CN111348567A - A lattice 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

A lattice arm and engineering vehicle

technical field

The present invention relates to the technical field of construction vehicles, in particular, to a lattice boom and an construction vehicle.

Background technique

Engineering vehicles are an important part of the equipment industry. For example, a crawler crane, a crawler crane is a machine used for lifting and hoisting that travels on a crawler track. Among them, the lattice boom in the crawler crane is the core component that determines the load capacity of the crawler crane. The lattice boom is composed of multi-section booms. For example, the number of booms of a crawler crane with a super tonnage (over 3,000 tons) is more than 50 sections. Even sixty. Since the booms are carried to the construction site by transport vehicles for assembly operations, more transport vehicles are required for carrying a larger number of booms, so the transportation cost is high.

In order to reduce the transportation cost, there are two methods for carrying booms in the prior art. One method is to stack the booms in double rows and double rows on the transport vehicle, but this method is only suitable for the booms with smaller cross-sectional width. Another method is to use the inner space of the boom to form a second-level suit, that is, to set the boom with a large cross-section on a boom with a small cross-section. Due to the limitation of the boom structure itself, it can only be satisfied with the second-level suit. form, the transportation cost cannot be reduced any further.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a lattice boom and an engineering vehicle, which can increase the single transportation volume and thereby reduce the transportation cost.

Embodiments of the present invention are implemented as follows:

One aspect of the embodiments of the present invention provides a truss arm, comprising: a jib body, the jib body is a truss structure, and the jib body includes four main chords forming a rectangle and a jib disposed between two adjacent main chords There are a plurality of web pipes between the jib body, a long tie plate parallel to the main chord pipe is arranged on one side of the boom body, the long tie plate is arranged on the outer side of the jib body, and the long tie plate is connected to the plurality of webs respectively through the tie plate support The tube is fixed, and the pull plate support is arranged on the abdominal tube.

Optionally, the pull plate support includes two limit plates arranged in parallel and a support plate arranged between the two limit plates, one end of the limit plate is fixedly connected with the support plate, and the other end of the limit plate is also provided There is a first limiting piece, the first limiting piece, the two limiting plates and the support plate are enclosed to form a hollow structure, and the long pull plate is inserted in the hollow structure.

Optionally, the first limiting member is a bolt, the ends of the two limiting plates away from the support plate are respectively provided with first through holes, and the bolts are sequentially passed through the first through holes on the two limiting plates.

Optionally, the first limiting member includes a locking rod and a lock corresponding to the locking rod, one end of the locking rod is rotatably arranged at the end of one of the limiting plates away from the support plate, and the locking buckle is arranged on the other limiting plate. At one end away from the support plate, the other end of the locking rod can be clamped in the locking buckle.

Optionally, the truss arm further includes a short tie plate, the short tie plate and the long tie plate are connected by fasteners, the two ends of the short tie plate are respectively provided with second through holes, and the end of the long tie plate is provided with a third through hole, The fasteners pass through the second through hole on the short pull plate and the third through hole on the long pull plate in sequence.

Optionally, the truss arm further includes a second limiter, the second limiter includes a protrusion provided on the end of the long tie plate and a limit rod set on the short tie plate, the limit rods are arranged on the two first tie plates. On the connecting line of the two through holes, when the short pull plate and the long pull plate are connected and parallel, the limiting rod abuts against the protruding portion.

Optionally, the truss arm further includes a nylon spacer block rotatably arranged on the wall of the main chord tube, and the nylon spacer block is disposed on the same side as the long pull plate.

Optionally, a positioning piece is provided on the abdominal tube, a groove is provided on the side where the nylon pad is connected to the positioning piece, a fourth through hole is arranged on both sides of the positioning piece, and a fifth through hole is arranged on the nylon pad, through which The positioning pins pass through the fourth through hole on the positioning member and the fifth through hole on the nylon spacer block in sequence, so that the nylon spacer block is fixed on the main chord.

Optionally, the truss arm further includes a transport assembly, and the transport assembly includes a transport gasket and a set pulley arranged on the web tube on the side of the boom body away from the long pull plate, the transport pad is set on the outer side of the boom body, and the set pulley is set. on the inside of the boom body.

Another aspect of the embodiments of the present invention provides an engineering vehicle, comprising: a plurality of lattice arms according to any one of the foregoing.

The beneficial effects of the embodiments of the present invention include:

In the lattice boom provided by the embodiment of the present invention, the height of the boom body is reduced by arranging the pull plate support on the web tube, so that the boom body can be assembled in three levels. Specifically, the truss arm includes a jib body that is a truss structure, and the truss structure is composed of four main chord pipes forming a rectangle and a plurality of web pipes arranged between two adjacent main chord pipes, wherein the main chord pipes are The diameter is larger than the diameter of the abdominal tube, and also includes that a long pull plate parallel to the main chord pipe is arranged on one side of the boom body, and the long pull plate is respectively fixed to the outer side of the boom body with a plurality of abdominal tubes through the pull plate supports, and the pull plate is The plate support is arranged on the web tube, and the pull plate support is moved from the main chord tube to the web tube, which can effectively reduce the overall height of the boom body, so that the truss structure can achieve the purpose of three-level set, thereby reducing the truss. Transportation cost of the arm.

The construction vehicle provided by the embodiment of the present invention adopts the above-mentioned lattice arm, and realizes a three-level set through the arm frame body, thereby reducing the transportation cost of the lattice arm.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic structural diagram of a lattice arm provided by an embodiment of the present invention;

2 is a schematic structural diagram of a tension plate support in a lattice arm according to an embodiment of the present invention;

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

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

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

6 is a schematic structural diagram of a three-level set of a lattice arm provided by an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of stacking a plurality of lattice arms according to an embodiment of the present invention.

Icon: 10-main chord; 11-positioning piece; 20-belly pipe; 30-long pull plate; 31-third through hole; 32-protrusion; 40- pull plate support; 41-limit plate; 42 -Support plate; 43-First limit piece; 51-Set pulley; 52-Transport spacer; 60-Short pull plate; 61-Second through hole; 62-Limit rod; 70-Nylon spacer; locating pin.

Detailed ways

In order to make the purposes, 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 accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts 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", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "arranged", "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

1 is a schematic structural diagram of a truss arm provided by an embodiment of the present invention. Please refer to FIG. 1. An embodiment of the present invention provides a truss arm, including: a jib body, the jib body is a truss structure, and the jib body includes a rectangular There are four main chord pipes 10 and a plurality of abdominal pipes 20 arranged between two adjacent main chord pipes 10. A long drawing plate 30 parallel to the main chord pipes 10 is arranged on one side of the boom body. 30 is arranged on the outer side of the boom body, and the long pulling plate 30 is respectively fixed to the plurality of web tubes 20 through the pulling plate supports 40 , and the pulling plate supports 40 are arranged on the web tubes 20 .

Among them, the truss in the truss structure refers to the truss beam, which is a latticed beam structure. The force of each member in the truss structure is mainly unidirectional tension and compression. Through the reasonable arrangement of the upper and lower chords and web members, the bending moment and shear force distribution inside the structure can be adapted. Since the internal forces of tension and compression in the horizontal direction achieve self-balance, the whole structure does not generate horizontal thrust on the support. The structure is flexible and the application range is very wide.

It should be noted that, first, the main chord tube 10 and the web tube 20 are hollow tubes for the purpose of reducing the overall mass of the lattice arm. The abdominal tube 20 includes a straight abdominal tube and an oblique abdominal tube. The straight abdominal tube refers to being arranged between adjacent main chord tubes 10 and its extending direction is perpendicular to the extending direction of the main chord tube 10. The extension direction of the main chords 10 is not perpendicular to the extension direction of the main chords 10, but there is a certain included angle. For example, the web tube 20 on one side of the boom body is a straight web tube, the web tube 20 on the adjacent side is an oblique web tube, and the two adjacent oblique web tubes and the main chord tube 10 form a triangular frame, so that the truss structure more stable.

Second, the long pull plate 30 is arranged on one side of the boom body, and is fixed to the abdominal tube 20 through the pull plate support 40 . For example, the diameter of the main chord tubes 10 is larger than the diameter of the abdominal tubes 20, and the plurality of main chord tubes 10 are provided with accommodating holes. Therefore, the two ends of the plurality of main chord tubes 20 are respectively inserted into two adjacent main chord tubes. 10 , a truss structure is formed, two long tie plates 30 are respectively arranged on one side of the truss structure, and the extension direction of the two long tie plates 30 is the same as that of the main chord 10 .

Wherein, the pull plate support 40 can be of various structures, for example, the pull plate support 40 is a connecting plate with a groove formed inside, the long pull plate 30 is arranged in the groove, and a limit is set at the top of the groove The connecting plate is fixed on the web tube 20 by bolts or welding.

Please refer to FIG. 6 , the diameter of the main chord 10 is larger than the diameter of the abdominal tube 20, therefore, the pull plate support 40 is arranged on the abdominal tube 20, which reduces the height of the boom body as a whole, so that the boom body can realize a three-level suit , In the process of transporting the boom body by the vehicle, the boom body of the three-level suit structure can increase the single transport volume, thereby reducing the transport cost.

In the truss arm provided by the embodiment of the present invention, by arranging the pull plate support 40 on the web tube 20, the height of the arm frame body is reduced, so that the arm frame body can be assembled in three levels. Specifically, the truss arm includes a jib body that is a truss structure, and the truss structure is composed of four main chord pipes 10 forming a rectangle and a plurality of web pipes 20 arranged between two adjacent main chord pipes 10 , wherein the main chord pipes 10 are The diameter of the chord tube 10 is larger than the diameter of the web tube 20, and also includes a long pull plate 30 parallel to the main chord tube 10 provided on one side of the boom body. 20 is fixed on the outside of the boom body, the pull plate support 40 is arranged on the web tube 20, and the pull plate support 40 is moved from the main chord 10 to the web tube 20, which can effectively reduce the overall height of the boom body, The truss structure can achieve the purpose of three-level suit, thereby reducing the transportation cost of the truss arm.

FIG. 2 is a schematic structural diagram of a pull plate support in a lattice arm according to an embodiment of the present invention. Please refer to FIG. 2 . Optionally, the pull plate support 40 includes two limit plates 41 arranged in parallel and arranged in two limit plates. The support plate 42 between the position plates 41, one end of the limit plate 41 is fixedly connected with the support plate 42, and the other end of the limit plate 41 is also provided with a first limit piece 43, the first limit piece 43, two limit The position plate 41 and the support plate 42 are enclosed to form a hollow structure, and the elongated plate 30 is inserted into the hollow structure.

Wherein, the two limit plates 41 are respectively fixed with the support plate 42 , or the two limit plates 41 are integrally formed with the support plate 42 respectively, and one side of the support plate 42 is fixed on the web tube 20 , or the two limit plates 41 It is fixed and arranged on the web tube 20, and the shape of the support plate 42 and the limit plate 41 is not limited here, and those skilled in the art can make corresponding settings according to specific design requirements. The pull plate holder 40 is not limited to the shape in this embodiment.

For example, one end of the two limiting plates 41 is respectively fixedly connected to the web tube 20 , the plate surface of the support plate 42 is close to the tube wall of the web tube 20 , and the long pulling plate 30 is placed between the two limiting plates 41 , It is supported by the support plate 42, and then the first limiter 43 arranged on the other end of the two limiter plates 41 is buckled, so that the long pull plate 30 is set on the first limiter 43, the two limiter plates 41. It is enclosed with the support plate 42 to form a hollow structure.

FIG. 3 is a partially enlarged schematic structural diagram of the area A in FIG. 1 according to an embodiment of the present invention. Please refer to FIG. 3 . Optionally, the first limiting member 43 is a bolt. One end is respectively provided with a first through hole, and the bolts pass through the first through holes on the two limiting plates 41 in sequence.

For example, the pull plate support 40 is fixed on the web tube 20, wherein, there are two ways to fix the pull plate support 40 on the web tube 20, one is to fix the support plate 42 on the web tube 20, and the other is to fix the support plate 42 on the web tube 20. One way is to fix one end of the two limit plates 41 on the abdominal tube 20 , both of which are acceptable, and then place the long stretch plate 30 between the two limit plates 41 and pass the support plate 42 Finally, the bolts pass through the first through holes arranged on the two limit plates 41 in sequence, so as to fix the long pull plate 30 on the pull plate support 40 , that is, the long pull plate 30 is fixed by the pull plate support 40 on the abdominal tube 20 .

A structure of the first limiting member 43 is given above. Optionally, a second structural form of the first limiting member 43 is given. The first limiting member 43 includes a locking rod and a locking rod corresponding to the locking rod. The lock, one end of the lock rod can be rotatably arranged on the end of one of the limit plates 41 away from the support plate 42, the lock is arranged on the end of the other limit plate 41 away from the support plate 42, and the other end of the lock rod can be clamped on the inside the lock.

For example, one end of the two limiting plates 41 is fixed on the abdominal tube 20, and the other end is provided with a first limiting member 43, one of the limiting plates 41 is provided with a locking rod away from the support plate, and the locking rod can have various shapes and structures For example, a round rod, a square rod or a triangular rod, one end of the other limit plate 41 is provided with a lock corresponding to the lock rod. When the lock rod contacts the lock, the lock can lock the lock rod.

Please refer to FIG. 3 , optionally, the truss arm further includes a short tie plate 60 , the short tie plate 60 and the long tie plate 30 are connected by fasteners, and the two ends of the short tie plate 60 are respectively provided with second through holes 61 . The end of the plate 30 is provided with a third through hole 31 , and the fasteners pass through the second through hole 61 on the short pull plate and the third through hole 31 on the long pull plate 30 in sequence.

It should be noted that the shape of the board surface of the short pull plate 60 can be various, for example, square, arc shape, gourd shape, etc., and the shape of the board surface at both ends of the long pull plate 30 can also be various shapes, for example, Square, arc-shaped, gourd-shaped, etc., will not be repeated here.

For example, the plate surfaces at both ends of the long pull plate 30 are arc-shaped, and the short pull plate 60 has arc-shaped plate surfaces at both ends. The plate surfaces at both ends of the pull plate 60 are provided with second through holes 61 , wherein the third through holes correspond to the second through holes 61 , and the fasteners pass through the second through holes 61 and the third through holes 31 to make the pull plate long. 30 is connected to the short tie plate 60, the better the connection effect of the long tie plate 30 and the short tie plate 60, the longer the service life of the truss arm, and the higher the safety.

Referring to FIG. 3 , in order to further improve the connection effect between the long tie plate 30 and the short tie plate 60 , optionally, in this embodiment, the truss arm further includes a second limiting member, and the second limiting member is included in the long tie plate The protruding portion 32 provided at the end of the 30 and the limit rod 62 provided on the short pull plate 60, the limit rod 62 is arranged on the connecting line of the two second through holes 61, and the short pull plate 60 and the long pull plate 30 When connected and parallel, the limiting rod 62 abuts against the protruding portion 32 .

It should be noted that, in order to prevent the short pull plate 60 from swaying in the air, a second limiter is designed to provide a stable force point for the short pull plate 60 to ensure the stability of the short pull plate 60. The second limiter is not only a Limited to the structure in this embodiment, those skilled in the art should know.

For example, in the process of installing the short pull plate 60, when the second through hole 61 on the short pull plate 60 and the third through hole 31 on the long pull plate 30 are fixed by fasteners, the circle at one end of the long pull plate 30 is The arc-shaped plate surface overlaps with the arc-shaped plate surface of a section of the short pull plate 60, which avoids the interference of the arc surface between the long pull plate 30 and the short pull plate 60. When the plate surfaces of the short pull plate 60 and the long pull plate 30 are When the extending direction is parallel, the protruding portion 32 on the long pull plate 30 can just be in contact with the limit rod 62 provided on the short pull plate 60 , so that the second through hole 61 and the limit rod 62 on the short pull plate 60 are two The connection line of the force point is the same as the extension direction of the long pull plate 30 , so as to avoid the short pull plate 60 from shaking.

FIG. 4 is a partial enlarged structural schematic diagram of the area B in FIG. 1 provided by an embodiment of the present invention. Please refer to FIG. 4 . The spacer 70 is arranged on the same side as the long pull plate 30 .

The nylon spacer 70 is made of a new type of engineering plastic, which has high compressive strength and long service life, and can protect the surface of the main chord 10 and avoid surface abrasion or crushing of the main chord 10 during stacking.

It should be noted that the nylon spacer block 70 is detachably arranged on the main chord pipe 10 , and the side surface of the nylon spacer block 70 in contact with the main chord pipe 10 is in an arc shape, and the arc shape is in contact with the main chord pipe 10 . The arcs are arranged correspondingly. Since the function of the nylon spacer block 70 is to make the boom bodies stably stacked together, the other side of the nylon spacer block 70 in contact with the main chord 10 is also corresponding to the main chord 10 Arc shape.

Referring to FIG. 7 , a plurality of truss arms form a three-level set structure, and the three-level set structure is stacked together. The main chord 10 is provided with a rotatable nylon spacer 70. When a plurality of truss arms need to be stacked When the truss arm is used, the nylon spacer block 70 is fixed on the main chord 10. If the truss arm is not stacked, the nylon spacer block 70 can be removed or rotated to the other side of the truss arm. Since the two sides of the nylon spacer 70 in contact with the main chord 10 are arc surfaces corresponding to the wall of the main chord 10, the nylon spacer 70 can also limit the contact of the main chord 10, so that more The stacking of each boom body is more stable. The use of the nylon spacer 70 can also make the main chord 10 in line contact become surface contact, thereby reducing the stress concentration on the contact surface of the main chord 10 and protecting the main chord 10.

Please refer to FIG. 4 , optionally, a positioning member is provided on the abdominal tube 20 , a groove is provided on one side of the nylon pad 70 connected to the positioning member 11 , a fourth through hole is provided on both sides of the positioning member 11 , and the nylon pad The block 70 is provided with a fifth through hole, and the positioning pin 71 passes through the fourth through hole on the positioning member 11 and the fifth through hole on the nylon spacer block 70 in turn, so that the nylon spacer block 70 is fixed on the main string pipe 10. superior.

It should be noted that the main chord 10 is provided with a positioning member 11, the positioning member 11 is used to provide the installation position of the nylon pad 70, and the corresponding nylon pad 70 is correspondingly provided with a groove, so that the positioning member 11 can pass through in this groove. The connection relationship between the nylon spacer 70 and the main chord 10 is not limited to the connection structure in this embodiment, and may also be other structures, which will not be described here.

FIG. 5 is a partial enlarged structural schematic diagram of the area C in FIG. 1 provided by an embodiment of the present invention. Please refer to FIG. 5. Optionally, the truss arm further includes a transport assembly, and the transport assembly includes a section disposed on the arm body away from the long pull plate 30. The transport gasket 52 and the set pulley 51 on the side abdominal tube 20 are provided. The transport pad 52 is arranged on the outside of the boom body, and the set pulley 51 is set on the inner side of the boom body.

It should be noted that the transportation gasket 52 is provided to prevent the boom body from being squeezed during transportation, that is, the transportation gasket 52 is used to protect the abdominal tube 20 from being crushed or scratched during transportation. The sleeve pulley 51 is used to facilitate the sliding of the boom body when the second-level sleeve or the third-level sleeve is formed.

For example, please refer to FIG. 6 , the truss arm includes at least three jib bodies, the three jib bodies are respectively the main arm, the auxiliary arm and the reinforcement arm, wherein the reinforcement arm is sleeved in the auxiliary arm, and the auxiliary arm is sleeved in the main arm. During the process of setting the jib on the reinforcement arm, the transport gasket 52 on the reinforcement arm can protect the tube wall of the abdominal tube 20 from being damaged, and the sleeve pulley 51 in the auxiliary arm changes the sliding friction between the reinforcement arm and the auxiliary arm. Rolling friction is formed, so that the two can save labor and protect the tube wall of the abdominal tube 20 from being damaged during the sleeve setting process or canceling the sleeve structure.

In this embodiment, by arranging the pull plate support 40 on the web tube 20, the overall height of the boom body can be reduced, so that the lattice boom can be a three-level suit, thereby reducing the transportation cost. The nylon spacers 70 are arranged on the main chord 10 to prevent damage to the main chord 10 when a plurality of truss arms are stacked together, and can ensure the stability of the stacked truss arms and avoid safety accidents.

Another aspect of the embodiments of the present invention provides an engineering vehicle, including the above-mentioned lattice boom.

Since the lattice arm of the present application can realize three-level suit, the application of the lattice arm proposed in the present application to the construction vehicle can effectively reduce the transportation cost of the lattice arm, and because the main chord 10 of the arm body is provided with a nylon spacer block 70, the stacking of multi-layer boom bodies can be realized, thereby reducing the yard space occupied by the lattice boom.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within 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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