Rotary structure of tower crane

Abstract

The utility model relates to the technical field of tower cranes, and particularly discloses a slewing structure of a tower crane, an outer ring of an outer tooth slewing bearing is fixed on the top surface of a fixed seat, a slewing seat is fixed on the top surface of a rotating inner ring of the outer tooth slewing bearing, and a driving mechanism is arranged on the slewing seat and is in meshing transmission with an outer tooth ring of the outer tooth slewing bearing; the oiling mechanism comprises an oil tank containing lubricating grease, a vertical pipe fixedly connected to the bottom end of the oil tank in a butt joint mode, a shaft rod rotationally installed in the middle of an inner cavity of the vertical pipe, a spiral blade fixed to the peripheral wall of the shaft rod and a friction wheel fixedly arranged at the bottom end of the shaft rod in a sleeving mode. An annular groove is formed in the position, located on the periphery of the outer tooth slewing bearing, of the top face of the fixing base, the friction wheel makes rolling contact with the inner circumferential wall of the annular groove, a cylindrical shell matched with the vertical pipe in a sleeved mode is fixed to the outer edge of the slewing bearing, and an oil outlet is formed in the side wall, corresponding to the outer tooth slewing bearing, of the cylindrical shell. The problem that lubricating grease is not convenient to coat at the rotating teeth in the tower crane rotating structure is well solved.

Description

Technical Field

[0001] This utility model relates to the field of tower crane technology, specifically to the slewing structure of a tower crane. Background Technology

[0002] Tower cranes are one of the most commonly used lifting devices on construction sites, used to lift construction materials such as steel bars, timber, concrete, and steel pipes. Tower cranes are an indispensable piece of equipment on construction sites. The tower crane tip bears the upper load transmitted from the boom ropes and counterweight boom ropes, and directly transfers this load to the tower structure through structural components such as the slewing mechanism, turntable, and support. Self-erecting tower cranes come in various types, including truncated cone type, forward- or backward-leaning truncated cone type, A-frame type, and inclined bracing type.

[0003] In tower cranes, the slewing structure typically includes a fixed base, an external gear slewing bearing, a slewing base, and a drive mechanism. The drive mechanism transmits power through gears meshing with the external gears of the slewing bearing, enabling the slewing base to rotate relative to the fixed base. Because the transmission structure is a mechanical gear transmission, lubricating grease needs to be applied to the slewing bearing periodically to extend its service life.

[0004] Traditionally, when applying lubricating grease to rotary gears, it is necessary to manually apply the grease evenly to the gears. This operation is a high-altitude operation with limited space, making it very inconvenient and posing a high safety hazard. In addition, the effect of manual application is difficult to guarantee. Utility Model Content

[0005] The purpose of this utility model is to provide a slewing structure for tower cranes, which solves the problem that it is not convenient to apply lubricating grease to the slewing teeth in the current tower crane slewing structure.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a slewing structure for a tower crane, comprising a fixed base, a slewing base, an external gear slewing bearing, and a drive mechanism. The outer ring of the external gear slewing bearing is fixed to the top surface of the fixed base, and the slewing base is fixed to the top surface of the inner rotating ring of the external gear slewing bearing. The drive mechanism is mounted on the slewing base and meshes with the outer gear ring of the external gear slewing bearing. The lubrication mechanism includes an oil tank containing lubricating grease, a vertical pipe fixedly connected to the bottom end of the oil tank, a shaft rotatably mounted in the middle of the inner cavity of the vertical pipe, a spiral blade fixed to the outer peripheral wall of the shaft, and a friction wheel fixedly fitted to the bottom end of the shaft. The top surface of the fixed base is provided with an annular groove at the periphery of the external gear slewing bearing, and the friction wheel rolls in contact with the inner peripheral wall of the annular groove. A cylindrical shell that fits and is sleeved with the vertical pipe is fixed to the outer edge of the slewing base, and the cylindrical shell is provided with an oil outlet corresponding to the side wall of the external gear slewing bearing.

[0007] Preferably, a fixing ring plate is fixedly sleeved at the top of the vertical tube, and the fixing ring plate is fixed to the top surface of the cylindrical shell with screws.

[0008] Preferably, the top opening of the oil tank is detachably fitted with a cover.

[0009] Preferably, the top surface of the slewing seat is provided with a circular groove at the position of the inner rotating ring of the external tooth slewing bearing, and a bolt whose bottom end matches the threaded connection of the inner rotating ring of the external tooth slewing bearing is rotatably fitted on the bottom surface of the circular groove near the outer edge.

[0010] Preferably, the drive mechanism includes a reducer fixed to the outer edge of the top surface of the rotary seat, a motor fixed to the top surface of the reducer and connected to the reducer in a transmission manner, and a gear fixedly mounted on the bottom power output shaft of the reducer and meshing with the outer gear ring of the external gear rotary support.

[0011] Preferably, the net distance between the vertical tube and the tooth tip of the external tooth ring of the external tooth slewing bearing is 1 to 2 mm.

[0012] Preferably, the top of the shaft extends into the inner cavity of the oil tank.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] In the slewing structure of the tower crane involved in this utility model, when the slewing seat rotates relative to the fixed seat, the friction wheel rolls along the annular groove, thereby driving the helical blade to rotate through the shaft, so as to discharge the lubricating grease in the oil tank from the oil outlet to the tooth tip of the outer tooth ring of the external tooth slewing support. The meshing transmission process further coats the lubricating grease on the surface of the slewing teeth, which effectively solves the problem that it is not convenient to coat the slewing teeth with lubricating grease in the slewing structure of the tower crane. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the entire utility model;

[0016] Figure 2 This is a three-dimensional structural diagram of the fixed base and external tooth slewing bearing assembly of this utility model;

[0017] Figure 3 This is a three-dimensional structural diagram of the rotary seat and drive mechanism assembly of this utility model;

[0018] Figure 4 This is a three-dimensional structural diagram of the refueling mechanism of this utility model.

[0019] In the diagram: 1-fixed base; 1.1-annular groove;

[0020] 2-Rotating seat; 2.1-Cylindrical shell; 2.2-Circular groove; 2.3-Bolt;

[0021] 3-External gear slewing bearing;

[0022] 4-Drive mechanism; 4.1-Reducer; 4.2-Motor; 4.3-Gear;

[0023] 5- Refueling mechanism; 5.1- Oil tank; 5.2- Vertical pipe; 5.2.1- Oil outlet; 5.3- Shaft; 5.4- Friction wheel; 5.5- Cover; 5.6- Fixing ring plate; 5.7- Spiral blade. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-4 This utility model provides a technical solution: a slewing structure for a tower crane, wherein the bottom of a fixed base 1 is fixedly connected to the top of the tower body, the outer ring of an external tooth slewing bearing 3 is fixed to the top surface of the fixed base 1, and an annular groove 1.1 is provided on the top surface of the fixed base 1 at the periphery of the external tooth slewing bearing 3.

[0026] A circular groove 2.2 is provided on the top surface of the rotary seat 2, directly opposite the rotating inner ring of the external gear slewing bearing 3. A bolt 2.3, whose bottom end is threadedly fitted onto the bottom surface of the groove 2.2 near its outer edge, is rotatably fitted. That is, the bottom surface of the rotary seat 2 is fixedly connected to the top surface of the rotating inner ring of the external gear slewing bearing 3 by the bolt 2.3. A cylindrical shell 2.1 extending vertically is fixed to the outer edge of the rotary seat 2.

[0027] The drive mechanism 4 includes a reducer 4.1 fixed to the outer edge of the top surface of the rotary seat 2, a motor 4.2 fixed to the top surface of the reducer 4.1 and connected to the reducer 4.1 for transmission, and a gear 4.3 fixedly mounted on the bottom power output shaft of the reducer 4.1 and meshing with the external gear ring of the external gear slewing bearing 3. That is, the motor 4.2 drives the gear 4.3 to rotate through the reducer 4.1. Due to the meshing relationship between the gears 4.3, the rotary seat 2 rotates relative to the fixed seat 1.

[0028] The refueling mechanism 5 includes an oil tank 5.1 containing lubricating grease, a vertical pipe 5.2 fixedly connected to the bottom of the oil tank 5.1, a shaft 5.3 rotatably mounted in the middle of the inner cavity of the vertical pipe 5.2, a spiral blade 5.7 fixed to the outer peripheral wall of the shaft 5.3, and a friction wheel 5.4 fixedly fitted to the bottom of the shaft 5.3. The friction wheel 5.4 rolls in contact with the inner peripheral wall of the annular groove 1.1. The cylindrical shell 2.1 has an oil outlet 5.2.1 corresponding to the side wall of the external gear slewing bearing 3. To facilitate the assembly and connection of the refueling mechanism 5 and the slewing seat 2, a fixing ring plate 5.6 is fixedly fitted to the top of the vertical pipe 5.2, and the fixing ring plate 5.6 is fixed to the top surface of the cylindrical shell 2.1 with screws. Additionally, to facilitate the replenishment of lubricating grease into the oil tank 5.1, a cover 5.5 is detachably fitted to the open top of the oil tank 5.1. The net distance between the vertical pipe 5.2 and the tooth tip of the external gear ring of the external gear slewing bearing 3 is 1–2 mm. The top end of the shaft 5.3 extends into the inner cavity of the oil tank 5.1, and the inner peripheral wall of the oil tank 5.1 is provided with a bearing seat for rotating and supporting the top end of the shaft 5.3. That is, the outer peripheral walls of the shaft 5.3 located in the inner cavity of the oil tank 5.1 and the inner cavity of the vertical pipe 5.2 are respectively fixed with helical blades 5.7.

[0029] In summary, when the drive mechanism 4 drives the rotary seat 2 to rotate relative to the fixed seat 1, the friction wheel 5.4 rolls against the inner circumferential wall of the annular groove 1.1. That is, the friction wheel 5.4 drives the shaft 5.3 to rotate, and the spiral blade 5.7, which rotates synchronously with the shaft 5.3, continuously pushes the lubricating grease in the oil tank 5.1 downwards, and finally discharges it from the oil outlet 5.2.1. The oil outlet 5.2.1 is directly opposite to and close to the tooth tip of the outer gear ring of the external gear rotary bearing 3, so that the discharged lubricating grease is coated on the tooth tip of the outer gear ring of the external gear rotary bearing 3. When the gear 4.3 passes through the part of the outer gear ring coated with lubricating grease, it will further coat the rotary gear structure with lubricating grease, so as to achieve the purpose of automatically coating the rotary gear with lubricating grease.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A slewing structure for a tower crane, comprising a fixed base (1), a slewing base (2), an external gear slewing bearing (3), and a drive mechanism (4), wherein the outer ring of the external gear slewing bearing (3) is fixed to the top surface of the fixed base (1), the slewing base (2) is fixed to the top surface of the inner rotating ring of the external gear slewing bearing (3), and the drive mechanism (4) is mounted on the slewing base (2) and meshes with the external gear ring of the external gear slewing bearing (3) for transmission, characterized in that, Also includes: The refueling mechanism (5) includes an oil tank (5.1) containing lubricating grease, a vertical pipe (5.2) fixedly connected to the bottom end of the oil tank (5.1), a shaft (5.3) rotatably installed in the middle of the inner cavity of the vertical pipe (5.2), a spiral blade (5.7) fixed to the outer peripheral wall of the shaft (5.3), and a friction wheel (5.4) fixedly fitted to the bottom end of the shaft (5.3). The top surface of the fixed seat (1) is provided with an annular groove (1.1) located around the outer tooth slewing bearing (3). The friction wheel (5.4) rolls in contact with the inner circumferential wall of the annular groove (1.1). The outer edge of the slewing seat (2) is fixed with a cylindrical shell (2.1) that fits and matches the vertical pipe (5.2). The cylindrical shell (2.1) is provided with an oil outlet (5.2.1) corresponding to the side wall of the outer tooth slewing bearing (3).

2. The slewing structure of the tower crane according to claim 1, characterized in that: The top end of the vertical tube (5.2) is fixedly fitted with a fixing ring plate (5.6), which is fixed to the top surface of the cylindrical shell (2.1) with screws.

3. The slewing structure of the tower crane according to claim 1, characterized in that: The oil tank (5.1) has a detachable cover (5.5) fitted at the top opening.

4. The slewing structure of the tower crane according to claim 1, characterized in that: The top surface of the slewing seat (2) is provided with a circular groove (2.2) opposite to the inner ring of the external tooth slewing bearing (3). The bottom surface of the circular groove (2.2) near the outer edge is fitted with a bolt (2.3) whose bottom end is threaded and matched with the inner ring of the external tooth slewing bearing (3).

5. The slewing structure of the tower crane according to claim 1, characterized in that: The drive mechanism (4) includes a reducer (4.1) fixed to the outer edge of the top surface of the rotary seat (2), a motor (4.2) fixed to the top surface of the reducer (4.1) and connected to the reducer (4.1) in transmission, and a gear (4.3) fixedly mounted on the bottom power output shaft of the reducer (4.1) and meshing with the external gear ring of the external gear slewing bearing (3).

6. The slewing structure of the tower crane according to claim 1, characterized in that: The net distance between the vertical tube (5.2) and the tooth tip of the external tooth ring of the external tooth slewing bearing (3) is 1-2 mm.

7. The slewing structure of the tower crane according to claim 1, characterized in that: The top of the shaft (5.3) extends into the inner cavity of the oil tank (5.1).

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