Turbine worm slewing mechanism and crane

Abstract

The invention belongs to the technical field of cranes, and particularly relates to a turbine worm slewing mechanism and a crane. An outer ring of a turbine slewing bearing is fixedly connected to a frame, an inner ring of the turbine slewing bearing is connected with a rotary table, a worm is rotationally connected with the rotary table and meshed with the outer ring of the turbine slewing bearing, a power mechanism is arranged on the rotary table and connected with the worm, and the free sliding and rotating assembly is further included. A worm and a worm gear slewing bearing are matched with a motor for driving, so that the rotary table can be locked at any position, the structural micro-motion performance is good, and rotary shaking and start-stop impact are effectively improved; the worm and worm gear slewing bearing combination is large in transmission ratio, a speed reducer does not need to be arranged, and the structure is more compact and light; through the arrangement of the free sliding and rotating assembly, the driving piece drives the worm to move in parallel, the worm can be disengaged from the outer ring of the worm gear slewing bearing, self-locking is eliminated, free sliding and rotating of the rotary table are achieved, and unbalance loading is prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of cranes, and in particular relates to a turbine worm gear slewing mechanism and a crane. Background Art

[0002] When the crane is in operation, the boom lifts the heavy objects, and then the turntable is rotated to change the position of the heavy objects to meet the actual engineering needs. The crane slewing system includes a slewing support and a slewing drive device. The outer ring of the slewing support is connected to the chassis and remains fixed. The inner ring is connected to the turntable. The drive gear rotates and meshes with the outer ring gear of the slewing support, so that the turntable and the drive gear revolve around the outer ring of the slewing support, and the turntable rotates within 360 degrees relative to the chassis. The slewing drive device provides rotational power for the drive gear.

[0003] The slewing mechanism of a traditional crane generally adopts a structure in which spur gears mesh with each other, that is, spur gear drive gears and slewing bearings, and uses a hydraulic system as a power source, that is, a hydraulic oil pump drives a hydraulic motor to drive the drive gear. The meshing overlap of the gears of this slewing mechanism is small, and the hydraulic drive causes vibration during the slewing process, unstable operation, and large left and right shaking when the slewing stops, which can easily lead to problems such as the slewing not being able to lock when the frame is tilted or diagonally pulled. Summary of the invention

[0004] In view of the above problems existing in the prior art, the present invention provides a turbine worm gear slewing mechanism and a crane, which can solve the problems of unstable operation and large shaking when the rotation stops.

[0005] To achieve the above object, the technical solution provided by the present invention is as follows:

[0006] In the first aspect, the present application provides a turbine worm rotating mechanism, comprising a turntable, a turbine slewing bearing, a worm and a power mechanism, wherein the outer ring of the turbine slewing bearing is fixedly connected to a frame, the inner ring of the turbine slewing bearing is connected to the turntable, the worm is rotatably connected to the turntable, the worm is meshed with the outer ring of the turbine slewing bearing, and the power mechanism is arranged on the turntable, and the power mechanism is connected to the worm.

[0007] Optionally, it also includes a fixed seat, which is arranged on the turntable. One end of the worm is connected to the fixed seat, and the other end is connected to the output end of the power mechanism.

[0008] Optionally, it also includes a free sliding component, which includes a driving member, and the driving member is arranged on a turntable. The driving member is arranged on the side of the fixed seat away from the worm, and a connecting shaft is slidingly connected on the fixed seat, and the worm is connected to the connecting shaft. The driving member is used to drive the connecting shaft to slide, and a fixing member for fixing the connecting shaft is provided on the fixed seat; the power mechanism and the worm are connected by a rotation and translation component, and the rotation and translation component is used to drive the worm to rotate and axially translate with the power mechanism.

[0009] Optionally, the rotation-translation assembly includes a spline, and the power mechanism is connected to the worm through a spline structure.

[0010] Optionally, the driving member includes a clutch, which is fixedly connected to the turntable and connected to the connecting shaft via a telescopic assembly.

[0011] Optionally, a bearing is provided between the connecting shaft and the worm.

[0012] Optionally, the fixing member includes a screw rod, and screw holes are provided on the fixing seat and the connecting shaft. The screw rod passes through the fixing seat and is threadedly connected to the connecting shaft.

[0013] Optionally, a telescopic cylinder is also provided on the turntable, and a worm positioning device is provided on the telescopic cylinder. The worm positioning device includes a claw, and the telescopic end of the telescopic cylinder is connected to the claw. A universal ball is correspondingly provided on the worm, and the claw is clamped with the worm through the universal ball.

[0014] Optionally, it also includes a controller, a rotary encoder and a proximity switch, wherein the proximity switch is arranged on the connecting shaft to detect the moving distance of the connecting shaft; the rotary encoder is arranged on the motor to detect the rotation angle of the worm; the proximity switch and the rotary encoder are both connected to the signal input end of the controller; the signal output end of the controller is connected to the driving member and the power mechanism.

[0015] In a second aspect, the present application also provides a crane, comprising the above-mentioned turbine worm gear slewing mechanism.

[0016] Compared with the prior art, this application has at least the following beneficial effects:

[0017] 1. The present invention drives the turntable to rotate through the structure of the worm and turbine slewing bearing. The worm has continuous spiral teeth, and the meshing with the turbine teeth of the slewing bearing is continuous. The teeth of the worm do not enter and exit the meshing process, so the operation is stable, and the unstable rotation, shaking and rotation noise of the crane are effectively reduced;

[0018] Second, the worm gear mechanism is self-locking and can achieve reverse self-locking, that is, only the worm gear can drive the worm wheel, but the worm wheel cannot drive the worm gear. This allows the crane to be mechanically locked at any position of 360°, solving the problem of the slewing being unable to be locked when the frame is tilted or diagonally pulled;

[0019] 3. The worm and worm gear slewing bearing is matched with the motor drive, and the structure has good micro-motion and speed regulation, which effectively improves the rotation vibration and start-stop impact; and the combined transmission ratio of the worm and worm gear slewing bearing is large, and there is no need to set a reducer, and the structure is more compact and lightweight;

[0020] Fourth, through the setting of the free sliding assembly, the driving part drives the worm to move in parallel, which can disengage the worm from the outer ring of the worm wheel slewing bearing, eliminate self-locking, realize the free sliding of the turntable, and prevent unbalanced loading; the worm can be smoothly returned to the meshing state by limiting the translation of the worm through the screw hole and fixing the worm with the claw. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic structural diagram of a worm gear rotating mechanism according to Embodiment 1 of the present application;

[0023] Figure 2 This is a schematic diagram for illustrating the connection relationship between the worm and the turbine slewing bearing according to Embodiment 1 of the present application;

[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of a worm gear rotating mechanism in Example 2 of the present application;

[0025] Figure 4 This is a schematic diagram for illustrating the structure of a free-sliding assembly in Example 2 of the present application;

[0026] Description of reference numerals:

[0027] 1. Turntable; 11. Mounting plate; 2. Turbine slewing bearing; 21. Inner ring; 22. Outer ring; 3. Worm; 4. Power mechanism; 5. Frame; 7. Fixed seat; 8. Rotary translation assembly; 81. Internal spline shaft; 82. External spline shaft; 83. Clutch; 84. Electric cylinder; 9. Telescopic cylinder; 91. Clamping claw. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use.

[0029] Example 1

[0030] like Figure 1-Figure 2As shown, a turbine worm gear rotating mechanism includes a turntable 1, a turbine slewing bearing 2, a worm 3 and a power mechanism 4, wherein the outer ring 22 of the turbine slewing bearing 2 is fixedly connected to the frame 5 and is fixed relative to the ground, the inner ring 21 of the turbine slewing bearing 2 is connected to the turntable 1, the worm 3 is rotatably connected to the turntable 1, the worm 3 is meshed with the outer ring 22 of the turbine slewing bearing 2, and the power mechanism 4 is arranged on the turntable 1, and the power mechanism 4 is connected to the worm 3.

[0031] The power mechanism 4 provides power to drive the worm 3 to rotate. In this embodiment, the power mechanism 4 adopts a motor, which is meshed with the turbine slewing bearing 2 through the worm 3. When working, the outer ring 22 of the turbine slewing bearing 2 is fixed. Driven by the power mechanism 4, the worm 3 rotates and revolves around the outer ring 22 of the turbine slewing bearing. Since the worm 3 is connected to the turntable 1, the turntable 1 is driven by the worm 3 to rotate. The turbine worm 3 mechanism has self-locking properties and can achieve reverse self-locking, that is, the worm 3 can only drive the worm wheel, but the worm wheel cannot drive the worm 3. Therefore, when the worm 3 stops rotating, the turntable 1 can be stopped at any position, and the crane can be mechanically locked at any position of 360°.

[0032] Example 2

[0033] When lifting heavy objects, the crane often has an overload phenomenon. In order to effectively prevent overload, the crane has a free sliding control function. That is, when the hook and the heavy object are within the same radius, but the heavy object is not directly under the hook, the lifting weight can be automatically aligned. In order to meet the working condition requirements of the free sliding of the crane turntable 1, it is necessary to disengage the worm gear 3 and disconnect the power transmission of the worm gear 3 from the motor to achieve free sliding of the turbine.

[0034] like Figure 3 and Figure 4 As shown, the difference between this embodiment and embodiment 1 is that: it also includes a free sliding component and a fixed seat 7, a mounting plate 11 is provided on the outer peripheral side of the turntable 1, the fixed seat 7 is fixedly connected to the mounting plate 11 on the outer peripheral side of the turntable 1, and a connecting shaft is slidably connected to the fixed seat 7 through a rotating hole, one end of the worm 3 is connected to the connecting shaft, and the other end is connected to the power mechanism 4 through a rotation and translation component 8, and the rotation and translation component 8 is used to drive the worm 3 to rotate and axially translate with the power mechanism 4; the free sliding component includes a driving member, the driving member is provided on the turntable 1, and is located on the side of the fixed seat 7 away from the worm 3, and the driving member is used to drive the connecting shaft to slide along the rotating hole; a fixing member (not shown in the figure) for fixing the connecting shaft is provided on the fixed seat 7, and when the worm 3 does not need to translate, the fixing member fixes the connecting shaft and the fixed seat 7.

[0035] In this embodiment, the rotation and translation assembly 8 includes a spline, an internal spline shaft 81 is provided on the output shaft of the power mechanism 4, and an external spline shaft 82 is provided on the worm 3; the power mechanism 4 is connected to the worm 3 through a spline structure. When the worm 3 needs to rotate, the power mechanism 4 provides power to the worm 3 through the spline. When the worm 3 needs to translate to achieve separation from the turbine slewing bearing 2, the worm 3 can achieve axial movement with the power mechanism 4 through the spline.

[0036] The driving member includes a clutch 83, which is fixedly connected to the bottom surface of the mounting plate of the turntable 1. The clutch 83 is connected to the end of the connecting shaft away from the worm 3 through a telescopic assembly. By operating the clutch 83 to control the telescopic assembly, the worm 3 can be translated along the rotating hole of the fixing seat 7, so that the worm 3 is not in the turbine slewing bearing 2. The telescopic assembly can be any as long as it has a telescopic function, and can be an electric cylinder 84 or the like.

[0037] A bearing (not shown in the figure) is arranged between the connecting shaft and the worm 3 , so that the worm 3 can rotate freely relative to the fixing seat 7 under the drive of the motor.

[0038] The fixing member can be any structure that can fix the connecting shaft and the fixing seat 7, or can be fixed directly by the force applied by the clutch 83. In this embodiment, the fixing member includes a screw rod, and screw holes are provided on the fixing seat 7 and the connecting shaft. The screw rod passes through the fixing seat 7 and is threadedly connected with the side wall of the screw hole on the connecting shaft. When the worm gear is engaged with the turbine slewing bearing 2, the connecting shaft is fixed to the screw rod by the screw rod; when the worm gear 3 is to be separated from the turbine slewing bearing 2, the screw rod is rotated in a direction away from the connecting shaft to release the lock between the fixing seat 7 and the connecting shaft.

[0039] In order to further ensure the stability of the worm 3 after returning to the meshing state, a telescopic cylinder 9 is also provided on the turntable 1. The telescopic cylinder 9 is arranged on the side of the worm 3 away from the turbine slewing bearing 2. The telescopic cylinder 9 is provided with a worm 3 positioning device. The worm 3 positioning device includes a claw 91. The telescopic end of the telescopic cylinder 9 is connected to the claw 91. A universal ball is correspondingly provided on the worm 3. The claw 91 is engaged with the worm 3 through the universal ball, thereby limiting the worm 3 and preventing the worm 3 from translating.

[0040] This embodiment also includes a controller, a rotary encoder and a proximity switch. The proximity switch is arranged on the connecting shaft to detect the moving distance of the connecting shaft; the rotary encoder is arranged on the motor to detect the rotation angle of the worm 3; the proximity switch and the rotary encoder are both connected to the signal input end of the controller; the signal output end of the controller is connected to the drive member and the power mechanism 4.

[0041] The present application also provides a crane, comprising the above-mentioned turbine worm 3 rotating mechanism.

[0042] Implementation principle: When the turntable 1 needs to slide freely, the screw is rotated in the direction away from the connecting shaft to release the lock between the fixed seat 7 and the connecting shaft. The telescopic end of the telescopic cylinder 9 drives the claw 91 away from the worm 3, and the clutch 83 starts the electric cylinder 84 to shorten, driving the worm 3 to move along the rotating hole of the fixed seat 7 away from the turbine slewing bearing 2. The other end of the worm 3 is axially translated with the power mechanism 4 through the spline until the worm 3 is disengaged. The rotary encoder and the proximity switch monitor the movement of the worm 3 and transmit the signal to the controller to control the clutch 83 and the electric cylinder 84 to stop extending and retracting. At this time, the turntable 1 enters the free sliding state.

[0043] When the free-slip state needs to be closed, the controller controls the electric cylinder 84 of the clutch 83 to extend, and the worm 3 moves in the opposite direction. The rotary encoder and the proximity switch detect the rotation angle and the translation distance and transmit the signal to the controller. The controller controls the clutch 83 to stop working, and the worm 3 and the turbine slewing bearing 2 return to the meshing state, and then the worm 3 is limited by the universal ball on the claw and the worm 3, and then the fixed seat 7 and the connecting shaft are locked by the screw. Then the power mechanism 4 is operated to provide power for the worm 3. Through the meshing of the worm 3 and the turbine slewing bearing 2, the worm 3 rotates and revolves around the turbine slewing bearing 2, and then the worm 3 drives the turntable 1 to rotate.

[0044] In the description of this application, it should be noted that, 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 indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0045] The above is only a preferred implementation of the present application. 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 application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A worm gear rotating mechanism, characterized in that: It includes a turntable, a turbine slewing bearing, a worm and a power mechanism. The outer ring of the turbine slewing bearing is fixedly connected to the frame, the inner ring of the turbine slewing bearing is connected to the turntable, the worm is rotatably connected to the turntable, the worm is meshed with the outer ring of the turbine slewing bearing, and the power mechanism is arranged on the turntable, and the power mechanism is connected to the worm.

2. The worm gear rotating mechanism according to claim 1, characterized in that: It also includes a fixed seat, which is arranged on the turntable. One end of the worm is connected to the fixed seat, and the other end is connected to the output end of the power mechanism.

3. The worm gear rotating mechanism according to claim 2, characterized in that: It also includes a free sliding component, which includes a driving member, which is arranged on a turntable, and the driving member is arranged on a side of a fixed seat away from the worm. A connecting shaft is slidingly connected to the fixed seat, and the worm is connected to the connecting shaft. The driving member is used to drive the connecting shaft to slide, and a fixing member for fixing the connecting shaft is provided on the fixed seat; the power mechanism and the worm are connected by a rotation and translation component, and the rotation and translation component is used to drive the worm to rotate and axially translate with the power mechanism.

4. The worm gear rotating mechanism according to claim 3, characterized in that: The rotation and translation assembly comprises a spline, and the power mechanism is connected to the worm through the spline structure.

5. The worm gear rotating mechanism according to claim 3, characterized in that: The driving member comprises a clutch, which is fixedly connected to the turntable and connected to the connecting shaft through a telescopic assembly.

6. The worm gear rotating mechanism according to claim 3, characterized in that: A bearing is arranged between the connecting shaft and the worm.

7. The worm gear rotating mechanism according to claim 3, characterized in that: The fixing member comprises a screw rod, and screw holes are correspondingly arranged on the fixing seat and the connecting shaft. The screw rod passes through the fixing seat and is threadedly connected with the connecting shaft.

8. The worm gear rotating mechanism according to claim 3, characterized in that: A telescopic cylinder is also provided on the turntable, and a worm positioning device is provided on the telescopic cylinder. The worm positioning device includes a claw, and the telescopic end of the telescopic cylinder is connected to the claw. A universal ball is correspondingly provided on the worm, and the claw is connected to the worm through the universal ball.

9. The worm gear rotating mechanism according to claim 3, characterized in that: It also includes a controller, a rotary encoder and a proximity switch. The proximity switch is arranged on the connecting shaft to detect the moving distance of the connecting shaft; the rotary encoder is arranged on the motor to detect the rotation angle of the worm; the proximity switch and the rotary encoder are both connected to the signal input end of the controller; the signal output end of the controller is connected to the driving member and the power mechanism.

10. A crane, characterized in that: It comprises the turbine worm rotating mechanism as described in any one of claims 1 to 9.

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