CN202625676U - Electric control system for slewing mechanism of tower crane - Google Patents

Electric control system for slewing mechanism of tower crane Download PDF

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Publication number
CN202625676U
CN202625676U CN 201220238069 CN201220238069U CN202625676U CN 202625676 U CN202625676 U CN 202625676U CN 201220238069 CN201220238069 CN 201220238069 CN 201220238069 U CN201220238069 U CN 201220238069U CN 202625676 U CN202625676 U CN 202625676U
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China
Prior art keywords
normally closed
changeing
closed switch
control
counter
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CN 201220238069
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Chinese (zh)
Inventor
刘剑荣
徐立成
陆仁范
张红旗
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Shanghai Shipyard Co Ltd
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Shanghai Shipyard Co Ltd
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Abstract

The utility model discloses an electric control system for a slewing mechanism of a tower crane. The electric control system comprises a forward limit normally closed switch, a reverse limit normally closed switch, a first intermediate relay, a second intermediate relay, a first intermediate relay normally open switch, a second intermediate relay normally open switch, a forward limit cam collision block which is used for changing the state of the forward limit normally closed switch, and a reverse limit cam collision block which is used for changing the state of the reverse limit normally closed switch. By arranging limit contacts and improving a control circuit and the cam collision block structure, an operator can judge the work position of the tower crane conveniently, the phenomenon that a cable is wound and broken is greatly reduced, and the reliability and the safety of the tower crane are effectively improved.

Description

Tower crane swing type mechanism electric control system
Technical field
The utility model relates to a kind of tower crane, particularly a kind of tower crane swing type mechanism electric control system.
Background technology
Along with the continuous development of industry, tower crane (tower crane) is because work speed is high, and efficient is high, and operating range is big; Mode of operation is many, and adaption object is wide, and is easy to use; Advantage such as easy to maintenance, thus use more and more wider, very extensive in shipbuilding and construction trade use particularly.Because the tower crane swing type mechanism can rotate freely any angle in 360 ° of scopes, alerting ability is stronger, so increased its operating range.The electric control box of tower crane generally is installed on the top rotation jib; But because shipbuilding flat-bed tower crane is than higher; The installation site is fixed basically; And tower crane uses and more frequently to cause electric-control system various indispositions to occur through regular meeting, considers that the service worker day-to-day operation is safeguarded, carries heavy service tools bag always during maintenance and climb to the top through vertical ladder, and is not only dangerous but also inconvenient; So generally electrical control cabinet is installed in the tower crane bottom, then power cable and control cable is laid to each corresponding site of cat head.Because the tower crane upper space is smaller, is not easy to install the cable slip-ring device, so power cable and control cable can only fixedly be laid the pivoting support place to the top along body of the tower, then through rotating jib directly to each corresponding site.Can only follow jib from the cable of pivoting support to each corresponding site when therefore working rotates together.Prior art such as Fig. 1, shown in Figure 2.
HZJ is the drg control contactor among Fig. 1, and HZC and HFC are respectively rotating mechanism and rotate and reverse control contactor, and HQF is an air switch, and HRC1, HRC2, HRC3 and HRC4 are the speed control contactless switch.HZT is a rotating mechanism brake gear coil among Fig. 1.Tower crane rotating mechanism brake gear is different with general hoisting crane brake gear mode, and promptly it adopts brake open in usual, when tower crane is not worked, and the brake coil outage, brake gear is in releasing orientation, and the rotation jib can rotate freely.Only need to install, during the location, handle rotor switch SA1 at hanging object, make the brake coil energising after, brake gear just will rotate jib and check.
HZK, HFK are two auxiliary contacts of slewing limiter among Fig. 2, are the limits of control tower crane rotating mechanism both direction operation.Use in order to satisfy routine; Require the positive and negative both direction of rotating mechanism all can move 1.5 circles (540 °) during design; Promptly under normal circumstances behind rotating mechanism positive dirction operation 1.5 circles (540 °); Contact HZK action, rotating mechanism can not continue can only to move in the opposite direction towards this direction operation; When in like manner rotating mechanism moves 1.5 circles (540 °) in the opposite direction, contact HFK action, rotating mechanism can only move towards positive dirction.
Owing to the protection of rotary caging device, cable can only be followed jib at most and twined towards a direction during normal operation, such as 1.5 circles (540 °).When attacked by strong wind,,, possibly cause whole body of the tower serious distortion distortion, even cause collapse accident in case meet with strong wind if it is locked to adopt brake gear to rotate jib.Take place for fear of this accident, when tower crane quits work, require to let jib be in free rotation state, promptly jib can be followed wind direction and rotated freely under the effect of wind-force.But this shape operation condition exists a kind of hidden danger, promptly after tower crane is out of service, because the effect of inertia slippage or wind-force makes jib towards a direction rotating operation.Because the slewing limiter inner cam can only be changeed 1 circle (360 °), original design cam dog effective collision stroke less (only have about 5mm, be equivalent to rotatable 10 °) makes to reset again easily after the micro-switch action.Operate under the ignorant situation of operative employee, thereby cause jib to move more, enclose (540 °) more such as having moved 1.5 towards this direction, even more circles.Yet because cable is to follow jib to rotate together, so cable also will twine 1.5 circles (540 °) towards this direction more, in addition more.If things go on like this, will cause cable to produce serious wrapping phenomena, and cause insulating barrier damaged, even phenomenon of rupture appear in cable.
The utility model content
The technical matters that the utility model will solve is that the prior art cable twines even the defective of fracture in order to overcome, and a kind of tower crane swing type mechanism electric control system is provided.
The utility model solves above-mentioned technical matters through following technical proposals: a kind of tower crane swing type mechanism electric control system comprises single-revolution mechanism major loop, single-revolution mechanism controls loop; The single-revolution limiting device, wherein, said swing type mechanism control loop comprises that one is just changeing spacing normally closed switch; The spacing normally closed switch of one counter-rotating, one is just changeing the control normally closed switch, a counter-rotating control normally closed switch; One is just changeing a control contactor and a counter-rotating control contactor, said slewing limiter comprise one be used to change said just changeing spacing normally closed switch state just change the counter-rotating limit cam collision block that limit cam collision block and is used to change the spacing normally closed switch state of said counter-rotating, it is characterized in that; Said swing type mechanism control loop comprises that also one is just changeing limit normally closed switch; One inversion limitation normally closed switch, one first intermediate relay, one second intermediate relay; One first intermediate relay normal open switch; One second intermediate relay normal open switch, wherein, said counter-rotating control normally closed switch, the said first intermediate relay normal open switch and said just changeing control contactor and is being connected in series and constitutes one and just changeing the control branch road; Said control normally closed switch, the said second intermediate relay normal open switch and the said counter-rotating control contactor of just changeing is connected in series and constitutes a counter-rotating control branch road; Saidly just changeing spacing normally closed switch, said limit normally closed switch and said first intermediate relay of just changeing is connected in series and constitutes one first intermediate relay branch road; The spacing normally closed switch of said counter-rotating, said inversion limitation normally closed switch and said second intermediate relay are connected in series and constitute one second intermediate relay branch road; Said control branch road, said counter-rotating control branch road, the said first intermediate relay branch road and the said second intermediate relay branch road of just changeing is connected in parallel, said slewing limiter also comprise one be used to change said just changeing limit normally closed switch state just change the inversion limitation cam dog that limit cam dog and is used to change said inversion limitation normally closed switch state.
Preferable; Said swing type mechanism control loop also comprises one first intermediate relay normally closed switch; One second intermediate relay normally closed switch; One is just changeing a limit warning light and an inversion limitation warning light, and wherein, the said first intermediate relay normally closed switch and said is just changeing limit warning light and is being connected in series and constitutes one and just changeing limit warning light branch road; Said second intermediate relay normally closed switch and said inversion limitation warning light are connected in series and constitute an inversion limitation warning light branch road, saidly just changeing control branch road, said counter-rotating control branch road, the said first intermediate relay branch road, the said second intermediate relay branch road, are saidly just changeing limit warning light branch road and said inversion limitation warning light branch road is connected in parallel.Like this, convenient operative employee's judgement.
Preferable, saidly just change control branch road, said counter-rotating control branch road, the said first intermediate relay branch road, the said second intermediate relay branch road, saidly just changeing limit warning light branch road and said inversion limitation warning light branch road directly is connected in parallel on two power leads.
Preferable, the said limit cam collision block, said counter-rotating limit cam collision block, said effective collision zone of just changeing limit cam dog and said inversion limitation cam dog of just changeing is sector structure.
A kind of tower crane swing type mechanism electric control system comprises single-revolution mechanism major loop, single-revolution mechanism controls loop; The single-revolution limiting device, wherein, said swing type mechanism control loop comprises that one is just changeing spacing normally closed switch; The spacing normally closed switch of one counter-rotating; One is just changeing the control normally closed switch, a counter-rotating control normally closed switch, and one is just changeing a control contactor and a counter-rotating control contactor; Said slewing limiter comprise one be used to change said just changeing spacing normally closed switch state just change the counter-rotating limit cam collision block that limit cam collision block and is used to change the spacing normally closed switch state of said counter-rotating; It is characterized in that said swing type mechanism control loop comprises that also one is just changeing limit normally closed switch, an inversion limitation normally closed switch; Wherein, said counter-rotating control normally closed switch, saidly just changeing spacing normally closed switch, the said limit normally closed switch and said of just changeing is just changeing control contactor and is connected in series and constitutes one and just changeing control loop; Said control normally closed switch, the spacing normally closed switch of said counter-rotating, said inversion limitation normally closed switch and the said counter-rotating control contactor of just changeing is connected in series and constitutes a counter-rotating control loop; Saidly just changeing control loop and said counter-rotating control loop is connected in parallel, said slewing limiter also comprise one be used to change said just changeing limit normally closed switch state just change the inversion limitation cam dog that limit cam dog and is used to change said inversion limitation normally closed switch state.
Preferable, saidly just changeing control loop and said counter-rotating control loop directly is connected in parallel on two power leads.
Preferable, the said limit cam collision block, said counter-rotating limit cam collision block, said effective collision zone of just changeing limit cam dog and said inversion limitation cam dog of just changeing is sector structure.
In the utility model, but above-mentioned optimum condition combination in any on the basis that meets this area general knowledge promptly gets each preferred embodiment of the utility model.
The positive progressive effect of the utility model is: just changeing the limit and inversion limitation contact through increasing; Corresponding improvement control circuit of while and cam dog structure; Significantly reduce the phenomenon that cable twines even ruptures, promoted tower crane reliability and safety effectively.
Description of drawings
Fig. 1 is the swing type mechanism major loop figure of prior art.
Fig. 2 is the swing type mechanism control loop figure of prior art.
Fig. 3 is the cam dog constructional drawing of prior art.
Fig. 4 is the swing type mechanism control loop figure of the utility model embodiment 1.
Fig. 5 is the swing type mechanism control loop figure of the utility model embodiment 2.
Fig. 6 is the cam dog constructional drawing of the utility model embodiment 1 and 2.
The specific embodiment
Provide the utility model preferred embodiment below in conjunction with accompanying drawing, to specify the technical scheme of the utility model.
Embodiment 1
At first, adopt duplicate protection.Slewing limiter is increased to the control of fourth officer contact by original two auxiliary contacts control; Such as: originally jib can only be worked in each 1.5 circle (540 °) scope of both forward and reverse directions; Existing through after increasing by two auxiliary contacts; Be set to jib and when positive and negative respectively 1.5 circles (540 °) and 2.5 circles (900 °), carry out folk prescription to the rotation protection, promptly each direction all is provided with spacing and the protection of limit position.When rotation jib positive and negative direction operation,, make each direction by the control that is together in series of two auxiliary contacts through the cam dog of suitable adjusting slewing limiter.As shown in Figure 4, by counter-rotating control normally closed switch HFC, the first intermediate relay normal open switch KA1 with just changeing control contactor HZC and be connected in series and constitute one and just changeing the control branch road; Be connected in series and constitute a counter-rotating control branch road by just changeing control normally closed switch HZC, the second intermediate relay normal open switch KA2 and counter-rotating control contactor HFC; HRC1, HRC2, HRC3, HRC4 are the speed control contactless switch; By just changeing spacing normally closed switch HZK1, just changeing the limit normally closed switch HZK2 and the first intermediate relay KA1 and be connected in series and constitute one first intermediate relay branch road; Be connected in series by counter-rotating spacing normally closed switch HFK1, the inversion limitation normally closed switch HFK2 and the second intermediate relay KA2 and constitute one second intermediate relay branch road; By the first intermediate relay normally closed switch KA1 with just changeing limit warning light H1 and be connected in series and constitute one and just changeing limit warning light branch road; Be connected in series by the second intermediate relay normally closed switch KA2 and inversion limitation warning light H2 and constitute an inversion limitation warning light branch road.Wherein, indicator lamp H1, H2 are installed in the body of the tower conspicuous position, so that let the operative employee can know the residing end position of swing type mechanism more clearly.
When jib was in forward or backwards end position, KA1 or KA2 got electric, make that H1 or H2 indicator lamp are bright, reminded the workman, and making is simultaneously just changeing control contactor HZC or counter-rotating control contactor HFC outage, and jib can not surpass this direction operation.Just in case jib is stopping near former spacing place; Because of coast and the anglec of rotation are bigger, reset again after making the spacing action of the former limit, then continue rotation 1 circle (360 °) in the direction after; Jib will be run into limit position and protect once more, thereby improve its protective effect greatly.
Then, the transmitting ratio of appropriate change slewing limiter.Slewing limiter is made up of switch that has speed reduction gearing and miniature gears, and limiting device is fixed on the pivoting support of tower crane, and the big gear wheel of miniature gears and pivoting support is meshing.Pass through the pinion rotation that big gear wheel drives limiting device during the rotation of tower crane jib; The collision block that the limiting device speed reduction gearing drives on cam and the cam rotates; When jib rotated to predefined end position, cam dog was depressed micro-switch, thereby made jib stop the rotation.Because the transmitting ratio of miniature gears and big gear wheel is changeless, if the choosing of slewing limiter transmitting ratio is too small, when jib rotated so, the stroke of limiting device inner cam dress piece was just bigger, and just the anglec of rotation is bigger; If slewing limiter transmitting ratio choosing is excessive, during the jib rotation, the stroke of limiting device inner cam collision block is very little again, and promptly the anglec of rotation is very little, and this all is not easy to installation and debugging.For example; The transmitting ratio of big gear wheel and miniature gears is 1: 10, and the diameter of cam dog is 30mm, if the transmitting ratio of slewing limiter is 1: 60; Work as jib so and revolve turn around (360 °); Be that big gear wheel is revolved when turning around (360 °), slewing limiter in-to-in cam dog only rotates 1/6 circle (60 °), and the rotating distance of cam dog is about about 15mm (being equivalent to rotate 60 °); If the transmitting ratio of slewing limiter is 1: 120, jib revolves turn around (360 °) so, and the rotating distance of cam dog is about 7mm (being equivalent to rotate 30 °).Here, we got 1: 100, and like this when jib rotation equal angular, the rotating distance of the slewing limiter inner cam collision block original rotating distance that just compares is little.
At last, improvement cam dog structure.Through customization; The effective collision stroke of slewing limiter inner cam collision block and contact cam is increased; Change into " fan-shaped " structure by original " dot type "; Being about to original effective travel is the collision block (as shown in Figure 3) about 5mm, and all changing to effective travel is the collision block (as shown in Figure 6) of 20mm.Even jib is when being in the end position of some directions like this; When meet with that strong wind makes jib continue to revolve towards this end position to turn around (360 °) in addition a circle half (540 °) after; Cam dog is still pushed down micro-switch; Energising back operative employee just can not be towards this direction operation, and can only the opposite spin jib.Here, 20mm is a preferred values, and those skilled in the art can change parameter according to actual conditions.
Embodiment 2
As shown in Figure 5; Comparing the different of present embodiment with embodiment 1 is; In the present embodiment, by counter-rotating control normally closed switch HFC, just change spacing normally closed switch HZK1, just change limit normally closed switch HZK2 and just changeing control contactor HZC and be connected in series and constitute and just changeing control loop; Be connected in series and constitute a counter-rotating control loop by just changeing control normally closed switch HZC, the spacing normally closed switch HFK1 of counter-rotating, inversion limitation normally closed switch HFK2 and counter-rotating control contactor HFC.Other parts are consistent with embodiment 1.Present embodiment 2 has been simplified partial circuit under the situation that does not influence radical function, easier.
Though more than described the specific embodiment of the utility model, it will be understood by those of skill in the art that these only are casehistorys, the protection domain of the utility model is limited appended claims.Those skilled in the art can make numerous variations or modification to these embodiments under the prerequisite of principle that does not deviate from the utility model and essence, but these changes and modification all fall into the protection domain of the utility model.

Claims (7)

1. a tower crane swing type mechanism electric control system comprises single-revolution mechanism major loop, single-revolution mechanism controls loop; The single-revolution limiting device, wherein, said swing type mechanism control loop comprises that one is just changeing spacing normally closed switch; The spacing normally closed switch of one counter-rotating, one is just changeing the control normally closed switch, a counter-rotating control normally closed switch; One is just changeing a control contactor and a counter-rotating control contactor, said slewing limiter comprise one be used to change said just changeing spacing normally closed switch state just change the counter-rotating limit cam collision block that limit cam collision block and is used to change the spacing normally closed switch state of said counter-rotating, it is characterized in that; Said swing type mechanism control loop comprises that also one is just changeing limit normally closed switch, an inversion limitation normally closed switch, one first intermediate relay; One second intermediate relay, one first intermediate relay normal open switch, one second intermediate relay normal open switch; Wherein
Said counter-rotating control normally closed switch, the said first intermediate relay normal open switch and said just changeing control contactor and is being connected in series and constitutes one and just changeing the control branch road;
Said control normally closed switch, the said second intermediate relay normal open switch and the said counter-rotating control contactor of just changeing is connected in series and constitutes a counter-rotating control branch road;
Saidly just changeing spacing normally closed switch, said limit normally closed switch and said first intermediate relay of just changeing is connected in series and constitutes one first intermediate relay branch road;
The spacing normally closed switch of said counter-rotating, said inversion limitation normally closed switch and said second intermediate relay are connected in series and constitute one second intermediate relay branch road,
Said control branch road, said counter-rotating control branch road, the said first intermediate relay branch road and the said second intermediate relay branch road of just changeing is connected in parallel, said slewing limiter also comprise one be used to change said just changeing limit normally closed switch state just change the inversion limitation cam dog that limit cam dog and is used to change said inversion limitation normally closed switch state.
2. tower crane swing type mechanism electric control system as claimed in claim 1 is characterized in that said swing type mechanism control loop also comprises one first intermediate relay normally closed switch; One second intermediate relay normally closed switch; One is just changeing a limit warning light and an inversion limitation warning light, wherein
The said first intermediate relay normally closed switch and said is just changeing limit warning light and is being connected in series and constitutes one and just changeing limit warning light branch road;
Said second intermediate relay normally closed switch and said inversion limitation warning light are connected in series and constitute an inversion limitation warning light branch road,
Saidly just change control branch road, said counter-rotating control branch road, the said first intermediate relay branch road, the said second intermediate relay branch road, saidly just changeing limit warning light branch road and said inversion limitation warning light branch road is connected in parallel.
3. tower crane swing type mechanism electric control system as claimed in claim 2; It is characterized in that, saidly just changeing control branch road, said counter-rotating control branch road, the said first intermediate relay branch road, the said second intermediate relay branch road, saidly just changeing limit warning light branch road and said inversion limitation warning light branch road directly is connected in parallel on two power leads.
4. like any described tower crane swing type mechanism electric control system of claim 1-3; It is characterized in that, saidly just changeing limit cam collision block, said counter-rotating limit cam collision block, said effective collision zone of just changeing limit cam dog and said inversion limitation cam dog is sector structure.
5. a tower crane swing type mechanism electric control system comprises single-revolution mechanism major loop, single-revolution mechanism controls loop; The single-revolution limiting device, wherein, said swing type mechanism control loop comprises that one is just changeing spacing normally closed switch; The spacing normally closed switch of one counter-rotating, one is just changeing the control normally closed switch, a counter-rotating control normally closed switch; One is just changeing a control contactor and a counter-rotating control contactor, said slewing limiter comprise one be used to change said just changeing spacing normally closed switch state just change the counter-rotating limit cam collision block that limit cam collision block and is used to change the spacing normally closed switch state of said counter-rotating, it is characterized in that; Said swing type mechanism control loop comprises that also one is just changeing limit normally closed switch; One inversion limitation normally closed switch, wherein
Said counter-rotating control normally closed switch, saidly just changeing spacing normally closed switch, the said limit normally closed switch and said of just changeing is just changeing control contactor and is connected in series and constitutes one and just changeing control loop;
Said control normally closed switch, the spacing normally closed switch of said counter-rotating, said inversion limitation normally closed switch and the said counter-rotating control contactor of just changeing is connected in series and constitutes a counter-rotating control loop,
Saidly just changeing control loop and said counter-rotating control loop is connected in parallel, said slewing limiter also comprise one be used to change said just changeing limit normally closed switch state just change the inversion limitation cam dog that limit cam dog and is used to change said inversion limitation normally closed switch state.
6. tower crane swing type mechanism electric control system as claimed in claim 5 is characterized in that, is saidly just changeing control loop and said counter-rotating control loop directly is connected in parallel on two power leads.
7. like claim 5 or 6 described tower crane swing type mechanism electric control systems; It is characterized in that, saidly just changeing limit cam collision block, said counter-rotating limit cam collision block, said effective collision zone of just changeing limit cam dog and said inversion limitation cam dog is sector structure.
CN 201220238069 2012-05-23 2012-05-23 Electric control system for slewing mechanism of tower crane Active CN202625676U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220238069 CN202625676U (en) 2012-05-23 2012-05-23 Electric control system for slewing mechanism of tower crane

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Application Number Priority Date Filing Date Title
CN 201220238069 CN202625676U (en) 2012-05-23 2012-05-23 Electric control system for slewing mechanism of tower crane

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103991805A (en) * 2014-06-06 2014-08-20 南通市达欣工程股份有限公司 Electrical emergency control circuit for tower crane

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103991805A (en) * 2014-06-06 2014-08-20 南通市达欣工程股份有限公司 Electrical emergency control circuit for tower crane

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