Crane with double rotary tables

Abstract

The utility model discloses a double-turntable crane which comprises a chassis, a slewing bearing is mounted on the chassis, a turntable connecting piece is mounted on the slewing bearing, two turntables are symmetrically arranged on the turntable connecting piece by taking a slewing axis of the slewing bearing as a symmetry axis, and a hoisting mechanism is mounted on each turntable; the rotary table connecting piece comprises a connecting part located in the middle and installed on the slewing bearing, and two installation parts located on the two sides of the connecting part and used for installing a rotary table. The lower surfaces of the two mounting parts are curved surfaces, and the two curved surfaces are sunken towards the upper part of the connecting part; the hoisting mechanism comprises a mast hinged to the rotary table, a counterweight assembly installed on the mast and provided with a counterweight piece, a lifting assembly installed on the rotary table and used for pulling the counterweight piece to move up and down, and a hoisting assembly installed on the rotary table and used for hoisting heavy objects. By arranging the two rotary tables and the two hoisting mechanisms, when a large-load heavy object is hoisted, the two hoisting mechanisms can work synchronously, and the heavy object is hoisted together.

Description

Technical Field

[0001] The utility model belongs to the technical field of cranes, and in particular relates to a double-turntable crane. Background Art

[0002] Crawler crane is a truss boom structure crane with a crawler walking chassis, which can lift heavy objects to a certain height.

[0003] Currently, when lifting heavy objects, if one crane is unable to lift and a larger crane is unavailable, two cranes are used in combination to achieve the desired lift. However, when two cranes are used in combination, there is an inevitable problem of asynchronous operation, which can cause the object to tilt, posing a safety hazard. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a double-turntable crane. By arranging two turntables and two lifting mechanisms, when lifting heavy objects with large loads, the two lifting mechanisms can work synchronously and lift the heavy objects together.

[0005] The utility model provides the following technical solutions:

[0006] A double-turntable crane comprises a chassis, a slewing bearing is mounted on the chassis, a turntable connecting member is mounted on the slewing bearing, two turntables are provided on the turntable connecting member, and a lifting mechanism is mounted on each turntable; the turntable connecting member comprises a symmetrically arranged connecting portion, and two mounting portions located on both sides of the connecting portion for mounting the turntable; the lower surfaces of the two mounting portions are both arranged as curved surfaces, and the two curved surfaces are both recessed toward the upper portion of the connecting portion; the lifting mechanism comprises a mast hinged to the turntable, a counterweight assembly mounted on the mast and having a counterweight, a lifting assembly mounted on the turntable for pulling the counterweight up and down, and a lifting assembly mounted on the turntable for lifting heavy objects.

[0007] Furthermore, the turntable is symmetrically arranged on the turntable connecting member with the rotation axis of the slewing support as the symmetry axis.

[0008] Furthermore, the lifting assembly includes a winch on which the first steel wire rope is wound.

[0009] Furthermore, a support rod inclined toward the counterweight is fixed on the turntable, a first fixed pulley is installed on the top of the support rod, and a lifting ring is provided on the counterweight. The free end of the first steel wire rope passes through the first fixed pulley and the lifting ring in turn and is connected to the mast.

[0010] Furthermore, a mounting hole for mounting the turntable is provided on the mounting portion, and bolt holes for passing bolts are provided on the mounting portion outside the mounting hole.

[0011] Furthermore, the connecting portion is installed in the middle portion above the slewing bearing.

[0012] Furthermore, the lifting assembly includes a lifting winch installed on a turntable and wound with a second steel wire rope, and a main arm hinged to the turntable; a plurality of second fixed pulleys are installed on the main arm, and the free end of the second steel wire rope passes around the plurality of second fixed pulleys and extends to the side of the main arm away from the mast, and a hook is fixed to the free end of the second steel wire rope.

[0013] Furthermore, a pull plate is installed at one end of the main arm away from the turntable, and the other end of the pull plate is installed on the mast.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. By setting up two turntables and two lifting mechanisms, when lifting heavy loads, the two lifting mechanisms can work synchronously and lift the heavy objects together, improving work efficiency and reducing safety hazards.

[0016] 2. By setting the lower surfaces of the two mounting parts as curved surfaces, and both curved surfaces are recessed toward the upper part of the connecting part, such a design enables the turntable connecting part to withstand a greater load. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a double turntable crane in an embodiment of the present utility model.

[0018] Figure 2 This is a schematic diagram of the connection relationship between the turntable, turntable connector, slewing support and chassis in an embodiment of the present utility model.

[0019] Figure 3 It is a structural schematic diagram of the turntable connecting member in an embodiment of the present utility model.

[0020] Figure 4 This is a structural schematic diagram of the mounting holes and bolt holes provided on the mounting portion in an embodiment of the present utility model.

[0021] Marked in the figure are: turntable 1, turntable connecting part 2, connecting part 21, mounting part 22, mounting hole 23, bolt hole 24, slewing bearing 3, chassis 4, main arm 5, mast 6, counterweight 7, lifting assembly 8, first wire rope 9, pull plate 10, second wire rope 11. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention.

[0023] It should be noted that, in the description of the present invention, the directions or positional relationships indicated by the terms "front", "back", "left", "right", "up", "down", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0024] Example 1:

[0025] like Figure 1 and Figure 2 As shown, this embodiment provides a dual-turntable crane, comprising a chassis 4, on which is mounted a slewing bearing 3, a turntable connector 2 mounted on the slewing bearing 3, two turntables 1 symmetrically arranged on the turntable connector 2 with the slewing bearing 3 as the axis of symmetry, each turntable being mounted with a lifting mechanism. The turntable connector 2 comprises a connecting portion 21 located in the middle and mounted on the slewing bearing 3, and two mounting portions 22 located on either side of the connecting portion 21 for mounting the turntable 1. The lower surfaces of the two mounting portions 22 are curved, and both curved surfaces are recessed toward the upper portion of the connecting portion, enabling the turntable connector 2 to withstand a greater load. The lifting mechanism comprises a mast 6 hinged to the turntable 1, a counterweight assembly having a counterweight 7 mounted on the mast 6, a lifting assembly 8 mounted on the turntable 1 for pulling the counterweight 7 up and down, and a lifting assembly mounted on the turntable 1 for lifting heavy objects.

[0026] In this embodiment, the lifting assemblies of the two lifting mechanisms are respectively fixedly connected to the heavy loads that need to be lifted, and the counterweight 7 is adjusted to make both sides balanced before starting work.

[0027] Example 2:

[0028] This embodiment provides an implementation method of a lifting assembly 8 and a hoisting assembly based on embodiment 1.

[0029] like Figure 1 As shown, the lifting assembly 8 includes a winch wound with a first steel wire rope 9. A support rod is fixed to the turntable 1, tilted toward the counterweight 7. A first fixed pulley is mounted on the top of the support rod. The counterweight 7 has a lifting eye. The free end of the first steel wire rope 9 passes through the first fixed pulley and the lifting eye in sequence and is connected to the mast 6.

[0030] like Figure 3 and Figure 4 As shown, a mounting hole 23 for mounting the turntable 1 is formed on the mounting portion 22 , and bolt holes 24 for passing bolts are formed on the mounting portion 22 outside the mounting hole.

[0031] like Figure 1As shown, the hoisting assembly includes a hoisting winch mounted on the turntable 1 and wound with a second steel wire rope 11, and a main boom 5 hinged to the turntable. The main boom 5 is mounted with multiple second fixed pulleys. The free end of the second steel wire rope 11 passes over the multiple second fixed pulleys and extends to the side of the main boom 5 away from the mast 6. A hook is fixed to the free end of the second steel wire rope 11.

[0032] A pull plate 10 is installed at one end of the main arm 5 away from the turntable 1 , and another end of the pull plate 10 away from the main arm 5 is installed on the mast 6 .

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A double turret crane, characterized in that: It comprises a chassis (4), a slewing bearing (3) is mounted on the chassis (4), a turntable connecting member (2) is mounted on the slewing bearing (3), two turntables (1) are arranged on the turntable connecting member (2), and a lifting mechanism is mounted on each turntable (1); The turntable connecting member (2) comprises a symmetrically arranged connecting portion (21), and two mounting portions (22) located on both sides of the connecting portion (21) and used for mounting the turntable (1); the lower surfaces of the two mounting portions (22) are both arranged as curved surfaces, and the two curved surfaces are both recessed toward the upper portion of the connecting portion (21); The lifting mechanism comprises a mast (6) hinged to a turntable (1), a counterweight assembly having a counterweight (7) mounted on the mast (6), a lifting assembly (8) mounted on the turntable (1) for pulling the counterweight (7) to move up and down, and a lifting assembly mounted on the turntable (1) for lifting heavy objects.

2. The double turret crane according to claim 1, characterized in that: The turntable (1) is symmetrically arranged on the turntable connecting member (2) with the rotation axis of the slewing bearing (3) as the symmetry axis.

3. The double turret crane according to claim 1, characterized in that: The lifting assembly (8) comprises a winch on which a first steel wire rope (9) is wound.

4. The double turret crane according to claim 3, characterized in that: A support rod inclined toward the counterweight (7) is fixed on the turntable (1), a first fixed pulley is installed on the top of the support rod, a lifting ring is provided on the counterweight (7), and the free end of the first steel wire rope (9) passes through the first fixed pulley and the lifting ring in sequence and is connected to the mast (6).

5. The double turret crane according to claim 1, characterized in that: The mounting portion (22) is provided with a mounting hole (23) for mounting the turntable (1), and the mounting portion (22) outside the mounting hole is provided with bolt holes (24) for passing bolts.

6. The double turret crane according to claim 1, characterized in that: The connecting portion (21) is installed in the middle portion above the slewing bearing (3).

7. The double turret crane according to claim 1, characterized in that: The lifting assembly comprises a lifting winch mounted on a turntable (1) and wound with a second steel wire rope (11), and a main arm (5) hinged to the turntable (1); a plurality of second fixed pulleys are mounted on the main arm (5); a free end of the second steel wire rope (11) passes over the plurality of second fixed pulleys and extends to a side of the main arm (5) away from the mast (6); a hook is fixed to the free end of the second steel wire rope (11).

8. The double turret crane according to claim 7, characterized in that: A pull plate (10) is installed at one end of the main arm (5) away from the turntable (1), and the end of the pull plate (10) away from the main arm (5) is installed on the mast (6).

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