Steering mechanism for rubber-tired crane

Abstract

The utility model belongs to the field of steering mechanisms, and particularly relates to a steering mechanism for a rubber-tired crane, which comprises a lower cross beam, a motor speed reducer, a slewing bearing and an axle, a mounting plate is fixedly mounted on the lower cross beam, and the motor speed reducer is mounted at the top of the mounting plate through a fastener I; a slewing bearing is installed at the bottom of the installation plate through a detachable structure, the bottom of the slewing bearing is fixedly connected with an axle through a second fastener, an output shaft of the motor speed reducer extends to the position below the installation plate and is provided with a driving gear through a third fastener, the driving gear is matched with the slewing bearing, a rack is arranged on the outer side of the slewing bearing, and the rack is connected with the motor speed reducer through a second fastener. And the driving gear is meshed with the rack. According to the utility model, the design is reasonable, the motor speed reducer connected to the lower cross beam drives the slewing bearing through the driving gear, so that the tire group is driven to steer by 360 degrees, the steering can be free on a bad road surface, the transfer is convenient, and the structure is compact.

Description

Technical Field

[0001] The utility model relates to the technical field of steering mechanisms, in particular to a steering mechanism for a tire crane. Background Art

[0002] There are many scenarios in life where gantry cranes are needed to complete material transfer operations, such as railway transfer stations, factories, etc.

[0003] However, in order to use most cranes, a cement foundation must be laid in advance at the site of use, two parallel crane tracks must be pre-buried, cables must be pre-buried, and the location of the cable trench must be planned. The initial site planning takes a long time and is costly. The crane trolley's travel range is limited, and it is inconvenient to transport the entire machine after use. In addition, the rotation of traditional tire cranes mostly adopts the form of hydraulic cylinders or electric push rods to drive the slewing bearing. This form has high use costs and a large installation space. Single-angle steering can only achieve ±45 degrees and cannot rotate 360 ​​degrees. The entire machine has a large rotation radius and is difficult to operate. Therefore, we propose a steering mechanism for tire cranes to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a steering mechanism for a tire crane.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A steering mechanism for a tire crane comprises a lower crossbeam, a motor reducer, a slewing bearing and an axle. A mounting plate is fixedly mounted on the lower crossbeam, and the motor reducer is mounted on the top of the mounting plate via a fastener.

[0007] The bottom of the mounting plate is installed with a slewing bearing through a detachable structure. The bottom of the slewing bearing is fixedly connected to the axle through a second fastener. The output shaft of the motor reducer extends to the bottom of the mounting plate and is installed with a driving gear through a third fastener. The driving gear is adapted to the slewing bearing.

[0008] Preferably, a rack is provided on the outer side of the slewing bearing, and the driving gear is meshed with the rack.

[0009] Preferably, the second fastener includes a bolt slot, a mounting hole and a fixing bolt. The bolt slot is provided on the bottom of the mounting plate, the mounting hole is provided on the inner ring of the slewing bearing, and a fixing bolt matching the bolt slot is installed in the mounting hole.

[0010] Preferably, the second fastener includes a second fixing bolt, a second mounting hole and a nut. A plurality of second fixing bolts are installed on the outer ring of the slewing bearing, and a plurality of second mounting holes are opened on the axle. The second fixing bolts pass through the corresponding second mounting holes and are threadedly installed with nuts.

[0011] Preferably, an encoder is mounted on the top of the mounting plate, and a connecting shaft is provided at the bottom of the encoder. The connecting shaft passes through the slewing bearing and is connected to the axle.

[0012] Preferably, a thread groove is provided on the top of the axle, an internal thread is provided on the inner wall of the thread groove, an external thread is provided on the outer bottom of the connecting shaft, and the external thread is engaged with the corresponding internal thread.

[0013] Preferably, a tire set is provided on the axle.

[0014] Preferably, the motor in the motor reducer is a universal fully enclosed self-fan cooling or forced cooling three-phase asynchronous motor, and the motor rear cover can be installed with a disc brake with DC coil excitation.

[0015] Beneficial effects of the utility model:

[0016] 1. The motor reducer can drive the driving gear to rotate, and the driving gear drives the slewing bearing to control the steering of the axle, and the axle can steer the tire group.

[0017] 2. The encoder is connected to the axle through the connecting shaft, and the mounting plate ensures that the encoder can be installed smoothly in the case of concentricity error, thereby realizing real-time control of the steering angle of the tire group, and then cooperating with the trolley travel mechanism to realize the straight, oblique, horizontal, forward and backward swing of the crane, which improves the maneuverability of the crane equipment and greatly improves work efficiency.

[0018] 3. The motor is a universal, fully enclosed, self-fan cooled or forced cooled three-phase asynchronous motor. The rear cover of the motor can be installed with a disc brake with DC coil excitation to achieve the slewing brake of the crane, eliminating the need for hydraulic cylinder pin fixation and making the space more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a schematic diagram of the main structure of a steering mechanism for a tire crane.

[0020] In the figure: 1. Motor reducer; 2. Driving gear; 3. Slewing bearing; 4. Axle; 5. Connecting shaft; 6. Encoder; 7. Mounting plate; 8. Lower crossbeam. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions of the present invention in conjunction with specific embodiments. Obviously, the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0022] Reference Figure 1 A steering mechanism for a tire crane includes a lower crossbeam 8, a motor reducer 1, a slewing bearing 3, and an axle 4. A mounting plate 7 is fixedly mounted on the lower crossbeam 8. The motor reducer 1 is mounted on the top of the mounting plate 7 via a first fastener. The slewing bearing 3 is mounted on the bottom of the mounting plate 7 via a detachable structure. The bottom of the slewing bearing 3 is fixedly connected to the axle 4 via a second fastener. More specifically, a tire group is provided on the axle 4. The output shaft of the motor reducer 1 extends to the bottom of the mounting plate 7 and is mounted with a driving gear 2 via a third fastener. The driving gear 2 is adapted to the slewing bearing 3.

[0023] In this embodiment, a rack is provided on the outer side of the slewing bearing 3 , and the driving gear 2 is meshed with the rack. By providing the rack, the rotation of the driving gear 2 can drive the slewing bearing 3 to rotate through the rack.

[0024] In this embodiment, the second fastener includes a bolt groove, a mounting hole and a fixing bolt. The bolt groove is provided on the bottom of the mounting plate 7, the mounting hole is provided on the inner ring of the slewing bearing 3, and a fixing bolt that matches the bolt groove is installed in the mounting hole. The second fastener includes a fixing bolt, a mounting hole and a nut. A plurality of fixing bolts are installed on the outer ring of the slewing bearing 3, and a plurality of mounting holes are provided on the axle 4. The fixing bolts pass through the corresponding mounting holes and are threaded with nuts to facilitate the fixed installation of the slewing bearing 3.

[0025] In this embodiment, an encoder 6 is installed on the top of the mounting plate 7, and a connecting shaft 5 is provided at the bottom of the encoder 6. The connecting shaft 5 passes through the slewing bearing 3 and is connected to the axle 4. A threaded groove is provided on the top of the axle 4, and an internal thread is provided on the inner wall of the threaded groove. An external thread is provided at the bottom outer side of the connecting shaft 5, and the external thread is engaged with the corresponding internal thread. Through the cooperation of the external thread and the internal thread, the encoder 6 can be connected to the axle 4 through the connecting shaft 5. The motor in the motor reducer 1 is a universal fully enclosed self-fan cooling or forced cooling three-phase asynchronous motor, and the rear cover of the motor can be installed with a disc brake with DC coil excitation.

[0026] In the utility model, the motor reducer 1 can drive the driving gear 2 to rotate, and the driving gear 2 drives the slewing bearing 3, thereby controlling the steering of the axle 4, and the axle 4 can steer the tire group. The encoder 6 is connected to the axle 4 through the connecting shaft 5, and the mounting plate 7 ensures that the encoder 6 can be installed smoothly in the case of concentricity error, thereby realizing real-time control of the steering angle of the tire group, and then cooperating with the trolley walking mechanism to realize the straight, oblique, horizontal, forward swing, backward swing, and 360-degree rotation of the crane, thereby improving the maneuverability of the crane equipment and greatly improving the work efficiency. The motor is a universal, fully enclosed, self-fan cooled or forced cooled three-phase asynchronous motor. The motor rear cover can be installed with a disc brake with DC coil excitation, thereby realizing the slewing brake of the crane, eliminating the hydraulic cylinder pin fixing method, and the space is more compact.

[0027] The above describes in detail the steering mechanism for a tire-mounted crane provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above examples is intended only to facilitate understanding of the method and core concepts of the present invention. It should be noted that those skilled in the art may, without departing from the principles of the present invention, make various improvements and modifications to the present invention, and such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A steering mechanism for a tire crane, characterized in that: It comprises a lower crossbeam (8), a motor reducer (1), a slewing bearing (3) and an axle (4); a mounting plate (7) is fixedly mounted on the lower crossbeam (8); and a motor reducer (1) is mounted on the top of the mounting plate (7) via a fastener. The bottom of the mounting plate (7) is mounted with a slewing bearing (3) via a detachable structure. The bottom of the slewing bearing (3) is fixedly connected to the axle (4) via a second fastener. The output shaft of the motor reducer (1) extends to the bottom of the mounting plate (7) and is mounted with a driving gear (2) via a third fastener. The driving gear (2) is adapted to the slewing bearing (3).

2. The steering mechanism for a tire crane according to claim 1, characterized in that: A rack is provided on the outer side of the slewing bearing (3), and the driving gear (2) is meshed with the rack.

3. The steering mechanism for a tire crane according to claim 1, characterized in that: The second fastener comprises a bolt groove, a mounting hole and a fixing bolt. The bolt groove is provided on the bottom of the mounting plate (7). The mounting hole is provided on the inner ring of the slewing bearing (3). A fixing bolt that matches the bolt groove is installed in the mounting hole.

4. The steering mechanism for a tire crane according to claim 1, characterized in that: The second fastener comprises a second fixing bolt, a second mounting hole and a nut. A plurality of second fixing bolts are mounted on the outer ring of the slewing bearing (3). A plurality of second mounting holes are opened on the axle (4). The second fixing bolts pass through the corresponding second mounting holes and are threadedly mounted with nuts.

5. The steering mechanism for a tire crane according to claim 1, characterized in that: An encoder (6) is mounted on the top of the mounting plate (7), and a connecting shaft (5) is provided at the bottom of the encoder (6). The connecting shaft (5) passes through the slewing bearing (3) and is connected to the axle (4).

6. The steering mechanism for a tire crane according to claim 5, characterized in that: A thread groove is provided on the top of the axle (4), an internal thread is provided on the inner wall of the thread groove, and an external thread is provided on the outer bottom of the connecting shaft (5), and the external thread is engaged with the corresponding internal thread.

7. The steering mechanism for a tire crane according to claim 1, characterized in that: A tire set is provided on the axle (4).

8. The steering mechanism for a tire crane according to claim 1, characterized in that: The motor in the motor reducer (1) is a universal fully enclosed self-fan cooling or forced cooling three-phase asynchronous motor, and the motor rear cover can be installed with a disc brake with DC coil excitation.

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