Upper and lower split type balance arm structure

Abstract

The utility model discloses an up-down split type balance arm structure, and belongs to the technical field of balance arm structures of tower cranes. According to the technical scheme, the balance arm comprises an upper piece structure and a lower piece structure, wherein the upper piece structure comprises two upper piece main chord members and horizontal straight web members which form an upper plane of the balance arm, and web member assemblies arranged around the bottoms of the upper piece main chord members; the upper main chord member comprises an upper main chord member I and an upper main chord member II; the horizontal straight web member is positioned between the upper main chord member I and the upper main chord member II; the web member assembly is composed of two web member square tubes, a flange plate and a gusset plate. The utility model has the beneficial effects that the original N-shaped web member structure is adjusted into the X-shaped structure, and the supporting square tube is welded between the web members on the two sides for reinforcement, so that the structural strength of the arm section is ensured; the upper arm section and the lower arm section are connected through the bolts and the positioning pins on the flange plates, the upper arm section and the lower arm section are firstly positioned through the center pin shafts of the flange plates during installation, installation precision is guaranteed, and installation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tower crane balance arm structures, in particular to an upper and lower split balance arm structure. Background Art

[0002] The market demand for large flat-top tower cranes is gradually increasing, and the news that a large number of tower cranes are exported overseas is also promoting the development of Chinese tower cranes in a better direction. Tower cranes will inevitably move in the direction of flat top, large size, and intelligence. The development of large flat-top tower cranes will inevitably make the combination of balance arms more and more diverse, while meeting the use requirements, saving materials as much as possible, and facilitating installation. Therefore, there are still parts that need to be improved in the design process of the balance arm of the flat-top tower crane.

[0003] The main function of the balance arm is to support the counterweight and provide reverse torque for the lifting arm, so as to ensure the balance of the machine body during the lifting process. In addition, the balance arm is also used to place components such as the lifting mechanism and the electrical control box. It is one of the important tower crane accessories.

[0004] Large-tonnage flat-top tower cranes generally use rectangular cross-section truss counter-arms. The advantages and disadvantages of rectangular cross-section truss counter-arms are between those of plane frame counter-arms and triangular cross-section truss counter-arms, but the rectangular cross-section counter-arms combine the advantages of both. Their structural components are compact, their windward area is large, and their wind load per unit area is small, making them suitable for areas with strong winds. However, the rectangular cross-section truss counter-arm is more stable than the plane frame structure, and has relatively low performance requirements for the main beam of the counter-arm. There are multiple planes inside the counter-arm, so there is a lot of space for storing the counter-arm, lifting mechanism, etc. At the same time, the truss structure makes the counter-arm itself have a protective function, and the walkway is generally arranged inside the counter-arm structure to save materials.

[0005] At present, as the tonnage of tower cranes increases, the volume of the balance arm will also increase, which can easily cause large welding deformation, resulting in installation difficulties, and there are problems such as large transportation tonnage, inability to transport, and inconvenience for customers to store. This is specifically reflected in the following aspects:

[0006] 1. Large welding deformation

[0007] The traditional integrally welded rectangular cross-section truss balance arm has high weight and large volume, and the processing tolerance is not easy to guarantee. The structure size is large, the welding process is complex, and the welding deformation is difficult to control. It is easy to cause the balance arm to bend and twist, which affects the installation accuracy and performance of the balance arm. In severe cases, it may even cause the structure of the balance arm to fail, and the processing cost is high.

[0008] 2. Difficult to install

[0009] The traditional integrally welded balance arm is bulky and heavy, requiring a large crane and other auxiliary equipment for installation. The construction is difficult, time-consuming and labor-intensive, especially when installed in high-rise buildings or narrow spaces.

[0010] 3. Large transport tonnage

[0011] Traditional integrally welded balance arms are bulky, heavy, and require large transport tonnage. They require large transport vehicles and special transport equipment, and have high requirements for transport vehicle space and loading layout. They have high transportation costs, low efficiency, and put pressure on road traffic.

[0012] 4. Inconvenience for customers to store

[0013] Traditional integrally welded balance arms are bulky, heavy, and take up a lot of space, making them difficult for customers to store. They require a larger site and specialized storage facilities, increasing customers’ storage costs and management difficulties.

[0014] In summary, the main problems of the existing tower crane balance arm technology include large welding deformation, difficult installation, large transportation tonnage, inconvenient customer storage, etc. These problems limit the transportation, installation and storage of large tonnage tower cranes, and also affect the construction efficiency and overall performance of tower cranes. How to solve the above technical problems is the subject faced by this utility model. Utility Model Content

[0015] In view of the situation that the increased volume of the balance arm makes it inconvenient to transport, the utility model provides an upper and lower split balance arm structure, which replaces the overall welding by splicing the upper and lower split parts, thereby meeting the transportation, installation, storage and other conditions of large-tonnage tower cranes.

[0016] The utility model is realized by the following measures: an upper and lower split type balancing arm structure, comprising an upper plate structure and a lower plate structure, wherein the upper plate structure comprises two upper plate main chord rods and a horizontal straight web rod constituting the upper plane of the balancing arm, and a web rod assembly arranged around the bottom of the upper plate main chord rod;

[0017] The upper main chord comprises an upper main chord 1 and an upper main chord 2, and the horizontal straight web member is located between the upper main chord 1 and the upper main chord 2;

[0018] The web member assembly is composed of two web member square tubes, a flange plate and a node plate;

[0019] The lower main chord comprises a lower main chord 1 and a lower main chord 2, and the horizontal straight web member is located between the lower main chord 1 and the lower main chord 2;

[0020] The web member assembly is composed of two web member square tubes, a flange plate and a node plate;

[0021] The upper structure is tilted downward, the lower structure is arranged horizontally, and the side surface presents a trapezoidal cross section, the high side is connected to the rotating tower body, and the low side is connected to other arm sections of the balance arm.

[0022] Each flange plate is provided with a central hole for installing a positioning pin shaft, and is surrounded by 8 bolt installation holes for installing fixing bolts.

[0023] The web member assembly is triangular in shape as a whole, and the web member square tubes are divided into tension web members and compression web members. The node plates are welded at the intersection of each group of web members to connect the support frame.

[0024] The flange plate is arranged at the bottom of the web intersection to connect the upper sheet structure and the lower sheet structure.

[0025] Connecting square tubes are arranged between the square tubes of the web members located on both sides of the bottom of the upper main chord rod 1 and the upper main chord rod 2 for reinforcement.

[0026] The lower plate structure comprises two lower plate main chords constituting the lower plane of the balance arm, a horizontal straight web member and a web member assembly arranged around the top of the lower plate main chord.

[0027] Each flange plate of the lower sheet structure is provided with a central hole for installing a positioning pin shaft, and 8 bolt installation holes are provided around it for installing fixing bolts.

[0028] The web member assembly of the lower plate structure is triangular in shape as a whole, and the web member square tubes are divided into tension web members and compression web members. The node plate is welded at the intersection of each group of web members to connect the support frame.

[0029] The flange plate is arranged at the bottom of the intersection of the web bars of the lower sheet structure to connect the upper sheet structure and the lower sheet structure.

[0030] Connecting square tubes are arranged between the square tubes of the web members located on both sides of the top of the first main chord of the lower sheet and the second main chord of the lower sheet for reinforcement.

[0031] The overall structures of the upper and lower structures are similar. Taking the upper structure as an example, the upper plane of the balance arm is first welded by upper main chord bar 1, upper main chord bar 2 and horizontal straight web bar; then the web bar assembly is welded around the welded upper main chord bar. The web bar assembly is composed of two web bar square tubes, flange plates and node plates. Each flange plate is provided with a center hole for installing a positioning pin, and 8 bolt mounting holes are provided around it for installing fixing bolts. The web bar assembly is triangular in shape as a whole. The web bar square tubes are divided into tension web bars and compression web bars. The node plate is welded at the intersection of each group of web bars to serve as a connecting support frame. This shape can increase the stability of the structure and is beneficial to stress distribution. Connecting square tubes are set between the web bar square tubes on both sides of the bottom of the upper main chord bar 1 and the upper main chord bar 2 for reinforcement to enhance the structural strength and stability.

[0032] The lower plate structure is similar to the upper plate structure, and is also composed of two lower plate main chords that form the lower plane of the balance arm, a horizontal straight web, and a web assembly arranged around the top of the lower plate main chord. First, the lower plate structure is welded together by the lower plate main chord 1, the lower plate main chord 2, and the horizontal straight web, and then the pre-assembled web assembly is welded around the chord plane. The web assembly of the lower plate structure is also composed of two web square tubes, flange plates, and node plates. The structure is triangular, and a positioning pin is installed in the center of the flange plate to dock with the center of the flange plate of the upper plate structure. The square tubes are also welded between the web groups on both sides to enhance the structural strength and stability.

[0033] The upper and lower structures are first positioned and fixed through the center positioning pin of the flange to ensure installation accuracy and improve installation efficiency; then they are connected and fixed with high-strength fixing bolts. After the upper and lower structures are connected, the overall belly rod of the balance arm presents an X shape.

[0034] Compared with the prior art, the beneficial effects of the utility model are as follows: the scheme provides an upper and lower split balancing arm structure, based on the increased volume of the balancing arm of super-large tower cranes, by dividing the traditional integrally welded rectangular cross-section truss balancing arm into a split balancing arm spliced ​​upper and lower, the original N-shaped web structure is adjusted to an X-shaped structure, and supporting square tubes are welded between the webs on both sides for reinforcement to ensure the structural strength of the arm section; the upper and lower arm sections are connected by bolts and locating pins on the flange plate, and the upper and lower pieces are first positioned by the center pin shaft of the flange plate during installation to ensure installation accuracy and improve installation efficiency; and then they are fixed with high-strength bolts, which solves the problems of large volume, high processing difficulty, and difficulty in transportation and storage of the balancing arm of super-large tonnage tower cranes while ensuring overall strength and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0036] Figure 1 It is a stereoscopic diagram and an exploded diagram of the traditional balance arm structure.

[0037] Figure 2 It is a side view of an embodiment of the utility model.

[0038] Figure 3 It is a side view of the upper sheet structure of an embodiment of the utility model.

[0039] Figure 4 It is a side view of the lower sheet structure of an embodiment of the utility model.

[0040] Figure 5It is a three-dimensional diagram of an embodiment of the utility model.

[0041] Figure 6 It is a three-dimensional diagram of the upper sheet structure of an embodiment of the utility model.

[0042] Figure 7 It is a three-dimensional diagram of the lower piece structure of an embodiment of the utility model.

[0043] Figure 8 This is a diagram of the main chord of the upper piece of the upper piece structure of an embodiment of the utility model.

[0044] Fig. 9 This is a diagram of the web rod assembly of the upper plate structure of an embodiment of the utility model.

[0045] Fig.10 This is a diagram of the web rod assembly of the lower plate structure of an embodiment of the utility model.

[0046] Fig.11 This is a diagram of the main chord of the lower piece of the lower piece structure of an embodiment of the utility model.

[0047] Fig.12 It is a schematic structural diagram of a positioning pin shaft according to an embodiment of the utility model.

[0048] Fig.13 It is a schematic structural diagram of a fixing bolt according to an embodiment of the utility model.

[0049] Among them, the reference numerals are: 10, upper plate structure; 20, lower plate structure; 3, horizontal straight web member; 1, upper plate main chord rod 1; 2, upper plate main chord rod 2; 4, web member square tube; 5, flange plate; 6, node plate; 21, lower plate main chord rod 1; 22, lower plate main chord rod 2; 8, positioning pin shaft; 9, fixing bolt; 7, connecting square tube;

[0050] 31. Traditional balance arm upper piece structure; 32. Traditional balance arm lower piece structure; 33. Traditional balance arm belly rod. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0052] See also Figures 1 to 5 The utility model provides an upper and lower split balancing arm structure, comprising an upper structure 10 and a lower structure 20, wherein the upper structure 10 comprises two upper main chord rods and a horizontal straight web rod 3 constituting an upper plane of the balancing arm, and a web rod assembly arranged around the bottom of the upper main chord rod;

[0053] The upper main chord includes an upper main chord 1 and an upper main chord 2, and a horizontal straight web member 3 is located between the upper main chord 1 and the upper main chord 2;

[0054] The web member assembly is composed of two web member square tubes 4, a flange plate 5 and a node plate 6;

[0055] The lower main chord includes a lower main chord 1 21 and a lower main chord 2 22, and the horizontal straight web member 3 is located between the lower main chord 1 21 and the lower main chord 2 22;

[0056] The web member assembly is composed of two web member square tubes 4, a flange plate 5 and a node plate 6;

[0057] The upper structure 10 is tilted downward, and the lower structure 20 is arranged horizontally. The side surface presents a trapezoidal cross section, wherein the high side is connected to the rotating tower body, and the low side is connected to other arm sections of the balance arm.

[0058] The web member assembly is triangular in shape as a whole. The web member square tube 4 is divided into a tension web member and a compression web member. A node plate 6 is welded at the intersection of each set of web members to connect the support frame.

[0059] A flange plate 5 is provided at the bottom of the intersection of the web members to connect the upper structure 10 and the lower structure 20 .

[0060] Connecting square tubes 7 are provided between the web square tubes 4 located at both sides of the bottom of the upper main chord bar 1 and the upper main chord bar 2 2 for reinforcement.

[0061] The lower plate structure 20 comprises two lower plate main chords constituting the lower plane of the balance arm, a horizontal straight web member 3 and a web member assembly arranged around the top of the lower plate main chords.

[0062] A flange plate 5 is provided at the bottom of the intersection of the web bars of the lower sheet structure 20 to connect the upper sheet structure 10 and the lower sheet structure 20 .

[0063] Connecting square tubes 7 are provided between the web member square tubes 4 located on both sides of the top of the lower sheet main chord bar 1 21 and the lower sheet main chord bar 2 22 for reinforcement.

[0064] The traditional rectangular cross-section balance arm structure is as follows Figure 1 As shown. The overall structure is a rectangular box structure, the traditional balance arm upper plate structure 31 and the traditional balance arm lower plate structure 32 are parallel to each other, and the upper and lower plate structure frames are composed of two main chord rods with square tubes welded in the middle, and the upper and lower plates are connected into a whole by welding the traditional balance arm belly rod 33 on the side. It can be seen that the side belly rod is arranged in an N-shaped structure, that is, a diagonal brace rod is welded between two straight braces.

[0065] The upper plate structure 10 and the lower plate structure 20 of this scheme have similar overall structures. Taking the upper plate structure 10 as an example, the upper plane of the balance arm is first welded by the upper plate main chord 1, the upper plate main chord 2 and the horizontal straight web 3; then the web assembly is welded around the welded upper plate main chord, and the web assembly is composed of two web square tubes 4, flange plates 5 and node plates 6. Each flange plate 5 is provided with a central hole for installing a positioning pin 8, and 8 bolt mounting holes are provided around it for installing fixing bolts 9. The web assembly is triangular in shape as a whole. The web square tube 4 is divided into a tension web and a compression web. The node plate 6 is welded at the intersection of each group of webs to serve as a connecting support frame. This shape can increase the stability of the structure and is conducive to stress distribution. A connecting square tube 7 is provided between the web square tubes 4 on both sides of the bottom of the upper plate main chord 1 and the upper plate main chord 2 for reinforcement to enhance the structural strength and stability.

[0066] The lower plate structure is similar to the upper plate structure, and is also composed of two lower plate main chords constituting the lower plane of the balance arm, a horizontal straight web 3, and a web assembly arranged around the top of the lower plate main chord. The lower plate structure 20 is first welded by the lower plate main chord 1 21, the lower plate main chord 2 2 and the horizontal straight web 3, and then the pre-assembled web assembly is welded around the chord plane. The web assembly of the lower plate structure is also composed of two web square tubes 4, a flange plate 5 and a node plate 6. The structure is triangular, and a positioning pin 8 is installed at the center of the flange plate 5 to dock with the center of the flange plate of the upper plate structure. The square tube 7 is also welded between the web groups on both sides to enhance the structural strength and stability.

[0067] The upper structure 10 and the lower structure 20 are first positioned and fixedly connected by the central positioning pin 8 of the flange to ensure installation accuracy and improve installation efficiency; then they are connected and fixed by high-strength fixing bolts 9. After the upper structure 10 and the lower structure 20 are connected, the overall belly rod of the balance arm presents an X shape.

[0068] Different from the rectangular frame structure of the regular cuboid box, the upper and lower pieces of the new balance arm are not arranged horizontally and parallel, but the upper piece structure is tilted downward, the lower piece is arranged horizontally, and the side presents a trapezoidal cross-section, which reduces the production cost to a certain extent. The balance arm is divided into two sections from the middle, namely the upper piece structure 10 and the lower piece structure 20, and the side rib welding form is changed. The ribs on both sides of the upper and lower pieces are triangular structures. The flange plate 5 is welded at the intersection of the ribs to connect the upper piece structure 10 and the lower piece structure 20. After splicing, the rib structure of the balance arm is X-shaped as a whole. In order to enhance the strength, a connecting square tube 7 is set between the rib square tubes 4 on both sides of the bottom of the upper main chord bar 1 and the upper main chord bar 2 2 for reinforcement to ensure the structural strength and stability of the arm section; during installation, the upper piece structure 10 and the lower piece structure 20 are first connected and positioned by the positioning pin 8 in the center of the flange plate 5, and then fixed by the high-strength fixing bolts 9. Example

[0069] On the basis of Example 1, each flange plate 5 is provided with a central hole for installing a positioning pin 8 , and is surrounded by 8 bolt mounting holes for installing fixing bolts 9 .

[0070] This shape can increase structural stability, facilitate stress distribution, and enhance structural strength and stability. Example

[0071] On the basis of Example 1, the web member assembly is triangular in shape as a whole, the web member square tube 4 is divided into tension web members and compression web members, and a node plate 6 is welded at the intersection of each group of web members to connect the support frame.

[0072] The triangular structure has good stability and load-bearing capacity, which can effectively improve the overall strength and rigidity of the balance arm. In addition, a connecting square tube is set between the upper main chord and the lower main chord for reinforcement, which further enhances the load-bearing capacity of the balance arm.

[0073] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An upper and lower split balancing arm structure, characterized in that: It comprises an upper plate structure (10) and a lower plate structure (20), wherein the upper plate structure (10) comprises two upper plate main chords and a horizontal straight web member (3) constituting an upper plane of a balance arm, and a web member assembly arranged around the bottom of the upper plate main chord; The lower plate structure (20) comprises two lower plate main chords constituting the lower plane of the balance arm, a horizontal straight web member (3) and a web member assembly arranged around the top of the lower plate main chord; The upper main chord comprises an upper main chord 1 (1) and an upper main chord 2 (2), and the horizontal straight web member (3) is located between the upper main chord 1 (1) and the upper main chord 2 (2); The web member assembly is composed of two web member square tubes (4), a flange plate (5) and a node plate (6); The lower main chord comprises a lower main chord 1 (21) and a lower main chord 2 (22), and the horizontal straight web member (3) is located between the lower main chord 1 (21) and the lower main chord 2 (22); The upper structure (10) is inclined downward, and the lower structure (20) is arranged horizontally. The side surface presents a trapezoidal cross section, the higher side is connected to the rotating tower body, and the lower side is connected to other arm sections of the balance arm.

2. The upper and lower split balancing arm structure according to claim 1 is characterized in that: Each flange plate (5) is provided with a central hole for mounting a positioning pin (8), and is surrounded by eight bolt mounting holes for mounting fixing bolts (9).

3. The upper and lower split balancing arm structure according to claim 2 is characterized in that: The web member assembly is triangular in shape as a whole, and the web member square tube (4) is divided into tension web members and compression web members. The node plate (6) is welded at the intersection of each group of web members to serve as a connection support frame.

4. The upper and lower split balancing arm structure according to claim 3 is characterized in that: The flange plate (5) is arranged at the bottom of the web bar intersection to connect the upper sheet structure (10) and the lower sheet structure (20).

5. The upper and lower split balancing arm structure according to claim 4 is characterized in that: Connecting square tubes (7) are arranged between the web square tubes (4) located on both sides of the bottom of the upper main chord rod 1 (1) and the upper main chord rod 2 (2) for reinforcement.

6. The upper and lower split balancing arm structure according to claim 5, characterized in that: Each flange plate (5) of the lower sheet structure (20) is provided with a central hole for installing a positioning pin shaft (8), and is surrounded by 8 bolt installation holes for installing fixing bolts (9).

7. The upper and lower split balancing arm structure according to claim 6 is characterized in that: The web member assembly of the lower plate structure (20) is triangular in shape as a whole, and the web member square tube (4) is divided into tension web members and compression web members. The node plate (6) is welded at the intersection of each group of web members to serve as a connecting support frame.

8. The upper and lower split balancing arm structure according to claim 7 is characterized in that: The flange plate (5) is arranged at the bottom of the intersection of the web bars of the lower sheet structure (20) to connect the upper sheet structure (10) and the lower sheet structure (20).

9. The upper and lower split balancing arm structure according to claim 8, characterized in that: Connecting square tubes (7) are provided between the web square tubes (4) located on both sides of the top of the lower main chord rod 1 (21) and the lower main chord rod 2 (22) for reinforcement.

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