CN113292006B - Anti-falling control method for cargo platform - Google Patents
Anti-falling control method for cargo platform Download PDFInfo
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- CN113292006B CN113292006B CN202110400253.8A CN202110400253A CN113292006B CN 113292006 B CN113292006 B CN 113292006B CN 202110400253 A CN202110400253 A CN 202110400253A CN 113292006 B CN113292006 B CN 113292006B
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- carrying platform
- lifting
- cargo carrying
- chain
- connecting rod
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/02—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms suspended from ropes, cables, or chains or screws and movable along pillars
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/28—Constructional details, e.g. end stops, pivoting supporting members, sliding runners adjustable to load dimensions
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The anti-falling control method for the cargo carrying platform is characterized in that cam-type anti-falling mechanisms symmetrically distributed along two sides of a guide rail are designed, so that the requirement on the pre-installation debugging precision of the anti-falling mechanisms is lowered, the adaptability for coping with the stress balance and the running state of the cargo carrying platform is improved, the starting interval time of the anti-falling mechanisms is effectively shortened, and the stability of bearing equipment is improved. When the lifting chain is broken or damaged, the connecting rod slides downwards along the guide post under the combined action of the self gravity and the return elastic force of the first spring, so that the detection block enters the induction range of the proximity switch to trigger an electric alarm; under the drive of the connecting rod, the first screw rod moves downwards and pushes the swing arm, meanwhile, the swing arm swings and rotates under the action of the reset elastic force of the second spring, and the cam rotates around the axial center line of the mandrel until contacting with the guide rail to realize rail holding self-locking.
Description
Technical Field
The invention relates to an anti-falling control method for a cargo carrying platform by using a cam anti-falling mechanism, and belongs to the field of logistics storage.
Background
At present, in the operation and transportation site of the three-dimensional logistics storage, various types of cargo carrying equipment which is pulled by a rope belt to be vertically lifted are generally used, and cargoes are transmitted between different working heights through the cargo carrying equipment.
The existing load bearing part of the load bearing platform usually adopts a steel wire rope or a hoisting chain, after the load bearing part is used under a large load for a long time, the potential safety hazard that the load bearing part is locally damaged or even broken exists, at the moment, the load bearing platform freely falls, so that a serious safety accident is caused, and the damage is caused to operating personnel and other equipment in the field environment.
The patent is a domestic patent previously filed by the applicant, application No. CN201910773054.4, which is named as a cargo carrying platform with a novel anti-falling mechanism and a method thereof, and comprises an anti-falling guide rail and a lifting anti-falling device connected with a cargo carrying platform bearing part. The lifting anti-falling device is arranged on a side arm of the cargo carrying platform and comprises a lever, one end of the lever is connected to a bearing part of the cargo carrying platform, the other end of the lever is connected to a mandrel of the sliding block, and a group of connecting rod shafts are arranged on the sliding block in the direction opposite to the mandrel; a group of guide posts penetrate and are installed in the vertical direction of the sliding block, and the guide posts are sleeved with return springs; the vertical two sides of the sliding block and the return spring and the upper and lower shaft ends of the connecting rod shaft are respectively connected with 1 group of anti-falling guide post seats; the anti-falling guide post seat is arranged on one side of the anti-falling base plate through bolts, and 2 groups of braking inclined blocks are arranged on the other side of the anti-falling base plate; the connecting rod shaft penetrates through the anti-falling base plate and is positioned between the 2 groups of braking inclined blocks, an idler shaft is installed at the shaft end of the connecting rod shaft, and a braking idler wheel is hung at the end part of the idler shaft. Under the normal operating condition, the lever is connected with the goods carrying platform bearing part, and under the action of lifting force, the lever enables the sliding block to be always in the state of pressing the return spring, so that larger pre-tightening traction force is generated. Under the action of traction force, the brake idle wheel arranged on the sliding block is always in an open state, and at the moment, the brake idle wheel is not in contact with the anti-falling guide rail. Once the load-bearing part of the cargo bed is broken, the lifting anti-falling device is started, the traction force transmitted by the load-bearing part of the cargo bed disappears, the potential energy accumulated by the reset spring is released to jack the slide block, the brake idle wheel is jacked, the distance between the brake idle wheels is reduced along with the narrowing of the inclined blocks at the two sides until the anti-falling guide rail is clamped to stop sliding, and finally the cargo bed is stably and automatically locked on the anti-falling guide rail.
The above prior art adopts the lever to link the rope belt from one side and the slider from the other side, and the traction force of the rope belt and the restoring force of the return spring are transmitted to the slider, so that the brake idle wheel is driven to lift along the inclined block, and the angle steel is locked along with the reduction of the clearance of the inclined block. Because the mandrel is not on the symmetrical center line of two guide pillars providing guidance for the sliding block, in the process of preventing falling and starting, the force transmitted to the sliding block by the lever can not be consistent with the rope belt fracture and the falling direction of the cargo carrying platform, and an included angle exists, the force can be decomposed into vertical force for enabling the sliding block to move up and down and horizontal force perpendicular to the guide pillars, the horizontal force enables the friction force between the sliding block and the guide pillars to be increased, so that the sliding block is prevented from sliding, when the rope belt fractures, the falling prevention mechanism is started to have certain time delay, and therefore the safety performance is further improved. In addition, the structure for triggering the anti-falling device to start by the lever is asymmetrical, the structure comprises more parts, the installation is relatively complex, the requirement on the pre-installation and debugging precision of the equipment is high, the unbalanced stress of the lever and the further delay of the start of the anti-falling mechanism are easily caused by the unbalanced load of the cargo carrying platform, and obvious restriction and application limitation are obviously caused to the miniaturization and fine design of the existing equipment and the optimization of a three-dimensional storage operation site.
In view of this, the present patent application is specifically proposed.
Disclosure of Invention
The invention discloses an anti-falling control method for a cargo carrying platform, which aims to solve the problems in the prior art and design a cam type anti-falling mechanism which is symmetrically distributed along two sides of a guide rail so as to reduce the requirement on the pre-installation and debugging precision of the anti-falling mechanism, improve the adaptability for coping with the stress balance and the running state of the cargo carrying platform, effectively shorten the starting interval time of the anti-falling mechanism and improve the stability of bearing equipment.
In order to achieve the design purpose, in the anti-falling control method of the cargo carrying platform, when the cargo carrying platform is dragged by the lifting chain to move up and down along the guide rail, the lifting force of the lifting chain is transmitted to the connecting rod through the lifting screw rod on the inner side of the side arm of the cargo carrying platform, the connecting rod is lifted to the top end of the guide rod, the first spring connected to the end plate is stretched, and the detection block is separated from the sensing range of the proximity switch;
on the outer side of the side arm of the cargo carrying platform, a connecting rod pulls up a swing arm through a first screw rod along the vertical direction, and 2 groups of cams respectively keep certain gaps with a guide rail;
when the lifting chain is broken or damaged, the connecting rod slides downwards along the guide post under the combined action of the self gravity and the return elastic force of the first spring, so that the detection block enters the induction range of the proximity switch to trigger an electric alarm;
under the drive of the connecting rod, the first screw rod moves downwards and pushes the swing arm, meanwhile, the swing arm swings and rotates under the action of the reset elastic force of the second spring, and the cam rotates around the axial center line of the mandrel until contacting with the guide rail to realize rail holding self-locking.
Furthermore, an upper connecting hole and a lower connecting hole are formed in the swing arm of the cam, the lower end of the first screw is connected with the chain, the other end of the chain is connected to the upper connecting hole, and the upper end of the second spring is connected to the lower connecting hole;
when the lifting chain is broken or damaged, the lifting force acting on the first screw rod and the chain disappears, and the chain is compressed along with the falling of the first screw rod; when the chain is compressed to a gapless state, the chain is a rigid body; the first screw and the chain jointly transmit thrust to the swing arm.
To sum up, the anti-falling control method for the cargo carrying platform has the following advantages:
1. the cam type anti-falling mechanisms are symmetrically arranged along two sides of the guide rail, when the bearing piece is broken or accidentally damaged, the two groups of cams are stressed in a balanced manner and rotate to one side of the guide rail simultaneously under the common action of the plurality of groups of springs and the screw rods, so that the rail holding and falling stopping are directly triggered, the starting time interval of the anti-falling mechanisms is small, and the safety performance is higher.
2. The application provides a cam type prevents weighing down the mechanism comparatively simply, and multiunit spring is the same with rope belt fracture direction with being connected of screw, atress direction, and the anti-falling that had helped realizing quick interlock starts the effect, easily realizes the installation in advance debugging of a plurality of parts simultaneously, and the operation precision, all lower to operation personnel's technical skill requirement.
3. On the premise of ensuring the operation safety of the cargo carrying platform, the requirement of the anti-falling mechanism on the installation space is effectively reduced, and the operation cost of the safety equipment is remarkably reduced.
4. Through the structural optimization of the local connecting part, the instantaneity and the accuracy of the linkage of the anti-falling mechanism are correspondingly improved, so that the phenomenon of inclination or obvious vibration is effectively avoided, the phenomenon of falling of goods is prevented, and the protective effect which is obvious for field operation personnel and equipment is achieved.
Drawings
The invention will now be further described with reference to the following figures.
FIG. 1 is a schematic view of a cargo bed with a lifting screw attached;
FIG. 2 is a schematic view after mounting the guide posts;
FIG. 3 is a schematic view of a linkage arrangement;
FIG. 4 is a schematic view after the connecting rod is installed;
FIG. 5 is a schematic view after installation of the cam;
FIGS. 6-1 and 6-2 are schematic diagrams of the cam in the forward and side directions, respectively;
FIG. 7 is a schematic view of a cargo bed mounted fall arrest mechanism according to the present application;
FIG. 8 is a state diagram of the cargo bed when the fall arrest mechanism is not activated;
FIG. 9 is the inner and outer side structure diagram of the cargo carrying platform after the falling-preventing mechanism is started.
Detailed Description
Example 1, as shown in fig. 1 to 7, a cargo bed to which the anti-falling control method of the present application is applied has two sets of cargo bed side arms 1000 connected to the lifting chains 13, and a set of cam-type anti-falling mechanisms is respectively mounted on each set of cargo bed side arms 1000.
Specifically, 2 groups of oblong through grooves 1001 and 2 groups of bottom positioning plates 1002, 2 groups of mandrels 1003, and 2 groups of top positioning seats 1004 are disposed on the side arms 1000 of the cargo carrying platform. The positioning plate 1002 and the mandrel 1003 are located on the outer side of the cargo-carrying platform side arm 1000, and the upper end positioning seat 1004 is located on the inner side of the cargo-carrying platform side arm 1000.
The cam type anti-falling mechanism comprises a lifting screw 12 connected with a lifting chain 13, the lifting screw 12 penetrates through the top of a side arm 1000 of the cargo carrying platform, the upper end of the lifting screw 12 is connected with the lifting chain 13, and the lower end of the lifting screw 12 penetrates through a connecting rod 1;
a section of milling plane is arranged on the outer surface of the lifting screw 12, and the clamping plate 14 arranged on the side arm 1000 of the cargo carrying platform is propped against the milling plane of the lifting screw 12, so that the lifting screw 12 is limited to slide back and forth in the vertical direction and is prevented from rotating along the circumferential direction.
The connecting rod 1 is provided with 2 groups of end plates 1-1 with two sides extending outwards, a central round hole 1-3 and 2 groups of guide pillar through holes 1-2;
the lifting screw 12 passes through the central circular hole 1-3, the lifting screw 12 is locked below the connecting rod 1 through a nut, and the lifting screw 12 can vertically pass through the connecting rod 1 from top to bottom;
2 groups of guide pillars 11 are screwed on the side arm 1000 of the cargo carrying platform, and the lower ends of the guide pillars 11 penetrate through guide pillar through holes 1-2 and are locked by nuts; the nut locking the lifting screw 12 is vertically higher than the nut locking the guide post 11.
Two sections of planes which are symmetrically arranged are milled on the guide post 11, so that the guide post 11 can be clamped by a wrench for screwing operation during installation.
Two end plates 1-1 on two sides of the connecting rod 1 penetrate through the through groove 1001 from inside to outside, a detection block 8 is installed on the end plates 1-1, and correspondingly, a proximity switch 9 is installed on the side arm 1000 of the cargo carrying platform.
A group of first springs 10 are respectively connected to 2 groups of end plates 1-1 of the connecting rod 1, and the other ends of the first springs 10 are connected to upper end positioning seats 1004 on the side arms 1000 of the cargo carrying platform.
Connecting angle steel 2 is installed on an end plate 1-1 extending out of the through groove 1001 at the outer side of the side arm 1000 of the cargo carrying platform through bolts;
the cam 5 is provided with an eccentric hole 54 and a lateral swing arm 51, and an upper connecting hole 52 and a lower connecting hole 53 are arranged on the swing arm 51; the mandrel 1003 passes through the eccentric hole 54 and is locked by a circlip to prevent the mandrel 1003 from falling off, and the mounted cam 5 can rotate around the mandrel 1003 in a circumferential reciprocating manner; the cam 5 is provided with a knurled pattern to increase the roughness of the surface thereof and increase the friction force.
The upper end of the first screw rod 3 penetrates through the angle steel 2 and is vertically locked through a nut, the lower end of the first screw rod 3 is connected with a chain 4, and the other end of the chain 4 is connected to the upper connecting hole 52; the lower connecting hole 53 is connected with a second spring 6, and the other end of the second spring 6 is connected with a second screw 7; the second screw 7 penetrates through the bottom end positioning plate 1002 and is vertically locked by a nut.
The application provides the following anti-falling control method for the cargo carrying platform, which comprises the following steps:
the cargo carrying platform is lifted along the guide rail 20 under the traction of the lifting chain 13;
in the inner side of the side arm 1000 of the cargo carrying platform, the lifting force of the lifting chain 13 is transmitted to the connecting rod 1 through the lifting screw 12, the connecting rod 1 is lifted to the top end of the guide rod 11, the first spring 10 connected to the end plate 1-1 is stretched, and the detection block 8 is separated from the sensing range of the proximity switch 9;
at the outer side of the side arm 1000 of the loading platform, the connecting rod 1 pulls up the swing arm 51 and the 2 groups of cams 5 along the vertical direction through the first screw 3, and certain gaps (generally between 2 and 3 mm) are reserved between the connecting rod 1 and the guide rail 200 respectively;
when the lifting chain 13 is broken or damaged, the connecting rod 1 slides downwards along the guide post 11 under the combined action of the self gravity and the return elastic force of the first spring 10, so that the detection block 8 enters the sensing range of the proximity switch 9 to trigger an electric alarm;
under the drive of the connecting rod 1, the first screw 3 moves downwards and pushes the swing arm 51, meanwhile, the swing arm 51 swings under the action of the reset elastic force of the second spring 6, and the cam 5 axially rotates around the mandrel 1003 until contacting with the guide rail 200 to realize rail holding self-locking.
At the beginning of the goods loading platform falling, the friction force between the guide rail 200 and the cam 5 is upward, so 2 groups of cams 5 respectively rotate around anticlockwise and clockwise, the clearance between the cam 5 and the guide rail 200 is smaller and smaller, the forward pressure is larger and larger, the friction force between the cam 5 and the guide rail is larger and larger, the self-locking is finally realized, and the goods loading platform safely stops lifting.
Further, an upper connection hole 52 and a lower connection hole 53 are provided on the swing arm 51 of the cam 5, the lower end of the first screw 3 is connected with the chain 4, and the other end of the chain 4 is connected to the upper connection hole 52; the upper end of the second spring 6 is connected to the lower connection hole 53.
When the lifting chain 13 is broken or damaged, the lifting force acting on the first screw 3 and the chain 4 disappears, the swing arm 51 of the cam 5 swings under the combined action of the self-gravity and the return elastic force of the second spring 6, and the 2 groups of cams rotate around the axial center line of the mandrel 1003 simultaneously.
Wherein the chain 4 is compressed as the first screw 3 falls; when the chain 4 is compressed to a gapless state, it can be regarded as a rigid body, and the first screw 3 and the chain 4 together transmit the thrust to the swing arm 51.
The first screw 3 moves vertically downward during the falling process, and the swing arm 51 swings around the mandrel 1003, and the swinging motion of the swing arm 51 can be divided into a vertical motion and a horizontal motion. The chain 4 is used for flexible connection, so that the swing arm 51 is not influenced to swing when the first screw rod 3 moves vertically. Conversely, if the first screw 3 and the swing arm 51 are rigidly connected in any other form, the swing arm 51 has a small margin of horizontal movement along with the first screw 3 and does not have obvious horizontal vector displacement, so that the swing movement of the swing arm 51 is relatively limited, and the initial gap between the cam 5 and the guide rail 200 is small, otherwise, the anti-falling mechanism cannot realize self-locking.
In summary, the embodiments shown in the drawings are only preferred embodiments for achieving the design objectives of the present application, and other alternative structures directly derived by those skilled in the art should also fall within the protection scope of the present application.
Claims (2)
1. A cargo platform anti-falling control method is characterized in that: the cargo carrying platform is provided with two groups of cargo carrying platform side arms connected with the lifting chains, and a group of cam type anti-falling mechanisms are respectively arranged on each group of cargo carrying platform side arms;
2 groups of oblong through grooves are arranged on the side arms of the cargo carrying platform, and 2 groups of bottom end positioning plates, 2 groups of mandrels and 2 groups of upper end positioning seats are arranged on the side arms of the cargo carrying platform;
the cam type anti-falling mechanism comprises a lifting screw rod connected with a lifting chain, the lifting screw rod penetrates through the top of the side arm of the cargo carrying platform, the upper end of the lifting screw rod is connected with the lifting chain, and the lower end of the lifting screw rod penetrates through a connecting rod; a section of milling plane is arranged on the outer surface of the lifting screw, and a clamping plate arranged on a side arm of the cargo carrying platform is propped against the milling plane of the lifting screw;
the connecting rod is provided with 2 groups of end plates, central round holes and 2 groups of guide post through holes, wherein two sides of the end plates extend outwards; the lifting screw rod penetrates through the central circular hole, the lifting screw rod is locked below the connecting rod through a nut, and the lifting screw rod can vertically pass through the connecting rod from top to bottom;
2 groups of guide pillars are screwed on the side arm of the cargo carrying platform, and the lower ends of the guide pillars penetrate through guide pillar through holes and are locked by nuts; in the vertical direction, the nut for locking the lifting screw is higher than the nut for locking the guide pillar; two sections of planes which are symmetrically arranged are milled on the guide post;
end plates on two sides of the connecting rod penetrate through the through groove from inside to outside, a detection block is arranged on the end plates, and a proximity switch is arranged on a side arm of the cargo carrying platform;
a group of first springs are respectively connected to 2 groups of end plates of the connecting rod, and the other ends of the first springs are connected to upper end positioning seats on side arms of the cargo carrying platform;
connecting angle steel is installed on the outer side of the side arm of the cargo carrying platform through bolts, and the end plate extends out of the through groove;
the cam is provided with an eccentric hole and a lateral swing arm, and an upper connecting hole and a lower connecting hole are formed in the swing arm; the mandrel penetrates through the eccentric hole and is locked by adopting an elastic retainer ring, and the installed cam can rotate around the circumference of the mandrel in a reciprocating manner;
the upper end of the first screw penetrates through the angle steel and is vertically locked through the nut, the lower end of the first screw is connected with the chain, and the other end of the chain is connected to the upper connecting hole; the lower connecting hole is connected with a second spring, and the other end of the second spring is connected with a second screw rod; the second screw penetrates through the bottom positioning plate and is locked up and down by adopting a nut along the vertical direction;
in the process that the cargo carrying platform is dragged by the lifting chain to move up and down along the guide rail, the lifting force of the lifting chain is transmitted to the connecting rod through the lifting screw rod on the inner side of the side arm of the cargo carrying platform, the connecting rod is lifted to the top end of the guide pillar, the first spring connected to the end plate is stretched, and the detection block is separated from the sensing range of the proximity switch; on the outer side of the side arm of the cargo carrying platform, a connecting rod pulls up a swing arm through a first screw rod along the vertical direction, and 2 groups of cams respectively keep certain gaps with a guide rail;
when the lifting chain is broken or damaged, the connecting rod slides downwards along the guide post under the combined action of the self gravity and the return elastic force of the first spring, so that the detection block enters the induction range of the proximity switch to trigger an electric alarm;
under the drive of the connecting rod, the first screw rod moves downwards and pushes the swing arm, meanwhile, the swing arm swings under the action of the reset elastic force of the second spring, and the cam rotates around the axial center line of the mandrel until the cam is in contact with the guide rail to realize rail holding self-locking.
2. The cargo bed anti-falling control method according to claim 1, characterized in that: when the lifting chain is broken or damaged, the lifting force acting on the first screw rod and the chain disappears, and the chain is compressed along with the falling of the first screw rod; when the chain is compressed to a gapless state, the chain is a rigid body; the first screw and the chain jointly transmit thrust to the swing arm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110400253.8A CN113292006B (en) | 2021-04-14 | 2021-04-14 | Anti-falling control method for cargo platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110400253.8A CN113292006B (en) | 2021-04-14 | 2021-04-14 | Anti-falling control method for cargo platform |
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| Publication Number | Publication Date |
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| CN113292006A CN113292006A (en) | 2021-08-24 |
| CN113292006B true CN113292006B (en) | 2022-09-23 |
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| CN202110400253.8A Active CN113292006B (en) | 2021-04-14 | 2021-04-14 | Anti-falling control method for cargo platform |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4063138B2 (en) * | 2003-04-25 | 2008-03-19 | 株式会社ダイフク | Elevator drop prevention device |
| CN105293389A (en) * | 2015-11-24 | 2016-02-03 | 重庆红亿机械有限公司 | Car lifting jack with fall preventing function |
| CN109292686A (en) * | 2018-10-29 | 2019-02-01 | 太原市奥特莱物流科技有限公司 | A kind of anti-fall mechanism of light duty platform |
| CN212100475U (en) * | 2020-04-30 | 2020-12-08 | 山东洛杰斯特物流科技有限公司 | Loading platform of layer-changing elevator |
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