Swing mechanism of gantry crane

Abstract

The utility model discloses a slewing mechanism of a gantry crane. The slewing mechanism comprises a crane slewing bearing structure, the crane rotary table is arranged on the crane slewing bearing structure; the speed reducing motor assembly is arranged on the crane rotary table; the gear structure is arranged on an output shaft of the gear motor assembly; the gear structure is meshed with a slewing gear ring of a slewing bearing structure of the crane; the gear structure is connected with the output shaft through a forming connecting structure. According to the slewing mechanism of the gantry crane, the connection mode of the output shaft of the gear motor assembly and the gear structure is specially improved, and the connection matching area of the output shaft of the gear motor assembly and the gear structure is a positioning part and a torque transmission part. According to the slewing mechanism of the gantry crane, the problem of abnormal sound faults in the process of driving the crane to rotate can be solved, and the operation reliability of the whole crane is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to portal crane technical field, concretely, especially relates to a portal crane slewing mechanism. BACKGROUND

[0002] The existing portal crane slewing mechanism comprises a reduction motor assembly, a brake device, a gear structure arranged at the shaft end of the reduction motor and a slewing bearing in meshing transmission with the gear structure, the reduction motor assembly is arranged in the upper and lower mounting rings and is mounted on the upper and lower panels of the turntable structure through the upper and lower mounting rings.

[0003] In the prior art, when the reduction motor needs to drive the crane to rotate, the portal crane slewing mechanism often has abnormal sound when driving the crane to rotate, which causes damage to the shaft and gear structure of the reduction motor and affects the operation reliability of the crane.

[0004] Therefore, how to provide a portal crane slewing mechanism which can overcome the abnormal sound problem in driving the crane to rotate and improve the operation reliability of the crane has become a technical problem to be solved by those skilled in the art. UTILITY MODEL CONTENTS

[0005] To solve the above technical problems, the utility model provides a portal crane slewing mechanism which can overcome the abnormal sound problem in driving the crane to rotate and improve the operation reliability of the crane.

[0006] The technical scheme provided by the utility model is as follows:

[0007] The utility model provides a portal crane slewing mechanism, which comprises: a crane slewing bearing structure; a crane turntable arranged on the crane slewing bearing structure; a reduction motor assembly arranged on the crane turntable; a gear structure arranged on the output shaft of the reduction motor assembly; the gear structure is in meshing transmission with the slewing gear ring of the crane slewing bearing structure; and the gear structure is connected with the output shaft through a shaped connecting structure.

[0008] Further, in a preferred mode of the utility model,

[0009] The cross-sectional shape of the shaped connecting structure is a non-circular shape.

[0010] Further, in a preferred mode of the utility model,

[0011] The cross-sectional shape of the shaped connecting structure is one of a non-circular curve shape, a straight line shape, an arc shape and a shape composed of a curve and a straight line.

[0012] Further, in a preferred mode of the utility model,

[0013] The cross-sectional shape of the formed connecting structure is one of rectangular, square, drum-shaped, and hat-shaped.

[0014] Further, in a preferred mode of the utility model,

[0015] The output shaft is provided with a shaft shoulder structure for positioning the gear structure;

[0016] The end of the output shaft is detachably provided with a shaft end baffle;

[0017] The gear structure is arranged on the output shaft through cooperation of the shaft end baffle and the shaft shoulder structure.

[0018] Further, in a preferred mode of the utility model, a gap exists between the upper end face of the gear structure and the shaft shoulder structure; or

[0019] A gap exists between the lower end face of the gear structure and the shaft end baffle.

[0020] Further, in a preferred mode of the utility model,

[0021] The distance from the shaft shoulder structure to the end of the output shaft is B, the thickness of the gear structure is A, A < B; B-A = L, and the L is 0.1-0.5 mm.

[0022] Further, in a preferred mode of the utility model, a gusset structure is arranged on the end, and the gusset structure is located between the end and the shaft end baffle.

[0023] Further, in a preferred mode of the utility model, the outer dimension diameter of the gusset structure is less than or equal to the hole diameter of the gear structure 4.

[0024] Further, in a preferred mode of the utility model, the gusset structure is a plastic gusset.

[0025] Further, in a preferred mode of the utility model,

[0026] The shaft end baffle is detachably arranged on the end through a fastener.

[0027] Further, in a preferred mode of the utility model, the bottom of the crane turntable is mounted on the crane slewing bearing structure through a bearing structure;

[0028] The slewing ring structure of the crane turntable is oppositely provided with a slewing ring upper panel and a slewing ring lower panel;

[0029] The motor mounting hole of the upper panel of the rotary table is provided with an upper mounting ring;

[0030] The motor mounting hole of the upper panel of the rotary table is provided with an upper mounting ring;

[0031] The motor mounting hole of the lower panel of the rotary table is provided with a lower mounting ring;

[0032] The reduction motor assembly is mounted on the crane rotary table through the upper mounting ring and the lower mounting ring.

[0033] Compared with the prior art, the portal crane slewing mechanism comprises: a crane slewing support structure; a crane rotary table arranged on the crane slewing support structure; a reduction motor assembly arranged on the crane rotary table; a gear structure arranged on an output shaft of the reduction motor assembly; the gear structure is engaged with a slewing gear ring of the crane slewing support structure; and the gear structure is connected with the output shaft through a formed connecting structure. In the portal crane slewing mechanism, the connection mode of the output shaft of the reduction motor assembly and the gear structure is specially improved, the connection and matching area is both a positioning part and a torque transmission part, which is different from the situation that the relative rotation of the gear structure on the reduction motor shaft occurs due to the inconsistent gap between the positioning surface and the torque transmission spline segment in the prior art, the design of the formed connecting structure integrates the positioning and torque transmission functions, eliminates the relative rotation caused by the inconsistent gap between the spline backlash and the positioning surface, avoids abnormal sound and component damage, and thus the problems of abnormal sound or component damage such as gear or reduction motor shaft during driving the crane to rotate in the prior art can be avoided, and compared with the prior art, the portal crane slewing mechanism can overcome the abnormal sound fault problem during driving the crane to rotate, and improve the operation reliability of the crane. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0035] Figure 1 The schematic diagram of the overall mechanism of the portal crane slewing mechanism provided in the embodiments of the present application is shown in the figure.

[0036] Figure 2 The schematic diagram of the gear structure and the slewing gear ring transmission structure provided in the embodiments of the present application is shown in the figure.

[0037] Figure 3The utility model provides a scheme schematic drawing that the gap between the shaft end baffle and the gear structure is formed by controlling the length of the output shaft.

[0038] Figure 4 The utility model provides a scheme schematic drawing that the gap between the shaft end baffle and the gear structure is formed by increasing the shim structure.

[0039] Figure 5 The utility model provides a schematic diagram of the connection structure between the speed reducer assembly and the crane rotary table.

[0040] Figure 6 The utility model provides a schematic diagram of the cross section of the formed connection structure being drum-shaped.

[0041] Figure 7 The utility model provides a schematic diagram of the cross section of the formed connection structure being hat-shaped.

[0042] Figure 8 The utility model provides a schematic diagram of the cross section of the formed connection structure being square. DETAILED DESCRIPTION

[0043] In order to make the skilled in the art better understand the technical scheme in the utility model, the technical scheme in the utility model embodiments will be described clearly and completely below in conjunction with the drawings of the utility model embodiments. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the skilled in the art without creative labor fall within the scope of the utility model.

[0044] It should be noted that when an element is referred to as being "fixedly connected" or "set on" another element, it can be directly on the other element or indirectly on the other element; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element.

[0045] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "first", "second", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0046] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood to indicate or imply relative importance or imply the number of indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality of" or "several" is two or more, unless otherwise explicitly specified.

[0047] It should be understood that the structures, proportions, sizes, etc. shown in the drawings of the present application are only used to cooperate with the disclosed content for understanding and reading by those skilled in the art, and are not used to limit the implementation conditions of the present application, so they do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0048] As shown in Figures 1 to 8 The present application provides a portal crane slewing mechanism, comprising: a crane slewing support structure 1; a crane turntable 2 provided on the crane slewing support structure 1; a reduction motor assembly 3 provided on the crane turntable 2; a gear structure 4 provided on the output shaft 301 of the reduction motor assembly 3; the gear structure 4 is engaged with the slewing gear ring 101 of the crane slewing support structure 1; the gear structure 4 is connected with the output shaft 301 through a shaped connection structure. In the portal crane slewing mechanism provided by the present application, the output shaft of the reduction motor assembly 3 is connected with the gear structure in a special way. The connection and matching area is both a positioning part and a torque transmission part, which is different from the situation that the positioning surface and the torque transmission spline segment are separated in the prior art, resulting in inconsistent gaps at two places, causing the gear structure to rotate relatively on the reduction motor shaft. The design of the shaped connection structure integrates the positioning and torque transmission functions, eliminates the relative rotation caused by the inconsistency between the spline backlash and the positioning surface gap, avoids abnormal noise and component damage, and thus can avoid the problems of abnormal noise or component damage such as gear or reduction motor shaft when driving the crane to rotate in the existing slewing mechanism. Compared with the prior art, the portal crane slewing mechanism of the present application can overcome the abnormal noise problem in driving the crane to rotate, and improve the operation reliability of the crane.

[0049] The technical solutions of the present application will be described in detail below in combination with embodiments:

[0050] The utility model discloses an embodiment of the utility model includes: crane slewing bearing structure 1;Setting crane slewing bearing structure 1 on crane turntable 2;Setting crane turntable 2 on reduction motor assembly 3;Gear structure 4 is set on the output shaft 301 of reduction motor assembly 3;Gear structure 4 with crane slewing bearing structure 1's slewing gear ring 101 mesh;Gear structure 4 is connected with the output shaft 301 through the shaped connecting structure. Specifically, in the utility model embodiment, the cross section shape of the shaped connecting structure is non-circular shape.

[0051] Specifically, in the utility model embodiment, the cross section shape of the shaped connecting structure is one of the shape of non-circular curve, the shape of straight line, the shape of arc line and the shape of curve and straight line. Specifically, in the utility model embodiment, the cross section shape of the shaped connecting structure is one of rectangle, square, drum shape and hat shape.

[0052] Wherein, the shaped connecting structure integrates the positioning and torque transmission functions, eliminates the relative rotation caused by the inconsistency between the spline backlash and the positioning surface gap, avoids abnormal sound and component damage.

[0053] In the embodiment, the gear structure 4 and the output shaft 301 are connected through a non-circular cross section, such as a rectangle, a square, a drum shape, a hat shape and the like, and have the positioning and torque transmission functions. The shaped connecting structure integrates the positioning and torque transmission functions, eliminates the relative rotation caused by the inconsistency between the spline backlash and the positioning surface gap, avoids abnormal sound and component damage. That is, the utility model scheme adopts the setting of the shaped connecting structure, realizes the connection of the gear structure 4 and the output shaft 301 through the shaped connecting structure, cancels the spline structure, and avoids the gear shaking and wear caused by the spline backlash. Wherein, the face sleeve connection structure is adopted in the connection section of the reduction motor and the gear structure 4, the connection and cooperation area is the positioning part and the torque transmission part, and there is no inconsistency between the positioning surface and the torque transmission spline section in the prior art. The relative rotation of the pinion gear on the reduction motor shaft causes the abnormal sound or the damage of the gear or the reduction motor shaft and other components when the slewing mechanism drives the crane slewing, improves the transmission stability of the crane during operation, and significantly improves the safety and reliability of the whole machine.

[0054] Specifically, in the utility model embodiment, the output shaft 301 is provided with a shaft shoulder structure 3011 for positioning the gear structure 4;The end 3012 of the output shaft 301 is detachably provided with an axle end baffle 3013;The gear structure 4 is arranged on the output shaft 301 through the cooperation of the axle end baffle 3013 and the shaft shoulder structure 3011.

[0055] Specifically, in the utility model embodiment, there is a gap between the upper end surface of the gear structure 4 and the shaft shoulder structure 3011;Or

[0056] The lower end surface of the gear structure 4 and the shaft end baffle 3013 have a gap.

[0057] Specifically, in the embodiment of the utility model, the distance from the shaft shoulder structure 3011 to the end portion 3012 of the output shaft 301 is B, the thickness of the gear structure 4 is A, A < B; B-A = L, and the L is 0.1-0.5mm.

[0058] In the embodiment, the shaft shoulder structure cooperates with the shaft end baffle, the output shaft is provided with the shaft shoulder structure and the detachable shaft end baffle, the axial fixing structure is formed, the difference L between the distance B from the shaft shoulder structure to the shaft end baffle and the thickness A of the gear structure is 0.1-0.5mm, the proper small gap is ensured after the gear structure is installed, the bolt pre-tightening force of the shaft end baffle is avoided from being transmitted to the gear end surface, and the additional friction and wear are reduced.

[0059] Specifically, in the embodiment of the utility model, the end portion 3012 is provided with a backing plate structure 3014, and the backing plate structure 3014 is located between the end portion 3012 and the shaft end baffle 3013.

[0060] Specifically, in the embodiment of the utility model, the outer dimension diameter of the backing plate structure 3014 is less than or equal to the hole diameter of the gear structure 4.

[0061] Specifically, in the embodiment of the utility model, the backing plate structure 3014 is a plastic backing plate.

[0062] The backing plate structure 3014 of the embodiment of the utility model is used for isolating the gear structure 4 from the shaft end baffle 3013, avoiding the contact between the gear structure and the shaft end baffle, and avoiding the additional wear.

[0063] Meanwhile, the backing plate structure can disperse the axial pressure, reduce the local stress concentration of the gear end surface and the shaft shoulder and the baffle, and prolong the service life of the components.

[0064] Further, the backing plate structure is a backing plate structure of rubber material.

[0065] Specifically, in the embodiment of the utility model, the shaft end baffle 3013 is detachably arranged on the end portion 3012 through the fastener 3015.

[0066] Specifically, in the embodiment of the utility model, the bottom of the crane turret 2 is installed on the crane slewing bearing structure 1 through the bearing structure 5;

[0067] The upper turret panel 202 and the lower turret panel 203 are relatively and parallel arranged on the turret structure 201 of the crane turret 2;

[0068] The motor mounting hole 204 is provided with an upper mounting ring 205 at the motor mounting hole 204 of the upper turntable panel 202.

[0069] The motor mounting hole 204 is provided with an upper mounting ring 205 at the motor mounting hole 204 of the upper turntable panel 202.

[0070] The motor mounting hole 204 is provided with an upper mounting ring 205 at the motor mounting hole 204 of the upper turntable panel 202.

[0071] The motor mounting hole 204 is provided with an upper mounting ring 205 at the motor mounting hole 204 of the upper turntable panel 202.

[0072] More specifically, the slewing mechanism of the portal crane mainly consists of a reduction motor assembly, a brake device, a gear structure arranged at the shaft end of the reduction motor, and a slewing bearing in meshing transmission with the gear structure. The reduction motor assembly is arranged in the upper and lower mounting rings and is installed on the upper and lower panels of the turntable structure through the upper and lower mounting rings. Due to the large size of the turntable structure, it is difficult to machine the installation area of the reduction motor assembly, and the upper and lower mounting rings are usually field-welded to the upper and lower panels of the turntable structure after field adjustment to realize the installation of the reduction motor assembly. The shaft end of the reduction motor assembly and the gear structure are connected by internal and external splines. Upper and lower positioning surfaces are arranged at both ends of the spline hole of the gear structure to match the shaft segment of the reduction motor. When the gear structure is installed, the internal spline hole is sleeved on the shaft segment of the reduction motor, and the upper and lower positioning surfaces of the gear structure match the upper and lower positioning surfaces of the shaft segment of the reduction motor. The shaft end surface of the reduction motor is fixed on the shaft of the reduction motor by the shaft end baffle and the bolt. The main problem of the current structure is that there is a backlash at the joint of the external spline of the shaft of the reduction motor and the internal spline of the gear structure, and the backlash is inconsistent with the gap between the upper and lower positioning surfaces of the shaft of the reduction motor and the gear structure. When the reduction motor needs to drive the slewing work of the crane, the gear structure rotates on the shaft segment of the reduction motor due to the backlash at the spline joint, which increases the wear of the spline tooth surface and the positioning surface. At the same time, if the bolt at the shaft end baffle is tightened too tightly, the ends of the gear structure will be subjected to the tightening force from the bolt, which will cause abnormal noise during the slewing work of the slewing mechanism, and will easily cause damage to the shaft of the reduction motor and the gear structure, affecting the normal and reliable work of the crane.

[0073] Based on this, the portal crane slewing mechanism related to the embodiments of the present application is aimed at the deficiency of the structure form of the connection between the reduction motor and the gear structure in the existing portal crane slewing mechanism, provides a kind of slewing mechanism, the connection between the reduction motor and the gear structure is not positioned and driven by two feature structures and gap inconsistency, and the bolt tightening force at the shaft end baffle has no influence on the structure form when the slewing mechanism drives crane slewing work.The slewing mechanism described in the utility model mainly comprises: reduction motor assembly, brake device, gear structure arranged at the shaft end of reduction motor and slewing bearing engaged with gear structure transmission.Wherein, the shaft shoulder structure is arranged at the axial limiting position of reduction motor shaft and gear structure, for the installation limiting of gear structure at the shaft end of reduction motor shaft, and the connection section of reduction motor shaft and gear structure adopts polygonal structure with the cross section being curve, straight line, arc, curve and straight line and arc arbitrary combination except standard circle, preferably rectangular, square, drum-shaped, hat-shaped, to reliably transmit the driving force of reduction motor to gear structure, to drive slewing bearing, realize the slewing work of crane.The shaft end baffle of reduction motor adopts convex structure, the end structure of reduction motor shaft end exceeds gear structure, and the gasket structure is arranged at the intersection area of shaft end baffle and the end of reduction motor shaft, so that after the installation of gear structure on the shaft section of reduction motor, the thickness A of gear structure in axial direction is less than the distance B between the surface of shaft shoulder structure on the shaft section of reduction motor and the surface of shaft end baffle, and the distance difference L is in the range of 0.1-0.5MM, to prevent the bolt pre-tightening force from causing additional friction force between gear end surface and shaft shoulder structure of reduction motor shaft section through end shaft baffle when the shaft end baffle is installed, and the relative rotation between gear structure and shaft shoulder structure or the relative rotation between shaft end baffle and gear structure occurs when the gear structure slews under the driving of reduction motor, to affect the normal and reliable work of crane.

[0074] In summary, the connection section of reduction motor and gear structure related to the embodiments of the present application adopts surface sleeve structure, the connection matching area is both positioning part and torque transmission part, there is no gap inconsistency caused by the separation of positioning surface and torque transmission spline section in prior art, the relative rotation of gear structure on reduction motor shaft causes abnormal sound or damage of gear or reduction motor shaft and other components when the slewing mechanism drives crane slewing, to affect the normal, safe and reliable work of the whole machine.The shaft end baffle of reduction motor is not in contact with gear structure, to avoid the additional friction force of gear structure end caused by bolt pre-tightening force when the shaft end baffle is installed, to affect the normal, safe and reliable work of the whole machine.

[0075] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A slewing mechanism for a portal crane, characterized in that Comprising: a crane slewing bearing structure (1); a crane turret (2) arranged on the crane slewing bearing structure (1); a reduction motor assembly (3) arranged on the crane turret (2); a gear structure (4) arranged on an output shaft (301) of the reduction motor assembly (3); the gear structure (4) is engaged with a slewing ring gear (101) of the crane slewing bearing structure (1); the gear structure (4) is connected with the output shaft (301) through a shaped connection structure.

2. The slewing mechanism of the portal crane according to claim 1, wherein a cross-sectional shape of the shaped connection structure is a non-circular shape.

3. The slewing mechanism of the portal crane according to claim 1, wherein a cross-sectional shape of the shaped connection structure is one of a shape constituted by a non-circular curve, a shape constituted by a straight line, a shape constituted by an arc, and a shape constituted by a curve and a straight line.

4. The slewing mechanism of the portal crane according to claim 1, wherein a cross-sectional shape of the shaped connection structure is one of a rectangular shape, a square shape, a drum shape, and a hat shape.

5. The slewing mechanism of the portal crane according to any one of claims 1 to 4, wherein an axial shoulder structure (3011) for positioning the gear structure (4) is arranged on the output shaft (301); an end portion (3012) of the output shaft (301) is detachably provided with an axial end baffle (3013); the gear structure (4) is arranged on the output shaft (301) through cooperation of the axial end baffle (3013) and the axial shoulder structure (3011).

6. The slewing mechanism of the portal crane according to claim 5, wherein a gap exists between an upper end surface of the gear structure (4) and the axial shoulder structure (3011); or a gap exists between a lower end surface of the gear structure (4) and the axial end baffle (3013).

7. The slewing mechanism of the portal crane according to claim 6, wherein a distance from the axial shoulder structure (3011) to an end portion (3012) of the output shaft (301) is B, a thickness of the gear structure (4) is A, A < B; B-A = L, and the L is 0.1-0.5 mm; 8. The portal crane slewing mechanism according to claim 6, characterized in that a pad structure (3014) is arranged on the end portion (3012), and the pad structure (3014) is located between the end portion (3012) and the axial end baffle (3013); 9. The portal crane slewing mechanism according to claim 8, characterized in that an outer dimension diameter of the pad structure (3014) is less than or equal to a hole diameter of the gear structure (4); 10. The portal crane slewing mechanism according to claim 9, characterized in that the pad structure (3014) is a pad of plastic material.

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