阅读说明：本技术 折臂伸缩式起重机 (Folding arm telescopic crane ) 是由 何鹏 姬红斌 胡茂 蒋文革 于 2019-07-31 设计创作，主要内容包括：本发明公开了一种折臂伸缩式起重机,属于起重机技术领域。折臂伸缩式起重机包括基柱、回转机构、塔身、水平伸缩机构、水平摆动机构、竖直伸缩机构、主臂变幅油缸、折臂变幅油缸和机械手；水平伸缩机构包括内臂、外臂和伸缩油缸,外臂可滑动地套设在内臂外,内臂的第一端从外臂的第一端伸出,伸缩油缸的缸体与外臂固定连接,伸缩油缸的活塞杆与内臂固定连接；水平摆动机构包括摆动臂和摆动油缸,摆动油缸的伸缩平面与主臂变幅油缸的伸缩平面垂直；竖直伸缩机构的结构与水平伸缩机构的结构相同,折臂变幅油缸的伸缩平面与主臂变幅油缸的伸缩平面平行或者重合；机械手固定在水平伸缩机构的内臂的第一端上。本发明可以减少起重机占用的空间。(The invention discloses a folding arm telescopic crane, and belongs to the technical field of cranes. The folding arm telescopic crane comprises a foundation column, a swing mechanism, a tower body, a horizontal telescopic mechanism, a horizontal swing mechanism, a vertical telescopic mechanism, a main arm luffing cylinder, a folding arm luffing cylinder and a manipulator; the horizontal telescopic mechanism comprises an inner arm, an outer arm and a telescopic oil cylinder, the outer arm is slidably sleeved outside the inner arm, the first end of the inner arm extends out of the first end of the outer arm, the cylinder body of the telescopic oil cylinder is fixedly connected with the outer arm, and the piston rod of the telescopic oil cylinder is fixedly connected with the inner arm; the horizontal swinging mechanism comprises a swinging arm and a swinging oil cylinder, and the telescopic plane of the swinging oil cylinder is vertical to the telescopic plane of the luffing oil cylinder of the main arm; the structure of the vertical telescopic mechanism is the same as that of the horizontal telescopic mechanism, and the telescopic plane of the luffing cylinder of the folding arm is parallel to or coincident with the telescopic plane of the luffing cylinder of the main arm; the manipulator is fixed on the first end of the inner arm of the horizontal telescopic mechanism. The invention can reduce the space occupied by the crane.)

1. The folding arm telescopic crane is characterized by comprising a base column (11), a swing mechanism (12), a tower body (13), a horizontal telescopic mechanism (20), a horizontal swing mechanism (30), a vertical telescopic mechanism (40), a main arm luffing oil cylinder (51), a folding arm luffing oil cylinder (52) and a manipulator (60); the slewing mechanism (12) is arranged on the foundation column (11), and the tower body (13) is arranged on the slewing mechanism (12); the horizontal telescopic mechanism (20) comprises an inner arm (71), an outer arm (72) and a telescopic oil cylinder (73), the outer arm (72) is slidably sleeved outside the inner arm (71), the first end of the inner arm (71) extends out of the first end of the outer arm (72), the cylinder body of the telescopic oil cylinder (73) is fixedly connected with the outer arm (72), and the piston rod of the telescopic oil cylinder (73) is fixedly connected with the inner arm (71); the second end of an outer arm (72) of the horizontal telescopic mechanism (20) is hinged with one side, far away from the slewing mechanism (12), of the tower body (13) and the rod end of the main arm luffing oil cylinder (51), and the rodless end of the main arm luffing oil cylinder (51) is hinged with one side, close to the slewing mechanism (12), of the tower body (13); the horizontal swing mechanism (30) comprises a swing arm (31) and a swing oil cylinder (32), a first end of the swing arm (31) and a non-rod end of the swing oil cylinder (32) are respectively hinged with a first end of an inner arm (71) of the horizontal telescopic mechanism (20), a rod end of the swing oil cylinder (32) is hinged with a second end of the swing arm (31), and a telescopic plane of the swing oil cylinder (32) is vertical to a telescopic plane of the main arm luffing oil cylinder (51); the structure of the vertical telescopic mechanism (40) is the same as that of the horizontal telescopic mechanism (20); the second end of an outer arm (72) of the vertical telescopic mechanism (40) is hinged with the second end of the swing arm (31) and the rod end of the folding arm variable amplitude oil cylinder (52), the rodless end of the folding arm variable amplitude oil cylinder (52) is hinged with the first end of the swing arm (31), and the telescopic plane of the folding arm variable amplitude oil cylinder (52) is parallel to or coincident with the telescopic plane of the main arm variable amplitude oil cylinder (51); the manipulator (60) is fixed on a first end of an inner arm (71) of the horizontal telescopic mechanism (20).

2. Folding arm telescopic crane according to claim 1, wherein the horizontal swinging mechanism (30) further comprises a connecting shaft (33) and a rotating bearing (34); the rotating bearing (34) and the first end of the inner arm (71) of the horizontal telescopic mechanism (20) are respectively sleeved on the connecting shaft (33), and the first end of the swinging arm (31) is sleeved on the rotating bearing (34).

3. Folding arm telescopic crane according to claim 2, wherein the number of said rotating bearings (34) is two, said horizontal swinging mechanism (30) further comprising two swinging arm bushings (35) and three telescopic arm bushings (36); three telescopic arm axle sleeve (36) and two rolling bearing (34) are followed the axial of connecting axle (33) is established in turn the cover outside connecting axle (33), swing arm axle sleeve (35) with rolling bearing (34) one-to-one, the first end of swing arm (31) is passed through swing arm axle sleeve (35) cover is established outside rolling bearing (34) that swing arm axle sleeve (35) corresponds, the first end of the interior arm (71) of horizontal telescopic machanism (20) is passed through telescopic arm axle sleeve (36) cover is established on rolling bearing (34).

4. Folding arm telescopic crane according to claim 3, wherein the horizontal swinging mechanism (30) further comprises a thrust bearing (37); the thrust bearing (37) is sleeved outside the connecting shaft (33) and is clamped between the swing arm shaft sleeve (35) and the telescopic arm shaft sleeve (36).

5. A folding arm telescopic crane according to any one of claims 1 to 4, characterized in that the cylinder body of the telescopic cylinder (73) is fixed on the first end of the outer arm (72), and the piston rod of the telescopic cylinder (73) is fixedly connected with the first end of the inner arm (71).

6. A folding jib telescopic crane according to any one of claims 1 to 4, wherein the cross section of the inner jib (71) and the outer jib (72) perpendicular to the extension direction is hexagonal, a pair of parallel sides of the hexagon of the horizontal telescopic mechanism (20) is parallel to the telescopic plane of the main jib luffing cylinder (51), and a pair of parallel sides of the hexagon of the vertical telescopic mechanism (40) is parallel to the telescopic plane of the folding jib luffing cylinder (52).

7. Folding arm telescopic crane according to claim 6, wherein the horizontal telescopic mechanism (20) further comprises a first sliding assembly comprising a first slideway (81), a first roller (82), a first rolling bearing (83), a first rolling shaft (84) and two first shutters (85); the first slideway (81) is arranged on a first end of the inner arm (71) and extends towards a second end of the inner arm (71); the two first baffle plates (85) are relatively fixed on the first end of the outer arm (72), the first rolling shaft (84) is clamped between the two first baffle plates (85), and the first roller (82) is sleeved on the first rolling bearing (83) through the first rolling bearing (83) and is slidably arranged in the first slideway (81).

8. The telescopic crane according to claim 7, characterized in that said first sliding assemblies are four in number, four of said first sliding assemblies being respectively arranged on two pairs of parallel sides of said hexagon, the side of said hexagon of said horizontal telescopic mechanism (20) on which said first sliding assemblies are arranged being not parallel to the telescopic plane of said main jib luffing cylinder (51), and the side of said hexagon of said vertical telescopic mechanism (40) on which said first sliding assemblies are arranged being not parallel to the telescopic plane of said folding jib luffing cylinder (52).

9. Folding arm telescopic crane according to claim 6, wherein the horizontal telescopic mechanism (20) further comprises a second sliding assembly comprising a second slideway (91), a second roller (92), a second rolling bearing (93), a second rolling shaft (94) and two second shutters (95); the second slideway (91) is arranged on the second end of the outer arm (72) and extends towards the first end of the outer arm (72); the two second baffle plates (95) are relatively fixed to the second end of the inner arm (71), the second rolling shaft (94) is clamped between the two second baffle plates (95), and the second roller (92) is sleeved on the second roller (92) through the second rolling shaft (94) and is slidably arranged in the second slideway (91).

10. Folding jib telescopic crane according to claim 9, wherein the number of said second sliding assemblies is four, four of said second sliding assemblies being arranged on two pairs of parallel sides of said hexagon, the side of said hexagon of said horizontal telescopic mechanism (20) on which said second sliding assemblies are arranged being non-parallel to the telescopic plane of said main jib luffing cylinder (51), and the side of said hexagon of said vertical telescopic mechanism (40) on which said second sliding assemblies are arranged being non-parallel to the telescopic plane of said folding jib luffing cylinder (52).

Technical Field

The invention relates to the technical field of cranes, in particular to a folding arm telescopic crane.

Background

The crane is a multi-action crane that vertically lifts and horizontally carries heavy objects within a certain range. The suspension arm is the basic structure of the crane and plays an important role in the operation range of the crane for lifting articles. If the working range needs to be enlarged, the length of the suspension arm of the crane is increased, but the crane occupies a larger space at the same time, and the crane is particularly not suitable for arranging a ship crane with a tight space.

Disclosure of Invention

The embodiment of the invention provides a folding arm telescopic crane, which can enlarge the operation range of the crane and cannot enlarge the arrangement space of the crane. The technical scheme is as follows:

the embodiment of the invention provides a folding arm telescopic crane, which comprises a foundation column, a swing mechanism, a tower body, a horizontal telescopic mechanism, a horizontal swinging mechanism, a vertical telescopic mechanism, a main arm luffing cylinder, a folding arm luffing cylinder and a manipulator, wherein the foundation column is arranged on the swing mechanism; the slewing mechanism is arranged on the foundation column, and the tower body is arranged on the slewing mechanism; the horizontal telescopic mechanism comprises an inner arm, an outer arm and a telescopic oil cylinder, the outer arm is slidably sleeved outside the inner arm, the first end of the inner arm extends out of the first end of the outer arm, the cylinder body of the telescopic oil cylinder is fixedly connected with the outer arm, and the piston rod of the telescopic oil cylinder is fixedly connected with the inner arm; the second end of the outer arm of the horizontal telescopic mechanism is respectively hinged with one side of the tower body far away from the slewing mechanism and the rod end of the main arm luffing oil cylinder, and the rodless end of the main arm luffing oil cylinder is hinged with one side of the tower body close to the slewing mechanism; the horizontal swing mechanism comprises a swing arm and a swing oil cylinder, the first end of the swing arm and the rodless end of the swing oil cylinder are respectively hinged with the first end of the inner arm of the horizontal telescopic mechanism, the rod end of the swing oil cylinder is hinged with the second end of the swing arm, and the telescopic plane of the swing oil cylinder is perpendicular to the telescopic plane of the luffing oil cylinder of the main arm; the structure of the vertical telescopic mechanism is the same as that of the horizontal telescopic mechanism; the second end of the outer arm of the vertical telescopic mechanism is respectively hinged with the second end of the swing arm and the rod end of the folded arm variable amplitude oil cylinder, the rodless end of the folded arm variable amplitude oil cylinder is hinged with the first end of the swing arm, and the telescopic plane of the folded arm variable amplitude oil cylinder is parallel to or coincided with the telescopic plane of the main arm variable amplitude oil cylinder; the manipulator is fixed on the first end of the inner arm of the horizontal telescopic mechanism.

Optionally, the horizontal swinging mechanism further comprises a connecting shaft and a rotating bearing; the rotating bearing and the first end of the inner arm of the horizontal telescopic mechanism are respectively sleeved on the connecting shaft, and the first end of the swinging arm is sleeved on the rotating bearing.

Furthermore, the number of the rotating bearings is two, and the horizontal swinging mechanism further comprises two swinging arm shaft sleeves and three telescopic arm shaft sleeves; the three telescopic arm shaft sleeves and two rolling bearings are alternately sleeved outside the connecting shaft along the axial direction of the connecting shaft, the swing arm shaft sleeves correspond to the rolling bearings one by one, the first end of the swing arm is sleeved outside the rolling bearings corresponding to the swing arm shaft sleeves, and the first end of the inner arm of the horizontal telescopic mechanism is sleeved on the rolling bearings through the telescopic arm shaft sleeves.

Furthermore, the horizontal swinging mechanism also comprises a thrust bearing; the thrust bearing is sleeved outside the connecting shaft and is clamped between the swing arm shaft sleeve and the telescopic arm shaft sleeve.

Optionally, a cylinder body of the telescopic cylinder is fixed to the first end of the outer arm, and a piston rod of the telescopic cylinder is fixedly connected to the first end of the inner arm.

Optionally, the cross section of the inner boom and the outer boom perpendicular to the extending direction is a hexagon, a pair of parallel edges in the hexagon of the horizontal telescopic mechanism is parallel to the telescopic plane of the main boom luffing cylinder, and a pair of parallel edges in the hexagon of the vertical telescopic mechanism is parallel to the telescopic plane of the folding boom luffing cylinder.

Further, the horizontal telescopic mechanism further comprises a first sliding assembly, and the first sliding assembly comprises a first slideway, a first roller, a first rolling bearing, a first rolling shaft and two first baffles; the first slideway is arranged at the first end of the inner arm and extends towards the second end of the inner arm; the two first baffles are relatively fixed to the first end of the outer arm, the first rolling shaft is clamped between the two first baffles, and the first roller is sleeved on the first rolling bearing through the first rolling bearing and slidably arranged in the first slide way.

Furthermore, the number of the first sliding assemblies is four, the four first sliding assemblies are respectively arranged on two pairs of parallel edges in the hexagon, the edge of the hexagon of the horizontal telescopic mechanism, which is provided with the first sliding assembly, is not parallel to the telescopic plane of the main arm luffing cylinder, and the edge of the hexagon of the vertical telescopic mechanism, which is provided with the first sliding assembly, is not parallel to the telescopic plane of the folding arm luffing cylinder.

Further, the horizontal telescopic mechanism further comprises a second sliding assembly, and the second sliding assembly comprises a second slideway, a second roller, a second rolling bearing, a second rolling shaft and two second baffles; the second slideway is arranged at the second end of the outer arm and extends towards the first end of the outer arm; the two second baffles are relatively fixed on the second end of the inner arm, the second rolling shaft is clamped between the two second baffles, and the second roller is sleeved on the second roller through the second rolling shaft and is slidably arranged in the second slideway.

Furthermore, the number of the second sliding assemblies is four, the four second sliding assemblies are respectively arranged on two pairs of parallel edges in the hexagon, the edge of the hexagon of the horizontal telescopic mechanism, which is provided with the second sliding assembly, is not parallel to the telescopic plane of the main arm luffing cylinder, and the edge of the hexagon of the vertical telescopic mechanism, which is provided with the second sliding assembly, is not parallel to the telescopic plane of the folding arm luffing cylinder.

The technical scheme provided by the embodiment of the invention has the following beneficial effects:

through all adopting the inner arm with horizontal telescopic machanism and vertical telescopic machanism, outer arm and flexible hydro-cylinder realize, the cover is established outside the inner arm to outer arm slidable, the cylinder body and the piston rod of flexible hydro-cylinder respectively with outer arm and outer arm fixed connection, can utilize flexible hydro-cylinder can stretch out the inner arm from outer arm, the operation scope of increase hoist level and two vertical directions, also can utilize flexible hydro-cylinder to retract the inner arm to outer arm in, reduce the space that the hoist occupy, be particularly suitable for setting up the marine hoist that the space is nervous.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a folding arm telescopic crane provided by an embodiment of the invention;

FIG. 2 is a top view of a horizontal swing mechanism provided by an embodiment of the present invention;

FIG. 3 is a partial schematic view of a horizontal swing mechanism provided by an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a first slide assembly provided in accordance with an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a second sliding assembly according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiment of the invention provides a folding arm telescopic crane. Fig. 1 is a schematic structural diagram of a folding arm telescopic crane according to an embodiment of the present invention. Referring to fig. 1, the folding jib telescopic crane includes a base column 11, a swing mechanism 12, a tower body 13, a horizontal telescopic mechanism 20, a horizontal swing mechanism 30, a vertical telescopic mechanism 40, a main jib luffing cylinder 51, a folding jib luffing cylinder 52, and a manipulator 60.

The turning mechanism 12 is provided on the foundation column 11, and the tower body 13 is provided on the turning mechanism 12.

The horizontal telescopic mechanism 20 comprises an inner arm 71, an outer arm 72 and a telescopic oil cylinder 73, wherein the outer arm 72 is slidably sleeved outside the inner arm 71, the first end of the inner arm 71 extends out from the first end of the outer arm 72, the cylinder body of the telescopic oil cylinder 73 is fixedly connected with the outer arm 72, and the piston rod of the telescopic oil cylinder 73 is fixedly connected with the inner arm 71. The second end of the outer arm 72 of the horizontal telescopic mechanism 20 is hinged to one side of the tower body 13 far away from the slewing mechanism 12 and the rod end of the main arm luffing cylinder 51, and the rodless end of the main arm luffing cylinder 51 is hinged to one side of the tower body 13 near the slewing mechanism 12.

Fig. 2 is a top view of a horizontal swing mechanism according to an embodiment of the present invention. Referring to fig. 2, the horizontal swing mechanism 30 includes a swing arm 31 and a swing cylinder 32, a first end of the swing arm 31 and a non-rod end of the swing cylinder 32 are respectively hinged to a first end of an inner arm 71 of the horizontal telescopic mechanism 20, a rod end of the swing cylinder 32 is hinged to a second end of the swing arm 31, and a telescopic plane of the swing cylinder 32 is perpendicular to a telescopic plane of the main arm luffing cylinder 51.

As shown in fig. 1, the vertical retracting mechanism 40 has the same structure as the horizontal retracting mechanism 20. The second end of the outer boom 72 of the vertical telescopic mechanism 40 is respectively hinged with the second end of the swing arm 31 and the rod end of the folding boom variable amplitude oil cylinder 52, the rodless end of the folding boom variable amplitude oil cylinder 52 is hinged with the first end of the swing arm 31, and the telescopic plane of the folding boom variable amplitude oil cylinder 52 is parallel to or coincident with the telescopic plane of the main boom variable amplitude oil cylinder 51.

The robot arm 60 is fixed to a first end of an inner arm 71 of the horizontal telescopic mechanism 20.

According to the embodiment of the invention, the horizontal telescopic mechanism and the vertical telescopic mechanism are realized by adopting the inner arm, the outer arm and the telescopic oil cylinder, the outer arm is slidably sleeved outside the inner arm, the cylinder body and the piston rod of the telescopic oil cylinder are respectively and fixedly connected with the outer arm and the outer arm, the inner arm can be extended out of the outer arm by utilizing the telescopic oil cylinder, the horizontal and vertical operation ranges of the crane are enlarged, the inner arm can be retracted into the outer arm by utilizing the telescopic oil cylinder, the occupied space of the crane is reduced, and the crane is particularly suitable for being provided with a ship crane with short space. And moreover, the telescopic oil cylinder is adopted to realize the telescopic action of the inner arm, the action is rapid, and the working efficiency is not influenced.

In addition, the swing arm and the swing oil cylinder are additionally arranged to realize a horizontal swing mechanism, the operation area of the crane can be adjusted on the horizontal plane, the horizontal swing mechanism is matched with the main arm luffing oil cylinder, the folding arm luffing oil cylinder and the telescopic oil cylinders of the horizontal telescopic mechanism and the vertical telescopic mechanism, the positions of the mechanical arms are respectively adjusted in all directions from different dimensions, and various operation requirements can be met.

In practical application, the oil cylinder can be hinged with a certain component in a mode of being hinged with an ear plate fixed on the certain component.

As shown in fig. 1, a foundation column 11, a slewing mechanism 12, and a tower 13 are provided on a deck of a ship in this order in the vertical direction.

Fig. 3 is a partial schematic view of a horizontal swing mechanism according to an embodiment of the present invention. Referring to fig. 3, the horizontal swing mechanism 30 may further optionally include a connecting shaft 33 and a rotation bearing 34. The rotating bearing 34 and the first end of the inner arm 71 of the horizontal telescopic mechanism 20 are respectively sleeved on the connecting shaft 33, and the first end of the swing arm 31 is sleeved on the rotating bearing 34.

The inner arm is hinged with the swing arm through the connecting shaft and the rotating bearing, so that the movable area of the swing arm is limited, and meanwhile, the firmness of connection is enhanced.

Further, as shown in fig. 3, the number of the rotation bearings 34 may be two, and the horizontal swing mechanism 30 may further include two swing arm bushings 35 and three telescopic arm bushings 36. The three telescopic arm shaft sleeves 36 and the two rotating bearings 34 are alternately sleeved outside the connecting shaft 33 along the axial direction of the connecting shaft 33, the swinging arm shaft sleeves 35 correspond to the rotating bearings 34 one by one, the first end of the swinging arm 31 is sleeved outside the rotating bearing 34 corresponding to the swinging arm shaft sleeve 35 through the swinging arm shaft sleeve 35, and the first end of the inner arm 71 of the horizontal telescopic mechanism 20 is sleeved on the rotating bearing 34 through the telescopic arm shaft sleeve 36.

Carry out fixed connection through the axle sleeve, be favorable to buffering the effort that relative rotation in-process produced, reduce the damage. And three telescopic arm shaft sleeves fixedly connected with the inner arm and two swing arm shaft sleeves fixedly connected with the swing arms respectively are alternately arranged, so that the three telescopic arm shaft sleeves fixed on the connecting shaft can be utilized to clamp the two swing arm shaft sleeves, and the sliding friction between the two swing arm shaft sleeves and the connecting shaft is reduced.

Further, the horizontal swing mechanism 30 may further include a thrust bearing 37. The thrust bearing 37 is sleeved outside the connecting shaft 33 and is sandwiched between the swing arm shaft sleeve 35 and the telescopic arm shaft sleeve 36.

Through addding thrust bearing, can reduce the sliding friction between swing arm axle sleeve and the flexible arm axle sleeve on the one hand, on the other hand can bear axial load, shares the pressure that the flexible arm axle sleeve bore.

In practical applications, the thrust bearing 37 is disposed between the middle telescopic arm shaft sleeve 36 and the upper telescopic arm shaft sleeve 36 among the three telescopic arm shaft sleeves 36, so as to achieve the best effect.

Alternatively, as shown in fig. 1, the cylinder body of the telescopic cylinder 73 may be fixed to the first end of the outer arm 72, and the piston rod of the telescopic cylinder 73 may be fixedly connected to the first end of the inner arm 71.

The cylinder body of the telescopic oil cylinder is fixed at the first end of the outer arm, the extending length of the inner arm can be maximized, the operation range of the crane is favorably enlarged, and meanwhile, the telescopic direction of the inner arm is favorably guided by matching with the piston rod of the telescopic oil cylinder and the first end of the inner arm in a fixed connection mode.

In one implementation of the present embodiment, the horizontal telescoping mechanism 20 may further include a first sliding assembly. Fig. 4 is a schematic structural diagram of a first sliding assembly according to an embodiment of the present invention. Referring to fig. 4, the first sliding assembly includes a first slideway 81, a first roller 82, a first rolling bearing 83, a first rolling shaft 84, and two first baffles 85. A first slideway 81 is provided on a first end of the inner arm 71 and extends towards a second end of the inner arm 71. The two first baffle plates 85 are relatively fixed on the first end of the outer arm 72, the first rolling shaft 84 is clamped between the two first baffle plates 85, and the first roller 82 is sleeved on the first rolling bearing 83 through the first rolling bearing 83 and is slidably arranged in the first slideway 81.

Accordingly, the vertical retracting mechanism 40 may further include a first sliding assembly.

By additionally arranging a sliding assembly consisting of a slide way, a roller, a rolling bearing, a rolling shaft and a baffle plate, the sliding friction between the inner arm and the outer arm is changed into rolling friction, and the friction force generated by relative movement between the inner arm and the outer arm is reduced.

In practical applications, as shown in fig. 4, the number of the first rolling bearings 83 may be two, and the two first rolling bearings 83 are respectively disposed near the two first baffles 85, which is beneficial to sufficiently relieving friction generated by relative rotation between the roller and the rolling shaft.

In addition, as shown in fig. 4, the first sliding assembly may further include a first bearing retainer 86, where the first bearing retainer 86 is sleeved on the first rolling shaft 84 and is clamped between the first rolling bearing 83 and the first baffle 85, so as to be beneficial to relieving an acting force between the first rolling bearing and the first baffle and reduce wear.

Alternatively, as shown in fig. 4, the cross-section of the inner boom 71 and the outer boom 72 perpendicular to the extending direction may be hexagonal, a pair of parallel sides of the hexagon of the horizontal telescopic mechanism 20 being parallel to the telescopic plane of the main arm luffing cylinder 51, and a pair of parallel sides of the hexagon of the vertical telescopic mechanism 40 being parallel to the telescopic plane of the folding arm luffing cylinder 52.

The inner arm and the outer arm are of hexagonal structures, a pair of parallel edges in the hexagon is parallel to the telescopic plane of the variable amplitude oil cylinder, and the connecting point of the variable amplitude oil cylinder and the hexagon is the intersection point of two adjacent edges, so that the bending strength of the telescopic arm on the variable amplitude plane is improved, and the deflection of the telescopic arm is reduced.

In practical application, an included angle between an edge of the hexagon of the horizontal telescopic mechanism 20, which is not parallel to the telescopic plane of the main arm luffing cylinder 51, and the telescopic plane of the main arm luffing cylinder 51 may be 75 °, and an included angle between an edge of the hexagon of the vertical telescopic mechanism 40, which is not parallel to the telescopic plane line of the folding arm luffing cylinder 52, and the telescopic plane of the folding arm luffing cylinder 52 may be 60 °.

Further, as shown in fig. 4, the number of the first sliding assemblies may be four, four first sliding assemblies are respectively disposed on two pairs of parallel sides in the hexagon, the side of the hexagon of the horizontal telescopic mechanism 20 on which the first sliding assemblies are disposed is not parallel to the telescopic plane of the main boom luffing cylinder 51, and the side of the hexagon of the vertical telescopic mechanism 40 on which the first sliding assemblies are disposed is not parallel to the telescopic plane of the folding boom luffing cylinder 52.

The four sliding assemblies are respectively arranged on each side which is not parallel to the amplitude variation plane, so that the bending strength of the telescopic boom on the amplitude variation plane is improved, and the deflection of the telescopic boom is reduced.

In another implementation of the present embodiment, the horizontal telescoping mechanism 20 may further include a second sliding assembly. Fig. 5 is a schematic structural diagram of a second sliding assembly according to an embodiment of the present invention. Referring to fig. 5, the second sliding assembly includes a second slideway 91, a second roller 92, a second rolling bearing 93, a second rolling shaft 94 and two second shutters 95. A second slideway 91 is provided on the second end of the outer arm 72 and extends towards the first end of the outer arm 72. Two second baffles 95 are relatively fixed on the second end of the inner arm 71, the second rolling shaft 94 is clamped between the two second baffles 95, and the second roller 92 is sleeved on the second roller 92 through the second rolling shaft 94 and slidably disposed in the second slideway 91.

Accordingly, the vertical retracting mechanism 40 may further include a second sliding assembly.

By additionally arranging a sliding assembly consisting of a slide way, a roller, a rolling bearing, a rolling shaft and a baffle plate, the sliding friction between the inner arm and the outer arm is changed into rolling friction, and the friction force generated by relative movement between the inner arm and the outer arm is reduced.

In practical applications, as shown in fig. 5, the number of the second rolling bearings 93 may be two, and the second rolling bearings 93 are respectively disposed near the two second baffles 95, which is beneficial to sufficiently relieving friction generated by relative rotation between the roller and the rolling shaft.

In addition, as shown in fig. 5, the second sliding assembly may further include a second bearing retainer 96, and the second bearing retainer 96 is sleeved on the second rolling shaft 94 and is clamped between the second rolling bearing 93 and the second baffle 95, so as to be beneficial to relieving an acting force between the second rolling bearing and the second baffle and reducing abrasion.

Alternatively, as shown in fig. 5, the cross-section of the inner boom 71 and the outer boom 72 perpendicular to the extending direction may be hexagonal, a pair of parallel sides of the hexagon of the horizontal telescopic mechanism 20 being parallel to the telescopic plane of the main arm luffing cylinder 51, and a pair of parallel sides of the hexagon of the vertical telescopic mechanism 40 being parallel to the telescopic plane of the folding arm luffing cylinder 52.

The inner arm and the outer arm are of hexagonal structures, a pair of parallel edges in the hexagon is parallel to the telescopic plane of the variable amplitude oil cylinder, and the connecting point of the variable amplitude oil cylinder and the hexagon is the intersection point of two adjacent edges, so that the bending strength of the telescopic arm on the variable amplitude plane is improved, and the deflection of the telescopic arm is reduced.

Further, as shown in fig. 5, the number of the second sliding assemblies may be four, four second sliding assemblies are respectively disposed on two pairs of parallel sides in the hexagon, the side of the hexagon of the horizontal telescopic mechanism 20 on which the second sliding assemblies are disposed is not parallel to the telescopic plane of the main boom luffing cylinder 51, and the side of the hexagon of the vertical telescopic mechanism 40 on which the second sliding assemblies are disposed is not parallel to the telescopic plane of the folding boom luffing cylinder 52.

The four sliding assemblies are respectively arranged on each side which is not parallel to the amplitude variation plane, so that the bending strength of the telescopic boom on the amplitude variation plane is improved, and the deflection of the telescopic boom is reduced.

In yet another implementation manner of the present embodiment, the horizontal telescopic mechanism 20 may further include a first sliding component and a second sliding component, and the structures of the first sliding component and the second sliding component may be the same as the above implementation manner. Through addding first slip subassembly and second slip subassembly simultaneously, change the sliding friction between inner arm and the outer arm into rolling friction on the one hand, reduce frictional force, on the other hand first slip subassembly and the cooperation of second slip subassembly are favorable to improving horizontal telescopic machanism's structural stability.

Accordingly, the vertical retracting mechanism 40 may further include a first sliding assembly and a second sliding assembly.

In practical application, the telescopic oil cylinder 73 and the swing oil cylinder 32 can be realized by adopting servo oil cylinders, and the speed can reach 1.5 m/s; the main arm luffing cylinder 51 and the folding arm luffing cylinder 52 can be realized by common cylinders, and the speed is below 0.2m/s, which is beneficial to realizing the quick positioning of the crane.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.