阅读说明：本技术 一种钢丝绳变幅起重臂防坠落装置及起重机 (Steel wire rope luffing jib loading boom anti-falling device and crane ) 是由 肖利涛 赵增林 汪涛 于 2019-09-19 设计创作，主要内容包括：本发明公开了一种钢丝绳变幅起重臂防坠落装置,包括依次铰接的第一连杆、过渡连杆和第二连杆,所述第一连杆远离过渡连杆的一端用于铰接在起重臂的重心,所述第二连杆远离过渡连杆的一端铰接缓冲机构的一端,所述缓冲机构的另一端用于铰接在起重机顶端的人字架上；所述第一连杆和第二连杆的夹角随起重臂的变幅而改变,当起重臂处于最大变幅幅度时,第一连杆和第二连杆共线；当起重臂因变幅机构失效而导致起重臂坠落时,第一连杆和第二连杆被拉直,通过缓冲机构内部的阻尼作用出力,有效缓冲起重臂坠落时的惯性力,防止臂架坠落引起的巨大惯性对起重机钢结构造成冲击损伤。(The invention discloses a wire rope amplitude-changing cargo boom anti-falling device which comprises a first connecting rod, a transition connecting rod and a second connecting rod which are sequentially hinged, wherein one end of the first connecting rod, which is far away from the transition connecting rod, is hinged to the gravity center of a cargo boom, one end of the second connecting rod, which is far away from the transition connecting rod, is hinged to one end of a buffer mechanism, and the other end of the buffer mechanism is hinged to a propeller strut at the top end of a crane; the included angle between the first connecting rod and the second connecting rod is changed along with the amplitude of the jib, and when the jib is in the maximum amplitude, the first connecting rod and the second connecting rod are collinear; when the crane boom falls due to failure of the luffing mechanism, the first connecting rod and the second connecting rod are straightened, force is exerted through the damping effect in the buffer mechanism, the inertia force when the crane boom falls is effectively buffered, and impact damage to a crane steel structure caused by huge inertia caused by falling of the crane boom is prevented.)

1. A steel wire rope amplitude-changing cargo boom anti-falling device is characterized by comprising a first connecting rod, a transition connecting rod and a second connecting rod which are sequentially hinged, wherein one end, far away from the transition connecting rod, of the first connecting rod is hinged to the gravity center of a cargo boom, one end, far away from the transition connecting rod, of the second connecting rod is hinged to one end of a buffer mechanism, and the other end of the buffer mechanism is hinged to a propeller strut at the top end of a crane; the included angle of the first connecting rod and the second connecting rod is changed along with the amplitude of the jib, and when the jib is in the maximum amplitude, the first connecting rod and the second connecting rod are collinear.

2. The wire rope luffing jib fall arrest device of claim 1 wherein the damping mechanism is a hydraulic cylinder that retards the fall rate of the jib through internal damping after the jib exceeds a maximum luffing amplitude.

3. The anti-falling device for the steel wire rope luffing jib according to claim 2, wherein the hydraulic cylinder comprises a cavity with an opening, one end of the hydraulic cylinder, which is far away from the opening, is hinged to the propeller strut, a piston is arranged in the cavity, the piston divides the cavity into a first cavity far away from the opening and a second cavity close to the opening, a piston rod is arranged on one side of the piston, which is located at the opening, the circumferential surface of the piston rod slides in cooperation with the opening, one end of the piston, which is far away from the piston, is hinged to the second connecting rod, an overflow hole is arranged on the piston rod, and when the piston rod is pulled after the first connecting rod and the second connecting rod are collinear, hydraulic oil in the second cavity flows into the second cavity through the overflow hole under the action of the piston rod, so.

4. The anti-falling device for the steel wire rope luffing jib boom of claim 3, wherein a spring is arranged in the second cavity, and the spring is sleeved on the piston rod and is compressed or extended under the action of the piston rod.

5. The wire rope luffing jib boom fall arrest device of claim 1 wherein the first link and the transition link are articulated by a first pin engaging the first bushing and the second link and the transition link are articulated by a second pin engaging the second bushing.

6. The wire rope luffing jib fall arrest device of claim 5, wherein the horizontal component of the transition link at the end near the first pin is greater than the horizontal component at the end of the second pin when the jib is at a minimum luffing amplitude.

7. The cable luffing jib fall arrest device of claim 1 further comprising a mount for mounting on the jib and isolating the circumferential surface of the first link from the jib.

8. A crane comprising a wire rope luffing jib fall arrest device as claimed in any of claims 1 to 7.

9. The crane as claimed in claim 8, further comprising a base, a propeller strut and a crane boom, wherein the crane boom is hinged on the base, the propeller strut is installed above the base, the crane boom is matched with a luffing mechanism, a steel wire rope of the luffing mechanism bypasses a pulley block at the top end of the propeller strut and is connected with the tail end of the crane boom, a first connecting rod of the steel wire rope luffing jib fall-preventing device is hinged at the gravity center of the crane boom, and a buffer mechanism is hinged on the propeller strut; the jib changes the included angle between the jib and the horizontal plane under the drive of the luffing mechanism to realize luffing.

10. The crane as claimed in claim 9, wherein the piston and cylinder of the damping mechanism do not displace relative to each other during the period when the boom is increased from the low amplitude to the maximum amplitude.

Technical Field

The application relates to the field of cranes, in particular to a steel wire rope luffing jib falling-preventing device and a crane.

Background

The steel wire rope has light amplitude dead weight and low cost, and is widely applied to the installation of a portal crane; due to the structural form of the boom, when the transmission part of the amplitude-variable steel wire rope or the amplitude-variable mechanism fails, the boom falls to the ground from a working state, so that serious safety accidents are caused.

The inventor finds that in order to improve the safety during the use process, a plurality of safety measures are added to the design of the wire rope luffing crane, such as: the safety brake is additionally arranged at the tail part of the amplitude-changing mechanism winding drum, when the driving part of the amplitude-changing mechanism fails, the amplitude-changing mechanism winding drum can be braked by the safety brake to ensure the safety of the arm support, but huge inertia force exists in the falling process of the arm support, and the forced braking mode often causes the breakage of the traction steel wire rope and is difficult to realize effective braking; in addition, a rope breakage prevention protection device is additionally arranged in the process of winding the amplitude-variable steel wire rope, so that when the amplitude-variable steel wire rope on one side is broken, the steel wire rope on the other side can also ensure the safety of the arm support, but the safety rope structure moving along with the amplitude-variable steel wire rope can cause the complexity increase of the amplitude-variable mechanism, the mutual interference of transmission structures can be easily caused, and the potential safety hazard is realized.

Disclosure of Invention

The purpose of this application is to the defect that prior art exists, provides a wire rope becomes width of cloth jib loading boom anti-falling device and hoist, through setting up link mechanism cooperation buffer gear, makes the inside damping effect of buffer gear cushion the process of falling of jib loading boom to offset the huge inertia that some jib loading boom dropped the arouse fast, slow down the process of falling of jib loading boom and finally realize safety braking and prevent to fall.

The first purpose of this application provides a wire rope becomes width of cloth jib loading boom anti-falling device, adopts following technical scheme:

the crane boom connecting device comprises a first connecting rod, a transition connecting rod and a second connecting rod which are sequentially hinged, wherein one end, far away from the transition connecting rod, of the first connecting rod is hinged to the gravity center of a crane boom, one end, far away from the transition connecting rod, of the second connecting rod is hinged to one end of a buffer mechanism, and the other end of the buffer mechanism is hinged to a propeller strut at the top end of a crane; the included angle between the first connecting rod and the second connecting rod is changed along with the amplitude of the jib, and when the jib is in the maximum amplitude, the first connecting rod and the second connecting rod are collinear; before the jib becomes amplitude from small amplitude to maximum amplitude, the buffer mechanism has no traction force on the jib.

Furthermore, the buffer mechanism is a hydraulic cylinder, and the hydraulic cylinder delays the falling speed of the crane boom through the internal damping action after the crane boom exceeds the maximum amplitude.

Furthermore, the hydraulic cylinder comprises a cavity with an opening, one end, far away from the opening, of the hydraulic cylinder is hinged to the propeller strut, a piston is matched in the cavity and divides the cavity into a first cavity far away from the opening and a second cavity close to the opening, a piston rod is matched on one side, located at the opening, of the piston, the circumferential surface of the piston rod slides in a matched mode with the opening, one end, far away from the piston, of the piston rod is hinged to a second connecting rod, an overflow hole is formed in the piston rod, and when the first connecting rod and the second connecting rod are collinear, hydraulic oil in the second cavity flows into the second cavity through the overflow hole under the action of the piston rod when the piston rod is under tension, so that the damping effect is achieved to delay.

Furthermore, a spring is arranged in the second cavity, is sleeved on the piston rod and is compressed or extended under the action of the piston rod.

Furthermore, the first connecting rod and the transition connecting rod are matched with the first sleeve to be hinged through a first pin shaft, and the second connecting rod and the transition connecting rod are matched with the second sleeve to be hinged through a second pin shaft.

Further, when the cargo boom is at the minimum amplitude, the horizontal component force of the end, close to the first pin shaft, of the transition connecting rod is larger than the horizontal component force of the end, close to the second pin shaft, of the transition connecting rod.

The support is used for being installed on the crane arm and isolating the circumferential surface of the first connecting rod from the crane arm.

The second purpose of this application is to provide a hoist, adopts following technical scheme:

the anti-falling device comprises a base, a propeller strut, a crane boom and the steel wire rope luffing crane boom anti-falling device, wherein the crane boom is hinged to the base, the propeller strut is arranged above the base, the crane boom is matched with a luffing mechanism, a steel wire rope of the luffing mechanism bypasses a pulley block at the top end of the propeller strut and is connected with the tail end of the crane boom, a first connecting rod of the steel wire rope luffing crane boom anti-falling device is hinged to the gravity center of the crane boom, and a buffer mechanism; the jib changes the included angle between the jib and the horizontal plane under the drive of the luffing mechanism to realize luffing.

Further, during the process that the lifting arm is increased from the small amplitude to the maximum amplitude, the piston and the cylinder body of the buffer mechanism do not generate relative displacement.

Compared with the prior art, the application has the advantages and positive effects that:

(1) the buffer mechanism is matched with a connecting rod structure consisting of the first connecting rod, the second connecting rod and the transition connecting rod, so that the normal operation of the crane is not interfered, when the crane boom falls due to the failure of the luffing mechanism, the first connecting rod and the second connecting rod are straightened, the force is exerted through the damping action in the buffer mechanism, the inertia force when the crane boom falls is effectively buffered, the impact damage of huge inertia caused by the falling of the crane boom to a steel structure of the crane is prevented, and the stable braking of the traction of the crane boom by the matching of the connecting rod and the buffer mechanism is finally realized in the buffering process;

(2) the pin shaft is matched with the sleeve to serve as a bearing mechanism at the hinged point, so that the friction coefficient at the hinged point is reduced, and the abrasion of the connecting rod during rotation along with the crane boom is effectively reduced;

(3) the multi-section link mechanism is selected as the transfer mechanism of the anti-falling device, so that more stable rigid pulling force can be provided compared with a transmission safety rope, a certain moving range can be kept, and the interference on the operation of other element parts of the crane can be avoided;

(4) when the crane boom operates in a normal range, the anti-falling device changes the included angle between the first connecting rod and the second connecting rod along with the amplitude of the crane boom, does not output pulling force to the crane boom, and does not obstruct or interfere with the amplitude of the crane boom; when the crane boom exceeds the maximum amplitude, the buffer mechanism starts to work, so that the inertia effect of the crane boom is absorbed, and the falling process of the crane boom is slowed down, thereby avoiding the problem of damage to the crane boom caused by overlarge impact force when the crane boom falls; compared with the forced braking of a common anti-falling structure, the instant inertia effect in the falling process is absorbed through the buffer mechanism in the continuous hydraulic cylinder piston moving process, so that the instant impact force on the human frame is reduced, and the effect of protecting the whole structure of the crane is achieved;

(5) the hydraulic cylinder is used as the buffer mechanism, so that the hydraulic cylinder can bear larger impact force compared with other buffer mechanisms, the whole volume of the buffer mechanism is reduced, and the rebound caused by elastic buffer structures such as springs is avoided, so that the problem of secondary impact on the crane caused by the rebound is solved;

(6) when the first connecting rod and the second connecting rod are arranged, when the jib is at the minimum amplitude, the horizontal component force borne by the end, close to the first pin shaft, of the transition connecting rod is larger than the horizontal component force borne by the end, close to the second pin shaft, of the transition connecting rod, so that the backward tilting force of the jib is prevented from being increased by the self weight of the connecting rod when the jib is at a small amplitude, and the stability of the jib in the amplitude-variable process is favorably ensured.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

Fig. 1 is a schematic view of the fall protection device of embodiment 1 of the present application in cooperation with a crane;

FIG. 2 is a schematic view of the combination of a boom and a first link according to the embodiment 1 of the present application;

fig. 3 is a schematic structural view of a first link according to embodiment 1 of the present application;

FIG. 4 is a schematic structural view of a pedestal according to embodiment 1 of the present application;

FIG. 5 is a schematic structural view of a transition link according to embodiment 1 of the present application;

FIG. 6 is a schematic structural view of a second link according to embodiment 1 of the present application;

FIG. 7 is a schematic structural view of a cushion device according to embodiment 1 of the present application;

fig. 8 is a schematic view of the combination of a boom and a fall arrest device according to embodiment 2 of the present application.

Wherein: 1. the hydraulic support comprises a boom connecting seat, 2, a first connecting rod, 3, a transition connecting rod, 4, a second connecting rod, 5, a buffer mechanism, 501, a hydraulic cylinder, 502, a piston rod, 503, a spring, 6, a propeller strut connecting seat, 7, a support, 8, a boom, 9 and a propeller strut.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;

for convenience of description, the words "up", "down", "left" and "right" in this application, if any, merely indicate correspondence with the directions of up, down, left and right of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

The terms "mounted", "connected", "fixed", and the like in the present application should be understood broadly, and for example, the terms "mounted", "connected", and "fixed" may be fixedly connected, detachably connected, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.

As introduced in the background art, the safety brake is added at the tail part of the amplitude transformer drum in the prior art, when the driving part of the amplitude transformer fails, the safety brake can brake the amplitude transformer drum to ensure the safety of the boom, but huge inertia force exists in the dropping process of the boom, and the forced braking mode often causes the breakage of the traction steel wire rope and is difficult to realize effective braking; in addition, a rope breakage preventing protection device is additionally arranged in the winding of the amplitude-variable steel wire rope, so that when the amplitude-variable steel wire rope on one side is broken, the steel wire rope on the other side can also ensure the safety of the arm support, but the safety rope structure moving along with the amplitude-variable steel wire rope can cause the complexity increase of the amplitude-variable mechanism, the mutual interference of transmission structures is easily caused, the potential safety hazard is realized, and the wire rope amplitude-variable jib falling preventing device and the crane are provided aiming at the technical problems.