CN103723633B - Crane as well as free hook falling control equipment, system and method thereof - Google Patents

Crane as well as free hook falling control equipment, system and method thereof Download PDF

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Publication number
CN103723633B
CN103723633B CN201310685199.1A CN201310685199A CN103723633B CN 103723633 B CN103723633 B CN 103723633B CN 201310685199 A CN201310685199 A CN 201310685199A CN 103723633 B CN103723633 B CN 103723633B
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weight
free
hook
instruction
maximum permissible
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CN103723633A (en
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彭刚毅
吕舷
张世军
汤小君
廖凯
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Zoomlion Heavy Industry Science and Technology Co Ltd
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Zoomlion Heavy Industry Science and Technology Co Ltd
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Abstract

The invention discloses a crane as well as free hook falling control equipment, a free hook falling control system and a free hook falling control method thereof. The method comprises the following steps: receiving the current weight of a lifting object and an instruction of switching on a free hook falling switch, and calculating to obtain the current lifting weight via the current weight of the lifting object, and controlling a free hook falling control valve group to enable a winch to be separated from a clutch according to the instruction of switching on the free hook falling switch under the condition that the current lifting weight is less than the maximum allowable weight, wherein the maximum allowable weight is obtained by calculating via the rotational inertia of a winding drum, the multiplying power of a steel wire rope, a rated load lifting capacity, a load rate, braking torque, and the radius of a layer where the steel wire rope is located during free hook falling. According to the invention, whether to allow the operation of free hook falling is determined via a comparison result between the current lifting weight and the maximum allowable weight, and an operator is not required to perform human judgment, so that a safety accident, caused by inaccuracy in weight judgment or misoperation by the operator is effectively avoided.

Description

A kind of hoisting crane and free off the hook control convenience, system and method
Technical field
The present invention relates to free off the hook control technology, particularly, relate to a kind of hoisting crane and free off the hook control convenience, system and method.
Background technology
When the suspension hook of hoisting crane is suspended in aerial, if lift heavy is in allowed band, so suspension hook promptly can be dropped on ground by free off the hook operation, can greatly save the lifting time like this.But, when carrying out free off the hook operation, if lift heavy has exceeded the permitted maximum range, then probably there is the serious accidents such as hoisting mechanism damages, jib ruptures, crane topples.
But current free off the hook operation relies on artificially judge to operate completely, so probably because operating personal to judge the consequence of the reasons such as inaccurate or maloperation and bringing on a disaster property to weight.
Summary of the invention
The object of this invention is to provide a kind of hoisting crane and free off the hook control convenience, system and method, for solving the problem of the free off the hook operation of volitional check.
To achieve these goals, the invention provides a kind of free off the hook control convenience, this equipment comprises: receptor, currently hangs thing weight and the instruction of free off the hook switch opens for receiving; And controller, current lift heavy is obtained according to the described current thing Weight computation that hangs, and when described current lift heavy is less than Maximum Permissible Weight, according to the instruction of described free off the hook switch opens, controlling free off the hook control cock group makes winch and power-transfer clutch depart from, wherein, described Maximum Permissible Weight obtains according to the radius calculation of steel rope place layer when spool turns inertia, steel rope multiplying power, rated load weight, load factor, lock torque, free off the hook.
Correspondingly, present invention also offers a kind of free off the hook control system, this system comprises: above-mentioned free off the hook control convenience; And detecting device, currently hang thing weight for detecting.
Correspondingly, present invention also offers a kind of hoisting crane, comprise above-mentioned free off the hook control system.
Correspondingly, present invention also offers a kind of free off the hook control method, it is characterized in that, the method comprises: receive current lift heavy and the instruction of free off the hook switch opens; And obtain current lift heavy according to the described current thing Weight computation that hangs, and when described current lift heavy is less than Maximum Permissible Weight, according to the instruction of described free off the hook switch opens, controlling free off the hook control cock group makes winch and power-transfer clutch depart from, wherein, described Maximum Permissible Weight obtains according to the radius calculation of steel rope place layer when spool turns inertia, steel rope multiplying power, rated load weight, load factor, lock torque, free off the hook.
Pass through technique scheme, the present invention is by determining whether to allow free off the hook to operate according to the comparative result of current lift heavy and Maximum Permissible Weight, artificially judge without the need to operating personal, efficiently avoid operating personal and the safety misadventure that inaccurate or maloperation causes is judged to weight.
Other features and advantages of the present invention are described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification sheets, is used from explanation the present invention, but is not construed as limiting the invention with detailed description of the invention one below.In the accompanying drawings:
Fig. 1 is the block diagram of free off the hook control convenience provided by the invention;
Fig. 2 is the block diagram of free off the hook control system provided by the invention; And
Fig. 3 is the diagram of circuit of free off the hook control method provided by the invention.
Description of reference numerals
10 free off the hook control convenience 20 detecting devices
101 receptor 102 controllers
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
Fig. 1 is the block diagram of free off the hook control convenience 10 provided by the invention, and as shown in Figure 1, this equipment 10 comprises receptor 101 and controller 102.Receptor 101 currently hangs thing weight and the instruction of free off the hook switch opens for receiving, controller 102 obtains current lift heavy according to the described current thing Weight computation that hangs, and when current lift heavy is less than Maximum Permissible Weight, according to the instruction of free off the hook switch opens, controlling free off the hook control cock group makes winch and power-transfer clutch depart from, wherein, Maximum Permissible Weight obtains according to the radius calculation of steel rope place layer when spool turns inertia, steel rope multiplying power, rated load weight, load factor, lock torque, free off the hook.
In free off the hook process, need to brake weight before weight arrives ground, cause safety misadventure to avoid weight to arrive ground with very large speed.So needed to implement braking force by steel rope to weight before weight arrives ground, in order to ensure that in braking procedure steel rope does not rupture, lift heavy can not exceed Maximum Permissible Weight.Below the computation process of Maximum Permissible Weight is set forth.
Be research object with reel, by dynamics analysis, following formula can be set up:
M Z - T 1 · r J = n · a 1 r - - - ( 1 )
Wherein, T 1for steel rope list rope tension in braking procedure, the radius of steel rope place layer when r is free off the hook, J is the rotor inertia of reel, steel rope multiplying power when n is lift heavy, a 1for the braking acceleration of weight in braking procedure, M zfor lock torque, unit is Nm, M zcan following formulae discovery be passed through:
M Z＝(F 1-F 2)·R (2)
Wherein, F 1for brake collar tight side tension, F 2for brake collar slack list pulling force, R is brake drum diameter, F 1with F 2there is following relation:
F 1＝F 2·e μβ(3)
Wherein, μ is friction coefficient, and β is brake collar cornerite size (radian).
Formula (3) is substituted in formula (2), can obtain
M Z＝(F 2·e μβ-F 2)·R＝F 2(e μβ-1)·R (4)
Take weight as research object, following formula can be set up:
T 1 = 1 n · m · ( g + a 1 ) - - - ( 5 )
Wherein, a 1for the braking acceleration of weight in braking procedure, g is acceleration due to gravity, and m is current lift heavy.
Formula (5) is substituted in formula (1), can obtain:
M z - 1 n · m · ( g + a 1 ) · r = J · n r · a 1 - - - ( 6 )
Thus, a can be derived 1computing formula as follows:
a 1 = M z - mg r n J · n r + m · r n - - - ( 7 )
In order to ensure that in braking procedure steel rope does not rupture, demand fulfillment:
T 1·n<q (8)
Wherein, q=rated load weight × load factor.
Simultaneous formula (5), formula (7) and formula (8), and carry out abbreviation, can obtain:
m < Jn 2 q M z nr + Jn 2 g - qr 2 - - - ( 9 )
That is, Maximum Permissible Weight m' is
Wherein, described current lift heavy is suspension hook weight, currently hangs thing weight and steel rope weight sum.Operation performed by controller 102 can be implemented by limiter of moment and PLC (programmable logic controller (PLC)), limiter of moment is used for hanging that thing Weight computation is current hangs thing weight, suspension hook weight and steel rope weight sum, to obtain current lift heavy according to current.When current lift heavy is less than Maximum Permissible Weight, limiter of moment sends to PLC and allows free off the hook instruction.In operator's compartment, be provided with free off the hook switch, when needs carry out free off the hook operation, chaufeur can open this free off the hook switch, thus receptor 101 can receive the instruction of free off the hook switch opens.When PLC receives the free off the hook instruction of permission and receptor 101 receives free off the hook switch opens instruction, PLC exports control signal, controls free off the hook control cock group and winch and power-transfer clutch are departed from.Wherein, also can implement in PLC the contrast operation of current lift heavy and Maximum Permissible Weight.
In addition, be also provided with free off the hook stretcher in operator's compartment, when winch and power-transfer clutch depart from, if chaufeur steps on free off the hook stretcher, then elevator external contractring brake is opened, and performs free off the hook operation.
Fig. 2 is the block diagram of free off the hook control system provided by the invention, and as shown in Figure 2, this system not only comprises free off the hook control convenience 10, also comprises detecting device 20.Detecting device 20 currently hangs thing weight for detecting.
Correspondingly, present invention also offers a kind of hoisting crane, comprise above-mentioned free off the hook control system.
Fig. 3 is the diagram of circuit of free off the hook control method provided by the invention, as shown in Figure 3, comprise the following steps: receive and currently hang thing weight and the instruction of free off the hook switch opens, current lift heavy is obtained according to the described current thing Weight computation that hangs, and when described current lift heavy is less than Maximum Permissible Weight, according to the instruction of described free off the hook switch opens, controlling free off the hook control cock group makes winch and power-transfer clutch depart from, wherein, described Maximum Permissible Weight is according to spool turns inertia, steel rope multiplying power, rated load weight, load factor, lock torque, during free off the hook, the radius calculation of steel rope place layer obtains.
Specifically, first receive and currently hang thing weight, then calculate and currently hang thing weight, suspension hook weight and Quality of Steel Wire Rope sum, obtain current lift heavy.Then judge whether current lift heavy < Maximum Permissible Weight, if current lift heavy < Maximum Permissible Weight, then continue to judge whether to receive the instruction of free off the hook switch opens, otherwise do not perform any operation.When current lift heavy < Maximum Permissible Weight, if receive the instruction of free off the hook switch opens, then open free off the hook control cock group, winch and power-transfer clutch are departed from, otherwise, do not perform any operation.
It should be noted that, about the detail of free off the hook control method provided by the invention and benefit corresponding with free off the hook control convenience provided by the invention, in this, it will not go into details.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings, but, the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention, multiple simple variant can be carried out to technical scheme of the present invention, such as, PLC is changed to other electronic controllers, or, the different free off the hook control cock group controlling free off the hook by different way may be adopted for different hoisting cranes.These simple variant all belong to protection scope of the present invention.
By technical scheme provided by the invention, hang thing weight volitional check free off the hook operation according to current, can effectively avoid because people is misjudgment and the safety misadventure that causes.
It should be noted that in addition, each the concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out combination in any between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.

Claims (10)

1. a free off the hook control convenience, is characterized in that, this equipment comprises:
Receptor, currently hangs thing weight and the instruction of free off the hook switch opens for receiving; And
Controller, obtains current lift heavy according to the described current thing Weight computation that hangs, and when described current lift heavy is less than Maximum Permissible Weight, according to the instruction of described free off the hook switch opens, controls free off the hook control cock group and winch and power-transfer clutch are departed from,
Wherein, described Maximum Permissible Weight obtains according to the radius calculation of steel rope place layer when spool turns inertia, steel rope multiplying power, rated load weight, load factor, lock torque, free off the hook.
2. equipment according to claim 1, is characterized in that, the computing formula of described Maximum Permissible Weight is as follows:
m &prime; = J n 2 q M z nr + J n 2 g - q r 2 ;
Wherein, m' is described Maximum Permissible Weight, and J is spool turns inertia, and n is steel rope multiplying power, q=rated load weight × load factor, M zfor lock torque, the radius of steel rope place layer when r is free off the hook, g is acceleration due to gravity.
3. equipment according to claim 1, is characterized in that, described current lift heavy is suspension hook weight, currently hangs thing weight and steel rope weight sum.
4. equipment according to claim 1, is characterized in that, described controller comprises:
Limiter of moment, obtains current lift heavy according to the described current thing Weight computation that hangs, and when described current lift heavy is less than Maximum Permissible Weight, sends and allow free off the hook instruction; And
Programmable logic controller (PLC), for according to described permission free off the hook instruction and the instruction of described free off the hook switch opens, controls free off the hook control cock group and winch and power-transfer clutch is departed from.
5. a free off the hook control system, is characterized in that, this system comprises:
Equipment any one of Claims 1-4 described in claim; And
Detecting device, currently hangs thing weight for detecting.
6. a hoisting crane, is characterized in that, comprises system according to claim 5.
7. a free off the hook control method, it is characterized in that, the method comprises:
Receive and currently hang thing weight and the instruction of free off the hook switch opens; And
Obtain current lift heavy according to the described current thing Weight computation that hangs, and when described current lift heavy is less than Maximum Permissible Weight, according to the instruction of described free off the hook switch opens, controls free off the hook control cock group and winch and power-transfer clutch are departed from,
Wherein, described Maximum Permissible Weight obtains according to the radius calculation of steel rope place layer when spool turns inertia, steel rope multiplying power, rated load weight, load factor, lock torque, free off the hook.
8. method according to claim 7, is characterized in that, the computing formula of described Maximum Permissible Weight is as follows:
m &prime; = J n 2 q M z nr + J n 2 g - q r 2 ;
Wherein, m' is described Maximum Permissible Weight, and J is spool turns inertia, and n is steel rope multiplying power, q=rated load weight × load factor, M zfor lock torque, the radius of steel rope place layer when r is free off the hook, g is acceleration due to gravity.
9. method according to claim 7, is characterized in that, described current lift heavy is suspension hook weight, currently hangs thing weight and steel rope weight sum.
10. method according to claim 7, is characterized in that, when described current lift heavy is less than Maximum Permissible Weight, according to the instruction of described free off the hook switch opens, controls free off the hook control cock group and winch and power-transfer clutch are departed from, comprising:
Obtain current lift heavy according to the described current thing Weight computation that hangs, and when described current lift heavy is less than Maximum Permissible Weight, sends and allow free off the hook instruction; And
According to described permission free off the hook instruction and the instruction of described free off the hook switch opens, control free off the hook control cock group and winch and power-transfer clutch are departed from.
CN201310685199.1A 2013-12-13 2013-12-13 Crane as well as free hook falling control equipment, system and method thereof Active CN103723633B (en)

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Publication number Priority date Publication date Assignee Title
CN107840249B (en) * 2017-12-01 2019-06-07 浙江三一装备有限公司 A kind of free off the hook hydraulic system of crane and crane

Citations (4)

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Publication number Priority date Publication date Assignee Title
US6598859B1 (en) * 2001-05-31 2003-07-29 Magnetek, Inc. Multiple hoist synchronization apparatus and method
CN202744252U (en) * 2012-07-18 2013-02-20 郑州宇通重工有限公司 Automatic steel wire rope detaching prevention control device of winch with free hook dropping
CN202785334U (en) * 2012-09-25 2013-03-13 辽宁抚挖重工机械股份有限公司 Hook free-fall hydraulic control system of crawling crane
CN202953731U (en) * 2012-12-20 2013-05-29 中联重科股份有限公司 Free hook dropping operation switching circuit and device as well as crane

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3490549B2 (en) * 1995-08-10 2004-01-26 石川島建機株式会社 Hook overwind prevention device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6598859B1 (en) * 2001-05-31 2003-07-29 Magnetek, Inc. Multiple hoist synchronization apparatus and method
CN202744252U (en) * 2012-07-18 2013-02-20 郑州宇通重工有限公司 Automatic steel wire rope detaching prevention control device of winch with free hook dropping
CN202785334U (en) * 2012-09-25 2013-03-13 辽宁抚挖重工机械股份有限公司 Hook free-fall hydraulic control system of crawling crane
CN202953731U (en) * 2012-12-20 2013-05-29 中联重科股份有限公司 Free hook dropping operation switching circuit and device as well as crane

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