use the boom self-disassembly device to dismantle the boom in front of the hand chain hoist fixing point; 9) The remaining booms are quickly dismantled using the pickaxe provided with the small roof crane.

8. The method for self-disassembly of the boom of a small roof crane according to claim 7, characterized in that: The specific method of step 2) is: inserting the limit card plate into the front limit card slot, and inserting the latch into the card plate.

9. The method for self-disassembly of the boom of a small roof crane according to claim 7, characterized in that: The specific method of step 3) is: pass the main lifting rope through the pulley, use the main lifting rope to connect the lifting rope to fix the lower chord of the head boom, use the hand chain hoist to pull the belly rod of the head boom near the root, tighten the main lifting rope initially, and then remove the boom upper chord connecting pin and the lower chord connecting pin in turn; then slowly release the main lifting rope, and release the hand chain hoist synchronously, and the operator slowly pushes out the head boom to disengage the boom joint, and regulates the release of the main lifting rope and the hand chain hoist to completely disengage the boom.

10. The method for self-disassembly of the boom of a small roof crane according to claim 7, characterized in that: The specific method of step 4) is: transfer the limit card plate to the side limit card slot and pull out the pin; transfer the bracket to the next boom node and perform various fixing measures in sequence.

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