CN111348567A - Truss arm and engineering vehicle - Google Patents

Abstract

The invention provides a truss arm and an engineering vehicle, and belongs to the technical field of engineering vehicles. A truss arm comprising: the cantilever crane comprises a cantilever crane body which is of a truss structure, wherein the cantilever crane body comprises four main chord tubes forming a rectangle and a plurality of web tubes arranged between two adjacent main chord tubes, a long pull plate parallel to the main chord tubes is arranged on one side of the cantilever crane body, the long pull plate is arranged on the outer side of the cantilever crane body, the long pull plate is fixed with the plurality of web tubes through a pull plate support, and the pull plate support is arranged on the web tubes. A working vehicle comprises the truss arm. The invention can improve the single transportation amount, thereby reducing the transportation cost.

Description

Truss arm and engineering vehicle

Technical Field

The invention relates to the technical field of engineering vehicles, in particular to a truss arm and an engineering vehicle.

Background

Engineering vehicles are an important component of the equipment industry. Such as a crawler crane, which is a machine that travels with tracks for lifting and hoisting. The truss arm in the crawler crane is a core component determining the load capacity of the crawler crane, and the truss arm is composed of a plurality of sections of arm frames, for example, the number of the arm frames of the crawler crane with ultra-large tonnage (more than 3000 tons) is fifty sections or even sixty sections. The arm support is carried to a construction site through the transport vehicle for assembly operation, and more transport vehicles are needed for carrying the arm support with more quantity, so that the transport cost is higher.

In order to reduce the transportation cost, two methods are used for carrying the arm support in the prior art, one method is to stack the arm support in double rows and double columns on a transport vehicle, but the method is only suitable for the arm support with smaller section width, and the other method is to form a secondary sleeving manner by utilizing the internal space of the arm support, namely, the arm support with a large section is sleeved on the arm support with a small section, and the transportation cost can not be further reduced because the structure of the arm support is limited and can only meet the form of the secondary sleeving manner.

Disclosure of Invention

The invention aims to provide a truss arm and an engineering vehicle, which can improve the single transportation amount and reduce the transportation cost.

The embodiment of the invention is realized by the following steps:

in one aspect of the embodiments of the present invention, there is provided a truss arm including: the cantilever crane comprises a cantilever crane body which is of a truss structure, wherein the cantilever crane body comprises four main chord tubes forming a rectangle and a plurality of web tubes arranged between two adjacent main chord tubes, a long pull plate parallel to the main chord tubes is arranged on one side of the cantilever crane body, the long pull plate is arranged on the outer side of the cantilever crane body, the long pull plate is fixed with the plurality of web tubes through a pull plate support, and the pull plate support is arranged on the web tubes.

Optionally, the arm-tie support includes two limiting plates of parallel arrangement and sets up the backup pad between two limiting plates, limiting plate one end and backup pad fixed connection, still is provided with first locating part at the other end of limiting plate, and first locating part, two limiting plates and backup pad enclose to close and form hollow structure, and long arm-tie is inserted and is located hollow structure.

Optionally, the first limiting part is a bolt, first through holes are respectively formed in one ends, deviating from the supporting plate, of the two limiting plates, and the bolt sequentially penetrates through the first through holes in the two limiting plates.

Optionally, the first limiting part comprises a lock rod and a lock catch corresponding to the lock rod, one end of the lock rod is rotatably arranged at one end of one limiting plate departing from the supporting plate, the lock catch is arranged at one end of the other limiting plate departing from the supporting plate, and the other end of the lock rod can be clamped in the lock catch.

Optionally, the truss arm further comprises a short pulling plate, the short pulling plate is connected with the long pulling plate through a fastener, second through holes are formed in two ends of the short pulling plate respectively, a third through hole is formed in the end portion of the long pulling plate, and the fastener sequentially penetrates through the second through hole in the short pulling plate and the third through hole in the long pulling plate.

Optionally, the truss arm further includes a second limiting member, the second limiting member includes a protruding portion disposed at an end of the long pulling plate and a limiting rod disposed on the short pulling plate, the limiting rod is disposed on a connecting line of the two second through holes, and when the short pulling plate is connected to and parallel to the long pulling plate, the limiting rod abuts against the protruding portion.

Optionally, the truss arm further comprises a nylon cushion block rotatably arranged on the wall of the main chord tube, and the nylon cushion block and the long pulling plate are arranged on the same side.

Optionally, a positioning piece is arranged on the abdominal tube, a groove is formed in one side, connected with the positioning piece, of the nylon cushion block, fourth through holes are formed in two sides of the positioning piece, fifth through holes are formed in the nylon cushion block, and the positioning piece sequentially penetrates through the fourth through holes in the positioning piece and the fifth through holes in the nylon cushion block through positioning pins to enable the nylon cushion block to be fixed to the main chord tube.

Optionally, the truss arm further comprises a transportation assembly, the transportation assembly comprises a transportation gasket and a sleeving pulley, the transportation gasket and the sleeving pulley are arranged on a belly pipe on one side, away from the long pulling plate, of the arm support body, the transportation gasket is arranged on the outer side of the arm support body, and the sleeving pulley is arranged on the inner side of the arm support body.

In another aspect of the embodiments of the present invention, there is provided an engineering vehicle, including: a plurality of truss arms as described in any of the above.

The embodiment of the invention has the beneficial effects that:

according to the truss arm provided by the embodiment of the invention, the pull plate support is arranged on the web pipe, so that the height of the arm support body is reduced, and the arm support body is sleeved in three stages. Specifically, the truss arm includes the boom support body for truss structure, truss structure comprises four main chord pipes that form the rectangle and the many belly pipes of setting between two adjacent main chord pipes, wherein, the diameter of main chord pipe is greater than the diameter of belly pipe, still include and be provided with the long arm-tie parallel with main chord pipe in boom body one side, long arm-tie passes through the arm-tie support and fixes the outside at the boom support body with many belly pipes respectively, the arm-tie support sets up on the belly pipe, the arm-tie support is by moving to the belly pipe from the main chord pipe on, can effectively reduce the overall height of boom support body, make truss structure can realize the purpose of tertiary suit, thereby can reduce the cost of transportation of truss arm.

The engineering vehicle provided by the embodiment of the invention adopts the truss arm, and three-level sleeving is realized through the arm support body, so that the transportation cost of the truss arm is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a truss arm according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a tie plate support in a truss arm according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a partially enlarged structure of a region A in FIG. 1 according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a partially enlarged structure of a region B in FIG. 1 according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a partially enlarged structure of a region C in FIG. 1 according to an embodiment of the present invention;

FIG. 6 is a schematic structural view of a three-level truss arm nest provided by an embodiment of the invention;

fig. 7 is a schematic structural diagram of a plurality of truss arm stacks according to an embodiment of the present invention.

Icon: 10-a main chord tube; 11-a positioning element; 20-abdominal tube; 30-long pulling plate; 31-a third via; 32-a projection; 40-a tie plate support; 41-a limiting plate; 42-a support plate; 43-first stop; 51-sleeving a pulley; 52-transport pads; 60-short pulling plate; 61-a second via; 62-a limiting rod; 70-nylon cushion blocks; 71-positioning pin.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "first", "second", "third", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Fig. 1 is a schematic structural diagram of a truss arm according to an embodiment of the present invention, and referring to fig. 1, an embodiment of the present invention provides a truss arm, including: the cantilever crane body is of a truss structure and comprises four main chord tubes 10 forming a rectangle and a plurality of web tubes 20 arranged between two adjacent main chord tubes 10, a long pulling plate 30 parallel to the main chord tubes 10 is arranged on one side of the cantilever crane body, the long pulling plate 30 is arranged on the outer side of the cantilever crane body, the long pulling plate 30 is fixed with the web tubes 20 through a pulling plate support 40, and the pulling plate support 40 is arranged on the web tubes 20.

The truss in the truss structure is referred to as a truss beam and is a lattice-structured beam structure. All member pieces in the truss structure are stressed mainly by unidirectional pulling and pressing, and the truss structure can adapt to the distribution of bending moment and shearing force in the structure by reasonable arrangement of the upper and lower chords and the web members. Because the pulling and pressing internal forces in the horizontal direction realize self balance, the whole structure does not generate horizontal thrust to the support. The structure is arranged flexibly, and the application range is very wide.

It should be noted that, first, the main chord 10 and web 20 tubes are hollow, in order to reduce the overall mass of the truss arm. The web member 20 includes a straight web member and an oblique web member, the straight web member is disposed between the adjacent main chords 10 and the extending direction of the straight web member is perpendicular to the extending direction of the main chords 10, and the oblique web member is disposed between the adjacent main chords 10 and the extending direction of the oblique web member is not perpendicular to the extending direction of the main chords 10, but has a certain included angle. Illustratively, the web pipes 20 on one side of the arm support body are straight web pipes, the web pipes 20 on the adjacent side are oblique web pipes, and two adjacent oblique web pipes and the main chord pipe 10 form a triangular frame, so that the truss structure is more stable.

Second, the long pulling plate 30 is provided at one side of the boom body and fixed with the belly tube 20 by the pulling plate holder 40. Illustratively, the diameter of the main chord 10 is larger than that of the web pipes 20, and the plurality of main chord pipes 10 are provided with receiving hole sites, so that both ends of the plurality of web pipes 20 are respectively inserted into the receiving sites of two adjacent main chord pipes 10 to form a truss structure, two long pulling plates 30 are respectively arranged on one side of the truss structure, and the extending direction of the two long pulling plates 30 is the same as the stretching direction of the main chord pipes 10.

The tie plate holder 40 may have various structures, for example, the tie plate holder 40 is a connecting plate with a groove formed therein, the long tie plate 30 is disposed in the groove, and a stopper is disposed at the top of the groove for fixing the long tie plate 30 to prevent the long tie plate 30 from falling off during movement or operation, and the connecting plate is fixed to the abdominal tube 20 by bolts or welding.

Referring to fig. 6, the diameter of the main chord tube 10 is greater than that of the web tube 20, and therefore, the tie plate support 40 is disposed on the web tube 20, so that the height of the boom body is reduced as a whole, and the boom body can be nested in three stages.

According to the truss arm provided by the embodiment of the invention, the pull plate support 40 is arranged on the web pipe 20, so that the height of the arm support body is reduced, and the arm support body is sleeved in three stages. Specifically, the truss arm comprises an arm frame body which is of a truss structure, wherein the truss structure is composed of four main chord tubes 10 forming a rectangle and a plurality of web tubes 20 arranged between two adjacent main chord tubes 10, the diameter of each main chord tube 10 is larger than that of each web tube 20, a long pulling plate 30 parallel to the main chord tubes 10 is arranged on one side of the arm frame body, the long pulling plate 30 is fixed on the outer side of the arm frame body through a pulling plate support 40 and the plurality of web tubes 20 respectively, the pulling plate support 40 is arranged on the web tubes 20, and the pulling plate support 40 is moved onto the web tubes 20 from the main chord tubes 10, so that the overall height of the arm frame body can be effectively reduced, the truss structure can achieve the purpose of three-level sleeving, and the transportation cost of the truss arm can be reduced.

Fig. 2 is a schematic structural diagram of a tie plate support in a truss arm according to an embodiment of the present invention, please refer to fig. 2, optionally, the tie plate support 40 includes two limiting plates 41 arranged in parallel and a supporting plate 42 arranged between the two limiting plates 41, one end of the limiting plate 41 is fixedly connected to the supporting plate 42, the other end of the limiting plate 41 is further provided with a first limiting member 43, the two limiting plates 41 and the supporting plate 42 are enclosed to form a hollow structure, and the long tie plate 30 is inserted into the hollow structure.

Wherein, two limiting plates 41 are respectively fixed with backup pad 42 and set up, perhaps two limiting plates 41 are respectively with backup pad 42 integrated into one piece, and backup pad 42 one side is fixed on binder 20, perhaps two limiting plates 41 are fixed and are set up on binder 20, do not carry out the shape to the backup pad 42 and limiting plate 41 here and prescribe a limit to, and the technical staff in the art corresponds the setting according to the concrete design requirement. The tie plate holder 40 is not limited to the shape in the present embodiment.

Illustratively, one end of each of the two limiting plates 41 is fixedly connected to the abdominal tube 20, the surface of the supporting plate 42 is close to the wall of the abdominal tube 20, the long pulling plate 30 is placed between the two limiting plates 41 and supported by the supporting plate 42, and then the first limiting member 43 disposed at the other end of the two limiting plates 41 is fastened, so that the long pulling plate 30 is disposed in a hollow structure surrounded by the first limiting member 43, the two limiting plates 41, and the supporting plate 42.

Fig. 3 is a schematic view of a partially enlarged structure of the area a in fig. 1 according to an embodiment of the present invention, referring to fig. 3, optionally, the first limiting members 43 are bolts, first through holes are respectively formed at one ends of the two limiting plates 41 away from the supporting plate 42, and the bolts sequentially penetrate through the first through holes on the two limiting plates 41.

Illustratively, the strap support 40 is fixedly disposed on the web member 20, wherein the strap support 40 is fixedly disposed on the web member 20 in two manners, one is to fixedly dispose the support plate 42 on the web member 20, the other is to fixedly dispose one end of the two limit plates 41 on the web member 20, both manners are possible, then the long strap 30 is placed between the two limit plates 41 and supported by the support plate 42, and finally the bolt is sequentially inserted into the first through holes disposed on the two limit plates 41, so as to fix the long strap 30 on the strap support 40, that is, the long strap 30 is fixed on the web member 20 by the strap support 40.

The above description provides one structure of the first limiting member 43, and optionally, provides a second structural form of the first limiting member 43, where the first limiting member 43 includes a lock rod and a lock catch corresponding to the lock rod, one end of the lock rod is rotatably disposed at one end of one of the limiting plates 41 departing from the supporting plate 42, the lock catch is disposed at one end of the other limiting plate 41 departing from the supporting plate 42, and the other end of the lock rod can be clamped in the lock catch.

Illustratively, one end of each of two limiting plates 41 is fixed on the abdominal tube 20, the other end of each of the two limiting plates 41 is provided with a first limiting member 43, one of the limiting plates 41 is provided with a lock bar away from the supporting plate, the lock bar can have various shapes and structures, for example, a round bar, a square bar or a triangular bar, and the other end of each of the limiting plates 41 is provided with a lock catch corresponding to the lock bar, and when the lock bar contacts the lock catch, the lock catch can lock.

Referring to fig. 3, optionally, the truss arm further includes a short pulling plate 60, the short pulling plate 60 is connected to the long pulling plate 30 through a fastener, two ends of the short pulling plate 60 are respectively provided with a second through hole 61, an end of the long pulling plate 30 is provided with a third through hole 31, and the fastener sequentially passes through the second through hole 61 on the short pulling plate and the third through hole 31 on the long pulling plate 30.

It should be noted that the shapes of the plate surfaces of the short pulling plates 60 may be various, such as a square shape, an arc shape, a gourd shape, etc., and the shapes of the plate surfaces at the two ends of the long pulling plate 30 may also be various, such as a square shape, an arc shape, a gourd shape, etc., which will not be described herein in detail.

Illustratively, the plate surfaces at the two ends of the long pulling plate 30 are arc-shaped, the plate surfaces at the two ends of the short pulling plate 60 are arc-shaped, the plate surfaces at the two ends of the long pulling plate 30 are provided with third through holes 31, the plate surfaces at the two ends of the short pulling plate 60 are provided with second through holes 61, wherein the third through holes correspond to the second through holes 61, the fastener enables the long pulling plate 30 to be connected with the short pulling plate 60 by penetrating through the second through holes 61 and the third through holes 31, the better the connection effect of the long pulling plate 30 and the short pulling plate 60 is, the longer the service life of the truss arm is, the higher the safety is.

Referring to fig. 3, in order to further improve the connection effect between the long pulling plate 30 and the short pulling plate 60, optionally, in this embodiment, the truss arm further includes a second limiting member, the second limiting member includes a protruding portion 32 disposed at an end of the long pulling plate 30 and a limiting rod 62 disposed on the short pulling plate 60, the limiting rod 62 is disposed on a connecting line of the two second through holes 61, and when the short pulling plate 60 is connected and parallel to the long pulling plate 30, the limiting rod 62 abuts against the protruding portion 32.

It should be noted that, in order to prevent the short pulling plate 60 from swinging due to suspension, the second limiting member is designed to provide a stable stress point for the short pulling plate 60 and ensure the stability of the short pulling plate 60, and the second limiting member is not limited to the structure in the embodiment, and those skilled in the art should know.

In the process of installing the short pulling plate 60, when the second through hole 61 on the short pulling plate 60 and the third through hole 31 on the long pulling plate 30 are fixed by the fastener, the arc-shaped plate surface at one end of the long pulling plate 30 coincides with the arc-shaped plate surface at one section of the short pulling plate 60, so that the interference of the arc surface between the long pulling plate 30 and the short pulling plate 60 is avoided, and when the plate surface extending directions of the short pulling plate 60 and the long pulling plate 30 are parallel, the protruding part 32 on the long pulling plate 30 can just abut against the limiting rod 62 arranged on the short pulling plate 60, so that the connecting line of two stress points, namely the second through hole 61 and the limiting rod 62, on the short pulling plate 60 is the same as the extending direction of the long pulling plate 30, and the short pulling plate 60 is prevented from shaking.

Fig. 4 is a schematic enlarged view of a part of the area B in fig. 1 according to an embodiment of the present invention, referring to fig. 4, optionally, the truss arm further includes a nylon spacer block 70 rotatably disposed on the pipe wall of the main chord 10, and the nylon spacer block 70 is disposed on the same side as the long tension plate 30.

Wherein, nylon cushion 70 is by a novel engineering plastics processing, and its compressive strength is high, and long service life can protect main chord 10 surface, avoids main chord 10 to appear the surface scotch when piling up or crushing etc..

It should be noted that the nylon spacer block 70 is detachably disposed on the main chord 10, and one side of the nylon spacer block 70 contacting with the main chord 10 is in a circular arc shape, the circular arc shape is disposed corresponding to the circular arc of the main chord 10, and the nylon spacer block 70 is used to stably stack the boom bodies together, so that the other side of the nylon spacer block 70 contacting with the main chord 10 is also in a circular arc shape corresponding to the main chord 10.

Referring to fig. 7, a plurality of truss arms form a three-stage nested structure, the three-stage nested structure is stacked together, a rotatable nylon spacer block 70 is disposed on the main chord tube 10, when a plurality of truss arms are required to be stacked on the truss arms, the nylon spacer block 70 is fixed on the main chord tube 10, and if the truss arms are not stacked, the nylon spacer block 70 can be removed or rotated to the other side of the truss arms. Because the two side surfaces of the nylon cushion block 70, which are in contact with the main chord tube 10, are arc surfaces corresponding to the tube wall of the main chord tube 10, the nylon cushion block 70 can also limit the main chord tube 10 in contact, so that the stacking of the plurality of arm support bodies is more stable. The use of the nylon spacers 70 also enables the originally line-contacted main chord 10 to be in surface contact, thereby reducing the stress concentration on the contact surface of the main chord 10 and protecting the main chord 10.

Referring to fig. 4, optionally, a positioning member is disposed on the belly tube 20, a groove is disposed on a side of the nylon cushion block 70 connected to the positioning member 11, fourth through holes are disposed on two sides of the positioning member 11, and a fifth through hole is disposed on the nylon cushion block 70, and a positioning pin 71 sequentially passes through the fourth through hole on the positioning member 11 and the fifth through hole on the nylon cushion block 70, so as to fix the nylon cushion block 70 on the main chord tube 10.

It should be noted that, the positioning member 11 is disposed on the main chord 10, the positioning member 11 is used to provide an installation position of the nylon cushion block 70, and the corresponding nylon cushion block 70 is correspondingly provided with a groove, so that the positioning member 11 can be inserted into the groove. The connection relationship between the nylon cushion block 70 and the main chord 10 is not limited to the connection structure in the embodiment, and may be other structures, which are not described herein in detail.

Fig. 5 is a schematic partial enlarged structural view of a region C in fig. 1 according to an embodiment of the present invention, please refer to fig. 5, where the truss arm optionally further includes a transportation assembly, the transportation assembly includes a transportation pad 52 and a sleeving pulley 51, the transportation pad 52 is disposed on the outer side of the arm frame body, and the sleeving pulley 51 is disposed on the inner side of the arm frame body, where the transportation pad 52 is disposed on the side of the arm frame body facing away from the long pulling plate 30.

It should be noted that the transportation pad 52 is provided to prevent the frame body from being squeezed during transportation, i.e. the transportation pad 52 is used to protect the belly tube 20 from being crushed or scratched during transportation. The sheathing pulley 51 facilitates the sliding of the boom body when forming the secondary sheathing or the tertiary sheathing.

For example, referring to fig. 6, the truss arm includes at least three arm support bodies, each of which is a main arm, an auxiliary arm, and a reinforcing arm, wherein the reinforcing arm is sleeved in the auxiliary arm, and the auxiliary arm is sleeved in the main arm. In the process that the auxiliary arm is sleeved by the reinforcing arm, the transportation gasket 52 on the reinforcing arm can protect the pipe wall of the abdominal pipe 20 from being damaged, and the sliding friction between the reinforcing arm and the auxiliary arm is changed into rolling friction by the sleeved pulley 51 in the auxiliary arm, so that the pipe wall of the abdominal pipe 20 can be protected from being damaged while the sleeving process or the sleeving structure is cancelled.

In this embodiment, the strap mount 40 is disposed on the web member 20, so that the overall height of the boom body can be reduced, the truss arm can be nested in three stages, and the transportation cost can be reduced. And the nylon cushion blocks 70 are arranged on the main chord tube 10, so that when a plurality of truss arms are stacked together, the main chord tube 10 is prevented from being damaged, the stability of the stacked truss arms can be ensured, and safety accidents are avoided.

According to another aspect of the embodiment of the invention, an engineering vehicle is provided, which comprises the truss arm.

Because the truss arm of this application can realize tertiary suit, consequently engineering vehicle is suitable for the truss arm that provides in this application and can effectively reduce the cost of transportation to the truss arm, owing to set up nylon cushion 70 on the main chord 10 of cantilever crane body, can realize piling up of multilayer cantilever crane body again to reduce the storage yard space that the truss arm occupy.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A truss arm, comprising: the cantilever crane comprises a cantilever crane body, wherein the cantilever crane body is of a truss structure and comprises four main chord tubes forming a rectangle and a plurality of web pipes arranged between the two adjacent main chord tubes, one side of the cantilever crane body is provided with a long pulling plate parallel to the main chord tubes, the long pulling plate is arranged on the outer side of the cantilever crane body, the long pulling plate is respectively fixed with the web pipes through a pulling plate support, and the pulling plate support is arranged on the web pipes.

2. The truss arm according to claim 1, wherein the tie plate support comprises two parallel limiting plates and a supporting plate disposed between the two limiting plates, one end of each limiting plate is fixedly connected to the supporting plate, the other end of each limiting plate is further provided with a first limiting member, the two limiting plates and the supporting plate enclose a hollow structure, and the long tie plate is inserted into the hollow structure.

3. The truss arm according to claim 2, wherein the first position-limiting member is a bolt, and first through holes are respectively formed at ends of the two position-limiting plates away from the supporting plate, and the bolt sequentially penetrates through the first through holes of the two position-limiting plates.

4. The truss arm of claim 2, wherein the first limiting member comprises a lock rod and a lock catch corresponding to the lock rod, one end of the lock rod is rotatably disposed at one end of one of the limiting plates, which is away from the supporting plate, the lock catch is disposed at the other end of the other limiting plate, which is away from the supporting plate, and the other end of the lock rod can be clamped in the lock catch.

5. The truss arm as claimed in claim 1 further comprising a short pulling plate, wherein the short pulling plate is connected with the long pulling plate through a fastening member, the short pulling plate is provided with a second through hole at each end, the long pulling plate is provided with a third through hole at the end, and the fastening member passes through the second through hole of the short pulling plate and the third through hole of the long pulling plate in sequence.

6. The truss arm of claim 5, further comprising a second limiting member, wherein the second limiting member comprises a protrusion provided at an end of the long tie plate and a limiting rod provided on the short tie plate, the limiting rod is provided on a line connecting the two second through holes, and the limiting rod abuts against the protrusion when the short tie plate is connected to and parallel to the long tie plate.

7. The truss arm as defined in claim 1 further including a nylon spacer block rotatably mounted on the wall of said main chord tube, said nylon spacer block being disposed on the same side as said elongated tension plate.

8. The truss arm as claimed in claim 7, wherein a positioning member is provided on the web member, a groove is provided on a side of the nylon cushion block connected to the positioning member, fourth through holes are provided on both sides of the positioning member, and a fifth through hole is provided on the nylon cushion block, and a positioning pin is passed through the fourth through hole on the positioning member and the fifth through hole on the nylon cushion block in order to fix the nylon cushion block on the main chord member.

9. The truss arm as claimed in claim 1 further comprising a transport assembly including a transport pad and a nesting pulley disposed on the web on a side of the boom body facing away from the long pulling plate, the transport pad being disposed on an outer side of the boom body and the nesting pulley being disposed on an inner side of the boom body.

10. A working vehicle, characterized by comprising a truss arm as defined in any one of claims 1 to 9.

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