A flat-top tower crane jib head

Abstract

The present invention discloses a boom head of a flat-top tower crane, comprising a web, a connecting plate, a main chord square tube, a positioning plate, and a variable-length pulley mounting plate, wherein the web, the connecting plate, and the main chord square tube constitute a boom head frame, four main chord square tubes form a rectangular frame, the lower ends of three webs are fixedly connected to the rectangular frame, and the upper ends are fixedly connected to the connecting plate. The positioning plate is installed at the front end of the rectangular frame, and the variable-length pulley mounting plate is located at the bottom of the rectangular frame and fixedly connected to the rectangular frame. The above structure makes the overall weight of the boom head lighter, the force is optimized, and the installation and disassembly are more convenient.

Description

Technical Field

[0001] The invention relates to the technical field of tower cranes, and in particular to a boom head of a flat-top tower crane. Background Art

[0002] The boom head is an important component of the tower crane's lifting arm. It carries the tower crane's hoisting performance and the realization of the tower crane's variable arm function when the tower crane operates with different arm lengths. The design of the boom head directly affects the installation and disassembly efficiency of the tower crane's variable arm.

[0003] The existing flat-top tower crane boom head structure is heavy, such as Figure 4 As shown, when the arm is changed, the positioning plate pin shaft connection and the connecting bent plate bolt assembly connection are adopted. The connecting bent plate needs to be welded on the arm section that needs to be changed. There are many types of parts. The overall arm head structure adopts an upward assembly form. The square tube specifications are large, the force is uneven, the overall arm head structure size is large, and the weight is heavy, which affects the overall lifting performance and installation efficiency of the tower crane. Summary of the invention

[0004] The object of the present invention is to provide a boom head of a flat-top tower crane to solve the problems of the existing boom head being too large in size, too heavy and inconvenient to install and disassemble.

[0005] To achieve the above-mentioned purpose, the present invention provides a boom head of a flat-top tower crane boom, comprising a web, a connecting plate, a main chord square tube, a positioning plate, and a variable-length pulley mounting plate, wherein the web, the connecting plate, and the main chord square tube constitute a boom head frame, the four main chord square tubes form a rectangular frame, the lower ends of three webs are fixedly connected to the rectangular frame, and the upper ends are fixedly connected to the connecting plate; the positioning plate is installed at the front end of the rectangular frame, and the variable-length pulley mounting plate is located at the bottom of the rectangular frame and fixedly connected to the rectangular frame.

[0006] Furthermore, a stop block is included, which is installed on the rectangular frame and located above the positioning plate.

[0007] Furthermore, it also includes an auxiliary platform, which is installed in the rectangular frame and located on both sides of the variable amplitude pulley mounting plate.

[0008] Furthermore, the positioning plate includes a base plate, a pin barrel, and a sealing plate. The base plate is located on the barrel arm of the pin barrel and is perpendicular to the pin barrel. The front end of the pin barrel is open, and the rear end is sealed by the sealing plate.

[0009] Furthermore, pin connection points are provided on both the connecting plate and the positioning plate.

[0010] The beneficial effects of the present invention are as follows: the arm head structure is composed of a connecting plate, a web and a main chord square tube to form an arm head frame, the weight of the entire frame is reduced, the overall structure becomes smaller, the force structure is optimized, and three connection points are formed by a connecting plate and two positioning plates. These three connection points are directly connected to the arm section and are all connected by pins, which greatly improves the convenience of installation and disassembly and the assembly accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0012] Figure 2 is another three-dimensional structural schematic diagram of the present invention;

[0013] Figure 3 It is a structural schematic diagram of the positioning plate;

[0014] Figure 4 It is a structural schematic diagram of the prior art;

[0015] In the figure, 1-web rod, 2-connecting plate, 3-main chord square tube, 4-positioning plate, 41-base plate, 42-pin cylinder, 43-sealing plate, 5-luffing pulley mounting plate, 6-stop block, 7-auxiliary platform. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0017] like Figure 1-2 As shown, a boom head of a flat-top tower crane boom includes a web 1, a connecting plate 2, a main chord square tube 3, a positioning plate 4, and a variable-length pulley mounting plate 5, wherein the web 1, the connecting plate 2, and the main chord square tube 3 constitute a boom head frame, and four main chord square tubes 3 form a rectangular frame, in which the lower ends of three webs 1 are fixedly connected to the rectangular frame, and the upper ends are fixedly connected to the connecting plate 2. The positioning plate 4 is installed at the front end of the rectangular frame, and the variable-length pulley mounting plate 5 is located at the bottom of the rectangular frame and fixedly connected to the rectangular frame, and is connected and fixed to the main chord square tube 4 through some square tubes. The boom head also includes a stop block 6, which is installed on the rectangular frame and located above the positioning plate 4. The stop block 6 can realize the control of the amplitude limit of the load trolley. Among them, as Figure 3As shown, the positioning plate 4 includes a base plate 41, a pin barrel 42, and a sealing plate 43. The base plate 41 is located on the cylinder arm of the pin barrel 42 and is perpendicular to the pin barrel 42. The front end of the pin barrel 42 is open, and the rear end is blocked by a sealing plate 43. The material of the main chord square tube is a square tube, so the weight of the entire arm head can be effectively reduced. In addition, a part of the pin barrel 42 can extend into the interior of the main chord square tube, which can make the entire arm head structure smaller. The arm head also includes an auxiliary platform 7, which is installed in a rectangular frame and is located on both sides of the variable amplitude pulley mounting plate 5. The auxiliary platform 7 is provided to facilitate the staff to fix the arm head anti-twist device and install the lifting wire rope clamp, thereby improving the overall working efficiency. Pin shaft connection points are provided on the connecting plate 2 and the positioning plate 4, which are convenient for the arm head to dock with the arm section and are easier to install and disassemble.

[0018] from Figure 1 and Figure 4 Compared with the previous model, the new boom head structure has become simpler as a whole, with fewer parts and lighter weight. The connection with the boom section does not require welding of bent plates or bolts, but only pins, which can save time for installation and disassembly.

[0019] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Various changes that can be made within the knowledge scope of technicians in the relevant technical field without departing from the spirit of the present invention are all within the protection scope of the claims of the present invention.

Claims

1. A flat-top tower crane boom head, characterized in that: The invention comprises a web member (1), a connecting plate (2), a main chord square tube (3), a positioning plate (4), and a variable-length pulley mounting plate (5), wherein the web member (1), the connecting plate (2), and the main chord square tube (3) form a boom head frame, and four main chord square tubes (3) form a rectangular frame, the lower ends of three web members (1) are fixedly connected to the rectangular frame, and the upper ends are fixedly connected to the connecting plate (2); the positioning plate (4) is mounted at the front end of the rectangular frame, and the variable-length pulley mounting plate (5) is located at the bottom of the rectangular frame and is fixedly connected to the rectangular frame. ; also includes a stop block (6), the stop block (6) is mounted on the rectangular frame and is located above the positioning plate (4); also includes an auxiliary platform (7), the auxiliary platform (7) is mounted in the rectangular frame and is located on both sides of the variable amplitude pulley mounting plate (5); the positioning plate (4) includes a base plate (41), a pin barrel (42), and a sealing plate (43), the base plate (41) is located on the barrel arm of the pin barrel (42) and is perpendicular to the pin barrel (42), the front end of the pin barrel (42) is open, and the rear end is blocked by the sealing plate (43).

2. The boom head of a flat-top tower crane according to claim 1, characterized in that: The connecting plate (2) and the positioning plate (4) are both provided with pin connection points.

Images