Crane structure

Abstract

The utility model discloses a crane structure and belongs to the technical field of hoisting machinery. Comprising a base, a stand column is arranged on the base, a suspension arm is rotationally connected to the top of the stand column, an extension arm is arranged on the suspension arm, a lifting hook is arranged at the end of the extension arm, a hydraulic component is rotationally connected to the suspension arm, and the bottom end of the hydraulic component is connected to the stand column. A front wheel, a middle wheel and a rear wheel are arranged at the bottom of the base at intervals from front to back, and at least two of the front wheel, the middle wheel and the rear wheel are large wheels with the diameter larger than 90 mm. The crane has the advantages that the starting force and steering force for pushing the crane can be reduced, the operation difficulty of operators is reduced, and the working efficiency is improved; the rotating radius of the crane can be reduced, and the steering space of the crane is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of lifting machinery, and particularly relates to a crane structure. Background Art

[0002] During the assembly or repair of automobile engines, since automobile engines are heavy, a crane is often required to lift and transport the engines. Conventional cranes include a base, columns, hydraulic components, cantilevers, etc. The two legs are assembled on the fixed leg supports of the base. The base and the bottom of the legs are provided with front, middle and rear running wheels, which jointly bear the weight and move the crane through the running wheels. In the traditional six-wheel crane structure, the rear wheels are universal wheels. Under normal circumstances, the rear wheels of the crane are in contact with the ground and bear the force when the crane is empty or loaded, and serve as the steering center point. This structure makes it difficult to push and turn when the load is large, because the wheels of traditional cranes are generally small, and the moving radius during pushing and turning is large, which makes it unsuitable for narrow and complex environments.

[0003] In view of the above-mentioned prior art, the applicant has made a useful design, and the technical solution to be introduced below is produced in this context. Utility Model Content

[0004] The purpose of the utility model is to provide a crane structure that can reduce the starting force and steering force of pushing the crane, reduce the operating difficulty of the operator, and improve the working efficiency. At the same time, the use scenario of the crane with this structure is wider.

[0005] The purpose of the present utility model is achieved in this way. A crane structure includes a base, a column is provided on the base, the top of the column is rotatably connected to a boom, an extension arm is provided on the boom, a hook is provided at the end of the extension arm, a hydraulic component is rotatably connected to the boom, the bottom end of the hydraulic component is connected to the column, and the bottom of the base is provided with front wheels, middle wheels and rear wheels at intervals from front to back, and at least two of the three wheels, the front wheels, the middle wheels and the rear wheels, are large wheels with a diameter greater than 90 mm.

[0006] In a specific embodiment of the present invention, the base includes a pair of fixed leg supports, a rear beam connected to the rear ends of the pair of fixed leg supports, and a support beam connected to the front sides of the pair of fixed leg supports. The support beam and the rear beam are arranged in parallel, the bottom of the column is fixed on the support beam, and the fixed leg supports are also connected to folding legs. The rear ends of the folding legs are rotatably connected to the fixed leg supports. There is a pair of front wheels, which are respectively arranged at the front ends of the pair of folding legs.

[0007] In another specific embodiment of the present invention, there is one middle wheel, which is arranged in the middle of the support beam; and there is a pair of rear wheels, which are respectively arranged at the two side ends of the rear beam.

[0008] In another specific embodiment of the present invention, there is a pair of middle wheels, which are respectively arranged on the outer sides of the front ends of a pair of fixed leg supports, and there is one rear wheel, which is arranged in the middle of the rear beam.

[0009] In another specific embodiment of the present invention, the fixed leg support symmetrically forms a pair of folding fixing plates on the outer wall of the rear middle part, and a U-shaped groove is formed in the middle of the fixed leg support. When the folding leg is in the unfolded state, the rear part is accommodated in the U-shaped groove, and a connecting bolt connects the pair of folding fixing plates, the fixed leg support and the folding leg to realize the hinge connection of the folding leg and the fixed leg support, and a locking pin passes through the fixed leg support and the folding leg at the front end position of the fixed leg support to unfold and fix them; the folding fixing plate extends upward, and a folding locking hole is opened at the top of the upper side of the fixed leg support. When the folding leg is folded upward, the locking pin passes through the folding locking hole to fold and fix the fixed leg support and the folding leg.

[0010] In another specific embodiment of the present invention, the front wheel has a front wheel seat, the front wheel seat is located at the front end of the folding leg and is open to the front, and the front wheel is arranged in the front wheel seat through an axis; the middle wheel has a middle wheel bracket, the caster frame of the middle wheel is fixedly installed with the middle wheel bracket, and the middle wheel bracket is fixedly connected to the base; the rear wheel has a rear wheel seat, the rear wheel seat is installed on the rear beam, and the rear wheel is arranged in the rear wheel seat through an axis.

[0011] In a further specific embodiment of the present invention, when the folding legs are unfolded, the front wheels and the middle wheels touch the ground and are subjected to force, and when the folding legs are folded, the middle wheels and the rear wheels touch the ground and are subjected to force.

[0012] In a more specific embodiment of the present invention, the front wheels and the rear wheels are straight wheels, and the middle wheel is a universal wheel, which constitutes the steering center point of the crane.

[0013] Due to the adoption of the above-mentioned structure, the utility model adopts a large wheel structure with a diameter greater than 90mm for the front, middle and rear wheels, and the middle wheel is set as a universal wheel as the steering center point, while the front and rear wheels are straight wheel structures. The rear wheel is not subjected to force during normal use and will not interfere with the steering and pushing of the front wheel. Compared with the existing technology, the beneficial effects of this solution are: the large wheel structure can further reduce the starting force, facilitate the steering and pushing of the crane, reduce the operating difficulty of the operator, and improve work efficiency; the structure with the middle wheel as the steering center can reduce the turning radius of the crane, reduce the space for the crane to turn, and make the use scenario of the crane more extensive. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1This is a schematic structural diagram of an embodiment of the present invention in an unfolded state;

[0015] Figure 2 It is a structural schematic diagram of another embodiment of the present invention in the unfolded state.

[0016] In the figure: 1. Base, 11. Fixed leg support, 111. U-shaped groove, 12. Rear beam, 13. Support beam, 14. Folding leg; 2. Column; 3. Front wheel, 31. Front wheel seat; 4. Middle wheel, 41. Middle wheel bracket; 5. Rear wheel, 51. Rear wheel seat; 6. Folding fixing plate, 61. Connecting bolt, 62. Folding locking hole, 63. Locking pin; 7. Boom, 71. Extension arm, 72. Hook; 8. Hydraulic components. DETAILED DESCRIPTION

[0017] The specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings. However, the description of the embodiments does not limit the technical solution. Any changes in form rather than substance based on the concept of the present invention should be regarded as within the scope of protection of the present invention.

[0018] In the following description, all concepts related to directionality (or orientation) such as up, down, left, right, front and back are with respect to the position state of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be understood as special limitations on the technical solutions provided by the present invention. Example 1

[0019] See also Figure 1 The utility model relates to a crane structure, comprising a base 1, wherein the base 1 comprises a pair of fixed leg supports 11, a rear beam 12 connected to the rear ends of the pair of fixed leg supports 11, and a support beam 13 connected to the front side of the pair of fixed leg supports 11, wherein the support beam 13 and the rear beam 12 are arranged in parallel. The fixed leg supports 11 are further connected to folding legs 14, and the rear ends of the folding legs 14 are rotatably connected to the fixed leg supports 11. A column 2 is provided on the support beam 13, a boom 7 is mounted on the top of the column 2, an extension arm 71 is provided on the boom 7, a hook 72 is provided at the end of the extension arm 71, and a hydraulic component 8 for providing a power source is connected between the boom 7 and the column 2.

[0020] The bottom of the base 1 is provided with front wheels 3, middle wheels 4, and rear wheels 5 at intervals from front to back. To reduce the starting and turning forces required to propel the crane, at least two of the three wheels, namely the front wheels 3, middle wheels 4, and rear wheels 5, are large wheels with a diameter greater than 90 mm; the remaining wheels can be large wheels of the same specification or smaller wheels. In other words, the front wheels 3 and rear wheels 5, or the front wheels 3 and middle wheels 4, or the middle wheels 4 and rear wheels 5 can be large wheels. The total number of middle wheels 4 and rear wheels 5 is at least three. In the case of a minimum of three, the middle wheels 4 and rear wheels 5 cooperate to form a triangular support structure. For example, there can be a pair of rear wheels 5 and one or more middle wheels 4; or there can be a pair of middle wheels 4 and one or more rear wheels 5.

[0021] See you next time Figure 1 In this embodiment, each of the front wheels 3, middle wheels 4, and rear wheels 5 comprises a pair. The front wheels 3 have front wheel seats 31, located at the front end of the folding legs 14 and open forward. The front wheels 3 are mounted within the front wheel seats 31 via a shaft. The middle wheels 4 have middle wheel brackets 41, located at the front end of the fixed leg supports 11. The caster brackets of the middle wheels 4 are fixedly mounted to the middle wheel brackets 41. The rear wheels 5 have rear wheel seats 51, mounted at both ends of the rear beam 12 and open downward. The rear wheels 5 are mounted within the rear wheel seats 51 via a shaft. Compared to the prior art, the front wheels 3, middle wheels 4, and rear wheels 5 are all larger wheels with diameters greater than 90 mm. In actual applications, the diameter generally does not exceed 500 mm. This large wheel structure reduces the crane's starting and steering forces, enabling better steering and propulsion, reducing operator difficulty, and improving operational efficiency. Furthermore, the front wheels 3 and rear wheels 5 are straight wheels, while the middle wheel 4 is a universal wheel and also serves as the steering center. The middle wheel 4 serves as the rotation center, which can appropriately reduce the turning radius and the space for the crane to turn, thereby expanding the crane's application scenarios.

[0022] The crane adopts a folding structure. Specifically, the fixed leg support 11 symmetrically forms a pair of folding fixing plates 6 on the outer wall of the rear middle part. A U-shaped groove 111 is formed in the middle of the fixed leg support 11. When the folding leg 14 is in the unfolded state, that is, when the crane is in use, the rear part of the folding leg 14 is accommodated in the U-shaped groove 111. A connecting bolt 61 connects the pair of folding fixing plates 6, the fixed leg support 11 and the folding leg 14 to realize the hinge connection between the folding leg 14 and the fixed leg support 11. A locking pin 63 passes through the fixed leg support 11 and the folding leg 14 at the front end position of the fixed leg support 11 to unfold and fix them. The folding fixing plate 6 extends upward, and a folding locking hole 62 is opened at the top of the upper side of the fixed leg support 11. When the folding leg 14 is folded and retracted upward, the locking pin 63 passes through the folding locking hole 62 to fold and fix the fixed leg support 11 and the folding leg 14. In the above structure, when the folding legs 14 are unfolded, the crane's center of gravity is located on the pair of middle wheels 4. The front wheels 3 and middle wheels 4 are grounded and bear the force. At this time, the rear wheels 5 are not subjected to force and will not interfere with the steering and propulsion of the front wheels 3 and middle wheels 4. This structure makes the crane's steering more convenient and flexible. When the folding legs 14 are folded, the middle wheels 4 and rear wheels 5 are grounded and bear the force, facilitating propulsion. The crane's center of gravity shifts rearward, ensuring that the crane will not tilt forward when folded. Example 2

[0023] See Figure 2 In this embodiment, the middle wheels 4 are a pair, and a pair of middle wheels 4 are arranged on the outside of the front end of a pair of fixed leg supports 11 through middle wheel brackets 41. There is only one rear wheel 5, which is arranged in the middle of the rear beam 12 through a rear wheel seat 51.

[0024] When the rear wheels 5 are a pair and the middle wheel 4 is one, the middle wheel 4 is arranged in the middle of the support beam 13 , and the pair of rear wheels 5 are respectively arranged at both side ends of the rear beam 12 .

Claims

1. A crane structure, comprising a base (1), a column (2) provided on the base (1), a boom (7) rotatably connected to the top of the column (2), an extension arm (71) provided on the boom (7), a hook (72) provided at the end of the extension arm (71), a hydraulic component (8) rotatably connected to the boom (7), the bottom end of the hydraulic component (8) being connected to the column (2), a front wheel (3), a middle wheel (4) and a rear wheel (5) being provided at intervals from front to back at the bottom of the base (1), characterized in that: At least two of the three wheels, namely the front wheel (3), the middle wheel (4) and the rear wheel (5), are large wheels with a diameter greater than 90 mm.

2. A crane structure according to claim 1, characterized in that: The base (1) comprises a pair of fixed leg supports (11), a rear beam (12) connected to the rear ends of the pair of fixed leg supports (11), and a support beam (13) connected to the front side of the pair of fixed leg supports (11). The support beam (13) and the rear beam (12) are arranged in parallel. The bottom of the column (2) is fixed on the support beam (13). The fixed leg supports (11) are further connected with folding legs (14). The rear ends of the folding legs (14) are rotatably connected to the fixed leg supports (11). There is a pair of front wheels (3) which are arranged at the front ends of the pair of folding legs (14).

3. A crane structure according to claim 2, characterized in that: There is one middle wheel (4) arranged at the middle of the support beam (13); there is a pair of rear wheels (5) arranged at the two side ends of the rear beam (12).

4. A crane structure according to claim 2, characterized in that: There is a pair of middle wheels (4) which are respectively arranged on the outer sides of the front ends of a pair of fixed leg supports (11); there is one rear wheel (5) which is arranged in the middle of the rear beam (12).

5. The crane structure according to claim 2, characterized in that: The fixed leg support (11) is symmetrically formed with a pair of folding fixing plates (6) on the outer wall of the rear middle part, and a U-shaped groove (111) is formed in the middle of the fixed leg support (11). When the folding leg (14) is unfolded, the rear part is accommodated in the U-shaped groove (111). A connecting bolt (61) connects the pair of folding fixing plates (6), the fixed leg support (11) and the folding leg (14) to realize the hinge connection between the folding leg (14) and the fixed leg support (11). A locking pin (63) passes through the fixed leg support (11) and the folding leg (14) at the front end position of the fixed leg support (11) to unfold and fix; the folding fixing plate (6) extends upward, and a folding locking hole (62) is opened at the top of the upper side of the fixed leg support (11). When the folding leg (14) is folded upward, the locking pin (63) passes through the folding locking hole (62) to fold and fix the fixed leg support (11) and the folding leg (14).

6. A crane structure according to claim 3 or 4, characterized in that: The front wheel (3) has a front wheel seat (31), the front wheel seat (31) is located at the front end of the folding leg (14) and is opened forward, and the front wheel (3) is arranged in the front wheel seat (31) through an axis; the middle wheel (4) has a middle wheel bracket (41), the caster frame of the middle wheel (4) is fixedly installed with the middle wheel bracket (41), and the middle wheel bracket (4) is fixedly connected to the base (1); the rear wheel (5) has a rear wheel seat (51), the rear wheel seat (51) is installed on the rear beam (12), and the rear wheel (5) is arranged in the rear wheel seat (51) through an axis.

7. The crane structure according to claim 2, characterized in that: When the folding legs (14) are unfolded, the front wheels (3) and the middle wheels (4) touch the ground and receive force; when the folding legs (14) are folded, the middle wheels (4) and the rear wheels (5) touch the ground and receive force.

8. The crane structure according to claim 1, characterized in that: The front wheel (3) and the rear wheel (5) are straight wheels, and the middle wheel (4) is a universal wheel, forming the turning center point of the crane.

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