CN210117174U - Truss arm and crane - Google Patents

Abstract

The utility model discloses a truss arm and hoist relates to the engineering machine tool field for optimize the structure of truss arm. The truss arm comprises a rectangular support frame, a web member and a first locking piece. The rectangular support frame is provided with at least two fixed positions. The number of the web members is multiple, the web members are connected to form a deformable shape, and the end parts of the web members are hinged with the rectangular support frame; there are at least two web members with ends slidably connected to the rectangular support frame to enable the mounting position to be adjustable. The first locking member is at least partially selectively mountable in at least one of two fixed positions; the first locking piece is located on the sliding path and located outside the sliding connection matching surface, and the first locking piece is used for locking the end portion of the web member and the rectangular support frame so as to prevent the web member from being connected with the rectangular support frame in a sliding mode. The technical scheme can conveniently, quickly and reliably realize the switching of the truss arm between the two cross section shapes.

Description

Truss arm and crane

Technical Field

The utility model relates to an engineering machine tool field, concretely relates to truss arm and hoist.

Background

The truss arm is a key stressed bearing structural member in the field of mechanical engineering, and has an important influence on the lifting performance of engineering machinery. In the related art, in order to improve the lifting performance, the cross-sectional area of the arm section is increased. However, the size of the truss arm after increasing the cross-sectional area is very large, it is difficult to meet the transportation requirements of relevant regulations, and the width, height and length thereof easily exceed the specified limits. In order to transport the truss arms, the truss arms need to be disassembled and assembled; after being transported in place, the truss arms are installed for operation. Therefore, how to ensure that the truss arm has enough hoisting performance and meet the limitation of transportation regulations on the transportation size of the truss arm becomes a key problem restricting the development of the crawler crane.

The inventor finds that although some concepts that the cross-sectional shape of the truss arm is deformable exist in the related art, no specific implementation structure is given. Particularly, what kind of structure can be adopted to simply realize the deformation of the truss arm is a problem to be solved urgently in the field.

SUMMERY OF THE UTILITY MODEL

The utility model provides a truss arm and hoist for optimize the structure of truss arm.

An embodiment of the utility model provides a truss arm, include:

the rectangular support frame is provided with at least two fixed positions;

the number of the web members is multiple, the web members are connected to form a deformable shape, and the end part of each web member is hinged with the rectangular support frame; there are at least two ends of the web members slidably connected to the rectangular bracing frame to enable the mounting position to be adjustable to enable the truss arm cross section to be switched between two shapes; and

a first locking member at least partially selectively mountable to at least one of the two securing locations; the first locking part is located on a sliding path of the end parts of the at least two web members and outside a sliding connection matching surface of the end parts of the at least two web members and the rectangular support frame, and the first locking part is configured to lock the end parts of the web members and the rectangular support frame so as to prevent the web members from being connected in a sliding manner relative to the rectangular support frame.

In some embodiments, the rectangular support frame is provided with a slide, the slide comprising a chute;

the end parts of the two web members are hinged through a connecting piece, and the connecting piece is connected with the sliding groove in a sliding manner; the first locking piece is detachably connected with the rectangular support frame and is positioned on a sliding path at the end part of the connecting piece;

when the first locking piece is in an installation state, the connecting piece is fixedly connected with the rectangular supporting frame; when the first locking piece is in a disassembled state, the connecting piece can slide relative to the rectangular support frame.

In some embodiments, the first locking member comprises:

the first baffle is detachably arranged on the rectangular support frame; and

and the second baffle is arranged on the connecting piece and is propped against the first baffle.

In some embodiments, the rectangular support frame is provided with two nut columns, the two nut columns are respectively positioned at two opposite sides of the connecting piece, and nuts are detachably arranged in the nut columns; the first baffle is configured to be snapped into a gap formed by the two nuts and the second baffle.

In some embodiments, a first protrusion is disposed on a side of the second baffle plate facing the first baffle plate, and the first protrusion abuts against the rectangular support frame to prevent the connecting member from moving relative to the rectangular support frame along the axial direction of the connecting member.

In some embodiments, the first locking member comprises:

the third baffle is in threaded connection with the rectangular support frame and is positioned on the outer surface of the rectangular support frame; the third baffle is configured to block sliding movement of the connector end.

In some embodiments, the first locking member comprises:

the positioning blocks are arranged in pairs and are arranged on the rectangular support frame; and

and the fourth baffle is detachably connected with the connecting piece, and two ends of the fourth baffle respectively abut against one positioning block.

In some embodiments, the truss arm further comprises:

and the second locking piece is positioned at one end, far away from the fourth baffle plate, of the connecting piece and clamped by the shaft shoulder of the connecting piece and the positioning column arranged on the rectangular supporting frame together.

In some embodiments, two sets of the first locking parts are correspondingly arranged on each connecting piece, and each set of the first locking parts is used for respectively blocking one end of each connecting piece; or, each connecting piece is correspondingly provided with a group of first locking pieces, each first locking piece is used for blocking one end of each connecting piece, and the other end of each connecting piece is provided with a second locking piece used for preventing the connecting piece from falling off.

In some embodiments, the truss arm further comprises:

a mounting plate provided with an open slot; the two ends of the sliding chute are respectively provided with at least one mounting plate, and the opening directions of the two open grooves positioned at the two ends of the sliding chute are opposite; the fixed position is arranged on the mounting plate.

In some embodiments, the truss arm further comprises:

a second locking member configured to prevent the connecting member from moving relative to the rectangular support bracket along the axial direction of the connecting member.

In some embodiments, the second locking member comprises:

and the clamp is detachably arranged at the end part of the connecting piece.

In some embodiments, one end of the connecting member is larger than the size of the chute, one end of the connecting member serves as the second locking member, and the other end of the connecting member is provided with the second locking member larger than the size of the chute.

In some embodiments, the rectangular support frame comprises:

the two chords do not intersect; and

and two ends of the sealing web member are respectively connected to the end parts of the two chords.

In some embodiments, the closure web is removably connected to the chord; alternatively, the sealing web is rotatably connected to the chord, and the sealing web is configured to be bendable.

In some embodiments, the web member comprises:

the middle parts of the two first web members are intersected and hinged to form a web member assembly; the end parts of the adjacent first web members of the two adjacent web member assemblies are hinged; and

the two ends of the second web member are respectively detachably connected to the chord member and the sealing web member, and a triangular structure formed by the web member, the chord member and the sealing web member in a surrounding manner is formed;

wherein the first web member and the second web member form a quadrilateral structure together, and the plurality of first web members form a quadrilateral structure together.

In some embodiments, the web member comprises:

the middle parts of the two first web members are intersected and hinged to form a web member assembly; the end parts of the adjacent first web members of the two adjacent web member assemblies are hinged;

the first web members and the rectangular support frame jointly form a trilateral structure, and the first web members jointly form a quadrilateral structure.

In some embodiments, the ends of the slide are closed.

Another embodiment of the utility model provides a crane, include the utility model discloses the truss arm that any technical scheme provided.

According to the truss arm provided by the technical scheme, the web members are connected with the rectangular support frames in a sliding mode, and the web members and the rectangular support frames are locked by the first locking pieces. When the first locking piece needs to deform, the first locking piece is detached or not detached, and is directly loosened to a deformable position, so that the fixing constraint between the web member and the rectangular support frame is released, and the web member can slide relative to the rectangular support frame. After the web member slides in place, the first locking piece is fastened again, the fixing constraint between the web member and the rectangular support frame is recovered, the web member cannot slide relative to the rectangular support frame, and the whole truss arm is stable in structure.

Generally speaking, two sliding positions are provided, and in the first sliding position, the truss arm is in a working state, the size of the cross section of the truss arm is higher, and the whole length of the truss arm is shorter, so that the hoisting requirement in the working process is met. In the second sliding position, the truss arm is in a working state, the cross section of the truss arm is short in size, and the whole length of the truss arm is long, so that the industry requirement in the transportation process is met.

Above-mentioned technical scheme need not dismantle the truss arm completely and has realized the deformation of the cross section of truss arm promptly, and the deformation in-process only needs to demolish or slack first locking piece to first locking piece is located outside the sliding connection fitting surface, and the last truss arm structure size that uses of engineering machine tool is big, and the degree of depth in hole is long, the utility model discloses the above-mentioned mode of embodiment is compared in adopting the mode of wearing the round pin axle to realize the locking, the utility model discloses the above-mentioned technical scheme of embodiment need not be the centering and perforates, and the work efficiency of dismouting and slack first locking piece is high, dismouting easy operation. And demolish or loosen the part that first locking piece related few, the dismouting is efficient, and in the web member slip, do not change the relation of being connected with other parts, web member end connection department wholly slides, and deformation operation is convenient, swift, reliable. According to the technical scheme, the truss arm can be switched between the two cross section shapes simply and conveniently, the switching operation is easy, the truss arm can be quickly disassembled and assembled, the truss arm can be quickly operated, and the working efficiency is high.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

FIG. 1 is a schematic front view of a truss arm;

FIG. 2 is a schematic view of the truss arm switching between two states;

fig. 3 is a schematic structural diagram of a truss arm without a first locking member according to an embodiment of the present invention;

fig. 4 is a schematic view of a partial three-dimensional structure of a truss arm according to an embodiment of the present invention, in which a web member is fixed to one end of a slide way;

fig. 5 is a schematic view of a partial three-dimensional structure of a web member of a truss arm fixed to the other end of a slide way according to an embodiment of the present invention;

fig. 6a is a schematic structural view of a first locking member employed in the truss arm according to some embodiments of the present invention;

FIG. 6b is an enlarged view of a portion of FIG. 6 a;

FIG. 6c is an exploded view at A of FIG. 6 a;

FIG. 6d is a perspective view of the connector of FIG. 6 a;

FIG. 6e is a schematic perspective view of the first baffle plate shown in FIG. 6 a;

FIG. 6f is a perspective view of the second locking member of FIG. 6 a;

FIG. 6g is a perspective view of the second locking member of FIG. 6 a;

fig. 7 is a schematic view of the sliding truss arm according to some embodiments of the present invention after removal of the first locking member;

fig. 8a is a schematic structural view of a first locking member used in a truss arm according to another embodiment of the present invention;

FIG. 8B is an enlarged view of part B of FIG. 8 a;

FIG. 8c is an exploded view at B of FIG. 8 a;

fig. 9a is a schematic partial perspective view of a truss arm according to still other embodiments of the present invention;

FIG. 9b is an enlarged view of a portion of FIG. 9a at C;

FIG. 9C is an exploded side view at C of FIG. 9 a;

FIG. 9d is a schematic perspective view of the first locking member of FIG. 9 a;

fig. 9e is a perspective view of the connector in fig. 9 a.

Detailed Description

The technical solution provided by the present invention will be explained in more detail with reference to fig. 1 to 9 e.

The embodiment of the utility model provides a truss arm, including rectangle support frame 1, web member 2 and first locking piece 3. The construction of the truss arms is illustrated with reference to figures 1 and 2.

For the sake of clarity, an alternative realisation of the web member 2 in the form of a deformable shape will be described. The web member 2 is formed into a deformable shape, for example, in one of the following ways.

Referring to fig. 1 and 2, in some embodiments, the web members 2 include a first web member 21 and a second web member 22. The middle parts of the two first web members 21 are intersected and hinged to form a web member assembly; the ends of adjacent first web members 21 of adjacent two web member assemblies are hinged. The two ends of the second web member 22 are detachably connected to the chord member 13 and the sealing web member 14 respectively, and form a triangular structure enclosed by the web member 2, the chord member 13 and the sealing web member 14. Wherein the first web member 21 and the second web member 22 together form a quadrilateral structure, and the plurality of first web members 21 together form a quadrilateral structure.

Alternatively, only the first web member 21 may be used. In other embodiments, the web member 2 comprises first web members 21, and the middle parts of the two first web members 21 are intersected and hinged to form a web member assembly; the ends of adjacent first web members 21 of adjacent two web member assemblies are hinged. The first web members 21 and the rectangular support frame 1 form a trilateral structure together, and the plurality of first web members 21 form a quadrilateral structure together.

Referring to fig. 1 and 2, the rectangular support frame 1 is provided with at least two fixing positions, and in fig. 1, both ends of each slide 10 described later are provided with fixing positions. The number of the web members 2 is plural, each web member 2 is connected to form a deformable shape, and an end of each web member 2 is hinged to the rectangular support frame 1. The ends where there are at least two web members 2 are slidably connected to the rectangular support frame 1 to enable the mounting position to be adjustable to enable the switching of the cross section of the truss arm between the two shapes. The first locking member 3 is at least partially selectively mounted in at least one of the two fixing positions. The first locking member 3 is located on a sliding path of the end portions of the at least two web members 2, and the first locking member 3 is located outside a matching surface of the end portions of the at least two web members 2 and the rectangular support frame 1 for sliding connection, and the first locking member 3 is configured to lock the end portions of the web members 2 and the rectangular support frame 1 to prevent the web members 2 from sliding connection relative to the rectangular support frame.

Here, the first locking member 3 is located outside the sliding connection fitting surface between the end portions of the at least two web members 2 and the rectangular support frame 1, and is located on the outer side surface of the whole body, taking the joint of the web members 2 and the rectangular support frame 1 as a whole. As shown in fig. 3, the structure of the right end of the slide 10 shown in fig. 3 is schematically shown to rotatably connect the web member 2 to the rectangular support frame 1 without installing the first locking member 3. The rotatable connection as a whole remains connected during deformation of the web member 2. And the rotatable connection as a whole slides together with the part of the first locking member 3 that is not removed during the deformation. The first locking element 3 is located outside the rotatable connection entity, i.e. the part of the end of the first locking element 3 intended for locking the coupling element 4 that is outside the rotatable connection entity. As shown in fig. 4, the outside of the mating surface of the sliding connection refers to the outside surface of the mounting plate (described in detail later) 15 which is coaxial with the two hole centers, i.e. the side surface of fig. 4 which is located at the same end of the slideway 10 and is opposite to the two mounting plates 15.

In some embodiments, the fixed position refers to a position where the end of the web member 2 can be locked with the rectangular support frame 1 so that the end of the web member 2 cannot slip. See fig. 3 for both ends of the slide 10.

Two states of the truss arm are shown in figures 1 and 2. Fig. 1 shows the truss arm in an operational state and fig. 2 shows the truss arm in a transport state. The two states are switched by sliding the ends of at least some of the web members 2 relative to the rectangular support frame 1.

Before describing the specific manner of achieving locking, a specific alternative configuration of the rectangular support 1 will be described.

Referring to fig. 1, in some embodiments, rectangular brace 1 includes chords 13 and closure web members 14. The chord 13 comprises two and the two do not intersect. The ends of the sealing web 14 are connected to the ends of the two chords 13, respectively.

The chords 13 are relatively long and the sealing web 14 is, for example, the same length as the chords 13 or shorter than the chords 13.

The closure web 14 is for example of unchangeable length or of variable length. The closure web 14 is, for example, inflexible or bendable.

Referring to fig. 4, in some embodiments, the rectangular support frame 1 is provided with a slide 10, the slide 10 including a chute 16. The ends of the two web members 2 are hinged by a connecting member 4, and the connecting member 4 is connected with a sliding chute 16 in a sliding way. The first locking piece 3 is detachably connected with the rectangular support frame 1 and is positioned on the sliding path of the end part of the connecting piece 4. When the first locking piece 3 is in the installation state, the connecting piece 4 is fixedly connected with the rectangular support frame 1. When the first locking piece 3 is in a disassembled state, the connecting piece 4 can slide relative to the rectangular support frame 1.

Referring to fig. 3 and 4, in order to facilitate the installation of the end of the web member 2 to the runner 10, the rectangular support frame 1 is provided with a mounting plate 15, and the mounting plate 15 is provided with an open slot 150. The opening of the open slot 150 is directed towards the side of the slide 10 where the runner 16 is located. The mounting plate 15 and the slide way 10 are stacked, and when viewed in a locked state, assuming that the connecting member 4 is a pin, a portion between the M position and the N position in the axial direction of the pin is located in the slide way of the slide way 10.

When the first locking member 3 is in the installed state, the first locking member 3 and the bottom of the open slot 150 together limit the end of the web member 2, preventing the end of the web member 2 from sliding in the sliding slot of the slideway 10. When the first locking member 3 is removed, the end of the web member 2 can be slid out of the opening groove 150.

Referring to fig. 4, in some embodiments, the ends of the slide 10 are closed. Each end corresponding to a locking shape of the web member 2, such as the truss arm in a transport position at the first end of the ramp 10, and in an operative position at the other end of the ramp 10. Those web members 2 which can slide are locked by the first locking member 3 after the sliding ends thereof have moved to either end of the sliding grooves 16 of the slide 10, so that the entire truss arm structure is stabilized.

It should be noted that the rectangular brace 1 is required to be able to deform the web member 2, and if the structure shown in fig. 1 is adopted, the seal web members 14 on both sides need to be removed before the web member 2 is deformed. Specifically, as shown in fig. 2, fig. 2 illustrates a shape (left side shape) deformed from a shape in an operating state to a shape in a transportation state (right side shape). Before deformation, the closure web 14 needs to be removed. If the transformation from the transport state to the operational state is to be performed, the above-mentioned closing web members 14 are installed after the transformation is completed in order to form a stable truss arm structure.

Referring to fig. 3, in some embodiments, the ends of the two web members 2 are hinged by a connecting member 4, and the connecting member 4 is slidably connected with the rectangular support frame 1. The first locking piece 3 is detachably connected with the rectangular support frame 1. The first locking piece 3 is detachably connected with the rectangular support frame 1. When the first locking piece 3 is in an installation state, the connecting piece 4 is fixedly connected with the rectangular support frame 1; when the first locking piece 3 is in a disassembled state, the connecting piece 4 can slide relative to the rectangular support frame 1.

The first locking element 3, for example, directly contacts the connecting element 4 to achieve blocking of the connecting element 4. Or the first locking part 3 comprises a plurality of matched structures, one part of the structures is arranged on the rectangular support frame 1, the other part of the structures is arranged on the connecting piece 4, and the abutting of the end part of the connecting piece 4 is realized through the matched structures. Several ways of realising the end locking of the web member 2 will be described hereinafter.

The structure of the first locking member 3 will be described in detail with reference to the web member 2 being in the locked position. The first locking member 3 is located at a first end of the connecting member 4. The second end of the connecting member 4 is used for mounting a second locking member 5 described later, or the second end of the connecting member 4 is provided with a shoulder or the like which prevents the connecting member 4 from falling out of the mounting hole. The second locking piece 5 prevents the second end of the connecting piece 4 from falling off.

Various configurations of the first locking member 3 will be described below.

Referring to fig. 6a to 7, in some embodiments, the first locking member 3 comprises a first shutter 31 and a second shutter 32. The first shutter 31 is detachably mounted to the rectangular support frame 1. The second baffle 32 is mounted on the connecting member 4 and abuts against the first baffle 31.

The second baffle 32, or end cap, is fan-shaped when viewed from its front view, as shown in fig. 6b, 6c and 6 f.

As shown in fig. 6b, in some embodiments, the rectangular support frame 1 is provided with two nut posts 11, the two nut posts 11 are respectively located at two opposite sides of the connecting member 4, and the nut posts 11 are detachably provided with bolts 12; the first shutter 31 is configured to be able to be caught in a gap formed with the two bolts 12 and the second shutter 32.

As shown in fig. 6b, in some embodiments, the second baffle 32 is located on a side of the connecting member 4 facing away from the first baffle 31. When the bolt is installed, the bolt 12 is installed on the nut post 11, then the first baffle 31 is installed, and then the second baffle 32 is installed. The second baffle 32 abuts against the first baffle 31.

As shown in fig. 6b, in some embodiments, a side of the second baffle 32 facing the first baffle 31 is provided with a first protrusion (not shown), and the first protrusion abuts against the rectangular support frame 1 to prevent the connecting member 4 from moving relative to the rectangular support frame 1 along its own axial direction.

The first bulge is used as a second locking piece 5 later, so that the axial positioning of the end part connecting part of the web member 2 is realized, the phenomenon that the end part connecting part of the web member 2 is moved when the truss arm is in a working state is prevented, and the structural stability of the truss arm is improved.

Referring to fig. 6c, one end of each connecting member 4 is provided with a set of first locking members 3, and the other end is prevented from falling off by a second locking member 5 described later. Alternatively, each connecting member 4 is provided with two sets of first locking members 3, and each set of first locking members 3 is used for blocking one end of the connecting member 4.

Referring to fig. 6a to 6g, each of the skids 10 is provided with 4 mounting plates 15 symmetrically distributed on both sides of the skid 10. Namely, each end of the slide way 10 is provided with two mounting plates 15, and the open slot 150 on the mounting plates 15 is coaxial with the hole center of the slide way 10. The mounting plate 15 has 2 nut posts 11 provided near the open side of the open groove 150, and a circular plate is attached to the nut posts 11. One end of the connecting piece 4 is provided with a threaded hole and the other end is provided with a fan-shaped shoulder (corresponding to the position marked with the second locking piece 5 in fig. 6 d).

Referring to fig. 6b, the second baffle 32 is a fan-shaped structure, the second baffle 32 is provided with a circular hole, and a boss is arranged at the edge of the fan-shaped structure. The bolt 12 and the later-described second baffle 32 together form a gap in which the first baffle 31 is engaged.

In use, as shown in figure 6a, the ends of the first web members 21 are stacked on top of each other with the runners 10 and mounting plate 15 coaxial and connected in series by a connecting member (specifically, a pin) 4. The first baffle 31, the second baffle 32, the gasket, the bolt 12 and the like are used for fixing the end points of the slideway 10. During the sliding process, the connecting member 4 is always connected with the first web member 21 and the slide groove 16.

As shown in fig. 6b, the second apron 32 has been fixed to the end of the connecting piece 4 during installation. The first baffle 31 is then put in place; finally, the bolt 12 on the nut post 11 is tightened.

As shown in fig. 6b, when the arm support needs to have a variable cross section, the first baffle 31 (the number of the first baffles 31 at the end of the web member that needs to slide is several, all the first baffles 31 at the end of the web member need to be removed), and the rest of the components are still fixed into a whole. Under the action of the deforming force, the pin enters the chute 16 of the slideway 10 from the open side of the open slot 150 of the mounting plate 15 and slides along the chute 16 to the other side of the chute 16. Finally, the first baffle 31 and the bolts which are detached are installed in place, so that the end part of the first web member 21 can be fixed again.

According to the technical scheme, in the deformation process of the arm support, the number of assembling parts needing to be disassembled and assembled is small, the size is small, the weight is light, the structure is simple, the maintenance is convenient, and the disassembling and assembling process is concise, efficient and reliable.

Further embodiments of the first locking member 3 are described below.

Referring to fig. 8a to 8c, in some embodiments, the first locking member 3 includes a third blocking plate 33, and the third blocking plate 33 is disposed at one end of the slideway 10 and is in threaded connection with the rectangular support frame 1. Wherein, when the third baffle 33 is in the installation state, the connecting piece 4 is blocked by the third baffle 33 in the gap between the end of the slideway 10 and the third baffle 33.

The third stop 33 is substantially arc-shaped and is provided with an internal recess which cooperates against the end of the connecting element 4 to position the connecting element 4.

Referring to fig. 8a, one end of each connecting member 4 is provided with a set of first locking members 3, and the other end is prevented from falling off by a second locking member 5 described later. Alternatively, each connecting member 4 is provided with two sets of first locking members 3, and each set of first locking members 3 is used for blocking one end of the connecting member 4. During the sliding process, the connecting member 4 is always connected with the first web member 21 and the slide groove 16.

In order to prevent the connecting member 4 from falling off during the sliding process, there may be various falling-off prevention implementations. For example, one end of the connecting member 4 is set to be larger than the chute 16, and a hook or a stopper is provided at the other end of the connecting member 4, thereby preventing the connecting member 4 from falling off. This implementation is equally applicable to the anti-drop in other embodiments.

Referring to fig. 8a to 8c, a total of 4 mounting plates 15 are mounted on each skid 10, and the 4 mounting plates 15 are symmetrically distributed on both sides of the skid 10. I.e. two mounting plates 15 are provided at one end of each ramp 10. The open slot 150 of the mounting plate 15 is coaxial with the center of the sliding slot of the slideway 10, 2 threaded holes are arranged on the mounting plate 15, and one side of the open slot 150 is open.

When the connecting device is used, the end parts of the two first web members 21, the slide way 10 and the mounting plate 15 are mutually overlapped, the hole centers of the parts are coaxial, and the parts are connected in series by the connecting piece (such as a pin shaft) 4.

When the truss arm needs to deform and slide, the third baffle 33, the gasket and the bolt are detached, and then the truss arm can enter the slideway 10 to slide. When the plate 15 is slid to the other end, the third baffle 33 which is removed is fixed.

Referring to fig. 9a to 9e, in some embodiments, the first locking member 3 includes a positioning block 34 and a fourth stopper 35. The positioning blocks 34 are arranged in pairs and mounted on the rectangular support frame 1. The fourth baffle 35 is detachably connected to the connecting member 4, and two ends of the fourth baffle 35 respectively abut against a positioning block 34.

Referring to fig. 9a and 9b, one end of each connecting member 4 is provided with a set of first locking members 3, and the other end is prevented from falling off by a second locking member 5 described later. Alternatively, each connecting member 4 is provided with two sets of first locking members 3, and each set of first locking members 3 is used for blocking one end of the connecting member 4. During the sliding process, the connecting member 4 is always connected with the first web member 21 and the slide groove 16.

Referring to fig. 9e, the connecting member 4 is a pin. The end of the pin (also referred to as the first end) is provided with a recess 41, in which recess 41 a fourth shutter 35 is mounted. The fourth baffle 35 is mounted in the groove 41 by bolts.

Referring to fig. 9c, the truss arm further comprises a second locking member 5, wherein the second locking member 5 is located at an end of the connecting member 4 far away from the fourth baffle 35 and is clamped by the shoulder 42 of the connecting member 4 and the positioning column 6 mounted on the rectangular support frame 1.

Referring to fig. 9c, at the other end of the connecting member 4, i.e., the end (also referred to as a second end) where the fourth shutter 35 is not provided, a second locking member 5 is installed, as shown in fig. 9 c. The second locking member 5 is for example a catch plate. The catch plate is pressed together by the shoulder 42 of the second end of the connecting element 4 and the fixing stud 6 mounted on the mounting plate 15 in fig. 9 c. The compressing state of the fixing column 6 is loosened when the bolt 36 rotates to a certain position, and the fixing column can be taken down in the loosening state, so that the connecting piece 4 can axially move in series for a certain distance to avoid the limit of the positioning block 34 under the condition that any part of the first end of the connecting piece 4 is not detached, and the connecting piece 4 can slide in the sliding groove 16.

That is, the thickness of the second locking member 5 in the axial direction of the connecting member 4 needs to be longer than the thickness of the positioning block 34 in the axial direction of the connecting member 4, so that the connecting member 4 can avoid the positioning block 34 after the second locking member 5 is removed.

As shown in fig. 9d, the fourth baffle 35 is arc-shaped and is matched with the groove 41 at the end part of the connecting piece 4 shown in fig. 9e, the bottom of the groove 41 is provided with a threaded hole, and the fourth baffle 35 is detachably connected with the threaded hole of the connecting piece 4 and the bolt 36. The part of the fourth blocking plate 35 extending outside the groove 41 abuts against the positioning block 34 shown in fig. 9b to lock the connecting element 4. When the sliding of the connecting member 4 is required, the fourth shutter 35 is removed.

Referring to fig. 9b, the mounting plate 15 is mounted with two positioning blocks 34, and the two positioning blocks 34 are located near the opening groove 150. The two positioning blocks 34 cooperate to block the fourth blocking plate 35.

Each slide 10 is provided with 4 mounting plates 15, a group of two mounting plates are symmetrically distributed on two sides of the slide 10, and each end of the two mounting plates 15 is provided with two mounting plates. The two mounting plates 15 on the same side are coaxial with the end hole centers of the runners 16 of the slide 10.

The mounting plate 15 has 2 positioning blocks 34, and one side of the opening groove 150 is open, and the opening direction faces the sliding direction.

When the connecting device is used, the end parts of the two first web members 21, the slide way 10 and the mounting plate 15 are mutually overlapped, the hole centers of the parts are coaxial, the parts are connected in series by the connecting piece (such as a pin shaft) 4, and the positioning block 34, the fourth baffle 35, the gaskets (a plurality of) and the bolts (a plurality of) are fixed on the mounting plate 15.

When sliding deformation is needed, the bolt is firstly unscrewed to a position where the second locking piece 5 can be removed, then the second locking piece 5 is removed, and other parts connected on the connecting piece 4 are not removed. The connecting element 4 is then axially moved back on itself to a position in which the connecting element 4 and the positioning block 34 do not interfere. Then the connecting piece 4 with other structures connected above slides together, when the connecting piece 4 slides to the mounting plate 15 at the other end, the detached and loosened parts are fixed, and the end part of the first web member 21 can be fixed again.

The axial position limitation of the connecting element 4 will be described in its entirety.

In the above embodiments, the truss arm further includes, for example, a second locking member 5, and the second locking member 5 is configured to prevent the connecting member 4 from moving relative to the rectangular support frame 1 along its own axial direction.

There are various implementations of the second locking member 5, such as a catch, or a bump, etc.

In some embodiments, the second locking member 5 comprises a catch that is removably mounted to the end of the connecting member 4.

In some embodiments, closure web 14 is removably connected to chord 13; alternatively, the sealing web 14 is connected to the chord 13 in a rotatable manner, and the sealing web 14 is designed to be bendable.

If the closure web 14 is detachably connected to the chord 13, the truss arm needs to be dismantled when deforming the closure web 14. The closure web 14 is constructed to be bendable, so that the closure web 14 does not need to be removed.

In some embodiments, one end of the connecting member 4 is sized larger than the chute size of the chute 10, and the other end is fitted with a second locking member 5 sized larger than the chute size of the chute 10. The second locking member 5 is, for example, any of the above-mentioned connecting members at the end of the connecting member 4, such as the above-mentioned clip or the fourth shutter 35.

The second locking piece 5 is arranged so that the connecting piece 4 does not fall off from the sliding groove when sliding in the sliding groove of the sliding way 10, thereby reducing the number of parts involved in subsequent installation and ensuring the reliable sliding operation of the connecting piece 4 and other parts connected with the connecting piece 4.

Other embodiments of the utility model provide a crane, include the utility model discloses the truss arm that any technical scheme provided.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: it is to be understood that modifications may be made to the above-described arrangements in the embodiments or equivalents may be substituted for some of the features of the embodiments, but such modifications or substitutions do not depart from the spirit and scope of the present invention.

Claims (19)

1. A truss arm, comprising:

the rectangular support frame (1) is provided with at least two fixed positions;

the number of the web members (2) is multiple, each web member (2) is connected to form a deformable shape, and the end part of each web member (2) is hinged with the rectangular support frame (1); the ends of at least two web members (2) are connected with the rectangular support frame (1) in a sliding way to realize the adjustable installation position so as to realize the switching of the cross section of the truss arm between two shapes; and

a first locking member (3) selectively mountable at least partially in at least one of said two fixing positions; the first locking piece (3) is located on a sliding path of the end portions of the at least two web members (2) and located outside a sliding connection matching surface of the end portions of the at least two web members (2) and the rectangular support frame (1), and the first locking piece (3) is configured to lock the end portions of the web members (2) and the rectangular support frame (1) so as to prevent the web members (2) from being slidably connected relative to the rectangular support frame (1).

2. Truss arm according to claim 1, wherein the rectangular support frame (1) is provided with a runner (10), the runner (10) comprising a runner (16);

the end parts of the two web members (2) are hinged through a connecting piece (4), and the connecting piece (4) is in sliding connection with the sliding groove (16); the first locking piece (3) is detachably connected with the rectangular support frame (1), and the first locking piece (3) is located on a sliding path of the end part of the connecting piece (4).

3. Truss arm according to claim 2, wherein the first locking member (3) comprises:

the first baffle plate (31) is detachably mounted on the rectangular support frame (1); and

and the second baffle (32) is arranged on the connecting piece (4) and is abutted against the first baffle (31).

4. The truss arm as claimed in claim 3, wherein the rectangular support frame (1) is provided with two nut columns (11), the two nut columns (11) are respectively arranged at two opposite sides of the connecting piece (4), and nuts (12) are detachably arranged in the nut columns (11); the first baffle plate (31) is configured to be capable of being clamped in a gap formed by the two nuts (12) and the second baffle plate (32).

5. Truss arm according to claim 3, wherein the second baffle (32) is provided with a first protrusion on a side facing the first baffle (31), the first protrusion abutting against the rectangular support frame (1) to prevent the connector (4) from moving relative to the rectangular support frame (1) along its own axis.

6. Truss arm according to claim 2, wherein the first locking member (3) comprises:

the third baffle (33) is in threaded connection with the rectangular support frame (1) and is positioned on the outer surface of the rectangular support frame (1); the third shutter (33) is configured to block a sliding movement of the end of the connector (4).

7. Truss arm according to claim 2, wherein the first locking member (3) comprises:

the positioning blocks (34) are arranged in pairs and are mounted on the rectangular support frame (1); and

the fourth baffle (35) is detachably connected with the connecting piece (4), and two ends of the fourth baffle (35) respectively abut against one positioning block (34).

8. The truss arm of claim 7, further comprising:

and the second locking piece (5) is positioned at one end, far away from the fourth baffle (35), of the connecting piece (4), and is clamped by a shaft shoulder (42) of the connecting piece (4) and a positioning column (6) arranged on the rectangular supporting frame (1) together.

9. The truss arm according to claim 2, wherein each of the connecting members (4) is provided with two sets of the first locking members (3), and each set of the first locking members (3) is used for blocking one end of the connecting member (4); or, each connecting piece (4) is correspondingly provided with a group of first locking pieces (3), each first locking piece (3) is used for blocking one end of each connecting piece (4), and the other end of each connecting piece (4) is provided with a second locking piece (5) used for preventing the connecting piece (4) from falling off.

10. The truss arm of claim 2 further comprising:

a mounting plate (15) provided with an open slot (150); the two ends of the sliding chute (16) are respectively provided with at least one mounting plate (15), and the opening directions of the two open grooves (150) positioned at the two ends of the sliding chute (16) are opposite; the fixed position is provided on the mounting plate (15).

11. The truss arm of claim 2 further comprising:

a second locking element (5) configured to prevent the connecting element (4) from moving along its own axis with respect to the rectangular support frame (1).

12. Truss arm according to claim 11, wherein the second locking member (5) comprises:

and the clamp is detachably arranged at the end part of the connecting piece (4).

13. Truss arm according to claim 11, wherein one end of the connecting member (4) has a size larger than the size of the runner (16) of the runner (10), one end of the connecting member (4) acts as the second locking member (5), and the other end of the connecting member (4) is fitted with the second locking member (5) having a size larger than the size of the runner (16).

14. Truss arm as claimed in claim 1, wherein the rectangular support frame (1) comprises:

the chord members (13) comprise two intersecting chords; and

and the two ends of the sealing web member (14) are respectively connected to the end parts of the two chords (13).

15. Truss arm according to claim 14, wherein the closure web member (14) is detachably connected to the chord member (13); alternatively, the sealing web (14) is connected to the chord (13) in a rotatable manner, and the sealing web (14) is designed to be bendable.

16. Truss arm according to claim 14, wherein the web member (2) comprises:

the middle parts of the two first web members (21) are intersected and hinged to form a web member assembly; the end parts of the adjacent first web members (21) of two adjacent web member assemblies are hinged; and

the two ends of the second web member (22) are respectively detachably connected to the chord member (13) and the sealing web member (14) to form a triangular structure enclosed by the web member (2), the chord member (13) and the sealing web member (14);

wherein the first web member (21) and the second web member (22) together form a quadrilateral structure, and the plurality of first web members (21) together form a quadrilateral structure.

17. Truss arm as claimed in claim 1, wherein the web members (2) comprise:

the middle parts of the two first web members (21) are intersected and hinged to form a web member assembly; the end parts of the adjacent first web members (21) of two adjacent web member assemblies are hinged;

wherein the first web members (21) and the rectangular support frame (1) jointly form a trilateral structure, and the plurality of first web members (21) jointly form a quadrilateral structure.

18. Truss arm according to claim 2, wherein both ends of the runners (10) are closed.

19. A crane comprising a truss arm as defined in any one of claims 1 to 18.

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