CN205367538U - Swing crane and A cabinet frame thereof - Google Patents

Abstract

The utility model discloses a swing crane's A cabinet frame, including preceding strut, back strut and main loose pulley assembly, preceding strut top and main loose pulley assembly fixed connection, back strut top is articulated with main loose pulley assembly, characterized by, still including supplementary loose pulley assembly, supplementary loose pulley assembly sets up the tip at main loose pulley assembly, just supplementary loose pulley assembly's pulley axis parallel lies in on main loose pulley assembly's the pulley spindle line just, be equipped with the cat ladder on the preceding strut. The utility model also discloses a swing crane, adopts foretell A cabinet frame. The utility model provides a swing crane and A cabinet frame thereof is equipped with supplementary loose pulley assembly simultaneously through leading in the preceding strut of A cabinet frame with the cat ladder on main loose pulley assembly, can realize that the current cat ladder of operating personnel is convenient, installation jib loading boom cable convenient and fast, and then realizes shortening swing crane's installation and dismantlement cycle and the cost that reduces its installation with dismantle.

Description

A boom-type crane and its A-frame

technical field

The utility model relates to an A-frame used for a boom-type crane, and also relates to a boom-type crane provided with the A-frame, which belongs to the technical field of crane machinery.

Background technique

The A-frame is an important part of the boom crane. It is installed on the balance arm of the crane through a pin connection, connected with the boom through the boom cable and rod, and bears the self-weight of the boom and its upper parts. As well as hoisting, wind load and other loads, bending moment, tensile pressure and shear force are generated, and the stress situation is more complicated.

The A-frame in the tower top structure system of the existing boom crane is shown in Figure 1, and generally consists of a front brace 1, a rear brace 2 and a main pulley assembly 4, and the top of the front brace 1 is connected to the main pulley assembly 4. Fixed connection, close to the side of the boom; the top of the rear support 2 is hinged with the main pulley assembly 4, connected with the balance arm, and perpendicular to the balance arm, close to the side of the balance weight; the rear support 2 is provided with a ladder 3, and the rear The ear plate is welded on the support frame 2, and the fixed support of the ladder 3 is connected with the ear plate with two bearing pins and fixed on the rear support frame 2. It can be seen from this that the ladder of the A-frame is a 90-degree ladder, which makes it difficult for personnel to pass through, is not conducive to the installation and disassembly of the crane by personnel, and lacks humanized design considerations.

When installing and dismounting the boom of the boom crane, one truck crane is required to support the boom, and the other truck crane is specially installed and removed for the boom cable. This process requires at least two truck cranes to cooperate with each other, resulting in an increase in the cost of installing and dismantling the jib crane. Not only is the process cumbersome, but it is also very unsafe for operators.

For the above-mentioned type of A-frame, the ladder is arranged vertically on the rear bracket, and the top platform is only equipped with a pulley assembly and lacks auxiliary installation and disassembly devices. When installing and dismounting the boom, the installation and disassembly of the jib crane will take a long time. The number of truck cranes required to be installed and dismantled is large and the cost is high. The purpose of this utility model is to provide a new type of A-frame of the boom crane, which is convenient for the operator to install and disassemble the crane, shortens the installation and disassembly cycle of the boom crane, and reduces the installation and disassembly of the boom crane. the cost of.

Utility model content

The purpose of the utility model is to overcome the deficiencies in the prior art, provide an A-frame for a boom crane, and solve the technical problem of long period and high cost of installing and disassembling the boom cable in the prior art.

In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is: an A-frame for a boom crane, including a front brace, a rear brace and a main pulley assembly, and the top of the front brace and the main pulley assembly Fixedly connected, the top of the rear bracket is hinged with the main pulley assembly; it is characterized in that it also includes an auxiliary pulley assembly, the auxiliary pulley assembly is arranged at the end of the main pulley assembly, and the pulley axis of the auxiliary pulley assembly is parallel to the main pulley block Above the axis of the pulley of the piece; a ladder is provided on the front support.

Further, there are two auxiliary pulley assemblies, which are symmetrically arranged at both axial ends of the main pulley assembly.

Further, the main pulley assembly includes two vertical plates, a pulley block and a rope retaining rod, the pulley block is arranged between the opposite vertical plates, and the rope retaining rod is fixed above the opposite vertical plate for blocking the pulley block Jumping on the wire rope.

Further, the auxiliary pulley assembly includes auxiliary vertical board 1, auxiliary vertical board 2 and auxiliary pulleys, the two auxiliary vertical boards are relatively arranged on both sides of the vertical board of the main pulley assembly, and the auxiliary vertical board 1 is located on the outside of the vertical board ; The auxiliary pulley is located between the two auxiliary vertical boards.

Further, the first auxiliary vertical plate includes a support and a connecting piece, and the connecting piece is provided with a through hole for the rope retaining rod of the main pulley assembly to pass through.

Further, the support and the connecting piece are integrally made.

Further, the auxiliary vertical plate one is made integrally with the vertical plate.

The utility model also provides a boom-type crane, which includes a balance arm, an A-frame and a lifting arm. The cable is connected to the A-frame, which is characterized in that the A-frame is the aforementioned A-frame for the boom crane.

Compared with the prior art, the beneficial effect achieved by the utility model is that the boom crane and its A-frame provided by the utility model place the ladder in front of the front bracket of the A-frame, and at the same time, the main pulley assembly There is an auxiliary pulley assembly on the top of the tower. With the help of such a tower top structure system, it is convenient for people to pass through the ladder, and it is convenient and quick to install the boom cable, thereby shortening the installation and disassembly cycle of the boom crane and reducing its installation and disassembly. cost.

Description of drawings

Fig. 1 is the structural representation of A frame in the prior art;

Fig. 2 is the structural representation of the utility model A frame;

Fig. 3 is a side view structural schematic diagram of the enlarged auxiliary pulley assembly at B of the utility model;

Fig. 4 is a front structural diagram of the enlarged auxiliary pulley assembly at B of the utility model.

In the figure: 1. Front support frame; 2. Rear support frame; 3. Ladder; 4. Main pulley assembly; 4-1, vertical board; 4-2 pulley block; ; 5-1, auxiliary vertical board one; 5-1-1, bearing; 5-1-2, connecting piece; 5-2, auxiliary vertical board two; 5-3 auxiliary pulley.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described. The following examples are only used to illustrate the technical solution of the utility model more clearly, but not to limit the protection scope of the utility model.

As shown in Figures 2 to 4, the utility model provides an A-frame for a boom crane, including a front support frame 1, a rear support frame 2 and a main pulley assembly 4, and the top end of the front support frame 1 is connected to the main pulley assembly. The pulley assembly 4 is fixedly connected, and the top of the rear bracket 2 is hinged with the main pulley assembly 4; it is characterized in that it also includes an auxiliary pulley assembly 5, and the auxiliary pulley assembly 5 is arranged on the end of the main pulley assembly 4, and the auxiliary pulley assembly The pulley axis of the part 5 is located above the pulley axis of the main pulley assembly 4 in parallel; the front support frame 1 is provided with a ladder 3 .

Preferably, for the convenience of operation and stability, referring to FIG. 4 , there are two auxiliary pulley assemblies 5 , which are symmetrically arranged at both ends of the main pulley assembly 4 in the axial direction. The main pulley assembly 4 comprises two vertical plates 4-1, pulley block 4-2 and rope retaining bar 4-3, and described pulley block 4-2 is located between the vertical plates 4-1 that are arranged oppositely, and the rope retaining bar 4-3 It is fixedly arranged above the vertical plate 4-1 that is arranged relatively, and is used to prevent the wire rope on the pulley block 4-2 from jumping. Described auxiliary pulley assembly 5 comprises auxiliary vertical plate one 5-1, auxiliary vertical plate two 5-2 and auxiliary pulley 5-3, and two described auxiliary vertical plates are relatively arranged on the vertical plate 4-1 both sides of main pulley assembly, And the auxiliary vertical board 1 5-1 is located at the outside of the vertical board 4-1; the auxiliary pulley 5-3 is arranged between the two auxiliary vertical boards.

In a preferred embodiment of the present utility model, as shown in Figure 3, the auxiliary vertical plate 5-1 includes a support 5-1-1 and a connecting piece 5-1-2, and the connecting piece 5-1-2 is A through hole is provided for the rope retaining rod 4-3 of the main pulley assembly 4 to pass through. Preferably, the support 5-1-1 and the connecting piece 5-1-2 are integrated, and the auxiliary vertical plate 5-1 is integrated with the vertical plate 4-1, which can increase the strength of the connecting piece 5-1-2, The fixed rope-stopping lever 4-3 and the main pulley assembly 4 are more firm, and the end of the through-hole of the rope-stopping lever 4-3 stretching out the connecting piece 5-1-2 can be limited by a cotter pin to prevent the rope from being blocked. Rod 4-3 escapes from the through hole of connecting piece 5-1-2.

The utility model also provides a boom-type crane, which includes a balance arm, an A-frame and a lifting arm. The stay cables are connected to the A-frame, which is the aforementioned A-frame for the boom crane.

The boom crane and its A-frame provided by the utility model place the ladder 3 in front of the front bracket 1 of the A-frame, and at the same time, an auxiliary pulley assembly 5 is provided on the main pulley assembly 4. With the help of such a tower top The structural system realizes the convenience of personnel passing and climbing ladders, and the convenient and quick installation of boom cables, thereby shortening the installation and disassembly cycle of the boom crane and reducing its installation and disassembly costs.

The beneficial effect of the A-frame of the utility model will be described below in conjunction with the actual installation process of the boom cable. First, an auxiliary steel wire rope with a smaller diameter is used as an installation tool, and one end of the auxiliary steel cable is fastened to the boom cable, and then the operation Personnel ascend to the top of the tower through the ladder 3 provided on the front support frame 1, pass the auxiliary wire rope through the auxiliary pulley 5-3 of the auxiliary pulley assembly 5, and then wind the other end on the luffing mechanism of the crane. The mechanism can install the other end of the boom stay cable to the main pulley assembly 4, thereby realizing fast installation of the boom stay cable. When installing the jib of a crane in the prior art, one truck crane is required to lift the boom, and another truck crane is required to install the jib cable, but after using the A-frame of the utility model, only one truck crane is needed. The truck crane then lifts the boom, and installs the boom cable with the help of the aforementioned method of installing the boom cable with the help of the auxiliary pulley assembly, so as to realize the rapid installation of the boom, especially when the space in the field construction site is tight and it is impossible to find a suitable one. When another truck crane is placed in the place, when the external conditions are open and multiple truck cranes are allowed to be used, it is possible to flexibly choose whether to use the auxiliary pulley assembly according to actual needs. The steps of the method for disassembling the jib cables by using the A-frame of the present invention are opposite to those described above, and will not be repeated here.

The above description is only the preferred embodiment of the utility model, and it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the utility model, some improvements and deformations can also be made. And deformation should also be regarded as the protection scope of the present utility model.

Claims (8)

1. An A-frame for a boom crane, comprising a front brace, a rear brace and a main pulley assembly, the top of the front brace is fixedly connected to the main pulley assembly, and the top of the rear brace is hinged to the main pulley assembly; The feature is that it also includes an auxiliary pulley assembly, the auxiliary pulley assembly is arranged at the end of the main pulley assembly, and the pulley axis of the auxiliary pulley assembly is parallel to and above the pulley axis of the main pulley assembly; a climbing ladder is provided on the front support. 2 . The A-frame for a boom crane according to claim 1 , wherein there are two auxiliary pulley assemblies, which are symmetrically arranged at both ends of the main pulley assembly in the axial direction. 3 . 3. The A-frame for a boom crane according to claim 2, wherein the main pulley assembly includes two vertical plates, a pulley block and a rope retaining rod, and the pulley block is arranged on an opposite vertical Between the boards, the rope retaining rod is fixedly arranged above the opposite vertical boards, and is used to stop the jumping of the wire ropes on the pulley block. 4. The A-frame for a boom crane according to claim 3, wherein the auxiliary pulley assembly includes auxiliary vertical board 1, auxiliary vertical board 2 and auxiliary pulleys, and the two auxiliary vertical boards are opposite to each other. It is arranged on both sides of the vertical board of the main pulley assembly, and the auxiliary vertical board is located on the outside of the vertical board; the auxiliary pulley is arranged between the two auxiliary vertical boards. 5. The A-frame for a boom crane according to claim 4, wherein the auxiliary vertical plate comprises a support and a connecting piece, and the connecting piece is provided with a retaining rope for the main pulley assembly A through hole through which the rod passes. 6 . The A-frame for a boom crane according to claim 5 , wherein the support and the connecting piece are integrally made. 7 . 7 . The A-frame for a boom crane according to claim 5 , wherein the auxiliary vertical plate is made integrally with the vertical plate. 7 . 8. A boom-type crane, including a balance arm, an A-frame and a lifting arm, the A-frame is fixed on the balance arm, the boom is hinged to the balance arm, and the top of the A-frame is connected to the A A frame, characterized in that the A-frame is the A-frame for a boom crane according to any one of claims 1-7.