WO2018036181A1

WO2018036181A1 - Lattice boom structure and crane

Info

Publication number: WO2018036181A1
Application number: PCT/CN2017/081276
Authority: WO
Inventors: 陆川; 曹立峰; 陈志灿; 张平海; 谷思生; 付玉琴; 李长青; 于敬利
Original assignee: 徐州重型机械有限公司
Priority date: 2016-08-25
Filing date: 2017-04-20
Publication date: 2018-03-01
Also published as: CN106241628A

Abstract

Disclosed in the present invention are a lattice boom structure and a crane. The lattice boom structure comprises a connecting frame (1), a rotating frame (2), and a variable amplitude oil cylinder (3). The connecting frame (1) is rotationally connected to the rotating frame (2). One end of the variable amplitude oil cylinder (3) is rotationally connected to the connecting frame (1), the other end of the variable amplitude oil cylinder (3) is rotationally connected to the rotating frame (2), and the variable amplitude oil cylinder (3) bears a pressure. By means of the structure form of the pressure cylinder type lattice boom, the structures of the rotating frame and the connecting frame are changed, so that the variable amplitude oil cylinder can be disposed at the bottom and bears a pressure and does not bear a tensile force, and accordingly potential safety hazards caused by internal leakage of a hydraulic oil cylinder are avoided.

Description

Truss arm structure and crane

Technical field

The invention relates to the field of engineering machinery, in particular to a truss arm structure and a crane.

Background technique

As the height of the building floor continues to increase, the lifting height of the crane is required to be higher when the roof is working. When the floor height exceeds the maximum lifting height of the main arm, the truss arm operation is required. Referring to Fig. 1 to Fig. 3, the truss arm is installed at the end of the main arm, and is mainly composed of a seamless steel pipe. The length thereof is adjusted by increasing or decreasing the lengthening section 104, and is used for expanding the working range of the boom system and improving the lifting height of the whole vehicle. . In order to increase the working condition, the truss arm boom can generally realize different angle transformations, and the angle transformation is mainly completed by the combination of the rotating frame 102 and the stepless variator cylinder 103. The telescopic arm is provided with a connecting frame 101, and the connecting frame 101 is rotatably connected with the rotating frame 102, and the rotation thereof is driven by the stepless variable amplitude cylinder 103 provided between the two. Specifically, the lower hinge point 108 of the rotating frame 102 and the lower hinge point of the connecting frame 101 are rotatably connected, that is, the rotation point A of the entire truss arm structure is formed. The bottom of the rotating frame 102 protrudes toward the connecting frame 101, and a stepless variable amplitude cylinder 103 is disposed between the upper hinge point of the connecting frame 101 and the upper hinge point of the rotating frame 102. According to industry agreement, when the truss arm structure is placed horizontally on the ground, the side facing the sky is the top and the side facing the ground is the bottom. The rotation point A designed by the existing truss arm structure is located at the bottom of the boom, and the stepless variator cylinder 103 is located at the top of the boom, as shown in FIGS. 1 and 2. A jib 105 is provided at the top end of the extension section 104, and two jibs 106 are provided at the top end of the section jib 105. The main chord 107 is shown in Figure 2.

The inventors have found that at least the following problems exist in the prior art: the prior art has the stepless variable amplitude cylinder 103 disposed on the top of the boom structure. Although the design difficulty is small, the top stepless variable oil cylinder 103 is used during the crane lifting operation. The tensile force is increased, which increases the safety hazard caused by the internal leakage problem of the stepless variable amplitude cylinder 103, and affects the safety of the lifting equipment.

Summary of the invention

One of the objects of the present invention is to provide a truss arm structure and a crane for optimizing an existing truss arm structure.

To achieve the above object, the present invention provides the following technical solutions:

An embodiment of the present invention provides a truss arm structure, including a connecting frame, a rotating frame and a slewing cylinder; the connecting frame is rotatably connected to the rotating frame, and one end of the variator cylinder and the connecting frame are rotatable Connected, the other end of the luffing cylinder is rotatably coupled to the rotating frame; wherein the luffing cylinder is subjected to pressure.

In an optional embodiment, the connecting bracket includes a first connecting portion at the top and a second connecting portion at the bottom, the rotating frame including a third connecting portion at the top and a fourth connecting portion at the bottom; The first connecting portion and the third connecting portion are rotatably connected, and the second connecting portion and one end of the horn cylinder are rotatably connected, and the other end of the horn cylinder and the fourth connecting portion are rotatably connected Rotatable connection

When the truss arm structure is in a mounted state and laid flat, the first connecting portion is located at a side of the second connecting portion adjacent to the rotating frame, and the third connecting portion is located at a position of the fourth connecting portion One side of the connector.

In an optional embodiment, the connecting bracket includes a first joint and a first tubular member, the first joint is provided with a first connecting hole, and the first connecting hole serves as the first connecting portion, the first The number of tubes is at least two, and one end of each of the first tubes is connected to the first joint, and the other end of each of the first tubes is for connecting with the telescopic arm.

In an optional embodiment, the first joint includes a first bent plate and a first vertical plate, and the number of the first vertical plates is at least two, and each of the first vertical plates is disposed in parallel with the One side of the first bent plate is recessed, and each of the first vertical plates is provided with the first connecting hole.

In an alternative embodiment, the other ends of each of the first tubular members are separated from one another.

In an optional embodiment, the rotating frame includes a second joint and a second pipe, the second joint is provided with a second connecting hole, and the second connecting hole serves as the third connecting portion, the first The number of the two tubular members is at least two, and one end of each of the second tubular members is connected to the second joint, and the other end of each of the second tubular members is connected to the secondary arm.

In an alternative embodiment, the other ends of each of the second tubular members are separated from one another.

In an optional embodiment, the second joint includes a second bent plate and a second vertical plate, the second vertical plate is at least two, and each of the second vertical plates is disposed in parallel with the A concave side of the second bending plate, each of the second vertical plates is provided with the second connecting hole.

In an alternative embodiment, the top of the connecting frame is of an equal cross-sectional structure; and/or the connecting frame The bottom is a variable cross-sectional structure.

In an alternative embodiment, the rotating frame is a variable cross-sectional structure as a whole.

In an alternative embodiment, the number of the variable amplitude cylinders is at least two, and each of the variable amplitude cylinders is arranged side by side.

The embodiment of the invention further provides a crane, comprising the truss arm structure provided by any technical solution of the invention.

Based on the foregoing technical solutions, the embodiments of the present invention can at least produce the following technical effects:

The above-mentioned pressure cylinder type truss arm structure adopts a hydraulic cylinder to realize stepless amplitude variation, and changes the structure of the rotating frame, so that the variable amplitude cylinder can be disposed at the bottom, and the variable amplitude cylinder is subjected to pressure instead of pulling force during lifting operation, and fully avoids The safety of the hydraulic cylinder is caused by the leakage of the hydraulic cylinder, so that the boom has good overall stability.

DRAWINGS

1 is a schematic structural view of a truss arm structure in the prior art;

Figure 2 is a partial enlarged view of Figure 1;

Figure 3 is a schematic view of another angle of the portion shown in Figure 2;

4 is a schematic structural view of a truss arm according to an embodiment of the present invention;

Figure 5 is a partial schematic view showing the structure of the truss arm when the variable amplitude cylinder is fully retracted;

Figure 6 is a partial schematic view showing the structure of the truss arm when the variable amplitude cylinder is fully extended;

Figure 7 is a partial structural view of the connecting frame;

Figure 8 is a partial structural view of the rotating frame;

Figure 9 is a partial structural view of the connecting frame;

Figure 10 is a schematic view showing the structure of the connecting frame.

Reference mark:

1, connecting frame; 2, rotating frame; 3, variable amplitude cylinder; 4, lengthening section; 5, one jib; 6, two jib; 7, main chord; 8, bending plate; a joint; 12, a first pipe member; 13, a first connecting hole; 14, a first bent plate; 15, a first vertical plate; 16, a first connecting portion; 17, a second connecting portion; 22, the second pipe member; 23, the second connecting hole; 24, the second bent plate; 25, the second vertical plate; 26, the third connecting portion; 27, the fourth connecting portion; 101, the connecting frame; Rotating frame; 103, variable amplitude oil Cylinder; 104, lengthening section; 105, one jib; 106, two jibs; 107, main chord; 108, lower hinge point.

detailed description

The technical solution provided by the present invention will be described in more detail below with reference to FIGS. 4-10.

The nouns or terms used in this embodiment are explained.

Truss arm: A type of structure installed at the end of a boom to increase the length of the boom, the lifting height, and the hoisting weight. The truss arm is mainly composed of seamless steel tubes.

Rotating frame: A truss structure that is connected to the front part (ie, the jib) through a hinge point and a stepless variability cylinder. The working angle of the truss arm is changed by adjusting the telescopic length of the stepless variator cylinder.

Connecting frame: A truss structure with different front and rear end sections with different cross-sections and connected to the boom.

Stepless variable amplitude cylinder: A hydraulic cylinder located between the truss arm rotating frame and the connecting frame for realizing the lifting angle transformation of the truss arm.

In this embodiment, according to the industry agreement, when the truss arm boom structure is horizontally placed on the ground, the side facing the sky is the top, and the side facing the ground is the bottom.

Embodiments of the present invention provide a truss arm structure for connecting a jib arm to a telescopic arm to expand the working range of the crane. The jib of each section of the truss arm structure can adopt a box type steel plate structure.

Referring to FIG. 4 and FIG. 5, an embodiment of the present invention provides a truss arm structure, including a connecting frame 1, a rotating frame 2, and a variator cylinder 3. The connecting frame 1 and the rotating frame 2 are rotatably connected, one end of the variable amplitude cylinder 3 is rotatably connected with the connecting frame 1, and the other end of the variable amplitude cylinder 3 is rotatably connected with the rotating frame 2. Among them, the variable amplitude cylinder 3 is subjected to pressure. The setting position of the variable amplitude cylinder 3 is such that it is subjected to pressure without receiving tensile force to avoid a safety hazard due to internal leakage of the hydraulic cylinder, so that the boom has good overall stability.

Referring to Figures 4 and 5, the truss arm structure includes a connecting frame 1, a rotating frame 2, and a variator cylinder 3. The connector 1 includes a first connecting portion 16 at the top and a second connecting portion 17 at the bottom. The revolving frame 2 includes a third connecting portion 26 at the top and a fourth connecting portion 27 at the bottom. The first connecting portion 16 and the third connecting portion 26 are rotatably connected, the second connecting portion 17 and one end of the variator cylinder 3 are rotatably connected, and the other end of the slewing cylinder 3 is rotatably connected to the fourth connecting portion 27. When the truss arm structure is in the mounted state and laid flat, in the direction of gravity, the first connecting portion 16 is located at a side of the second connecting portion 17 near the rotating frame 2, and the third connecting portion 26 is located at the fourth connecting portion. 27 is adjacent to one side of the connecting frame 1 so that there is sufficient space between the second connecting portion 17 and the fourth connecting portion 27 to enable the luffing cylinder 3 to be disposed.

As shown in FIG. 5, the outer end joint of the truss arm structure luffing cylinder 3 is rotatably connected with the second connecting portion 17 of the connecting frame 1, and the cylinder rod end joint is rotatably connected with the fourth connecting portion 27 of the rotating frame 2, and the connecting frame is connected. 1 The first connecting portion 16 is connected to the third connecting portion 26 of the revolving frame 2 as a luffing hinge. The expansion and contraction cylinder 3 telescopic will drive the rotating frame 2 to rotate relative to the luffing hinge to realize the variable amplitude.

The above-mentioned truss arm structure is used to assemble the slewing cylinder 3 to the bottom of the boom. In this embodiment, the following relationship is taken as an example. When the slewing cylinder 3 is fully extended, the jib angle is 0 degrees; the variator cylinder 3 is fully deflated. When the jib angle is 30 degrees; when the splay cylinder 3 is half extended, the jib angle is 15 degrees. The variable angle is the angle between the length direction of the main arm and the longitudinal direction of one of the jib 5/two jibs 6.

In the above technical solution, when the variable-width cylinder 3 is located at the bottom, the boom is changed from 0 degree to 30 degrees, the cylinder is gradually shortened, and the connecting frame 1 adopts a structure with a concave bottom and a convex top, and the variable-width cylinder 3 is disposed at the bottom. Stretching provides enough space. The variable amplitude cylinder 3 is disposed at the bottom of the connecting frame 1 and the rotating frame 2. During the variable amplitude process, the variable amplitude cylinder 3 is mainly subjected to pressure, and the intrinsic solution is solved from the system principle. The safety hazard caused by the leakage can fully exert the high compressive performance of the weld and improve the performance of the boom; under the same performance, the cylinder affected by the pressure is lighter than the cylinder with the tensile force. The above technical solution optimizes the truss arm structure and increases the stability of the crane.

Referring to Figures 6 and 7, the connector 1 includes a first joint 11 and a first tubular member 12. The first joint 11 is provided with a first connecting hole 13 as a first connecting portion 16. The number of the first tubes 12 is at least two, and one end of each of the first tubes 12 is connected to the first joint 11, and the other end of each of the first tubes 12 is connected to the telescopic arm.

Further, the other ends of the respective first tubular members 12 are separated from each other, so that the connecting frame 1 is balanced by force.

The size of the first joint 11 is smaller than the size of the telescopic arm, which makes the first tubular members 12 have a divergent structure, that is, the ends of the first tubular members 12 connected to the first joint 11 are relatively close to each other, and are relatively concentrated; The other end of the first tubular member 12 is relatively dispersed, as shown in FIG. The connecting frame 1 of this structure is more evenly balanced.

The stability problem of the main chord 7 and the form of the force determine the structural form. The connecting structure of the above-mentioned structure can be rotated at the joint, and the single-point divergent structure can perfectly cooperate with the pressure-changing variator cylinder 3, so that the connection of the above structure is achieved. Frame 1 is more balanced.

Referring to Fig. 7, the first joint 11 includes a first bent plate 14 and a first vertical plate 15, and the number of the first vertical plates 15 is at least two. Each of the first vertical plates 15 is disposed in parallel on a concave side of the first bent plate 14 , and each of the first vertical plates 15 is provided with a first connecting hole 13 .

The first joint 11 described above has a semi-package structure and can enclose the structure at the third joint portion 26. The joints of the connecting frame 1 and the rotating frame 2 and the variable amplitude cylinder 3 are designed to be double-forked with the oil cylinder and a semi-packed compact structure which is connected with the single-point divergence of the seamless steel pipe, and is reinforced by the bending plate 8, see FIG. To enhance its stability, after partial optimization, solve the problem of interference between the cylinder and the joint when the cylinder is changed. As shown in Fig. 5, the joint is in the form of an effective joint of the cylinder type truss arm.

Referring to FIG. 8, the rotating frame 2 can adopt the following structure. The rotating frame 2 includes a second joint 21 and a second pipe member 22. The second joint 21 is provided with a second connecting hole 23, and the second connecting hole 23 serves as a third connecting portion. 26. The pin passes through the first connecting hole 13 and the second connecting hole 23 to form a rotatable connection between the rotating frame 2 and the connecting frame 1. The number of the second tubular members 22 is at least two, and one end of each of the second tubular members 22 is connected to the second joint 21, and the other end of each of the second tubular members 22 is connected to the secondary arm.

Specifically, one ends of the respective second tubular members 22 are concentrated, and the other ends of the respective second tubular members 22 are separated from each other.

The second joint 21 described above, the rotary joint at the receiving end, and the single-point diverging structure can be perfectly matched with the pressure-varying variator cylinder 3.

When the connecting frame 1 and the rotating frame 2 are designed, the design principle of equalizing the force of the truss structure and limiting the length of the compressed pipe member is adopted, and the connection with the variable amplitude cylinder 3 is received, thereby improving the strength and stability of the truss structure. Create a telescopic space for the variable amplitude cylinder 3 to improve the variable amplitude efficiency.

Referring to FIG. 8 , the second joint 21 includes a second bent plate 24 and a second vertical plate 25 . The number of the second vertical plates 25 is at least two, and each of the second vertical plates 25 is disposed in parallel with the second bent plate 24 . On the concave side, each of the second vertical plates 25 is provided with a second connecting hole 23.

One end of each of the second tubular members 22 is connected to the second bent plate 24 to form a relatively concentrated structure, and the other end of the second tubular member 22 is dispersed to make the force relatively balanced.

Referring to Figure 6, the top of the connecting frame 1 has an equal cross-sectional structure. And/or, the bottom of the connecting frame 1 has a variable cross-sectional structure.

The top of the connecting frame 1 has an equal section structure, the joint of the variable amplitude hinge point is upturned, the bottom part is a variable section, and the bottom joint is retracted, on the one hand, the assembly space is created for the variable amplitude cylinder 3, and on the other hand, the compressed main chord can be reduced. Length of 7, With other chord and web structure, the optimal truss structure is formed.

In the above-mentioned truss arm structure, the third connecting portion 26 of the rotating frame 2 is convexly convex and upturned, and the fourth connecting portion 27 is concave, so that the variable-width cylinder 3 is provided at the bottom to leave a space, thereby ensuring the stability of the truss arm structure connection. Give full play to the advantages of light weight, high strength and small wind load of the truss structure, and improve the overall hoisting performance.

The rotating frame 2 is a variable-section truss structure. The height, length and rear section size of the design are optimized at the same time to realize the truss structure of the rotating frame 2 as a whole. The joint between the bottom and the variable-speed cylinder 3 is closed. The lower convexity can reduce the length of the compressed main chord 7 and increase the critical force; the reasonable compression direction of the variable amplitude cylinder 3 and the optimal force arm design form a truss type force of the variable position of the pressure cylinder type truss arm structure.

Both the connecting frame 1 and the rotating frame 2 are truss structures, which makes the truss arm structure form a full truss structure, replacing the original steel plate box structure, fully utilizing the truss structure, light weight, high strength, small wind load, processing The process is simple and so on.

Further, the number of the variable amplitude cylinders 3 may be at least two, and the respective variable amplitude cylinders 3 are arranged side by side, so that the force is more stable.

The above technical solution is designed to be a semi-package compact structure with a double-fork connection of the oil cylinder and a single-point divergence connection with the seamless steel pipe, and the single-point divergent connection can distribute the pressure of the variable-range cylinder 3 to a plurality of non-distributed states. Sewed steel pipe, all seamless steel pipes are balanced and fully exerted the bearing capacity of all seamless steel pipes, which greatly enhances the stability of the structure. The structure is used as an effective joint form of the cylinder type truss arm, so that the variable amplitude cylinder 3 does not interfere with the joint when the variable amplitude cylinder 3 under pressure is changed, so that the joint has better strength and stability, and also makes the cylinder pressure It can be balancedly transmitted to the truss structure to avoid the phenomenon that the overall structure is partially stressed, and the overall performance of the boom is improved.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", The orientation or positional relationship of the "top", "bottom", "inside", "outside" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and a simplified description, rather than indicating or implying The device or component referred to must have a particular orientation, is constructed and operated in a particular orientation, and thus is not to be construed as limiting the scope of the invention.

It should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention and are not intended to be limiting thereof; although the present invention has been described in detail with reference to the preferred embodiments, It is to be understood that the specific embodiments of the present invention may be modified or equivalently substituted for the technical features of the present invention without departing from the spirit of the present invention.

Claims

A truss arm structure, comprising: a connecting frame (1), a rotating frame (2) and a variable amplitude cylinder (3); the connecting frame (1) is rotatably connected with the rotating frame (2) One end of the variable amplitude cylinder (3) is rotatably connected to the connecting frame (1), and the other end of the variable amplitude cylinder (3) is rotatably connected with the rotating frame (2); wherein the variable amplitude The cylinder (3) is under pressure.
The truss arm structure according to claim 1, characterized in that the connecting frame (1) comprises a first connecting portion (16) at the top and a second connecting portion (17) at the bottom, the rotating frame ( 2) comprising a third connection portion (26) at the top and a fourth connection portion (27) at the bottom; the first connection portion (16) and the third connection portion (26) are rotatably connected, The second connecting portion (17) and one end of the luffing cylinder (3) are rotatably connected, and the other end of the luffing cylinder (3) is rotatably connected to the fourth connecting portion (27);

When the truss arm structure is in a mounted state and laid flat, the first connecting portion (16) is located at a side of the second connecting portion (17) adjacent to the rotating frame (2), the third connecting portion (26) is located on a side of the fourth connecting portion (27) close to the connecting frame (1).
The truss arm structure according to claim 2, characterized in that the connecting frame (1) comprises a first joint (11) and a first tubular member (12), the first joint (11) being provided with a first connection a hole (13), the first connecting hole (13) as the first connecting portion (16), the number of the first pipe members (12) is at least two, and each of the first pipe members (12) One end is connected to the first joint (11), and the other end of each of the first tubular members (12) is for connecting with a telescopic arm.
The truss arm structure according to claim 3, wherein the first joint (11) comprises a first bent plate (14) and a first vertical plate (15), the first vertical plate (15) The number of the first vertical plates (15) is parallel to the concave side of the first bending plate (14), and each of the first vertical plates (15) is provided with the First connection hole (13).
The truss arm structure according to claim 3, characterized in that the other ends of the first tubular members (12) are separated from each other.
The truss arm structure according to claim 2, wherein the rotating frame (2) comprises a second joint (21) and a second tubular member (22), and the second joint (21) is provided with a second joint Hole (23), The second connecting hole (23) serves as the third connecting portion (26); the number of the second tubular members (22) is at least two, and one end of each of the second tubular members (22) is The second joint (21) is connected, and the other end of each of the second tubular members (22) is for connecting with the secondary arm.
The truss arm structure according to claim 6, wherein the other ends of the second tubular members (22) are separated from each other.
The truss arm structure according to claim 3, wherein the second joint (21) comprises a second bent plate (24) and a second vertical plate (25), and the second vertical plate (25) The number of the second vertical plates (25) is parallel to the concave side of the second bending plate (24), and each of the second vertical plates (25) is provided with the The second connection hole (23).
The truss arm structure according to claim 1, characterized in that the top of the connecting frame (1) has an isometric structure; and/or the bottom of the connecting frame (1) has a variable cross-sectional structure.
The truss arm structure according to claim 1, characterized in that the rotating frame (2) as a whole has a variable cross-sectional structure.
The truss arm structure according to claim 1, characterized in that the number of the variet cylinders (3) is at least two, and each of the slewing cylinders (3) is arranged side by side.
A crane comprising the truss arm structure of any of claims 1-11.