A stable slewing device for tower crane

Abstract

The present invention belongs to the technical field of tower cranes and discloses a stable slewing device for a tower crane. The stable slewing device for a tower crane comprises a slewing base and a slewing platform. A slewing bearing is mounted on the upper surface of the slewing base. A slewing motor is mounted on one side of the slewing platform, and the driving teeth on the slewing motor mesh with the outer teeth of the slewing bearing for driving the rotation of the device. A positioning ring is fixedly mounted on the lower side of the slewing platform, and the positioning ring is sleeved on the inner ring of the slewing bearing. A central shaft is fixedly connected to the bottom of the slewing platform, and the central shaft is connected to the positioning ring via a linkage mechanism. The stable slewing device for a tower crane, through the design of a linkage mechanism and a stabilizing mechanism, utilizes a movable support structure to absorb the shaking of the slewing device during operation, maintains the stability of its rotation axis, can absorb the shaking of the central shaft using a stabilizing airbag, and provides support for the central shaft by transferring the impact through a stabilizing top plate.

Description

Technical Field

[0001] The present invention relates to the technical field of tower cranes, in particular to a stable slewing device of a tower crane. Background Art

[0002] Tower crane, also known as tower crane, originated in Western Europe. It is a rotating crane with a boom installed on the top of a tall tower. It has a large working space and is mainly used for vertical and horizontal transportation of materials and installation of building components in house construction. It consists of three parts: metal structure, working mechanism and electrical system. The metal structure includes the tower body, boom and base. The working mechanism has four parts: lifting, luffing, rotation and travel. The electrical system includes motors, controllers, distribution cabinets, connecting lines, signals and lighting devices.

[0003] According to the difference in slewing mechanism, tower cranes can be divided into upper slewing tower cranes and lower slewing tower cranes. The upper slewing tower crane has the slewing support, counterweight and main mechanisms all set at the upper end. Its advantage is that since the tower body does not rotate, the lower structure of the tower body can be simplified and jacking and sectioning are convenient. Its disadvantages are: high gravity, high center of gravity, increased wind pressure, and increased pressure weight. Therefore, its stability is greatly tested during operation. To solve this problem, we have proposed a stable slewing device for tower cranes. Summary of the Invention

[0004] The object of the present invention is to provide a stable slewing device for a tower crane. The stable slewing device for a tower crane utilizes a movable supporting structure to absorb the shaking of the slewing device during operation, maintain the stability of its rotation axis, and solve the problems raised in the background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a stable slewing device for a tower crane, comprising a slewing base and a slewing table, wherein a slewing bearing is installed on the upper surface of the slewing base, a slewing motor is installed on one side of the slewing table, and the driving teeth on the slewing motor mesh with the outer teeth of the slewing bearing for slewing drive of the device, a positioning ring is fixedly installed on the lower side of the slewing table, the positioning ring is sleeved on the inner ring of the slewing bearing, a central shaft is fixedly connected to the bottom of the slewing table, the central shaft is connected to the positioning ring through a linkage mechanism, the bottom end of the central shaft extends into the slewing base and is installed and fixed by a stabilization mechanism;

[0006] The stabilization mechanism includes a bearing seat, a base column, a plane bearing, a connecting shaft, a connecting groove, a shock-absorbing ring, a connecting notch, a connecting piece, a spring groove, a stabilization spring and a stabilization component a. The bearing seat is installed on the inner bottom wall of the rotating base, and the base column is installed on the bearing seat through a plane bearing. The connecting groove is provided on the upper surface of the base column, and the connecting shaft is fixedly connected to the bottom end of the center shaft and extends into the connecting groove. The shock-absorbing ring is bonded to the side wall of the connecting groove. A number of connecting notches are provided on the inner wall of the shock-absorbing ring. Connecting pieces are fixedly connected to the positions corresponding to the connecting notches on the connecting shaft, and the connecting pieces are inserted into the connecting notches. Spring grooves are provided at corresponding positions on the upper surface of the base column and the bottom of the center shaft, and stabilization springs are clamped in the corresponding spring grooves. The stabilization component a is arranged in the rotating base and is located outside the center shaft.

[0007] Preferably, the linkage mechanism includes a connecting ring, a movable ring, an elastic connecting strip, a hydraulic groove and a piston. The connecting ring is fixedly mounted on the inner wall of the positioning ring. The movable ring is movably connected to the central axis through an oil-free bearing. The outer wall of the movable ring is hinged with several elastic connecting strips. The hydraulic groove is opened on the inner wall of the connecting ring. The end of the elastic connecting strip away from the movable ring is inserted into the corresponding hydraulic groove and is provided with a piston.

[0008] Preferably, the stabilization component a includes a stabilizing airbag a, a limiting ring a, a shock-absorbing spring a, a trigger rod a, a movable plate a, a weight sensor a, a pressure plate a, a pressure ring a, a guide tube a, a movable rod a, a piston a and a stabilizing top plate a. The limiting ring a is fixedly connected to the inner bottom wall of the swivel base and is coaxial with the central axis. Several stabilizing airbags a are arranged between the limiting ring a and the inner side wall of the swivel base. The shock-absorbing spring a is arranged in the stabilizing airbag a and fits with its inner wall. The weight sensor a is installed on the inner bottom wall of the stabilizing airbag a. The top end of the trigger rod a is fixedly connected to the inner top wall of the stabilizing airbag a. The bottom end of the trigger rod a fits with the weight sensor a. The movable plate a is fixedly connected to the trigger rod a, and the lower surface of the movable plate a contacts the top end of the shock-absorbing spring a. The pressure plate a is fixedly connected to the outer wall of the central axis. Ring a is fixedly connected to the lower surface of pressure plate a and contacts with the top of stabilizing airbag a. One end of several guide tubes a passes through the limiting ring a and is connected to the inside of stabilizing airbag a. The other end of guide tube a points to the central axis. Movable rod a is in guide tube a and one end thereof extends out of guide tube a and is fixedly connected to stabilizing top plate a. Stabilizing top plate a contacts with the central axis. The other end of movable rod a is fixedly installed with piston 2 a. In actual operation, each stabilizing airbag a needs to be connected to an external air pump, and the stabilizing airbag a is equipped with pressure detection equipment and solenoid valve for deflation operation, which is a well-known technology and will not be elaborated herein. A gravity sensor is used to detect the pressure of trigger rod a. The gravity value can be preset according to the actual working conditions of the tower crane. When the pressure on the trigger rod a caused by the shaking of the turntable exceeds the preset value, the air pump can actively inflate the corresponding stabilizing airbag a to provide support and offset the force causing the shaking.

[0009] Preferably, the guide tubes a are arranged vertically in groups of three, and each group of guide tubes a corresponds to a stabilizing top plate a.

[0010] Preferably, a wear-resistant plate is embedded at the position where the top of the stabilizing airbag a contacts the pressure ring a. The wear-resistant plate is a self-lubricating plate, which can reduce the wear on the pressure ring a. Brake pads are installed on the upper surface of the stabilizing airbag a and on the inner and outer sides of the wear-resistant plate. The cross-section of the pressure ring a is an inverted isosceles trapezoid. When the turntable needs to brake, each stabilizing airbag a can be inflated at the same time so that the stabilizing airbag a protrudes upward and the brake pad fits the surface of the pressure ring a to brake.

[0011] Preferably, the number of groups of the guide tubes a is not less than eight, and the eight groups of guide tubes a are arranged in a ring shape with the axis of the central axis as a reference.

[0012] Preferably, the number of the elastic connecting strips is not less than eighteen and they are evenly distributed on the outer wall of the movable ring, and hydraulic oil is filled between the piston 1 and the bottom wall of the hydraulic groove.

[0013] In a stable state, each elastic connecting strip can form a stable support for the central axis and allow the central axis to have a small range of movement space.

[0014] By adopting the above technical solution, the beneficial effects of the present invention are:

[0015] The stable slewing device of the tower crane, through the design of the linkage mechanism and the stabilization mechanism, uses a movable support structure to absorb the shaking of the slewing device during operation, maintain the stability of its rotation axis, and can use the stabilization airbag to absorb the shaking of the central axis and provide support to the central axis by transferring the impact through the stabilization top plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 A top view of the present invention;

[0018] Figure 3 For the present invention Figure 2 Middle AA cross-section;

[0019] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0020] Figure 5 For the present invention Figure 3 Enlarged view of point B in the middle;

[0021] Figure 6 For the present invention Figure 3 Enlarged view of point C in the middle.

[0022] In the figure: 1 slewing base, 2 slewing table, 3 slewing bearing, 4 slewing motor, 5 positioning ring, 6 center axis,

[0023] 7 linkage mechanism, 71 connecting ring, 72 movable ring, 73 elastic connecting strip, 74 hydraulic groove, 75 piston 1,

[0024] 8 stabilizing mechanism, 82 bearing seat, 83 bottom column, 84 plane bearing, 85 connecting shaft, 86 connecting groove, 87 cushioning ring, 88 connecting notch, 89 connecting piece, 810 spring groove, 811 stabilizing spring, a stabilizing component,

[0025] a1 stabilizing airbag, a2 limiting ring, a3 cushioning spring, a4 trigger rod, a5 movable plate, a6 weight sensor, a7 pressure plate, a8 pressure ring, a9 guide tube, a10 movable rod, a11 piston 2, a12 stabilizing top plate,

[0026] 9 wear-resistant pads, 10 brake pads. DETAILED DESCRIPTION

[0027] See also Figure 1-6 The present invention provides a technical solution: a stable slewing device for a tower crane, comprising a slewing base 1 and a slewing platform 2. A slewing bearing 3 is installed on the upper surface of the slewing base 1. A slewing motor 4 is installed on one side of the slewing platform 2, and the driving teeth on the slewing motor 4 mesh with the outer teeth of the slewing bearing 3 for slewing drive of the device. A positioning ring 5 is fixedly installed on the lower side of the slewing platform 2, and the positioning ring 5 is sleeved on the inner ring of the slewing bearing 3. A central shaft 6 is fixedly connected to the bottom of the slewing platform 2, and the central shaft 6 is connected to the positioning ring 5 through a linkage mechanism 7. The bottom end of the central shaft 6 extends into the slewing base 1 and is installed and fixed by a stabilization mechanism 8.

[0028] The stabilizing mechanism 8 includes a bearing seat 82, a bottom column 83, a plane bearing 84, a connecting shaft 85, a connecting groove 86, a shock-absorbing ring 87, a connecting notch 88, a connecting piece 89, a spring groove 810, a stabilizing spring 811 and a stabilizing component a. The bearing seat 82 is mounted on the inner bottom wall of the rotary base 1, the bottom column 83 is mounted on the bearing seat 82 through the plane bearing 84, the connecting groove 86 is opened on the upper surface of the bottom column 83, and the connecting shaft 85 is fixedly connected to the bottom end of the central axis 6 and extends into the connecting groove 86. The shock-absorbing ring 87 is bonded to the side wall of the connecting groove 86, and a number of connecting notches 88 are provided on the inner wall of the shock-absorbing ring 87. A connecting piece 89 is fixedly connected to the position corresponding to the connecting notch 88 on the connecting shaft 85, and the connecting piece 89 is inserted into the connecting notch 88. Spring grooves 810 are provided at the corresponding positions on the upper surface of the base column 83 and the bottom of the central axis 6. A stabilizing spring 811 is clamped in the corresponding spring groove 810. The stabilizing component a is arranged in the slewing base 1 and is located outside the central axis 6.

[0029] The inner wall of the shock absorbing ring 87 contacts the connecting shaft 85 , and there is a gap between the connecting piece 89 and the bottom wall of the connecting notch 88 , so that the connecting shaft 85 has room to move.

[0030] The linkage mechanism 7 includes a connecting ring 71, a movable ring 72, an elastic connecting strip 73, a hydraulic groove 74 and a piston 75. The connecting ring 71 is fixedly mounted on the inner wall of the positioning ring 5. The movable ring 72 is movably connected to the central shaft 6 through an oil-free bearing. The outer wall of the movable ring 72 is hinged with a plurality of elastic connecting strips 73. The hydraulic groove 74 is provided on the inner wall of the connecting ring 71. The end of the elastic connecting strip 73 away from the movable ring 72 is inserted into the corresponding hydraulic groove 74 and is provided with a piston 75.

[0031] The stabilization component a includes a stabilizing airbag a1, a limiting ring a2, a shock-absorbing spring a3, a trigger rod a4, a movable plate a5, a weight sensor a6, a pressure plate a7, a pressure ring a8, a guide tube a9, a movable rod a10, a piston 2 a11 and a stabilizing top plate a12. The limiting ring a2 is fixedly connected to the inner bottom wall of the slewing base 1 and is coaxial with the central axis 6. Several stabilizing airbags a1 are arranged between the limiting ring a2 and the inner side wall of the slewing base 1. The shock-absorbing spring a3 is arranged in the stabilizing airbag a1 and fits with its inner wall. The weight sensor a6 is installed on the inner bottom wall of the stabilizing airbag a1. The top end of the trigger rod a4 is fixedly connected to the inner top wall of the stabilizing airbag a1. The bottom end of the trigger rod a4 fits with the weight sensor a6. The movable plate a5 is fixedly connected to the trigger rod a4, and the lower surface of the movable plate a5 contacts the top end of the shock-absorbing spring a3. The pressure plate a7 is fixedly connected to the outer wall of the central axis 6. The pressure ring a8 is fixed It is connected to the lower surface of the pressure plate a7 and in contact with the top of the stabilizing airbag a1. One end of several guide tubes a9 passes through the limit ring a2 and is connected to the inside of the stabilizing airbag a1. The other end of the guide tube a9 points to the central axis 6. The movable rod a10 is in the guide tube a9 and one end thereof extends out of the guide tube a9 and is fixedly connected to the stabilizing top plate a12. The stabilizing top plate a12 is in contact with the central axis 6. The other end of the movable rod a10 is fixedly installed with a piston a11. In actual operation, each stabilizing airbag a1 requires an external air pump, and the stabilizing airbag a1 is equipped with a pressure detection device and a solenoid valve for deflation operation. This is a well-known technology and will not be elaborated on. A gravity sensor is used to detect the pressure of the trigger rod a4. The gravity value can be preset according to the actual working conditions of the tower crane. When the pressure caused by the shaking of the turntable 2 on the trigger rod a4 exceeds the preset value, the air pump can actively inflate the corresponding stabilizing airbag a1 to provide support to offset the force causing the shaking.

[0032] The guide tubes a9 are arranged vertically in groups of three, and each group of guide tubes a9 corresponds to a stabilizing top plate a12.

[0033] A wear-resistant plate 9 is embedded in the position where the top of the stabilizing airbag a1 contacts the pressure ring a8. The wear-resistant plate 9 is a self-lubricating plate, which can reduce the wear of the pressure ring a8. Brake pads 10 are installed on the upper surface of the stabilizing airbag a1 and on the inner and outer sides of the wear-resistant plate 9. The cross-section of the pressure ring a8 is an inverted isosceles trapezoid. When the turntable 2 needs to brake, each stabilizing airbag a1 can be inflated at the same time so that the stabilizing airbag a1 protrudes upward so that the brake pads 10 fit the surface of the pressure ring a8 to brake.

[0034] The number of the guide tubes a9 is no less than eight, and the eight guide tubes a9 are arranged in a ring shape with the axis of the central axis 6 as a reference.

[0035] The number of elastic connecting strips 73 is no less than eighteen and they are evenly arranged on the outer wall of the movable ring 72. Hydraulic oil is filled between piston 1 75 and the bottom wall of the hydraulic groove 74. The hydraulic oil is used to maintain the position of the elastic connecting strip 73 in the hydraulic groove 74, providing stable support for the central axis 6. When the central axis 6 shakes, it can cooperate with the stabilizing mechanism 8 to quickly reset the central axis 6. A level sensor is installed on the turntable 2 to detect the balance state of the turntable 2 in real time, and dynamically adjust the turntable 2 to make it level through the stabilizing mechanism 8.

[0036] In a stable state, each elastic connecting strip 73 can provide stable support for the central shaft 6 and allow the central shaft 6 to have a small range of movement space.

[0037] Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A stable slewing device for a tower crane, comprising a slewing base (1) and a slewing platform (2), wherein a slewing bearing (3) is mounted on the upper surface of the slewing base (1), a slewing motor (4) is mounted on one side of the slewing platform (2), and active teeth on the slewing motor (4) mesh with external teeth of the slewing bearing (3), characterized in that: The inner ring of the slewing bearing (3) is fixedly sleeved with a positioning ring (5), the bottom of the slewing table (2) is fixedly connected with a central shaft (6), the central shaft (6) is connected to the positioning ring (5) through a linkage mechanism (7), and the bottom end of the central shaft (6) extends into the slewing base (1) and is installed and fixed through a stabilization mechanism (8); The stabilizing mechanism (8) includes a bearing seat (82), a bottom column (83), a plane bearing (84), a connecting shaft (85), a connecting groove (86), a shock-absorbing ring (87), a connecting notch (88), a connecting piece (89), a spring groove (810), a stabilizing spring (811) and a stabilizing component (a), wherein the bearing seat (82) is mounted on the inner bottom wall of the rotary base (1), the bottom column (83) is mounted on the bearing seat (82) through the plane bearing (84), the connecting groove (86) is provided on the upper surface of the bottom column (83), and the connecting shaft (85) is fixedly connected to the bottom end of the central shaft (6) and extends to In the connecting groove (86), the shock absorbing ring (87) is bonded to the side wall of the connecting groove (86), and the inner wall of the shock absorbing ring (87) is provided with a plurality of connecting notches (88), and a connecting piece (89) is fixedly connected to the position corresponding to the connecting notch (88) on the connecting shaft (85), and the connecting piece (89) is inserted into the connecting notch (88), and spring grooves (810) are provided at corresponding positions on the upper surface of the bottom column (83) and the bottom of the central shaft (6), and a stabilizing spring (811) is clamped in the corresponding spring groove (810), and the stabilizing component (a) is arranged in the rotary base (1) and is located outside the central shaft (6); The linkage mechanism (7) includes a connecting ring (71), a movable ring (72), an elastic connecting strip (73), a hydraulic groove (74) and a piston (75). The connecting ring (71) is fixedly mounted on the inner wall of the positioning ring (5). The movable ring (72) is movably connected to the central shaft (6) through an oil-free bearing. The outer wall of the movable ring (72) is hinged with a plurality of elastic connecting strips (73). The hydraulic groove (74) is opened on the inner wall of the connecting ring (71). One end of the elastic connecting strip (73) away from the movable ring (72) is inserted into the corresponding hydraulic groove (74) and is provided with a piston (75).

2. The stable slewing device of a tower crane according to claim 1, characterized in that: The stabilization component (a) includes a stabilization airbag (a1), a limiting ring (a2), a shock absorbing spring (a3), a trigger rod (a4), a movable plate (a5), a weight sensor (a6), a pressure plate (a7), a pressure ring (a8), a guide tube (a9), a movable rod (a10), a second piston (a11) and a stabilization top plate (a12), wherein the limiting ring (a2) is fixedly connected to the inner bottom wall of the slewing base (1) and is coaxial with the central axis (6), a plurality of the stabilization airbags (a1) are arranged between the limiting ring (a2) and the inner side wall of the slewing base (1), the shock absorbing spring (a3) ​​is arranged in the stabilization airbag (a1) and is in contact with the inner wall thereof, the weight sensor (a6) is installed on the inner bottom wall of the stabilization airbag (a1), the top end of the trigger rod (a4) is fixedly connected to the inner top wall of the stabilization airbag (a1), and the trigger rod (a4) is fixedly connected to the inner top wall of the stabilization airbag (a1). The bottom end of (a4) is fitted with the weight sensor (a6), the movable plate (a5) is fixedly connected to the trigger rod (a4), and the lower surface of the movable plate (a5) contacts the top of the shock-absorbing spring (a3), the pressure plate (a7) is fixedly connected to the outer wall of the central axis (6), the pressure ring (a8) is fixedly connected to the lower surface of the pressure plate (a7) and contacts the top of the stabilizing airbag (a1), one end of a plurality of guide tubes (a9) passes through the limiting ring (a2) and is connected to the stabilizing airbag (a1), the other end of the guide tube (a9) points to the central axis (6), the movable rod (a10) is in the guide tube (a9) and one end thereof extends out of the guide tube (a9) and is fixedly connected to the stabilizing top plate (a12), the stabilizing top plate (a12) contacts the central axis (6), and the other end of the movable rod (a10) is fixedly installed with piston 2 (a11).

3. The stable slewing device of a tower crane according to claim 2, characterized in that: The guide tubes (a9) are arranged vertically in a group of three, and each group of guide tubes (a9) corresponds to a stabilizing top plate (a12).

4. The stable slewing device of a tower crane according to claim 3, characterized in that: A wear-resistant plate (9) is embedded at the position where the top of the stabilizing airbag (a1) contacts the pressure ring (a8), and brake pads (10) are installed on the upper surface of the stabilizing airbag (a1) and on the inner and outer sides of the wear-resistant plate (9). The cross-section of the pressure ring (a8) is an inverted isosceles trapezoid.

5. The stable slewing device of a tower crane according to claim 4, characterized in that: The number of groups of the guide tubes (a9) is no less than eight, and the eight groups of guide tubes (a9) are arranged in a ring shape with the axis of the central axis (6) as a reference.

6. The stable slewing device of a tower crane according to claim 5, characterized in that: The number of the elastic connecting strips (73) is not less than eighteen and they are evenly distributed on the outer wall of the movable ring (72), and the space between the piston 1 (75) and the bottom wall of the hydraulic groove (74) is filled with hydraulic oil.

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