Crane supporting leg and hoisting equipment

Abstract

A crane landing leg and hoisting equipment belong to the technical field of hoisting equipment, the crane landing leg comprises a landing leg main body, the landing leg main body comprises a first leg part and a second leg part which are fixedly connected, the first leg part is located above the second leg part, the cross section of the first leg part is elliptical, and the cross section of the second leg part is circular. The first leg part of the upper part of the supporting leg main body is of a structure with an oval cross section and is provided with a long shaft and a short shaft, and the long shaft and the short shaft have different torsional rigidities, so that stress can be more effectively distributed when the upper part of the supporting leg main body bears torsional moment, and better torsional performance is provided; the second leg part of the lower part of the supporting leg main body is of a structure with a circular cross section, and a variable cross section arrangement mode is adopted, so that the torsion resistance and the supporting stability are improved, the use of materials is reduced, the use cost is reduced, the overall mass is reduced, and the energy consumption is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of lifting equipment, in particular to a crane outrigger and a lifting equipment. Background Art

[0002] Lifting equipment is a kind of mechanical equipment widely used in construction sites, ports, factories and other places where heavy objects need to be moved. Its main function is to lift and move heavy objects. The working principle of lifting equipment is mainly based on mechanics and mechanical principles. The driving device provides power, and the working mechanism realizes the lifting, moving and rotation of heavy objects. The picking device grabs or lifts the heavy objects according to specific needs. The supporting device supports and transfers the load to ensure the stability and safety of the crane.

[0003] The outrigger is a supporting device installed on the base frame (or chassis, frame) of the lifting equipment. The main function of the outrigger is to increase the supporting base of the lifting equipment, thereby increasing the supporting base of the lifting equipment to improve the anti-overturning stability of the entire vehicle and thereby improve the lifting capacity.

[0004] The cross-section of the outriggers of existing lifting equipment is rectangular or circular. The outriggers with rectangular cross-sections have poor torsional resistance and are very easy to deform. It is usually necessary to weld support rods inside the outriggers with rectangular cross-sections to effectively enhance the anti-deformation ability by forming a triangular structure. However, this will increase the overall weight of the outriggers and increase the cost of use. In addition, the wind coefficient of the outriggers with rectangular cross-sections is larger, which increases wind resistance and leads to increased energy consumption. The outriggers with circular cross-sections have a uniform cross-sectional shape and consistent torsional resistance in all directions. When subjected to torsional torque, the outriggers with circular cross-sections may undergo relatively large torsional deformation. Summary of the invention

[0005] In order to solve the technical problems in the above-mentioned background technology that the existing lifting equipment legs have poor torsional resistance, large overall weight, and large wind coefficient, which leads to increased energy consumption, the present invention provides a crane leg.

[0006] The technical solution of the present invention is as follows: The present invention provides a crane leg, including a leg body, the leg body including a first leg portion and a second leg portion fixedly connected, the first leg portion being located above the second leg portion, the first leg portion having an elliptical cross-section, the second leg portion having a circular cross-section, the first leg portion at the upper portion of the leg body being a structure with an elliptical cross-section, having a major axis and a minor axis, the major axis and the minor axis having different torsional stiffnesses, such a characteristic enabling the upper portion of the leg body to more effectively distribute stress when subjected to a torsional moment, thereby providing better torsional resistance, the second leg portion at the lower portion of the leg body being a structure with a circular cross-section, adopting a variable cross-section setting, while improving torsional resistance and support stability, also reducing material usage, reducing use costs, and also reducing overall mass and energy consumption.

[0007] Preferably, the main body of the leg is a hollow structure to ensure that the overall mass of the leg is reduced, thereby reducing energy consumption.

[0008] Preferably, the cross-section of the first leg gradually decreases from top to bottom, and a variable cross-sectional shape, variable cross-sectional area, and box beam structure are adopted. While improving torsional performance and support stability, it also reduces the use of materials, reduces the cost of use, and also reduces the overall mass and energy consumption.

[0009] Preferably, the first leg portion includes a parallel front plate and a rear plate, and adjacent two sides of the front plate and the rear plate are fixedly connected together by a side plate respectively, so as to form an elliptical box beam structure.

[0010] Preferably, the front plate and the rear plate are both inverted triangular plate structures, which are compatible with the variable cross-section setting, facilitate assembly and welding, and can enhance the stability of the leg body. The side plates are semicircular plate structures that can adapt to the top cross-sectional shape of the second leg to facilitate the fixed connection between the first leg and the second leg.

[0011] Preferably, since the stress at the connection is relatively heavy, the central axis of the second leg coincides with the central axis of the first leg, which can ensure that the force at the connection between the first leg and the second leg is more uniform, help reduce material fatigue and damage caused by excessive stress, extend the service life of the structure, and improve the aesthetics.

[0012] The present invention also provides a lifting equipment, including a crane leg, the leg body is arranged obliquely, the upper end of the leg body is connected to the upper guide rail of the lifting equipment through a first connecting piece, and the lower end of the leg body is connected to the lower track of the lifting equipment through a second connecting piece.

[0013] Preferably, the arc-shaped side of the upper end of the leg body is located in the moving direction of the lifting equipment, which disperses the impact force of the wind in the moving direction, effectively reduces wind resistance, and thus reduces the working wind load, so that the energy consumption of the lifting equipment during operation is reduced, while significantly reducing the safety hazards caused by wind influence.

[0014] It can be seen from the above technical solutions that the advantages of the present invention are: 1. The first leg portion of the upper part of the leg body is a structure with an elliptical cross-section, having a major axis and a minor axis, and the major axis and the minor axis have different torsional stiffnesses. This characteristic enables the upper part of the leg body to distribute stress more effectively when subjected to torsional torque, thereby providing better torsional resistance. The second leg portion of the lower part of the leg body is a structure with a circular cross-section, which adopts a variable cross-section setting. While improving torsional resistance and support stability, it also reduces the use of materials, reduces the use cost, and also reduces the overall quality and energy consumption.

[0015] 2. Both the front plate and the rear plate are inverted triangular plate structures, which are compatible with the variable cross-section setting method, are convenient for assembly and welding, and can enhance the stability of the leg body. The side plates are semicircular plate structures, which can be compatible with the top cross-sectional shape of the second leg to facilitate the fixed connection between the first leg and the second leg.

[0016] 3. The central axis of the second leg coincides with the central axis of the first leg, which can ensure that the force at the connection between the first leg and the second leg is more uniform, help reduce material fatigue and damage caused by excessive stress, extend the service life of the structure, and improve the aesthetics. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the front view structure of a crane leg according to one or more embodiments of the present invention; Figure 2 A schematic side structural diagram of a crane leg according to one or more embodiments of the present invention; Figure 3 for Figure 1 AA cross-sectional structural diagram of the structure shown; Figure 4 It is a schematic diagram of the overall structure of a crane leg according to one or more embodiments of the present invention; Figure 5 for Figure 4 A schematic diagram of a local enlarged structure at position A of the structure shown; Figure 6 A schematic diagram of a crane leg in use according to one or more embodiments of the present invention; The components represented by the reference numerals in the figure are: 1. Leg body; 2. First leg; 3. Second leg; 4. Front plate; 5. Back plate; 6. Side plate; 7. Cavity; 8. First connecting piece; 9. Second connecting piece. DETAILED DESCRIPTION

[0019] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0020] Example 1 In a typical embodiment of the present invention, Figure 1-Figure 5 As shown, a crane leg is proposed, including: a leg body 1, a first connecting member 8 and a second connecting member 9, the first connecting member 8 is fixedly installed at the upper end of the leg body 1, and is used to connect the upper end of the leg body 1 with the upper guide rail of the lifting equipment, and the second connecting member 9 is fixedly installed at the lower end of the leg body 1, and is used to connect the lower end of the leg body 1 with the lower rail of the lifting equipment.

[0021] The leg body 1 is a hollow box beam structure, and the leg body 1 is a variable cross-section structure (including cross-sectional shape and cross-sectional area). Specifically, the leg body 1 includes a first leg 2 and a second leg 3, the first leg 2 and the second leg 3 are fixedly connected together, and the first leg 2 is located above the second leg 3, and the cross-section of the first leg 2 is elliptical (such as Figure 3 As shown, the cross section of the second leg portion 3 is circular (as shown Figure 4 As shown in the figure, the central axis of the second leg 3 coincides with the central axis of the first leg 2, and the first leg 2 and the second leg 3 contain a cavity 7 therein.

[0022] The upper part of the leg body 1 is a structure with an elliptical cross-section, having a major axis and a minor axis, and the major axis and the minor axis have different torsional stiffnesses. This characteristic enables the upper part of the leg body 1 to distribute stress more effectively when subjected to torsional torque, thereby providing better torsional resistance. The lower part of the leg body 1 is a structure with a circular cross-section, and the cross-sectional area is smaller than the cross-sectional area of ​​the top end of the upper part of the leg body 1. The variable cross-sectional shape, variable cross-sectional area, and box beam structure are adopted. While improving torsional resistance and support stability, it also reduces the use of materials, reduces the cost of use, and also reduces the overall quality and energy consumption.

[0023] The first leg 2 includes a front plate 4, a rear plate 5 and two side plates 6, wherein the front plate 4 and the rear plate 5 are arranged opposite to each other and are parallel, and the adjacent two sides of the front plate 4 and the rear plate 5 are fixedly connected together by a side plate 6 respectively, the front plate 4 and the rear plate 5 are both inverted triangular plate structures, the side plate 6 is a semicircular plate structure, and both sides of the front plate 4 and the rear plate 5 are fixedly connected to the side plates 6 by welding; the second leg 3 is a tubular structure with a constant cross-sectional area from top to bottom.

[0024] Specifically, the first leg 2 and the second leg 3 are both made of 10 mm thick steel plates. In actual use and manufacturing, the overall weight of the legs in this embodiment is 6.82 tons. The weight of rectangular and circular cross-section legs of the same length is about 24.53 tons. The weight of the legs in this embodiment is significantly reduced.

[0025] In this embodiment, the cross-section of the first leg 2 is elliptical, and the cross-sectional area gradually decreases from top to bottom. The front plate 4 and the rear plate 5 both adopt an inverted triangular plate structure, which is adapted to the variable cross-section setting method, is convenient for assembly and welding, and can enhance the stability of the leg body 1. The side plate 6 of the semicircular plate structure can be adapted to the cross-sectional shape of the top end of the second leg 3 to facilitate the fixed connection between the first leg 2 and the second leg 3.

[0026] In actual use, the front plate 4 and the rear plate 5 of the first leg 2 of the leg body 1 are parallel to the track, so that the side plate 6 is located in the moving direction of the lifting equipment, dispersing the impact force of the wind in the moving direction, effectively reducing the wind resistance, and then reducing the working wind load, so that the energy consumption of the lifting equipment during operation is reduced, and at the same time significantly reducing the safety hazards caused by the influence of wind.

[0027] Calculate the wind load on the rectangular and elliptical outriggers along the moving direction of the rail crane according to the wind load formula , where F is the wind load (N), A is the windward area (m 2 ), q is wind pressure (N / m 2 ), Cf is the wind force coefficient; When working wind speed , working wind pressure , non-operating wind speed , non-working wind pressure , the wind load formula is used to calculate the wind loads of the rectangular and elliptical cross-section legs, as shown in Table 1: Table 1

[0028] In the horizontal and vertical directions along the moving direction of the lifting equipment, according to the wind load formula When the working wind speed , working wind pressure , non-operating wind speed , non-working wind pressure , the wind loads of the rectangular and elliptical cross-section legs are obtained, as shown in Table 2: Table 2

[0029] Comparing the wind loads of the rectangular cross-section legs and the elliptical cross-section legs, along the moving direction of the lifting equipment, the working wind load and non-working wind load of the elliptical cross-section legs are both about 71% of that of the rectangular cross-section legs, and along the horizontal and vertical directions of the moving direction of the lifting equipment, the working wind load and non-working wind load of the elliptical cross-section legs are both about 56% of that of the rectangular cross-section legs, effectively reducing the wind load. The major axis and minor axis of the elliptical cross-section legs have different torsional stiffnesses, so that the leg body 1 can distribute stress more effectively when subjected to torsional torque. Compared with the circular cross-section legs, it can provide better torsional resistance while reducing wind resistance.

[0030] Example 2 In another typical embodiment of the present invention, a lifting device is provided, which uses the legs in Example 1, such as Figure 6 As shown, the lifting equipment includes at least two groups of legs, each group of legs contains two inclined leg bodies 1, the inclination angle of the leg body 1 is 8°-12°, the cross-section of the upper end of the leg body 1 is elliptical, the lower end of the leg body 1 is circular, the upper end of the leg body 1 is connected to the upper guide rail of the lifting equipment through a first connecting member 8, and the lower end of the leg body 1 is connected to the lower track of the lifting equipment through a second connecting member 9.

[0031] The arc-shaped side of the upper end of the leg body 1 is located in the moving direction of the lifting equipment to disperse the impact force of the wind in the moving direction, effectively reduce wind resistance, and thus reduce the working wind load, so that the energy consumption of the lifting equipment during operation is reduced, while significantly reducing the safety hazards caused by the influence of wind.

[0032] It is understandable that the lifting equipment is used for lifting containers. The lifting equipment can be a rail-mounted crane, a tire crane, etc., and no excessive restrictions are made here. The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A crane outrigger, comprising: The leg body (1) is characterized in that the leg body (1) comprises a first leg portion (2) and a second leg portion (3) which are fixedly connected, the first leg portion (2) is located above the second leg portion (3), the cross section of the first leg portion (2) is elliptical, and the cross section of the second leg portion (3) is circular.

2. The crane leg according to claim 1, characterized in that: The leg body (1) is a hollow structure.

3. The crane leg according to claim 2, characterized in that: The cross section of the first leg portion (2) gradually decreases in a direction from top to bottom.

4. The crane leg according to claim 3, characterized in that: The first leg portion (2) comprises a parallel front plate (4) and a rear plate (5), and adjacent two sides of the front plate (4) and the rear plate (5) are respectively fixedly connected together via a side plate (6).

5. The crane leg according to claim 4, characterized in that: The front plate (4) and the rear plate (5) are both inverted triangular plate structures, and the side plate (6) is a semicircular plate structure.

6. The crane leg according to claim 1, characterized in that: The central axis of the second leg (3) coincides with the central axis of the first leg (2).

7. A lifting device, characterized in that: The crane leg as claimed in any one of claims 1 to 6 is utilized, wherein the leg body (1) is arranged tilted, the upper end of the leg body (1) is connected to the upper guide rail of the lifting equipment through a first connecting member (8), and the lower end of the leg body (1) is connected to the lower rail of the lifting equipment through a second connecting member (9).

8. The lifting device according to claim 7, characterized in that The arc-shaped side of the upper end of the leg body (1) is located in the moving direction of the lifting equipment.

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