CN109110658B - Eight-chord arm support - Google Patents

Abstract

The invention discloses an eight-chord arm frame, which belongs to the field of crane transportation machinery. In the eight-chord jib, based on two symmetrically arranged root boxes arranged at the root of the jib and four jib legs respectively arranged at the four corners of the two root boxes, the middle part of the jib includes The eight main chords are coaxially connected with the four jib legs on the two root boxes respectively, and the connection between the middle part of the jib and the head chord at the head of the jib is realized through the front box at the front of the jib. connect. The symmetrically arranged connection structure of the eight-chord boom can not only realize the stable force transmission, but also make the eight-chord boom have the same volume and weight as the original four-chord boom. The eight-chord jib can have a larger section moment of inertia than the four-chord jib, and can withstand the bending moment of a larger load. Compared with the four-chord jib, this eight-chord jib has a stronger anti-eccentric load capacity, and can effectively realize the lifting of heavy pile legs and other structures.

Description

An eight-chord arm

technical field

The invention relates to the field of crane transportation machinery, in particular to an eight-chord boom.

Background technique

The jib is an important part of the crane used to lift goods. The root of the jib is usually connected to the turntable of the crane. There is at least a lifting pulley on the jib. The lifting pulley is provided with a lifting wire rope connected to the winch at one end. The winch controls the retraction and release of the hoisting wire rope on the hoisting pulley to realize the lifting and lowering of the goods connected to the other end of the hoisting wire rope.

The jib of the existing cranes mostly adopts the four-chord jib, and the structure of the four-chord jib mainly includes four main chords arranged side by side, and a plurality of supporting webs arranged between the four main chords. Rod and the jib head set at one end of the four main chords for installing hoisting pulleys and other structures.

But the anti-offset load capability of the four-chord jib of this structure is relatively weak. The first hoisting steel wire rope is connected near the two ends of the pile leg. After the pile leg is lifted horizontally, the two lifting wire ropes connected to the pile leg are recovered and released respectively, and the pile leg is placed vertically. During this process, the boom will bear a large partial load, and the structure of the four-chord boom may be damaged due to excessive partial load.

Contents of the invention

An embodiment of the present invention provides an eight-chord jib. The eight-chord jib has a strong anti-eccentric load capability and can effectively lift structures such as heavy pile legs. Described technical scheme is as follows:

An embodiment of the present invention provides an eight-chord boom. The eight-chord boom includes a boom root, a boom middle, a boom front and a boom head connected in sequence. The boom root includes two A symmetrically arranged root box, a plurality of connecting rods are connected between the two root boxes, and four parallel jib legs are inserted at the four corners of each of the root boxes, and the root The length of the vertical line from the end of the jib root leg on the box close to the middle part of the jib to the symmetry axis of the two root boxes is smaller than the perpendicular line from the other end of the jib root leg to the symmetry axis length,

The middle part of the boom includes a first extension unit and a second extension unit, the first extension unit and the second extension unit have the same structure, and each of the first extension unit and the second extension unit includes four Main chords and multiple connection structures, the four main chords in the first extension unit are coaxially connected with the four jib legs on one of the root boxes, and the multiple connections The structure is arranged between two adjacent main chords, and the four main chords in the second extension unit are coaxial with the four jib legs on the other root box. connect,

The front part of the boom includes a front box, one end of the front box is connected to the main chord, and the boom head includes four head chords and head end plates, the four Two head chords are symmetrically arranged on both sides of the symmetry axis, one end of the four head chords is connected to the other end of the front box, and the other end of the four head chords One end is connected with the head end plate.

Optionally, a plurality of connection support structures are provided between the first extension unit and the second extension unit.

Optionally, each of the main chords includes a plurality of main chord units, the connecting support structure includes a box frame and eight intermediate links, and the box frame is provided with eight second through holes , the intermediate links are respectively inserted in the eight second through holes, and both ends of each of the intermediate links are coaxially connected to the main chord unit.

Optionally, the connection structure includes a plurality of support rods and a plurality of web members, and the plurality of support rods and the plurality of web members are arranged between two adjacent main chords, and each of the The supporting rods are all perpendicular to the main chords, and the webs between the two adjacent main chords are arranged end-to-end on the two adjacent main chords.

Optionally, an intersectoral plate is provided at the connection between each web member and the main chord, and an insertion hole is arranged on the intersecting plate, and the main chord is arranged in the insertion hole, so that Both ends of the web are fixed on the intersegmental plate.

Optionally, the webs on the two adjacent main chords on the side close to the axis of symmetry cross the webs on the two adjacent main chords on the side away from the axis of symmetry.

Optionally, two main lifting lugs for installing the main lifting pulley are arranged on the front box, and the two main lifting lugs are arranged on both sides of the axis of symmetry. The distances from the two main lifting lugs to the axis of symmetry are different.

Optionally, the structure of the head end plate is symmetrical about the axis of symmetry, one end of the head end plate is connected to the four head chords, and the cross-sectional area of the head end plate is close to the One end of the front part of the boom gradually narrows toward the other end.

Optionally, the other end of the head end plate is provided with an auxiliary lifting lug for installing the auxiliary lifting pulley, and the auxiliary lifting lug is arranged at the other end of the four head chords.

Optionally, each of the root boxes is provided with transverse ribs and longitudinal ribs.

The beneficial effects brought by the technical solution provided by the embodiment of the present invention are: in the eight-chord jib, the two symmetrically arranged root boxes arranged at the root of the jib and the four corners of the two root boxes respectively arranged Based on the four jib legs, the eight main chords included in the middle of the jib are respectively coaxially connected with the four jib legs on the two root boxes, and passed through the front box at the front of the jib Realize the connection between the middle part of the boom and the head chord at the head of the boom. The symmetrically arranged connection structure of the eight-chord boom can not only realize the stable force transmission, but also make the eight-chord boom have the same volume and weight as the original four-chord boom. The eight-chord jib can have a larger section moment of inertia than the four-chord jib, and can withstand the bending moment of a larger load. Compared with the four-chord jib, this eight-chord jib has a stronger anti-eccentric load capacity, and can effectively realize the lifting of heavy pile legs and other structures.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings that need to be used in the description of the embodiments,

Fig. 1 is a schematic structural view of an eight-chord jib provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of the connection between the front part of the boom and the head of the boom provided by the embodiment of the present invention;

Fig. 3 is a top view of an eight-chord boom provided by an embodiment of the present invention;

Fig. 4 is a schematic diagram of a rotating connection structure provided by an embodiment of the present invention;

Fig. 5 is a schematic structural view of the root of the boom provided by the embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a connection structure provided by an embodiment of the present invention;

Fig. 7 is a top view of the connection structure provided by the embodiment of the present invention;

Fig. 8 is a top view of the connection support structure provided by the embodiment of the present invention;

Fig. 9 is a structural schematic diagram of a connection support structure provided by an embodiment of the present invention;

Fig. 10 is a schematic structural view of the front part of the jib provided by the embodiment of the present invention;

Fig. 11 is a schematic structural view of the head end plate provided by the embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Fig. 1 is a schematic structural diagram of an eight-chord boom provided by an embodiment of the present invention. As shown in Figure 1, the eight-chord jib includes a jib root 1, a jib middle 2, a jib front 3, and a jib head 4 connected in sequence, and the jib root 1 includes two symmetrically arranged root boxes body 11, a plurality of connecting rods 12 are connected between the two root boxes 11, four parallel jib legs 13 are inserted at the four corners of each root box 11, and the jibs on the root box 11 The length of the perpendicular from one end of the root leg 13 close to the middle part 2 of the jib to the axis of symmetry a of the two root boxes 11 is smaller than the length of the perpendicular from the other end of the root leg 13 of the jib to the axis of symmetry a.

The boom middle part 2 includes a first extension unit 21 and a second extension unit 22 , and the first extension unit 21 and the second extension unit 22 have the same structure. Both the first extension unit 21 and the second extension unit 22 include four main chords 211 and a plurality of connecting structures 212, the four main chords 211 in the first extension unit 21 and the four main chords 211 on one of the root boxes 11 The root legs 13 of the jib are connected coaxially one by one, and a plurality of connection structures 212 are arranged between two adjacent main chords 211, and the four main chords 211 in the second extension unit 22 are connected with another root box The four jib legs 13 on 11 are coaxially connected in one-to-one correspondence.

Figure 2 is a schematic diagram of the connection between the front part of the boom and the head of the boom provided by the embodiment of the present invention. Combining Figure 1 and Figure 2, the front part 3 of the boom includes a front box 31, one end of the front box 31 is connected The chords 211 are connected. The boom head 4 includes four head chords 41 and head end plates 42. The four head chords 41 are symmetrically arranged on both sides of the symmetry axis a. The four head chords One end of 41 is connected with the other end of front box body 31, and the other end of four head chords 41 is connected with head end plate 42.

In the eight-chord jib, based on two symmetrically arranged root boxes 11 arranged at the root of the jib 1 and four jib legs 13 respectively arranged at the four corners of the two root boxes 11, the arm The eight main chords 211 included in the middle part 2 of the boom are connected coaxially with the four boom legs 13 on the two root boxes 11 respectively, and the middle part 2 of the boom is realized through the front box 31 of the front part 3 of the boom. Connection with the head chord 41 of the jib head 4. The symmetrically arranged connection structure 212 of the eight-chord jib can not only realize the stable transmission of force, but also make the volume and weight of the eight-chord jib similar to that of the original four-chord jib. , the eight-chord jib can have a larger section moment of inertia than the four-chord jib, and can withstand a greater load of bending moment. Compared with the four-chord jib, this eight-chord jib has a stronger anti-eccentric load capacity, and can effectively realize the lifting of heavy pile legs and other structures.

Fig. 3 is a top view of an eight-chord jib provided by an embodiment of the present invention. As shown in Fig. 3 , each root box 11 can be provided with a rotating connection structure 111, and the eight-chord jib is connected to the crane. When on the turntable of the crane, the eight-chord jib can be connected to the turntable of the crane by rotating the connecting structure 111.

Fig. 4 is a schematic diagram of a rotating connection structure provided by an embodiment of the present invention. As shown in Fig. 4 , the rotating connection structure 111 may include a connecting piece 111a and a fixing piece 111b, and the fixing piece 111b is arranged between the connecting piece 111a and the root box 11 , the connecting piece 111a can be connected to the double lug structure 5 on the turntable of the crane through a pin shaft, and the thickness of the connecting piece 111a is smaller than that of the fixing piece 111b. This structure can realize the connection between the eight-chord jib and the crane with a relatively simple structure.

Fig. 5 is a schematic structural diagram of the root of the boom provided by the embodiment of the present invention. As shown in Fig. 5, the connecting rod 12 between the two root boxes 11 can be parallel to the symmetry axis a of the two root boxes 11, and each root The boxes 11 are provided with first through holes 11 a for inserting the jib root legs 13 , so as to realize the fixing and installation of the jib root legs 13 on the root box body 11 .

Optionally, a plurality of fixed rods 14 can be added between two adjacent connecting rods 12, and the fixed rods 14 are connected end-to-end between two adjacent connecting rods 12 to increase the The strength of the eight-chord jib.

As shown in FIG. 5 , each root box 11 is provided with a transverse rib 15 and a longitudinal rib 16 . The arrangement of the transverse ribs 15 and the longitudinal ribs 16 can increase the overall strength of the boom root 1 .

FIG. 6 is a schematic structural diagram of a connection structure provided by an embodiment of the present invention. As shown in FIG. 6 , the connection structure 212 includes a plurality of support rods 212a and a plurality of web rods 212b. A plurality of support rods 212a and a plurality of web members 212b are arranged between two adjacent main chords 211, each support rod 212a is perpendicular to the main chord 211, and the distance between the adjacent two main chords 211 The web members 212b are arranged end-to-end on two adjacent main chord members 211 . Connecting the four main chords 211 on one side of the axis of symmetry a with the support rods 212a and the webs 212b can avoid material waste while ensuring the structural stability of the eight-chord jib.

As shown in Figure 6, the webs 212b on the two adjacent main chords 211 on the side close to the axis of symmetry a and the webs 212b on the two adjacent main chords 211 on the side away from the axis of symmetry a 212b cross setting. This arrangement can prevent three or more webs 212b from being connected to the same point of the main chord 211, which can ensure the structural stability of the eight-chord jib and facilitate the manufacture of the eight-chord jib.

Fig. 7 is a top view of the connection structure provided by the embodiment of the present invention. As shown in Fig. 7, an internode plate 23 is provided at the connection between each web 212b and the main chord 211, and an insertion hole is arranged on the intersection plate 23. The main chord 211 is arranged in the socket, and both ends of the web 212 b are fixed on the internode plate 23 . The connection between the web member 212b and the main chord 211 is realized through the intersecting plate 23, which can ensure the strength of the main chord 211, prevent the strength of the main chord 211 from being affected and ensure the overall stability of the eight-chord jib.

Optionally, an internode plate 23 may also be provided between the support rod 212a and the main chord 211, which is not limited in the present invention.

As shown in FIG. 1 , a plurality of connection support structures 24 are also provided between the first extension unit 21 and the second extension unit 22 . A plurality of connection support structures 24 arranged between the first extension unit 21 and the second extension unit 22 can increase the stability of the first extension unit 21 and the second extension unit 22, and the eight-chord jib can withstand larger The bending moment increases the anti-eccentric load capacity of the eight-chord jib.

Fig. 8 is a top view of the connection support structure provided by the embodiment of the present invention, and Fig. 9 is a structural schematic diagram of the connection support structure provided by the embodiment of the present invention. Combining Fig. 8 and Fig. 9, each main chord 211 includes coaxially arranged A plurality of main chord units 211a, the connecting support structure 24 includes a box frame 241 and eight intermediate links 242, the box frame 241 is provided with eight second through holes 241a, and the intermediate links 242 are respectively inserted in eight In the second through hole 241a, two ends of each intermediate link 242 are respectively coaxially connected to the main chord unit 211a. The connecting support structure 24 of this structure is used to connect the first extension unit 21 and the second extension unit 22, which can facilitate the overall disassembly and assembly of the eight-chord arm frame while ensuring the structural strength of the eight-chord arm frame.

Optionally, in the embodiment of the present invention, the connection support structure 24 can be arranged at the connection between the boom root 1 and the boom middle part 2, and at the same time, the connection support structure 24 can also be arranged at the boom front part 3 and the boom middle part 2 to further increase the strength of the eight-chord jib.

Fig. 10 is a structural schematic diagram of the front part of the jib provided by the embodiment of the present invention. As shown in Fig. 10, two main lifting lugs 32 for installing the main lifting pulley are arranged on the front box body 31, two The main lifting lugs 32 are arranged on both sides of the symmetry axis a, and the distances from the two main lifting lugs 32 to the symmetry axis a are different. The distance from the two main lifting lugs 32 to the axis of symmetry a can be determined according to the eccentric load of the goods that the crane actually needs to lift. This setting can further reduce the eccentric load that will occur when the eight-chord jib lifts the goods conditions, to ensure the stability of the eight-chord boom.

As shown in FIG. 10 , two luffing lugs 33 for installing luffing pulleys can also be arranged on the front box body 31 , and the two luffing lugs 33 are symmetrically arranged on both sides of the symmetry axis a.

Optionally, an angle steel 34 may be provided on the inner wall of the front box body 31 to increase the stability of the eight-chord jib.

Further, a plurality of web bars 212b may also be arranged in the box frame 241, which is not limited in the present invention.

Fig. 11 is a schematic structural view of the head end plate provided by the embodiment of the present invention. As shown in Fig. 11, the structure of the head end plate 42 is symmetrical about the axis of symmetry a, and one end of the head end plate 42 is connected to four head chords 41 Connected, the cross-sectional area of the head end plate 42 gradually decreases from one end close to the front part 3 of the jib to the other end. This arrangement can increase the overall length of the eight-chord jib and increase the versatility of the eight-chord jib without increasing excessive material costs.

Optionally, multiple webs 212b are connected between the four head chords 41 to increase the strength of the eight-chord jib.

As shown in FIG. 11 , the other end of the head end plate 42 is provided with an auxiliary lifting lug 43 for installing the auxiliary lifting pulley, and the auxiliary lifting lug 43 is arranged on the other end of the four head chords 41 . The arrangement of auxiliary lifting lugs 43 can satisfy the lifting of goods with no unbalanced load or less unbalanced load. Increase the versatility of the eight-chord jib.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention Inside.

Claims (8)

1. An eight-chord arm support is characterized by comprising an arm support root, an arm support middle part, an arm support front part and an arm support head part which are sequentially connected, wherein the arm support root comprises two symmetrically arranged root box bodies, a plurality of connecting rods are connected between the two root box bodies, four parallel arm support root legs are inserted at the four corners of each root box body, the length of a perpendicular line from one end of the arm support root leg on the root box body, which is close to the arm support middle part, to a symmetric axis of the two root box bodies is smaller than the length of a perpendicular line from the other end of the arm support root leg to the symmetric axis,

The middle part of the arm support comprises a first extension unit and a second extension unit, the first extension unit and the second extension unit have the same structure, the first extension unit and the second extension unit respectively comprise four main chords and a plurality of connecting structures, the four main chords in the first extension unit are coaxially connected with the four arm support root legs on one root box body in a one-to-one correspondence manner, the plurality of connecting structures are arranged between the two adjacent main chords, the four main chords in the second extension unit are coaxially connected with the four arm support root legs on the other root box body in a one-to-one correspondence manner,

A plurality of connecting and supporting structures are arranged between the first extending unit and the second extending unit, each main chord comprises a plurality of main chord units, each connecting and supporting structure comprises a box body frame and eight middle link rods, eight second through holes are arranged on the box body frame, the middle link rods are respectively inserted into the eight second through holes, two ends of each middle link rod are respectively coaxially connected with the main chord units,

The front part of the arm support comprises a front box body, one end of the front box body is connected with the main chord, the head part of the arm support comprises four head chord members and a head end plate, the four head chord members are arranged on two sides of the symmetry axis in a pairwise symmetry manner, one ends of the four head chord members are connected to the other end of the front box body, and the other ends of the four head chord members are connected with the head end plate.

2. The eight-chord arm support according to claim 1, wherein the connecting structure comprises a plurality of support rods and a plurality of web members, the plurality of support rods and the plurality of web members are disposed between two adjacent main chords, each support rod is perpendicular to the main chords, and the web members between two adjacent main chords are disposed end to end on the two adjacent main chords.

3. The eight-chord arm support according to claim 2, wherein each web member is connected to the main chord member by an internode plate, the internode plate is provided with a jack, the main chord member is arranged in the jack, and both ends of the web member are fixed on the internode plate.

4. The eight-chord arm support according to claim 2, wherein the web members of two adjacent main chords on the side close to the symmetry axis are arranged crosswise to the web members of two adjacent main chords on the side far from the symmetry axis.

5. The eight-chord arm support according to any one of claims 1 to 4, wherein two main lifting lug plates for mounting main lifting pulleys are arranged on the front box body, the two main lifting lug plates are arranged on two sides of the symmetry axis, and the distances from the two main lifting lug plates to the symmetry axis are different.

6. The eight-chord arm support according to any one of claims 1 to 4, wherein the structure of the head end plate is symmetrical about the symmetry axis, one end of the head end plate is connected with the four head chords, and the cross-sectional area of the head end plate is gradually reduced from one end close to the front part of the arm support to the other end.

7. the eight-chord arm support according to claim 6, wherein the other end of the head end plate is provided with an auxiliary lifting lug plate for mounting an auxiliary lifting pulley, and the auxiliary lifting lug plate is arranged at the other end of the four head chords.

8. The eight-chord arm support according to any one of claims 1 to 4, wherein each root box is internally provided with a transverse rib plate and a longitudinal rib plate.