Slewing bearing positioning device of tower crane

Abstract

The invention discloses a tower crane slewing bearing positioning device which comprises a slewing assembly, the slewing assembly is composed of a slewing mechanism, an upper slewing bearing frame, a slewing bearing and a lower slewing bearing frame, the slewing mechanism is in meshed drive with the slewing bearing through an output pinion, the upper slewing bearing frame is provided with an upper slewing bearing frame flange face, and the lower slewing bearing frame is provided with a lower slewing bearing frame flange face. A first positioning hole is formed in the flange face of the upper rotary bearing frame, the lower rotary bearing frame is provided with a lower rotary bearing frame flange face, a second positioning hole is formed in the flange face of the lower rotary bearing frame, the rotary bearing is provided with a third positioning hole and a fourth positioning hole, and the first positioning hole and the third positioning hole are fixed through positioning reamed bolts. And the second positioning hole and the fourth positioning hole are fixed through a positioning reamed bolt. The positioning function can be completed by punching the positioning holes in the flange face and combining the positioning reamed bolts, the machining amount of parts can be reduced, precise positioning can be achieved, and the high-strength load use working condition of the slewing bearing is met.

Description

Technical Field

[0001] The invention relates to the technical field of tower crane assembly, and in particular to a slewing bearing positioning device for a tower crane. Background Art

[0002] The slewing bearing is a large bearing that can withstand complex and complex loads. It can withstand large axial and radial loads and overturning moments at the same time. It is widely used in large slewing devices such as lifting machinery, mining machinery, construction machinery, port machinery, ship machinery, high-precision radar machinery and missile launchers. In the structure of a tower crane, the slewing assembly is located between the standard section of the tower body and the top of the tower. It bears the axial, radial loads and bending moments generated by the upper part of the tower crane. It is a key load-bearing component of the tower crane. Once a slewing bearing has a problem, it must be dismantled and replaced. The work is cumbersome and dangerous, which seriously affects the progress of the project and increases the project cost.

[0003] At present, the main positioning method for slewing bearings is the stopper positioning method. By machining the stepped stopper on the mounting flange surface of the upper and lower slewing support frames, the stepped circumferential vertical surface is closely matched with the inner and outer rings of the slewing bearing respectively, and the stepped circumferential vertical surface is used as the positioning reference of the slewing bearing to achieve the purpose of positioning the slewing bearing. Since the mounting flange surface of the slewing bearing has a circular step protruding from the plane, it needs to be machined by a vertical large lathe, and the fastening bolt holes need to be machined by a gantry boring and milling machine, and multiple clamping and center calibration are required, the machining volume is large, and the processing cost is relatively high.

[0004] Based on this, a slewing bearing positioning device for a tower crane is proposed. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a slewing bearing positioning device for a tower crane. In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0006] A slewing bearing positioning device for a tower crane comprises a slewing assembly, which is composed of a slewing mechanism, a slewing upper supporting frame, a slewing bearing and a slewing lower supporting frame. The slewing mechanism is driven by meshing with the slewing bearing through an output pinion. The slewing upper supporting frame is provided with a slewing upper supporting frame flange surface, and the slewing upper supporting frame flange surface is provided with a first positioning hole. The slewing lower supporting frame is provided with a slewing lower supporting frame flange surface, and the slewing lower supporting frame flange surface is provided with a second positioning hole. The slewing bearing is provided with a third positioning hole and a fourth positioning hole. The first positioning hole and the third positioning hole are fixed by positioning hinge bolts, and the second positioning hole and the fourth positioning hole are fixed by positioning hinge bolts.

[0007] Preferably, the positioning hinge bolt comprises a bare section, an interference fit section and a threaded section in sequence.

[0008] Preferably, the outer diameter of the interference fit section is larger than the outer diameter of the bare section.

[0009] Preferably, the outer diameter of the interference fit section is consistent with the inner diameters of the third positioning hole and the fourth positioning hole, and the first positioning hole and the second positioning hole of the slewing bearing.

[0010] Preferably, the outer diameter of the interference fit section is greater than the outer diameter of the threaded section.

[0011] Preferably, the length of the interference fit section overlaps with that of the upper swivel support frame and the lower swivel support frame by 20-30 mm.

[0012] Preferably, the slewing bearing and the slewing upper support frame are provided with four groups of positioning holes which are evenly distributed at equal distances.

[0013] Preferably, the slewing bearing and the slewing upper support frame are provided with four groups of positioning holes which are evenly distributed at equal distances.

[0014] To enable the upper structure of the tower crane (boom, balance arm, tower top, etc.) to complete the rotation movement, the meshing accuracy of the output pinion and the slewing bearing directly affects the rotation stability of the tower crane and the service life of the slewing bearing. By positioning the slewing bearing with positioning hinge bolts, the meshing accuracy can be better guaranteed, the interchangeability of product components can be improved, batch production of products can be facilitated, and product quality can be improved.

[0015] In summary, since the present invention adopts the above technical solution, the present invention has the following technical effects:

[0016] 1. The present invention sets a first positioning hole on the flange surface of the upper slewing support frame, sets a second positioning hole on the flange surface of the lower slewing support frame, and sets a third positioning hole and a fourth positioning hole on the slewing support. It is only necessary to punch positioning holes on the flange surface and combine them with positioning hinged bolts to complete the positioning function, which can reduce the processing amount of parts and components and achieve precise positioning, thereby meeting the high-intensity load use conditions of the slewing support.

[0017] 2. The present invention uses positioning hinged bolts to fix in the positioning hole, which makes it easy to ensure the installation meshing accuracy of the slewing bearing and the pinion, and reduces the adjustment amount during installation to a certain extent; the four sets of hinged bolts can offset part of the radial force generated by the slewing operation of the tower crane to a certain extent; since the installation surfaces of the slewing upper support frame and the slewing lower support frame are flat, they do not need to go through the vertical turning process, which reduces repeated positioning, has a higher processing efficiency, high product positioning accuracy, and product components can achieve interchangeability.

[0018] 3. The present invention enables the third positioning hole and the fourth positioning hole of the slewing bearing to be aligned with the first positioning hole of the upper slewing support frame and the second positioning hole of the lower slewing support frame respectively, and are locked by specially made hinged positioning bolts. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the rotary assembly of the present invention;

[0020] Figure 2 It is a cross-sectional view of a slewing bearing positioning device for a tower crane of the present invention;

[0021] Figure 3 The present invention Figure 2 The enlarged view of point A in the middle;

[0022] Figure 4 It is a structural schematic diagram of the positioning hinge bolt of the present invention.

[0023] In the accompanying drawings, 1, slewing mechanism, 2, slewing upper supporting frame, 3, slewing bearing, 4, slewing lower supporting frame, 5, positioning hinge bolt, 6, first positioning hole, 7, second positioning hole, 8, third positioning hole, 9, fourth positioning hole, 10, flange surface of slewing upper supporting frame, 11, bare section, 12, interference fit section, 13, threaded section, 14, flange surface of slewing lower supporting frame. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are only for the purpose of enabling the reader to have a thorough understanding of one or more aspects of the present invention, and these aspects of the present invention can be implemented even without these specific details.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] See also Figure 1-4As shown, a slewing bearing positioning device for a tower crane includes a slewing assembly, which is composed of a slewing mechanism 1, a slewing upper supporting frame 2, a slewing bearing 3 and a slewing lower supporting frame 4. The slewing mechanism 1 is driven by meshing with the slewing bearing 3 through an output pinion. The slewing upper supporting frame 2 is provided with a slewing upper supporting frame flange surface 10, and the slewing upper supporting frame flange surface 10 is provided with a first positioning hole 6. The slewing lower supporting frame 4 is provided with a slewing lower supporting frame flange surface 14, and the slewing lower supporting frame flange surface 14 is provided with a second positioning hole 7. The slewing bearing 3 is provided with a third positioning hole 5 and a fourth positioning hole 9. The first positioning hole 6 and the third positioning hole 8 are fixed by positioning hinge bolts 5, and the second positioning hole 7 and the fourth positioning hole 9 are fixed by positioning hinge bolts 5.

[0027] In one embodiment, the positioning hinge bolt 5 includes a bare section 11, an interference fit section 12 and a threaded section 13 in sequence. The outer diameter of the interference fit section 12 is greater than the outer diameter of the bare section 11.

[0028] In one embodiment, the outer diameter of the interference fit section 12 is consistent with the inner diameters of the third positioning hole 8 and the fourth positioning hole 9 , and the first positioning hole 6 and the second positioning hole 7 of the slewing bearing 3 .

[0029] In one embodiment, the outer diameter of the interference fit section 12 is greater than the outer diameter of the threaded section 13 .

[0030] In one embodiment, the length of the interference fit section 12 overlaps with the upper swivel support frame 2 and the lower swivel support frame 4 by 20-30 mm.

[0031] In one embodiment, the slewing bearing 3 and the slewing upper support frame 2 have four groups of positioning holes evenly spaced apart, and the slewing bearing 3 and the slewing upper support frame 4 have four groups of positioning holes evenly spaced apart.

[0032] In summary, the working principle of the slewing bearing positioning device of a tower crane of the present invention is: the positioning method of the hinged bolt hole of the present invention (such as Figure 3 As shown in the figure, four groups of equidistant positioning holes on the upper slewing support frame 2, the slewing support 3, and the lower slewing support frame 4 are selected for fine processing, and the four corresponding positioning fastening bolts 5 are designed as specially made reamed hole bolts, so that they form an interference fit with the holes corresponding to the upper slewing support frame 2, the lower slewing support frame 4, and the slewing support 3 to achieve the positioning and matching effect; the specially made positioning reamed hole bolts 5 (as shown in the figure) are selected for fine processing, and the corresponding four sets of positioning fastening bolts 5 are designed as specially made reamed hole bolts, so that they form an interference fit with the holes corresponding to the upper slewing support frame 2, the lower slewing support frame 4, and the slewing support 3 to achieve the positioning and matching effect; the specially made positioning reamed hole bolts 5 (as shown in the figure) are designed as specially made positioning re Figure 4As shown in the figure, the outer diameter of the bare section 11 of the screw is d, and the outer diameter of the finely machined section in the middle part (i.e., the interference fit section 12) is D. The interference fit section 12 is basically consistent with the third positioning hole 8, the fourth positioning hole 9 of the slewing bearing 3, the first positioning hole 6 of the flange surface 10 of the slewing upper support frame, and the second positioning hole 7 of the flange surface 14 of the slewing lower support frame. The lower end is a conventional threaded section 13 structure for installing a fastening nut. The diameter of the threaded section 13 is d, where D is slightly larger than d. Considering the convenience of installation, the length of the screw with a diameter of D does not need to be made very long, and it is sufficient to ensure that there is a 20mm to 30mm overlap section with the slewing support frame. During installation and positioning, a portion of the middle section (diameter D section) of the hinged positioning bolt 5 coincides with the flange surface 10 of the upper slewing support frame and the flange surface 14 of the lower slewing support frame, and the other portion coincides with the slewing bearing 3. Since the diameter of this section is an interference fit with the flange surface 10 of the upper slewing support frame, the flange surface 14 of the lower slewing support frame and the aperture of the slewing bearing 3, it plays a role in positioning and fixing.

[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 principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A slewing bearing positioning device for a tower crane, characterized in that: The invention comprises a slewing assembly, which is composed of a slewing mechanism, an upper slewing support frame, a slewing support and a lower slewing support frame. The slewing mechanism is driven by meshing with the slewing support through an output pinion. The upper slewing support frame is provided with a slewing upper support frame flange surface, and the upper slewing support frame flange surface is provided with a first positioning hole. The lower slewing support frame is provided with a slewing lower support frame flange surface, and the lower slewing support frame flange surface is provided with a second positioning hole. The slewing support is provided with a third positioning hole and a fourth positioning hole. The first positioning hole and the third positioning hole are fixed by positioning hinge bolts, and the second positioning hole and the fourth positioning hole are fixed by positioning hinge bolts.

2. A tower crane slewing bearing positioning device according to claim 1, characterized in that: The positioning hinge bolt comprises a bare section, an interference fit section and a threaded section in sequence.

3. A tower crane slewing bearing positioning device according to claim 2, characterized in that: The outer diameter of the interference fit section is greater than the outer diameter of the bare section.

4. A tower crane slewing bearing positioning device according to claim 3, characterized in that: The outer diameter of the interference fit section is consistent with the inner diameters of the third positioning hole and the fourth positioning hole, the first positioning hole and the second positioning hole of the slewing bearing.

5. The tower crane slewing bearing positioning device according to claim 2, characterized in that: The outer diameter of the interference fit section is greater than the outer diameter of the threaded section.

6. A tower crane slewing bearing positioning device according to claim 4, characterized in that: The length of the interference fit section overlaps with the upper rotary support frame and the lower rotary support frame by 20-30 mm.

7. A tower crane slewing bearing positioning device according to claim 4, characterized in that: The slewing bearing and the slewing upper support frame are evenly and equidistantly provided with four groups of positioning holes.

8. A tower crane slewing bearing positioning device according to claim 4, characterized in that: The slewing bearing and the slewing upper support frame are evenly and equidistantly provided with four groups of positioning holes.

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