Support arm with spreader device

Abstract

The utility model discloses a kind of lifting appliance devices for support arm, including lifting appliance frame body and fixed counterweight, one end of lifting appliance frame body is equipped with connecting seat, connecting seat is detachably connected with the end of support arm away from tower body, to form hoisting combination, the upper side of lifting appliance frame body is equipped with first hoisting part and second hoisting part, connecting seat, first hoisting part and second hoisting part are sequentially spaced apart in the length direction of lifting appliance frame body, fixed counterweight is located at the end of lifting appliance frame body away from connecting seat, fixed counterweight is set to enable the gravity center of lifting appliance device to be located between first hoisting part and second hoisting part, the gravity center of hoisting combination can be made to be compared with the gravity center of the support arm hoisted alone and move out, then even if luffing tower crane exists minimum amplitude limit, through tower crane main hoist can directly hoist support arm to contact with tower body, hoist in place once, without using other hoisting device again, play the role of reducing installation cost, improving installation efficiency, enhancing product competitiveness.

Description

Technical Field

[0001] This utility model belongs to the technical field of tower cranes, and in particular relates to a lifting device for a support arm. Background Technology

[0002] Once a tower crane's operating height exceeds its freestanding height, it generally requires an anchoring device to connect the tower body to the building to ensure the crane's stability. However, some tower cranes (e.g., wind-powered jib tower cranes) are installed near buildings, making anchoring impossible. In such cases, to ensure a higher freestanding height, a self-supporting support arm can be added to the upper section of the tower body. The tie rod structure in the self-supporting device can be located between the support arm and the tower base, and tensioned by a tensioning cylinder.

[0003] However, due to the minimum boom radius limitation of luffing tower cranes, during the installation of the support jib, if the main hoist of the luffing tower crane is used for lifting, there will still be a certain gap between the support jib mounting lugs and the tower body, making it impossible to lift it directly into place. This necessitates the use of an electric hoist and slings, or the addition of an auxiliary lifting mechanism to the counterweight boom of the luffing tower crane, or the use of a truck crane to solve the installation problem. This significantly increases installation costs and reduces installation efficiency, weakening the product's competitiveness. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies, this utility model provides a lifting device for a support boom, which aims to solve the technical problem that the main crane of a luffing tower crane cannot directly lift the support boom into place.

[0005] To achieve the above objectives, the first aspect of this utility model provides a lifting device for a support arm, wherein the lifting device for the support arm includes a lifting frame and a fixed counterweight; one end of the lifting frame is provided with a connecting seat, which is used to detachably connect to the end of the support arm away from the tower body to form a lifting assembly; the upper side of the lifting frame is provided with a first lifting part and a second lifting part that can be connected to the lifting rope on the main hoist of the tower crane, and the connecting seat, the first lifting part and the second lifting part are arranged sequentially at intervals along the length of the lifting frame; the fixed counterweight is provided at the end of the lifting frame away from the connecting seat, and the fixed counterweight is configured to make the center of gravity of the lifting device located between the first lifting part and the second lifting part.

[0006] In one embodiment of this utility model, the lifting frame includes a triangular truss, which has an upper chord and two lower chords. The two lower chords are arranged at intervals relative to each other on the lower side of the upper chord. The upper chord is located between the two lower chords and is connected to the lower chords through a support rod. A connecting seat is located at one end of the upper chord. A first lifting part and a second lifting part are arranged at intervals on the upper side of the upper chord. A fixed counterweight is located on the lower side of the triangular truss.

[0007] In one embodiment of the present invention, the support rod includes a first end rod, one end of the triangular truss is provided with a first end rod between the upper chord and the lower chord, and a second end rod is provided between the two lower chords to enclose and form a triangular frame.

[0008] In one embodiment of the present invention, the upper chord is connected to a support rod on its lower side, which is correspondingly provided with the first hoisting part and / or the second hoisting part.

[0009] In one embodiment of the present invention, the connecting seat includes a mounting base plate and two connecting lugs. The mounting base plate is located at one end of the lifting frame, and the two connecting lugs are arranged at intervals relative to each other on the side of the mounting base plate away from the lifting frame. The gap between the two connecting lugs is used for the support arm to be inserted and connected.

[0010] In one embodiment of the present invention, the lifting frame further includes a square truss disposed on the lower side of the triangular truss, and a fixed counterweight is disposed on the bottom frame of the triangular truss and / or the square truss.

[0011] In one embodiment of the present invention, the connecting seat is provided with a first connecting part and a second connecting part at intervals from top to bottom, and the first connecting part and the second connecting part are used to connect to the support arm pin, respectively.

[0012] In one embodiment of this utility model, the lifting frame is provided with a platform and a climbing frame near the connecting seat.

[0013] In one embodiment of this utility model, the second lifting part is located at the end of the lifting frame away from the connecting seat.

[0014] In one embodiment of this utility model, the fixed counterweight is a concrete component.

[0015] Through the above technical solution, the support arm lifting device provided by this utility model has the following beneficial effects: When the support boom is hoisted and installed using the aforementioned lifting device, the lifting device frame can be detached and connected to the end of the support boom furthest from the tower body via a connecting seat to form a hoisting assembly, thus extending the overall hoisting length. Simultaneously, a fixed counterweight is positioned at the end of the lifting device frame furthest from the connecting seat, causing the center of gravity of the hoisting assembly (support boom and lifting device) to shift outwards compared to the center of gravity of a single hoisted support boom, tilting towards the side of the support boom furthest from the tower body. This allows one sling on the tower crane's main hoist to connect to the support boom, and the other sling to connect to either the first or second hoisting section on the lifting device frame. This ensures balanced hoisting of the assembly. Even with minimum boom radius limitations on the tower crane, the increased length between the tower crane's main hoist and the support boom's installation end allows the main hoist to directly hoist the support boom to contact the tower body in one go, eliminating the need for additional hoisting devices. This reduces installation costs, improves installation efficiency, and enhances product competitiveness. Furthermore, after the mounting end of the support arm is fixed to the tower body, the fixed counterweight is designed to ensure that the center of gravity of the lifting device is located between the first and second lifting sections. The two lifting ropes of the tower crane's main crane can also be connected to the first and second lifting sections respectively. Thus, after disassembling the connection between the support arm and the boom beam, the lifting device can be lowered by the tower crane's main crane.

[0016] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings: Figure 1 This is a schematic diagram of the support arm lifting device according to an embodiment of the present utility model. Figure 2 This is a schematic diagram of the support arm lifting device according to another perspective of one embodiment of the present utility model; Figure 3 This is a structural schematic diagram of a triangular truss according to an embodiment of the present utility model; Figure 4 This is a structural schematic diagram of a square truss according to an embodiment of the present utility model; Figure 5 This is a structural schematic diagram of the support arm according to one embodiment of the present utility model; Figure 6This is a schematic diagram of the lifting assembly being lifted on a tower crane according to one embodiment of the present invention; Figure 7 This is a schematic diagram of the lifting assembly being lifted on the main crane of a tower crane according to one embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the hoisting assembly according to one embodiment of the present invention, which is lifted on a tower crane to the position where the support arm connects to the tower body; Figure 9 This is a schematic diagram of the lifting device according to an embodiment of the present invention being used for lowering from a tower crane; Figure 10 This is a schematic diagram of the lifting device according to an embodiment of the present invention being used for lowering from the main crane of a tower crane.

[0018] Explanation of reference numerals in the attached figures: 100. Lifting frame; 110. Triangular truss; 111. Base frame; 112. Lower chord; 113. Second web member; 114. Diagonal side frame; 115. Upper chord; 116. First web member; 117. First end member; 118. Second end member; 120. Square truss; 121. Assembly / disassembly module; 130. Connecting seat; 131. Mounting base plate; 132. Connecting lug; 133. First connecting part; 134. Second connecting part 140. First hoisting section; 150. Second hoisting section; 160. Platform; 170. Climbing frame; 200. Fixed counterweight; 300. Main hoist of tower crane; 301. First hoisting rope; 302. Second hoisting rope; 303. Third hoisting rope; 400. Support arm; 410. Third hoisting section; 420. Upper mounting rod; 430. Lower mounting rod; 431. Stirrup; 440. First installation section; 450. Second installation section; 500. Tower body. Detailed Implementation

[0019] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0020] The following description of the support arm lifting device of this utility model is based on the accompanying drawings.

[0021] like Figures 1 to 10 As shown, this utility model provides a lifting device for a support arm, wherein the lifting device for the support arm includes: The lifting frame 100 has a connecting seat 130 at one end. The connecting seat 130 is used to detach and connect to the end of the support arm 400 away from the tower body 500 to form a lifting assembly. The upper side of the lifting frame 100 is provided with a first lifting part 140 and a second lifting part 150 that can be connected to the lifting rope on the main crane 300 of the tower crane, respectively. The connecting seat 130, the first lifting part 140 and the second lifting part 150 are arranged at intervals along the length of the lifting frame 100. A fixed counterweight 200 is provided at one end of the lifting frame 100 away from the connecting seat 130. The fixed counterweight 200 is configured to make the center of gravity of the lifting device located between the first lifting part 140 and the second lifting part 150.

[0022] When the support boom 400 is hoisted and installed using the aforementioned lifting device, the lifting device frame 100 can be detached and connected to the end of the support boom 400 away from the tower body 500 via the connecting seat 130 to form a hoisting assembly, thus extending the overall hoisting length. Simultaneously, a fixed counterweight 200 is located at the end of the lifting device frame 100 away from the connecting seat 130, allowing the center of gravity of the hoisting assembly consisting of the support boom 400 and the lifting device to shift outwards compared to the center of gravity of the support boom 400 hoisted alone, tilting towards the side of the support boom 400 away from the tower body 500. This allows one of the lifting ropes on the tower crane main hoist 300 to be connected to the support boom 400, and the other lifting rope to be connected to the first hoisting part 140 or the second hoisting part 150 on the lifting device frame 100, achieving balanced hoisting of the assembly. Specifically, as shown... Figures 6 to 8 As shown, even with the minimum radius limitation of the luffing jib tower crane, the increased length between the main crane 300 and the installation end of the support jib 400 allows the main crane 300 to directly hoist the support jib 400 to contact the tower body 500 in one go, eliminating the need for other hoisting devices. This reduces installation costs, improves installation efficiency, and enhances product competitiveness. Furthermore, as... Figures 8 to 10 As shown, after the mounting end of the support arm 400 is fixed to the tower body 500, since the fixed counterweight 200 is designed to make the center of gravity of the lifting device located between the first lifting section 140 and the second lifting section 150, the two lifting ropes of the tower crane main crane 300 can be connected to the first lifting section 140 and the second lifting section 150 respectively. Thus, after disassembling the connection between the support arm 400 and the boom beam, the lifting device can be lowered by the tower crane main crane 300.

[0023] It should be noted that the weight of the support arm 400 can reach several tons. When the lifting length is extended by the spreader frame 100 and the lifting assembly can be lifted in a balanced manner, in order to reduce costs, the weight of the spreader frame 100 can be set to be smaller than that of the support arm 400. A fixed counterweight 200 can be added to the end of the spreader frame 100 away from the support arm 400 to achieve the purpose of balanced lifting. Specifically, one end of the support arm 400 is provided with a first mounting part 440 and a second mounting part 450, which are detachably connected to the tower body 500, at intervals along the height direction. The first mounting part 440 and the second mounting part 450 are respectively provided on the upper mounting rod 420 and the lower mounting rod 430. Of course, this utility model is not limited to this. The position of the support arm 400 for connecting with the tower body 500 is not limited to two places. It can be set at one or more places. In addition, the support arm 400 is provided with a third lifting part 410 at a position away from the lifting frame 100. The center of gravity of the lifting assembly can be set at the position between the second lifting part 150 and the third lifting part 410, preferably at the midpoint between the two. The midpoint between the two can be set at the connection point between the lifting frame 100 and the support arm 400. Then, when the lifting assembly is lifted, the two lifting ropes on the tower crane main hoist 300 can be connected to the second lifting part 150 and the third lifting part 410, respectively. All lifting components can be designed with perforated structures. However, this invention is not limited to this; the lifting assembly and the lowering device in this invention are not strictly limited to being perfectly horizontal, and a slight tilt is also acceptable.

[0024] See Figures 1 to 3 In one embodiment of the present invention, the lifting frame 100 includes a triangular truss 110, which has an upper chord 115 and two lower chords 112. The two lower chords 112 are arranged at intervals on the lower side of the upper chord 115. The upper chord 115 is located between the two lower chords 112 and is connected to the lower chords 112 by a support rod. The connecting seat 130 is located at one end of the upper chord 115. The first lifting part 140 and the second lifting part 150 are arranged at intervals on the upper side of the upper chord 115. The fixed counterweight 200 is located on the lower side of the triangular truss 110. By setting the lifting frame 100 to include a triangular truss 110, on the one hand, the two lower chords 112 in the triangular truss 110 are located on the lower side, which facilitates the setting of the counterweight 200 and its horizontal placement. On the other hand, after being connected to the support arm 400 through the connecting seat 130, the upper chord 115 and the upper mounting rod 420 of the support arm 400 can both be set horizontally in the same vertical plane. Furthermore, the upper chord 115 is provided with a first lifting part 140 and a second lifting part 150, and the upper mounting rod 420 is provided with a third lifting part 410. This ensures that the lifting ropes used for lifting on the tower crane main hoist 300 are located in the same vertical plane or are close to being located in the same vertical plane, thereby improving the stability of the lifting combination.

[0025] Specifically, the triangular truss 110 is configured to include a base frame 111 and diagonal side frames 114. The base frame 111 is formed by two lower chord members 112. The diagonal side frames 114 are located on the upper side of the base frame 111 and include an upper chord member 115 and a support member. The upper chord member 115 is arranged parallel to the lower chord member 112 and is located between the two lower chord members 112. The upper chord member 115 is connected to the two lower chord members 112 through the support member.

[0026] In one embodiment of this utility model, the support rod includes a first end rod 117. One end of the triangular truss 110 has the first end rod 117 between the upper chord 115 and the lower chord 112, and a second end rod 118 between the two lower chords 112, to form a triangular frame. Specifically, the connecting seat 130 is positioned corresponding to the upper vertex of the triangular frame and is connected to the first end rods 117 on both sides of the upper chord 115. By adding a triangular frame to one end of the triangular truss 110, the overall strength of the triangular truss 110 is enhanced, and the installation of the connecting seat 130 is facilitated, thereby strengthening the connection strength of the connecting seat 130 on the triangular truss 110. More specifically, the support rod between the upper chord 115 and the lower chord 112 includes not only the first end rod 117, but also a first web rod 116. The first web rod 116 can connect the upper chord 115 and the lower chord 112 at other positions, and the diameter of the first end rod 117 can be set to be larger than the diameter of the first web rod 116. The two lower chords 112 in the bottom frame 111 can be connected not only at their ends via a second end rod 118, but also via a second web rod 113 at other positions. The diameter of the second end rod 118 can be set to be larger than the diameter of the second web rod 113. Furthermore, this invention is not limited to these connections; the connecting seat 130 can also be directly connected to the upper chord 115.

[0027] In one embodiment of this utility model, the upper chord 115 is connected to a support rod on its lower side, corresponding to the first lifting part 140 and / or the second lifting part 150. By setting the support rod connecting the upper chord 115 and the lower chord 112 to correspond to the first lifting part 140 or the second lifting part 150, the corresponding lifting part can be strengthened. Further, the support rod at this position can be a first web member 116. Four first web members 116 are connected to the lower side of the upper chord 115, corresponding to the first lifting part 140 and / or the second lifting part 150. Two of the first web members 116 are located between the upper chord 115 and one of the lower chord members 112, and are inclined away from each other in the extension direction toward the corresponding lower chord member 112. The other two first web members 116 are located between the upper chord 115 and another lower chord member 112, and are inclined away from each other in the extension direction toward the corresponding lower chord member 112. With the above arrangement, the first web member 116 not only connects the upper chord 115 and the lower chord 112, but also provides further support and reinforcement for the positions on the upper chord 115 where the first lifting part 140 and / or the second lifting part 150 are located. Specifically, when the second lifting part 150 is located at the end of the upper chord 115 away from the connecting seat 130, and the first lifting part 140 is located at a relatively midpoint between the two ends of the upper chord 115, the span between the two first web members 116 corresponding to and on the same side of the first lifting part 140 can be set to be greater than the span between the two first web members 116 corresponding to and on the same side of the second lifting part 150.

[0028] In one embodiment of this utility model, the connecting seat 130 includes a mounting base plate 131 and two connecting lugs 132. The mounting base plate 131 is located at one end of the lifting frame 100, specifically at the upper vertex of the triangular frame, and is connected to the first end rods 117 on both sides of the upper chord 115. The two connecting lugs 132 are spaced apart on the side of the mounting base plate 131 away from the lifting frame 100, and the gap between the two connecting lugs 132 is used for the insertion connection of the support arm 400. The two connecting lugs 132 facilitate connection with the support arm 400 and also serve as a bidirectional stop and limit. Specifically, the connecting lugs 132 can be approximately triangular or trapezoidal, preferably a right trapezoid with a smaller upper side and a larger lower side. The first connecting part 133 is located near the upper end, and the second connecting part 134 is located near the outer corner of the lower end.

[0029] See Figure 1 , Figure 2 and Figure 4In one embodiment of this utility model, the lifting frame 100 further includes a square truss 120 disposed below the triangular truss 110, and a fixed counterweight 200 is disposed on the bottom frame 111 of the triangular truss 110 and / or the square truss 120. The addition of the square truss 120 increases the weight of the lifting frame 100 and stabilizes it. Specifically, when adding the square truss 120, the fixed counterweight 200 can be disposed on the bottom frame 111 and / or the square truss 120, but is preferably disposed on the bottom frame 111, so that the triangular truss 110 can be used independently without the square truss 120.

[0030] In one embodiment of this utility model, the square truss 120 and the base frame 111 are designed to be detachably connected. This facilitates transportation. Furthermore, if the fixed counterweight 200 is placed on the base frame 111, two usage methods can be achieved: one is the combination of the square truss 120 and the triangular truss 110, and the other is the use of the triangular truss 110 alone.

[0031] Specifically, the square truss 120 is provided with a disassembly module 121. The disassembly module 121 includes two upright plates spaced apart on the square truss 120 and a retaining shaft. The lower chord 112 of the bottom frame 111 can be placed between the two upright plates. The retaining shaft passes through the two upright plates sequentially on the upper side of the lower chord 112 to restrict the position of the lower chord 112. Specifically, the retaining shaft can be a locking pin. Of course, this utility model is not limited to this; other suitable disassembly and connection structures are also possible.

[0032] Please see again Figures 1 to 3 In one embodiment of this utility model, the connecting seat 130 is provided with a first connecting portion 133 and a second connecting portion 134 at intervals from top to bottom. The first connecting portion 133 and the second connecting portion 134 are used to connect with the support arm 400 by pins, respectively. By adding the first connecting portion 133 and the second connecting portion 134, a fixed connection between the support arm 400 and the lifting frame 100 can be achieved through the pin connection at two locations, which not only ensures the stability of the connection but also facilitates the connection. Specifically, both the first connecting portion 133 and the second connecting portion 134 can be provided as a hole structure, specifically a hole structure provided on the connecting ear plate 132.

[0033] like Figure 1 and Figure 2 As shown, in one embodiment of this utility model, the lifting frame 100 is provided with a platform 160 and a climbing frame 170 near the connecting seat 130. The addition of the platform 160 facilitates the operator to stand on it to assemble and disassemble the support arm 400 and the connecting seat 130, while the addition of the climbing frame 170 facilitates the operator to climb on the lifting frame 100. Specifically, the platform 160 and the climbing frame 170 are both located on the same side of the connecting seat 130.

[0034] In one embodiment of this utility model, the second lifting part 150 is located at the end of the lifting frame 100 away from the connecting seat 130. Therefore, when the second lifting part 150 and the third lifting part 410 are used together for lifting, the lifting span of the two lifting ropes is maximized, thereby improving the stability of the lifting.

[0035] In one embodiment of this utility model, the fixed counterweight 200 is made of concrete, which has advantages such as low cost and simple manufacturing. Specifically, the fixed counterweight 200 is preferably made of reinforced concrete and can be shaped as a cuboid or cube. In addition, the fixed counterweight 200 is designed to be detachably connected to the lifting frame 100 so that different specifications of support arms 400 can be matched by replacing fixed counterweights 200 of different weights.

[0036] Furthermore, the support arm 400 has an upper mounting rod 420 and a lower mounting rod 430 spaced apart from top to bottom. The upper mounting rod 420 and the lower mounting rod 430 are connected by a web member. The first ends of the upper mounting rod 420 and the lower mounting rod 430 are respectively provided with a first mounting portion 440 and a second mounting portion 450 that are detachably connected to the tower body 500. A third lifting portion 410 is provided on the upper side of the upper mounting rod 420 near the first mounting portion 440. A stirrup 431 for stable placement extends downwards from the lower mounting rod 430. Simultaneously, the support arm lifting device provided by this utility model can correspondingly form a support arm installation method, which includes: In step S100, the connecting seat 130 of the lifting frame 100 is connected to the support arm 400 to form a lifting assembly.

[0037] Specifically, such as Figure 5 As shown, the support arm 400 can be placed on the ground via the stirrups 431 on the lower rod 430. Since the triangular truss 110, the square truss 120 and the fixed counterweight 200 can be detachably connected, the lifting frame 100 and the fixed counterweight 200 can be assembled first, so that the center of gravity of the lifting device is located between the first lifting part 140 and the second lifting part 150. Then, the first connecting part 133 and the second connecting part 134 on the connecting seat 130 are respectively connected to the support arm 400 via pins, so that the upper rod 420 of the support arm 400 and the upper chord 115 in the lifting frame 100 are located at the same width position of the triangular truss 110 and are both horizontally set. At this time, the center of gravity of the entire lifting assembly will be biased towards the side of the support arm 400 away from the tower body 500.

[0038] In step S200, the second lifting rope 302 and the third lifting rope 303 on the main crane 300 are connected to the lifting frame 100 and the support arm 400 respectively.

[0039] Understandably, the lifting assembly can be lifted using the second lifting rope 302 and the third lifting rope 303. The specific choice of whether the second lifting rope 303 is connected to the first lifting section 140 or the second lifting section 150 depends on the connection position of the third lifting rope 303 to the support arm 400.

[0040] In step S300, the tower crane is controlled to drive the main crane 300 to lift the hoisting assembly until the support arm 400 contacts the tower body 500.

[0041] Furthermore, the support boom 400 can be lifted to the corresponding installation height using the tower crane's main hoist 300, and then the tower crane's boom can be controlled to continue luffing until the support boom 400 is successfully connected to the tower body 400.

[0042] In step S400, with the support arm 400 and the tower body 500 fixedly connected, the connection between the third lifting rope 303 and the support arm 400, as well as the connection between the lifting frame 100 and the support arm 400, are removed.

[0043] In step S500, the tower crane is controlled to drive the main hoist 300 to lower the lifting device by connecting the first lifting rope 301 and the second lifting rope 302 to the first lifting part 140 and the second lifting part 150 respectively.

[0044] When using the above-described support arm installation method, balanced lifting of the hoisting assembly can be achieved through the second lifting rope 302 and the third lifting rope 303. Even with minimum amplitude limitations on the luffing jib tower crane, the increased length between the main crane 300 and the support arm 400's installation ends on the tower body 500 allows the main crane 300 to directly hoist the support arm 400 to contact the tower body 500 in one go, eliminating the need for other hoisting devices. This reduces installation costs, improves efficiency, and enhances product competitiveness. Furthermore, after the support arm 400 is fixed to the tower body 500, the fixed counterweight 200 is designed to position the center of gravity of the lifting device between the first lifting section 140 and the second lifting section 150. Therefore, after disconnecting the support arm 400 from the lifting device frame 400, the lifting device can still be lowered using the first lifting rope 301 and the second lifting rope 302.

[0045] Specifically, step S200, connecting the second lifting rope 302 and the third lifting rope 303 on the tower crane main hoist 300 to the lifting frame 100 and the support boom 400 respectively, includes: The first lifting rope 301 and the third lifting rope 303 are placed on the first side of the tower crane main hoist 300, and the second lifting rope 302 is placed on the second side of the tower crane main hoist 300. The first lifting rope 301, the second lifting rope 302 and the third lifting rope 303 are respectively connected to the first hoisting part 140, the second hoisting part 150 and the third hoisting part 410. The lengths of the second lifting rope 302 and the third lifting rope 303 are set to be taut when the hoisting combination is used for lifting, and the length of the first lifting rope 301 is set to be slack when the hoisting combination is used for lifting.

[0046] Understandably, the first and second sides of the tower crane main hoist 300 are equipped with different hoisting hooks. The first hoisting rope 301 and the third hoisting rope 303 are placed on the hoisting hook on the first side, and the second hoisting rope 302 is placed on the hoisting hook on the second side. The first hoisting rope 301 is connected to the first hoisting part 140 before the hoisting assembly is lifted, which can save the subsequent connection work at high altitude and ensure the safety of operation.

[0047] More specifically, step S400, with the support arm 400 fixedly connected to the tower body 500, involves dismantling the connection between the third lifting rope 303 and the support arm 400, as well as the connection between the lifting frame 100 and the support arm 400, including: The support arm 400 is fixedly connected to the tower body 500; Disconnect the third lifting rope 303 from the support arm 400, and control the tower crane to drive the main crane 300 to tighten the first lifting rope 301 and the second lifting rope 302; Disconnect the connection between the lifting frame 100 and the support arm 400.

[0048] Specifically, safety can be ensured by maintaining the tension of the first lifting rope 301 and the second lifting rope 302 before dismantling the connection between the lifting frame 100 and the support boom 400. More specifically, after the support boom 400 is fixed to the tower body 500, the connection between the third lifting rope 303 and the tower crane main hoist 300 is removed, and the third lifting rope 303 is connected to the first lifting rope 301. At this time, the tower crane is controlled to slowly raise the tower crane main hoist 300 until the first lifting rope 301 and the second lifting rope 302 are tensioned to check whether the support boom 400 is securely installed. After the support boom 400 is securely installed, the tower crane is controlled to move the tower crane main hoist 300 downward a certain distance for unloading. Under safe conditions, the connection between the third lifting rope 303 and the support boom 400 is removed, and the shackle at the lower end of the third lifting rope 303 is fastened to the first lifting rope 301 for easy retrieval later. Then, continue to control the tower crane to drive the main crane 300 to tighten the first lifting rope 301 and the second lifting rope 302. After ensuring safety, stand on the platform 160 to remove the connection between the lifting frame 100 and the support arm 400.

[0049] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0052] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A spreader device for a support arm, characterized in that include: The lifting frame (100) has a connecting seat (130) at one end. The connecting seat (130) is used to detachably connect to the end of the support arm (400) away from the tower body (500) to form a lifting assembly. The upper side of the lifting frame (100) is provided with a first lifting part (140) and a second lifting part (150) that can be connected to the lifting rope on the main crane (300) of the tower crane respectively. The connecting seat (130), the first lifting part (140) and the second lifting part (150) are arranged at intervals along the length of the lifting frame (100). A fixed counterweight (200) is provided at one end of the lifting frame (100) away from the connecting seat (130). The fixed counterweight (200) is configured to enable the center of gravity of the lifting device to be located between the first lifting part (140) and the second lifting part (150).

2. The spreader device for a support arm according to claim 1, characterized in that The lifting frame (100) includes a triangular truss (110), which has an upper chord (115) and two lower chords (112). The two lower chords (112) are arranged at intervals relative to each other on the lower side of the upper chord (115). The upper chord (115) is located between the two lower chords (112) and connected to the lower chords (112) through a support rod. The connecting seat (130) is located at one end of the upper chord (115). The first lifting part (140) and the second lifting part (150) are arranged at intervals on the upper side of the upper chord (115). The fixed counterweight (200) is located on the lower side of the triangular truss (110).

3. The spreader device for a support arm according to claim 2, characterized in that The support rod includes a first end rod (117), one end of the triangular truss (110) is provided with the first end rod (117) between the upper chord (115) and the lower chord (112), and a second end rod (118) is provided between the two lower chords (112) to enclose and form a triangular frame.

4. The spreader device for a support arm according to claim 2, characterized by The upper chord (115) is connected to the support rod on its lower side, which is provided corresponding to the first hoisting part (140) and / or the second hoisting part (150).

5. The spreader device for a support arm according to claim 1, characterized by The connecting seat (130) includes a mounting base plate (131) and two connecting lugs (132). The mounting base plate (131) is located at one end of the lifting frame (100). The two connecting lugs (132) are arranged at intervals on the side of the mounting base plate (131) away from the lifting frame (100). The gap between the two connecting lugs (132) is used for the support arm (400) to be inserted and connected.

6. The spreader device for a support arm according to claim 2, characterized by The lifting frame (100) also includes a square truss (120) located on the lower side of the triangular truss (110), and the fixed counterweight (200) is located on the bottom frame (111) of the triangular truss (110) and / or the square truss (120).

7. The spreader device for a support arm according to any one of claims 1 to 6, characterized in that, The connecting seat (130) is provided with a first connecting part (133) and a second connecting part (134) in a top-to-bottom direction, and the first connecting part (133) and the second connecting part (134) are used to connect to the pin of the support arm (400) respectively.

8. The spreader device for a support arm according to any one of claims 1 to 6, characterized in that, The lifting frame (100) is provided with a platform (160) and a climbing frame (170) near the connecting seat (130).

9. The spreader device according to any one of claims 1 to 6, characterized in that The second lifting part (150) is located at the end of the lifting frame (100) away from the connecting seat (130).

10. The spreader device for a support arm according to any one of claims 1 to 6, characterized in that, The fixed counterweight (200) is made of concrete and is designed to be detachably connected to the lifting frame (100).

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