Gap-adjustable rotary speed reducer for tower crane

Abstract

The invention relates to a gap-adjustable rotary speed reducer for a tower crane, which comprises a rotary speed reducer mounting flange, a high point mark and a plurality of connecting holes, and the eccentric design of the connecting holes enables a user to adjust the backlash by rotating the position of the rotary speed reducer so as to ensure that the rotary motion of the tower crane is stable and safe. Meanwhile, a plurality of groups of hole sites with deflection angles are machined on the flange, so that the backlash adjusting range is further expanded, and more adjusting options are provided. According to the technical scheme, by effectively adjusting the backlash, the stability and safety of rotation of the tower crane are improved, the service life of equipment is prolonged, operation noise and energy consumption are reduced, and the backlash adjusting device has high practical value and wide application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of tower cranes, and in particular to a swing reducer for tower cranes with adjustable clearance. Background Art

[0002] With the continuous development of the tower crane industry, customers have higher and higher requirements for its quality. Among them, the swing motion transmitted by the swing reducer is a key motion form of the tower crane operation, which directly affects key indicators such as the smoothness and safety during the tower crane movement.

[0003] The swing motion of the tower crane boom is realized by the meshing of the output gear of the swing reducer with the race ring of the slewing bearing installed under the tower crane boom, and the rotation of the slewing bearing drives the boom to rotate. Among them, when the output pinion of the swing reducer meshes with the race ring of the slewing bearing, the meshing backlash between the gears is particularly crucial. Only when this backlash is within an ideal range can the tower crane operate smoothly and safely.

[0004] Since the tower crane swing reducer and the tower crane slewing bearing are fixedly installed on the tower crane, it is very difficult to adjust after installation, which directly leads to the difficulty in adjusting the meshing backlash between the output gear of the tower crane swing reducer and the race ring of the tower crane slewing bearing after installation, and this backlash deviation will continuously increase with use and wear, resulting in worse meshing conditions. This causes the smoothness and safety of the tower crane to gradually decline over the service life and increases energy consumption.

[0005] Currently, there is no effective solution to this problem of the swing reducer used on tower cranes. The backlash deviation can only exist naturally and continue to increase until it seriously affects the use, and then a new reducer or slewing bearing needs to be replaced. Summary of the Invention

[0006] The purpose of the present invention is to provide a swing reducer for tower cranes with adjustable clearance to improve the use effect of the swing reducer and the slewing bearing and extend the service life.

[0007] The present invention is implemented by the following technical solutions: A swing reducer for tower cranes with adjustable clearance, characterized in that it includes a swing reducer, a swing reducer mounting flange and a plurality of connecting holes I, wherein the connecting holes I are evenly distributed on the swing reducer mounting flange and are fixedly connected to the tower crane structure through the connecting holes I, and the center line of the connecting holes I between the swing reducer and the tower crane structure deviates from the center line of the swing reducer output shaft by a certain distance.

[0008] Further, a high point mark is provided on the swing reducer mounting flange for indicating the maximum backlash state when the swing reducer meshes with the race ring of the slewing bearing. Furthermore, the connection phase between the adjustment connection holes 1 of the rotary reducer mounting flange and the tower crane structure is adjusted to dynamically adjust the gear meshing backlash between the rotary reducer and the slewing bearing.

[0009] Furthermore, a number of connection holes 2 are also provided on the rotary reducer mounting flange.

[0010] Furthermore, the connection holes 2 are deflected by a certain angle relative to the connection holes 1.

[0011] Furthermore, the connection holes 2 are also evenly distributed on the rotary reducer mounting flange, and the tower crane structure can also be fixedly connected through the connection holes 2.

[0012] The beneficial effects of the adjustable-backlash rotary reducer for tower cranes according to the present invention include: By adjusting the position of the connection holes between the rotary reducer and the tower crane, the present invention can adjust the gear meshing backlash between the rotary reducer and the slewing bearing. This enables the meshing state between the rotary reducer and the slewing bearing to be maintained within an ideal range, thereby ensuring the smoothness and safety of the slewing motion of the tower crane and reducing the occurrence of equipment failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. The following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0014] Figure 1 It is a schematic installation diagram of a rotary reducer for a tower crane; Figure 2 It is a schematic structural diagram of the first embodiment of the rotary reducer of the present invention; Figure 3 It is a schematic structural diagram of the second embodiment of the rotary reducer of the present invention In the figure, 1 - tower arm, 2 - gear ring, 3 - slewing support, 4 - tower body, 5 - rotary reducer, 6 - rotary motor, 51 - mounting flange, 52 - high point mark, 53 - connection hole 1, 54 - connection hole 2. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0017] As Figures 1-3 shown, a swing reducer for a tower crane with adjustable clearance includes a swing reducer mounting flange 51, a high point mark 52, and a first connecting hole 53. Among them Figure 1 The structural principle of the tower crane achieving swing motion is shown, including a tower arm 1, a gear ring 2, a slewing bearing 3, a tower body 4, a swing reducer 5, and a swing motor 6. Among them, the swing reducer 5 and the swing motor 6 are fixedly connected to the tower arm 1. The output gear of the swing reducer 5 meshes with the gear ring 2. The gear ring 2 is fixed to the slewing bearing 3, and the slewing bearing 3 is fixedly connected to the tower body 4. The bottom of the tower body 4 is relatively fixed. When the swing motor 6 moves, the output gear of the swing reducer 5 and the gear ring 2 perform a revolution, thereby driving the tower arm 1 to perform a swing motion.

[0018] In the first embodiment, the center lines of the mounting stop and the first connecting hole 53 related to the connection of the swing reducer and the tower crane deviate from the center line of the output shaft by a certain distance (the eccentricity can be customized according to the reducer structure and the layout of the tower crane), and an obvious high point mark is made on the mounting flange 51 of the swing reducer, indicating that when this mark is closest (external meshing) or farthest (internal meshing) from the swing center, the side clearance of the gear meshing is the maximum value at this time.

[0019] When the side clearance between the output gear of the swing reducer and the gear ring of the slewing bearing is inappropriate and abnormal noises occur, the smoothness deteriorates, etc., the phase of the first connecting hole 53 of the swing reducer can be rotated to dynamically adjust the side clearance to a relatively ideal state.

[0020] Obviously, when there are n equally distributed first connecting holes 53, there are n / 2 + 1 different side clearance adjustment values to choose from (rounding down). Taking Figure 2 the installation method as an example, when the reducer has n = 12 equally distributed first connecting holes 53, there are 7 center distances corresponding to different side clearance values to choose from. The positive and negative directions are respectively applied to two modes of internal meshing or external meshing.

[0021] It is worth mentioning that the offset distance shown in the figure is magnified for the convenience of display.

[0022] In the second embodiment, on the basis of the first embodiment, another group or multiple groups of equally distributed hole positions are machined by deflecting a certain angle, such as the second connecting hole 54.

[0023] Obviously, through different combinations of hole positions, the first connecting hole 53 or the second connecting hole 54 can be respectively connected to the tower crane installation holes. Then, when the number of tower crane installation holes is n and they are evenly distributed, and the flange hole positions of the reducer are processed with m groups of holes deflected at different angles, then except for the first set of pairing methods with symmetric distribution, other pairing methods will not have symmetric values due to misalignment of deflection. The number of optional methods is n(m - 1). In summary, the number of adjustable values is (n / 2 + 1) + n(m - 1) different backlash adjustment values (rounded down). Taking the above figure matching scheme as an example, when the reducer has n = 12 holes evenly distributed and m = 2 groups of hole positions respectively, there are 19 different backlash adjustment values available. The positive and negative directions are respectively applied to two methods of internal meshing or external meshing.

[0024] In the above embodiments, the basic principles, main features and advantages of the present invention are described. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, any modifications and changes made by those skilled in the art that do not depart from the spirit and scope of the present invention should fall within the protection scope of the appended claims of the present invention.

Claims

1. A slewing reducer for a tower crane with adjustable clearance, characterized in that: The invention comprises a slewing reducer (5), a slewing reducer mounting flange (51) and a plurality of connection holes (53), wherein the connection holes (53) are evenly distributed on the slewing reducer mounting flange (51), and are fixedly connected to the tower crane structure through the connection holes (53), and the center line of the connection hole (53) between the slewing reducer (5) and the tower crane structure deviates by a certain distance relative to the center line of the slewing reducer output shaft.

2. The slewing reducer for tower crane with adjustable clearance according to claim 1, characterized in that: The slewing reducer mounting flange (51) is provided with a high point mark (52) for indicating the maximum side clearance state when the slewing reducer is meshed with the slewing support gear ring.

3. The adjustable clearance tower crane slewing reducer according to claim 1, characterized in that: The connection phase between the connection hole 1 (53) and the tower crane structure is adjusted by rotating the slewing reducer mounting flange (51), thereby dynamically adjusting the gear meshing backlash between the slewing reducer (5) and the slewing bearing.

4. The slewing reducer for tower crane with adjustable clearance according to claim 1, characterized in that: The rotary reducer mounting flange (51) is also provided with a plurality of second connecting holes (54).

5. The clearance-adjustable slewing reducer for tower crane according to claim 4, characterized in that: The second connecting hole (54) is deflected by a certain angle relative to the first connecting hole (53).

6. The slewing reducer for tower crane with adjustable clearance according to claim 4, characterized in that: The second connection holes (54) are also evenly distributed on the slewing reducer mounting flange (51), and can also be fixedly connected to the tower crane structure through the second connection holes (54).

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