CN112777498B

CN112777498B - Telescopic boom structure and crane

Info

Publication number: CN112777498B
Application number: CN202110307770.0A
Authority: CN
Inventors: 刘晓军; 柳志勇; 姜冠营
Original assignee: Sany Automobile Hoisting Machinery Co Ltd
Current assignee: Sany Automobile Hoisting Machinery Co Ltd
Priority date: 2021-03-23
Filing date: 2021-03-23
Publication date: 2022-07-05
Anticipated expiration: 2041-03-23
Also published as: CN112777498A

Abstract

The invention provides a telescopic boom structure and a crane. The telescopic arm structure comprises: the telescopic mechanism, the basic arm and at least one section of telescopic arm sleeved in the basic arm; the telescopic machanism includes: the oil cylinder comprises a cylinder barrel and a piston rod, and the cylinder barrel is suitable for being connected with the basic arm; the bolt device comprises a connecting piece and at least two bolt components, wherein two adjacent bolt components are connected through the connecting piece, at least one bolt component is connected with the piston rod, the at least one bolt component is arranged in the cylinder barrel in a sliding mode, and the bolt components are suitable for being connected with or separated from the telescopic arm. The telescopic arm has the advantage of reducing the possibility of failure when the oil cylinder pushes the telescopic arm to stretch.

Description

Telescopic boom structure and crane

Technical Field

The invention relates to the technical field of hoisting equipment, in particular to a telescopic boom structure and a crane.

Background

The telescopic oil cylinders of the existing single-cylinder bolt crane are all inverted oil cylinders which are arranged in a crane boom, an oil rod is fixed, and a cylinder barrel is telescopic to drive the crane boom to stretch. The telescopic boom is driven to extend through multiple times of stretching of the cylinder barrel, when the cylinder barrel extends, the end part of the cylinder barrel is connected with the telescopic boom to drive the telescopic boom to extend, when the cylinder barrel retracts, the end part of the cylinder barrel is disconnected with the telescopic boom and keeps the length of the telescopic boom, along with the re-extension of the cylinder barrel, the end part of the cylinder barrel is connected with the telescopic boom again to drive the telescopic boom to further extend, when the cylinder barrel is connected with the telescopic boom, the cylinder barrel is not in a suspended state under the support of the telescopic boom at the moment and the stress of the oil cylinder is better, but when the cylinder barrel retracts, the cylinder barrel is not connected with the telescopic boom, the cylinder barrel is in a cantilever state at the moment, the whole stress of the oil cylinder is accumulated to the position of the piston rod, the stress state of the oil cylinder is poor, and abnormity or fault easily occurs to the oil cylinder.

Disclosure of Invention

The invention solves the problem of how to reduce the possibility of failure when the oil cylinder pushes the telescopic arm to stretch.

To solve the above problems, the present invention provides a telescopic boom structure, comprising: the telescopic mechanism, the basic arm and at least one section of telescopic arm sleeved in the basic arm; the telescopic mechanism comprises:

the oil cylinder comprises a cylinder barrel and a piston rod, and the cylinder barrel is suitable for being connected with the basic arm;

the bolt device comprises a connecting piece and at least two bolt components, wherein every two adjacent bolt components are connected through the connecting piece, at least one bolt component is connected with the piston rod, at least one bolt component is arranged in the cylinder barrel in a sliding mode, and the bolt components are suitable for being connected with or separated from the telescopic arm.

Optionally, the bolt assembly includes an installation block and a cylinder pin, the installation blocks of two adjacent bolt assemblies are connected through the connecting piece, the installation block is connected with the piston rod or slidably disposed in the cylinder barrel, the cylinder pin is telescopically disposed in the installation block, and the installation block is adapted to be connected with the telescopic arm through the cylinder pin.

Optionally, the cylinder barrel is connected with an inner end face of the basic arm, a central hole for the oil cylinder to pass through is formed in an end face of the telescopic arm, and a cylinder pin hole is formed in a hole wall of the central hole and is suitable for the bolt assembly to insert.

Optionally, this telescopic arm subassembly still includes the guide rail, the guide rail is located the outer wall of cylinder, the connecting piece includes the sliding sleeve, the sliding sleeve is connected adjacently the installation piece, just the sliding sleeve slide set up in the guide rail.

Optionally, the cross section of the guide rail is trapezoidal, dovetail-shaped or T-shaped, and the sliding sleeve is matched with the guide rail.

Optionally, the sliding sleeve includes two first limiting plates and a plurality of second limiting plate, two first limiting plate interval sets up and is located respectively the relative both sides of guide rail, and is a plurality of the second limiting plate all with the guide rail deviates from the side of cylinder is contradicted, and two first limiting plate deviates from the side of cylinder all with a plurality of second limiting plate is connected.

Optionally, two the side that first limiting plate faced each other all is equipped with first stopper, first stopper with the lateral wall shape of guide rail cooperatees.

Optionally, the sliding sleeve still includes two mounting panels, two the mounting panel interval sets up and is located two respectively one side that first limiting plate deviates from each other, the relative both ends face of second limiting plate respectively with two the mounting panel is connected.

Optionally, the telescopic arm structure further comprises an outer rail, the outer rail is arranged at the central hole, and the mounting plate is adapted to be slidably arranged in the outer rail.

Compared with the prior art, the telescopic boom structure has the beneficial effects that: the cylinder barrel of the oil cylinder is fixed on the basic arm, so that the cylinder barrel mainly bears stress, the stress of the oil cylinder is good, and the oil cylinder is not easy to break down. Along with the piston rod is flexible, the bolt subassembly removes thereupon, and gliding bolt subassembly is moving the in-process on the cylinder, and the direction is difficult for the incline, because the bolt subassembly is connected by the connecting piece, a plurality of bolt subassemblies are all moving the in-process and are difficult for the incline, flexible arm is at flexible process more stable, during the bolt subassembly atress, the connecting piece will do all on final transmission to the cylinder of power, has shared the atress on the piston rod, the hydro-cylinder is difficult for appearing unusual damage even.

The invention also provides a crane, which comprises the telescopic arm structure.

Compared with the prior art, the crane has the beneficial effects consistent with those of the telescopic arm structure, and is not repeated herein.

Drawings

FIG. 1 is a schematic view of the overall structure of a telescopic mechanism according to an embodiment of the present invention;

FIG. 2 is a front view of a telescoping mechanism in an embodiment of the invention;

FIG. 3 is a top view of a telescoping mechanism in an embodiment of the invention;

FIG. 4 is a side view of a telescoping mechanism in an embodiment of the invention;

FIG. 5 is a schematic structural diagram of an oil cylinder in the embodiment of the present invention;

FIG. 6 is a schematic view of the telescoping mechanism in an embodiment of the invention;

FIG. 7 is a cross-sectional view of a telescopic arm structure according to an embodiment of the present invention;

FIG. 8 is a schematic illustration of a telescoping arm and base arm according to an embodiment of the present invention;

FIG. 9 is a schematic view of an initial state of an embodiment of the invention with a section of arm ready for a first extension;

FIG. 10 is a schematic view of an embodiment of the present invention with a segment arm ready for a first extension;

FIG. 11 is a schematic view of an initial state of a segment arm ready for a second extension in accordance with an embodiment of the present invention;

FIG. 12 is a schematic view of an embodiment of the invention with a segment arm ready for a second extension;

FIG. 13 is a schematic view of the latch assembly in preparation for a retracted state in accordance with an embodiment of the present invention;

FIG. 14 is a schematic view of an embodiment of the present invention with the telescoping arm fully extended;

fig. 15 is a schematic diagram illustrating the deformation of the cylinder itself in the retracted state according to the embodiment of the present invention.

Description of reference numerals:

1. an oil cylinder; 101. a cylinder barrel; 102. a piston rod; 2. a plug pin assembly; 201. a cylinder pin; 202. mounting blocks; 203. a cylinder pin hole; 3. a sliding sleeve; 301. mounting a plate; 302. a first limit plate; 3021. a first stopper; 303. a second limiting plate; 3031. a second limiting block; 4. a guide rail; 401. a chute; 5. a slider; 6. a reinforcing block; 7. a base arm; 8. a telescopic arm; 9. a central bore; 1001. an arm pin; 1002. an arm pin hole; 11-outer track.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the description of the present invention, it is to be understood that the forward direction of "X" in the drawings represents the right direction, and correspondingly, the reverse direction of "X" represents the left direction; the forward direction of "Y" represents forward, and correspondingly, the reverse direction of "Y" represents rearward; the forward direction of "Z" represents the upward direction, and correspondingly, the reverse direction of "Z" represents the downward direction, and the directions or positional relationships indicated by the terms "X", "Y", "Z", etc. are based on the directions or positional relationships shown in the drawings of the specification, and are only for convenience of describing and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular direction, be constructed and operated in a particular direction, and thus should not be construed as limiting the present invention. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the description of the present invention, it should be noted that terms such as "upper", "lower", "front", "rear", and the like in the embodiments indicate orientation words, which are used for simplifying the description of positional relationships based on the drawings of the specification, and do not represent that elements, devices, and the like which are referred to must operate according to specific orientations and defined operations and methods, configurations in the specification, and such orientation terms do not constitute limitations of the present invention.

In addition, the terms "first" and "second" mentioned in the embodiments of the present invention are only used for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

An embodiment of the present invention provides a telescopic boom structure, including: the telescopic mechanism, the basic arm 7 and at least one section of telescopic arm 8 sleeved in the basic arm 7; the telescopic machanism includes:

a cylinder 1 comprising a cylinder 101 and a piston rod 102, the cylinder 101 being adapted to be connected to the base arm 7;

the bolt device comprises a connecting piece and at least two bolt assemblies 2, the two adjacent bolt assemblies 2 are connected through the connecting piece, at least one bolt assembly 2 is connected with the piston rod 102, the at least one bolt assembly 2 is arranged on the cylinder barrel 101 in a sliding mode, and the bolt assemblies 2 are suitable for being connected with or separated from the telescopic arm 8.

Referring to fig. 1 to 3 and 6, the telescopic mechanism is disposed in the base arm 7 and drives the telescopic arm 8 to extend and retract relative to the base arm 7. The cylinder 1 includes a cylinder 101 and a piston rod 102, and the piston rod 102 extends and retracts reciprocally in the cylinder 101. One end of the cylinder 101 is fixed to the inner end surface of the base arm 7 by bolting, welding, or pinning, and in this embodiment, the cylinder 101 is fixed to the base arm 7 by bolting, preferably, 6 bolts. The bolt device is arranged on the oil cylinder 1 and comprises a connecting piece and at least two bolt assemblies 2, in the embodiment, the bolt assemblies 2 are arranged in two groups, the two groups of bolt assemblies 2 are connected through the connecting piece, one group of bolt assemblies 2 is connected with the piston rod 102, the other group of bolt assemblies 2 is arranged on the cylinder barrel 101 in a sliding mode, and meanwhile the connecting piece is also arranged on the cylinder barrel 101 in a sliding mode. In other embodiments, the pin assemblies 2 may also be provided in multiple sets, adjacent pin assemblies 2 are connected by a connecting member, at least one set of pin assemblies 2 is connected to the piston rod 102, and at least one set of pin assemblies 2 is slidably disposed on the cylinder 101. As piston rod 102 extends and retracts, latch assembly 2 is caused to reciprocate.

Referring to fig. 1 and 2, the bolt assembly 2 is used for being connected with or separated from the telescopic arm 8, when the telescopic arm 8 is extended, the bolt assembly 2 is connected with the telescopic arm 8, the telescopic arm 8 is driven by the bolt assembly 2 to extend out along with the extension of the piston rod 102, and the length of the telescopic arm 8 driven to extend out is smaller than the maximum extension length of the telescopic arm 8 at each time, after the piston rod 102 drives the telescopic arm 8 to extend out once, the bolt assembly 2 is separated from the connection with the telescopic arm 8, the piston rod 102 retracts back, and then along with the extension of the piston rod 102, other bolt assemblies 2 are connected with the telescopic arm 8, so as to further drive the telescopic arm 8 to extend out, therefore, along with the reciprocating extension of the piston rod 102, the bolt assembly 2 and the telescopic arm 8 are connected in sequence through a plurality of different bolts, and the telescopic arm 8 is driven to gradually extend out. In this embodiment, the bolt assembly 2 slidably disposed on the cylinder 101 is connected to the telescopic arm 8 to drive the telescopic arm 8 to extend, and then the bolt assembly 2 connected to the piston rod 102 is connected to the telescopic arm 8 to drive the telescopic arm 8 to extend.

With the arrangement, the oil cylinder 1 drives the telescopic arm 8 to extend out through multiple times of extension, and the stroke of the oil cylinder 1 can be adaptively shortened. Because the oil cylinder 1 is short and small, the manufacturing difficulty is low, the hydraulic oil for starting the oil cylinder 1 to run can be reduced, the space for installing the hydraulic oil for the vehicle body of the telescopic mechanism is small, and the space is saved, so that the appearance and the weight of the whole vehicle are designed conveniently. The cylinder 101 of the oil cylinder 1 is fixed on the basic arm 7, so the cylinder 101 mainly bears the stress, and the oil cylinder 1 has better stress and is not easy to break down. As the piston rod 102 extends, the latch assembly 2 moves therewith, and the latch assembly 2 sliding on the cylinder 101 is not easily deflected during movement. Because bolt subassembly 2 is connected by the connecting piece, a plurality of bolt subassemblies 2 are all at the difficult skew of removal in-process, and flexible arm 8 is more stable at flexible process. When the bolt component 2 is stressed, the connecting piece finally transmits the force to the cylinder barrel 101, the stress on the piston rod 102 is shared, and the oil cylinder 1 is not easy to be abnormal or even damaged.

Optionally, the bolt assemblies 2 comprise mounting blocks 202 and cylinder pins 201, the mounting blocks 202 of two adjacent bolt assemblies 2 are connected through a connecting piece, the mounting blocks 202 are connected with the piston rod 102 or slidably arranged on the cylinder barrel 101, the cylinder pins 201 are telescopically arranged on the mounting blocks 202, and the mounting blocks 202 are suitable for being connected with the telescopic arms 8 through the cylinder pins 201.

Referring to fig. 1 and 2, in which the latch assembly 2 includes a mounting block 202 and cylinder pins 201, in this embodiment, four cylinder pins 201 are provided on each mounting block 202, two cylinder pins 201 are provided on two opposite side surfaces of the mounting block 202, the cylinder pins 201 are telescopically provided on the mounting block 202, and the cylinder pins 201 are telescopically driven by a hydraulic cylinder, when the latch assembly 2 is connected with the telescopic arm 8, the cylinder pins 201 extend out of the mounting block 202, and when the latch assembly 2 is separated from the telescopic arm 8, the cylinder pins 201 are retracted into the mounting block 202. In the present embodiment, two mounting blocks 202 are connected by a connector, one mounting block 202 is slidably disposed on the cylinder 101, the other mounting block 202 is fixed to the end of the piston rod 102, and the mounting block 202 is fixed to the piston rod 102 by a bolt.

Optionally, the cylinder 101 is connected to the inner end face of the base arm 7, the end face of the telescopic arm 8 is provided with a central hole 9 for the oil cylinder 1 to pass through, and the hole wall of the central hole 9 is provided with a cylinder pin hole 203, and the cylinder pin hole 203 is suitable for the bolt assembly 2 to insert.

Referring to fig. 7 to 9, in the present embodiment, the telescopic arm 8 is provided with three segments. In other embodiments, the number of telescopic arms 8 may be other numbers. The three-section telescopic arm 8 is sleeved in the basic arm 7, and the three-section telescopic arm 8 sequentially comprises a first section arm, a second section arm and a third section arm according to the sequence from inside to outside, wherein the first section arm is sleeved in the second section arm, the second section arm is sleeved in the third section arm, and the three section arm is sleeved in the basic arm 7. In this embodiment, the circumferential side walls of the basic arm 7 and the telescopic arm 8 are welded or integrally formed by four side plates, and the four side plates surround the basic arm 7 or the telescopic arm 8. Wherein three side plates are flat plates, and one side plate of the basic arm 7 and the telescopic arm 8 is arc-shaped. The cylinder 101 of the telescopic mechanism is fixed with the inner end surface of the basic arm 7 through bolts, the length of the oil cylinder 1 is consistent with that of the basic arm 7, and the oil cylinder 1 is positioned inside the basic arm 7. The terminal surface of flexible arm 8 all sets up the centre bore 9 that supplies hydro-cylinder 1 to pass, and the bolt subassembly 2 in the telescopic machanism and slider 5 all can be through centre bore 9. The hole wall of the central hole 9 is provided with cylinder pin holes 203 corresponding to the number of the cylinder pins 201 of the bolt component 2, the cylinder pins 201 of the bolt component 2 extend out and are inserted into the cylinder pin holes 203, so that the connection between the bolt component 2 and the telescopic arm 8 is completed, and the telescopic arm 8 is driven to stretch along with the stretching of the piston rod 102.

By the arrangement, when the telescopic arm 8 is driven to stretch, the pin assembly 2 is driven by the piston rod 102 to move, the pin assembly 2 is arranged in the central hole 9 and is matched with the cylinder pin hole 203, so that the piston rod 102 and the telescopic arm 8 can be connected conveniently, and the pin assembly 2 is supported by the hole wall of the central hole 9, so that when the telescopic arm 8 is driven to extend, the oil cylinder 1 is not in a cantilever state, the oil cylinder 1 is better in stress state, and is not easy to be abnormal or even break down.

Referring to fig. 8 and 9, the inner side surfaces of the telescopic arm 8 and the base arm 7 are provided with arm pin holes 1002, and in the present embodiment, since one arm segment is positioned at the innermost portion, the arm pin holes 1002 are not provided. Arm pins 1001 are arranged on the outer side surfaces of the telescopic arms 8, the arm pins 1001 are driven by hydraulic cylinders, and when the telescopic arms 8 are connected with each other and/or the telescopic arms 8 are connected with the basic arm 7, the arm pins 1001 on the telescopic arms 8 are matched with the arm pin holes 1002 of the adjacent telescopic arms 8, or the arm pins 1001 on the telescopic arms 8 are matched with the arm pin holes 1002 on the basic arm 7, so that the relative motion between the telescopic arms 8 and the basic arm 7 is limited. In this embodiment, three sets of arm pin holes 1002 are provided in the basic arm 7 and the telescopic arm 8, the three sets of arm pin holes 1002 are uniformly spaced, and the three sets of arm pin holes 1002 are provided along the length direction of the basic arm 7. In this embodiment, there are four arm pin holes 1002 in each group, and each of the four arm pin holes 1002 is disposed on two opposite side surfaces of the basic arm 7 or the telescopic arm 8. In other embodiments, the number of sets and number of arm pin holes 1002 may be other numbers. Three sets of arm pins 1001 are provided in the telescopic arm 8, three sets of arm pins 1001 are provided at intervals in the longitudinal direction of the telescopic arm 8, the number of each set of arm pins 1001 is four according to the number of arm pin holes 1002, and four arm pins 1001 are provided on the opposite side surfaces of the telescopic arm 8, respectively. In other embodiments, the number of sets and number of arm pins 1001 may be provided in other numbers.

The jib is extended by extending the piston rod 102 until the sliding pin assembly 2 on the cylinder 101 is positioned in the centre hole 9 of the one-piece jib, as shown in fig. 8 and 9, so that the sliding pin assembly 2 on the cylinder 101 fits into the cylinder pin hole 203 of the centre hole 9 of the one-piece jib. As shown in fig. 10, the piston rod 102 is extended further to the maximum stroke, pushing the first arm to extend for the first time, and the arm pin 1001 on the first arm is engaged with the arm pin hole 1002 on the second arm to limit the movement of the first arm. As shown in fig. 11, as the piston rod 102 is retracted until the latch pin assembly 2 coupled to the piston rod 102 is disposed in the center hole 9 of the one-joint arm, the latch pin assembly 2 of the piston rod 102 is engaged with the cylinder pin hole 203 of the one-joint arm, and the arm pin 1001 between the one-joint arm and the two-joint arm is unlocked. As shown in fig. 12, as the piston rod 102 is extended, the one-joint arm is extended a second time to facilitate complete extension of the one-joint arm, and finally the arm pin 1001 between the one-joint arm and the two-joint arm is locked to restrict relative movement between the one-joint arm and the two-joint arm to complete extension of the one-joint arm. As shown in fig. 13, after the one-section arm is completely extended, the piston rod 102 retracts until the pin assembly 2 on the cylinder 101 is placed in the central hole 9 of the two-section arm, and the extending process of the two-section arm and the three-section arm can be started, which is similar to the one-section arm and will not be described again. As shown in fig. 14, eventually the telescopic arms 8 are all extended.

Optionally, the telescopic boom structure further includes a guide rail 4, the guide rail 4 is disposed on an outer wall of the cylinder 101, the connecting member includes a sliding sleeve 3, the sliding sleeve 3 connects the adjacent mounting blocks 202, and the sliding sleeve 3 is slidably disposed on the guide rail 4.

Referring to fig. 1 and 5, the guide rail 4 is fixed on the outer wall of the cylinder 101, in this embodiment, the guide rail 4 and the cylinder 101 are welded and fixed, and the length direction of the guide rail 4 is the same as the length direction of the cylinder 101. The connecting piece includes sliding sleeve 3, and sliding sleeve 3's both ends are installed piece 202 respectively and are passed through the bolt fastening, and sliding sleeve 3 slides and sets up on guide rail 4.

Set up like this, when piston rod 102 drove bolt subassembly 2 and slides, because sliding sleeve 3 and the cooperation of guide rail 4, bolt subassembly 2 and the gliding direction of sliding sleeve 3 are restricted, all slide along the length direction of hydro-cylinder 1, the difficult inclined possibility that appears, and piston rod 102 is restricted and is rotated, and installation piece 202 is difficult for discovering the rotation, and when bolt and flexible arm 8 cooperate, the difficult dislocation that appears and is difficult to connect the condition of flexible arm 8. And when the bolt assembly 2 is not connected with the telescopic arm 8, referring to fig. 13, the bolt assembly 2 at the end of the piston rod 102 is connected by the sliding sleeve 3, the sliding sleeve 3 supports the bolt assembly 2 at the end of the piston rod 102 and the extended piston rod 102, the sliding sleeve 3 is convenient for transferring stress to the cylinder barrel 101, so that the activity of the piston rod 102 is reduced, the stress of the oil cylinder 1 is optimized, and the oil cylinder 1 is not easy to deform under stress and break down.

Optionally, the cross section of the guide rail 4 is trapezoidal, dovetail-shaped or T-shaped, and the sliding sleeve 3 is matched with the guide rail 4.

Optionally, the sliding sleeve 3 includes two first limiting plates 302 and a plurality of second limiting plate 303, and two first limiting plates 302 set up at the interval and are located the relative both sides of guide rail 4 respectively, and a plurality of second limiting plates 303 all contradict with the side that guide rail 4 deviates from the cylinder 101, and the side that two first limiting plates 302 deviate from the cylinder 101 all is connected with a plurality of second limiting plates 303.

Optionally, the mutually facing sides of the two first limiting plates 302 are provided with first limiting blocks 3021, and the first limiting blocks 3021 are matched with the side walls of the guide rail 4 in shape.

Optionally, the sliding sleeve 3 further includes two mounting plates 301, the two mounting plates 301 are disposed at an interval and located on one side of the two first limiting plates 302 that depart from each other, and two opposite end faces of the second limiting plate 303 are connected with the two mounting plates 301 respectively.

Referring to fig. 4 and 5, the cross section of the guide rail 4 is in a trapezoid, dovetail or T-shaped configuration, in this embodiment, the cross section of the guide rail 4 is preferably in a T-shaped configuration, and the area of the side surface of the guide rail 4 facing away from the cylinder 101 is larger than the area of the fixed side surface of the guide rail 4 and the cylinder 101. The sliding sleeve 3 comprises two opposite mounting plates 301, in this embodiment, the mounting plates 301 are preferably C-shaped channel steel, and the openings of the two mounting plates 301 are opposite. Two ends of the two mounting plates 301 are fixed to the mounting blocks 202 of the two bolt assemblies 2 by bolts, respectively. The sliding sleeve 3 further comprises two first limiting plates 302 and a plurality of second limiting plates 303. The second limiting plates 303 are arranged at intervals, and two ends of each second limiting plate 303 are welded and fixed with the two mounting plates 301 or fixed by bolts, so that the two mounting plates 301 are connected by the second limiting plates 303. The second stopper plates 303 are abutted against the side of the guide rail 4 away from the cylinder 101. Two first limiting plates 302 are just right to be set up, and first limiting plate 302 is fixed with a plurality of second limiting plate 303 welded fastening or bolt fastening, and the length direction of first limiting plate 302 is unanimous with the length direction of guide rail 4, and two first limiting plates 302 are located the relative both sides of guide rail 4 respectively.

Referring to fig. 4, the mutually facing sides of the first limiting plates 302 are all fixed with first limiting blocks 3021, the first limiting blocks 3021 are matched with the side of the guide rail 4 in shape, and the first limiting plates 302 are limited from being separated from the guide rail 4 by matching the first limiting blocks 3021 with the guide rail 4. The first limiting blocks 3021 on the two first limiting plates 302 clamp the guide rail 4 therebetween, so that the sliding sleeve 3 is not easily separated from the guide rail 4 during the sliding process. The side of guide rail 4 and the butt of second limiting plate 303 has seted up spout 401, and the length direction of spout 401 is unanimous with the length direction of guide rail 4, and second limiting plate 303 is fixed with second stopper 3031 towards the side of guide rail 4, and second stopper 3031 and second limiting plate 303 integrated into one piece or welded fastening. The second limit block 3031 is slidably disposed in the sliding groove 401, so that the sliding stability of the sliding sleeve 3 on the guide rail 4 is further improved by the cooperation of the second limit block 3031 and the sliding groove 401.

Optionally, the telescopic arm structure further comprises an outer track 11, the outer track 11 being provided at the central hole 9, the mounting plate 301 being adapted to be slidably arranged within the outer track 11.

Referring to fig. 7, the crane boom further includes an outer rail, in this embodiment, the outer rail includes four angle steels, the length directions of the four angle steels are all the same as the length direction of the telescopic boom 8, and the angle steels are all fixed in the central hole 9 by bolts or welding. The sliding sleeve 3 of the bolt component 2 is positioned between the four angle steels, and the sliding sleeve 3 is arranged in the outer track in a sliding manner. Each mounting plate 301 is disposed between two angles such that the mounting plate 301 is slidably disposed within the outer track 11.

Set up like this, when hydro-cylinder 1 passed centre bore 9, the sliding sleeve 3 place in outer track 11 this moment in, outer track 11 is spacing to the position of sliding sleeve 3, and outer track 11 supports sliding sleeve 3, and supports hydro-cylinder 1, has alleviateed the atress of cylinder 101 tip, and has optimized the stress of hydro-cylinder 1.

Optionally, the telescopic arm structure further comprises a sliding block 5, the sliding block 5 is connected with the bolt assembly 2, and when the bolt assembly 2 is disconnected with the telescopic arm 8, the sliding block 5 is suitable for being arranged on the inner wall of the telescopic arm 8 or the basic arm 7 in a sliding mode.

Referring to fig. 2, in this embodiment, the sliding block 5 is fixed on the mounting block 202 of the latch assembly 2 by a bolt, and in this embodiment, one sliding block 5 is provided, and the sliding block 5 is fixed on the mounting block 202 fixed with the piston rod 102. When the piston rod 102 retracts, the latch pin assemblies 2 are disconnected from the telescopic arm 8 at the moment, so that the oil cylinder 1 is in a cantilever state at the moment, as shown in fig. 13, at the moment, because the piston rod 102 extends out, the length of the oil cylinder 1 is long, and the oil cylinder 1 is easy to bend under the action of self gravity, as shown in fig. 15, at the moment, the sliding block 5 is overlapped on the inner wall of the telescopic arm 8 or the basic arm 7 along with the bending of the oil cylinder 1 to replace the contact of the latch pin assemblies 2 with the inner wall of the telescopic arm 8 or the basic arm 7, and the sliding block 5 supports the oil cylinder 1. The oil cylinder 1 is not easy to bend excessively to cause abnormity, and the sliding block 5 replaces the bolt component 2 to be in contact with the telescopic arm 8 or the basic arm 7, so that the abrasion of the bolt component 2 is reduced. The corner of the sliding block 5 is in chamfer transition, when the oil cylinder 1 is in a cantilever state and is bent, the sliding block 5 can be contacted with the end part of the telescopic arm 8 through a chamfer surface along with the sliding of the bolt component 2 driven by the piston rod 102, and the sliding block 5 can conveniently penetrate into the central hole 9.

Optionally, the telescopic arm structure further comprises a reinforcing block 6, the reinforcing block 6 is arranged on the outer side surface of the cylinder barrel 101, and the reinforcing block 6 is suitable for being connected with the end surface of the basic arm 7.

Referring to fig. 2, in the present embodiment, one reinforcing block 6 is provided, and in other embodiments, a plurality of reinforcing blocks 6 may be provided. The reinforcing block 6 is fixed to the circumferential side wall of the cylinder 101 by welding or bolts, and the reinforcing block 6 is provided near the end of the cylinder 101. When the end of the cylinder tube 101 is fixed to the base arm 7, the reinforcing block 6 also abuts against the inner end surface of the base arm 7 at this time, and the reinforcing block 6 can be fixed to the inner end surface of the base arm 7. Therefore, the connection surface between the cylinder 101 and the base arm 7 is increased, and the fixing strength between the cylinder 101 and the base arm 7 is improved.

Another embodiment of the invention provides a crane comprising a telescopic arm structure as described above.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to fall within the scope of the present disclosure.

Claims

1. A telescopic arm structure, comprising: the telescopic mechanism, the basic arm (7) and at least one section of telescopic arm (8) sleeved in the basic arm (7); the telescopic mechanism comprises:

a cylinder (1) comprising a cylinder barrel (101) and a piston rod (102), said cylinder barrel (101) being adapted to be connected to said basic arm (7);

the bolt device comprises a connecting piece and at least two bolt components (2), wherein every two adjacent bolt components (2) are connected through the connecting piece, at least one bolt component (2) is connected with the piston rod (102), at least one bolt component (2) is arranged on the cylinder barrel (101) in a sliding mode, and the bolt components (2) are suitable for being connected with or separated from the telescopic arm (8).

2. The telescopic arm structure according to claim 1, characterized in that the bolt assemblies (2) comprise mounting blocks (202) and cylinder pins (201), the mounting blocks (202) of two adjacent bolt assemblies (2) are connected through the connecting piece, the mounting blocks (202) are connected with the piston rod (102) or slidably arranged on the cylinder barrel (101), the cylinder pins (201) are telescopically arranged on the mounting blocks (202), and the mounting blocks (202) are suitable for being connected with the telescopic arm (8) through the cylinder pins (201).

3. The telescopic arm structure according to claim 2, characterized in that the cylinder barrel (101) is connected with the inner end surface of the basic arm (7), the end surface of the telescopic arm (8) is provided with a central hole (9) for the oil cylinder (1) to pass through, the hole wall of the central hole (9) is provided with a cylinder pin hole (203), and the cylinder pin hole (203) is suitable for the bolt component (2) to insert.

4. The telescopic arm structure according to claim 3, further comprising a guide rail (4), wherein the guide rail (4) is disposed on an outer wall of the cylinder (101), the connecting member comprises a sliding sleeve (3), the sliding sleeve (3) is connected to the adjacent mounting block (202), and the sliding sleeve (3) is slidably disposed on the guide rail (4).

5. The telescopic arm structure according to claim 4, characterized in that the cross section of the guide rail (4) is trapezoidal, dovetail-shaped or T-shaped, and the sliding sleeve (3) is matched with the guide rail (4).

6. The telescopic arm structure according to claim 5, wherein the sliding sleeve (3) comprises two first limiting plates (302) and a plurality of second limiting plates (303), the two first limiting plates (302) are arranged at intervals and are respectively located on two opposite sides of the guide rail (4), the plurality of second limiting plates (303) are abutted against the side face, deviating from the cylinder barrel (101), of the guide rail (4), and the side face, deviating from the cylinder barrel (101), of the two first limiting plates (302) is connected with the plurality of second limiting plates (303).

7. The telescopic arm structure according to claim 6, characterized in that the two mutually facing sides of the first stop plates (302) are provided with first stop blocks (3021), and the first stop blocks (3021) are matched with the shape of the side wall of the guide rail (4).

8. The telescopic arm structure according to claim 6, wherein the sliding sleeve (3) further comprises two mounting plates (301), the two mounting plates (301) are arranged at intervals and are respectively located on one side of the two first limiting plates (302) which are away from each other, and two opposite end faces of the second limiting plate (303) are respectively connected with the two mounting plates (301).

9. A telescopic arm structure according to claim 8, further comprising an outer track (11), said outer track (11) being provided at said central hole (9), said mounting plate (301) being adapted to be slidingly provided within said outer track (11).

10. A crane comprising a telescopic arm structure as claimed in any one of claims 1 to 9.