CN1031252C - Moment limiter - Google Patents
Moment limiter Download PDFInfo
- Publication number
- CN1031252C CN1031252C CN 93115158 CN93115158A CN1031252C CN 1031252 C CN1031252 C CN 1031252C CN 93115158 CN93115158 CN 93115158 CN 93115158 A CN93115158 A CN 93115158A CN 1031252 C CN1031252 C CN 1031252C
- Authority
- CN
- China
- Prior art keywords
- rotating shaft
- sliding block
- transverse slider
- longitudinal sliding
- shell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Jib Cranes (AREA)
Abstract
The present invention relates to a lifting moment limiter used for a tower type crane with a movable boom and variable amplitude. In order to overcome the defects of complicated adjustment and poor versatility in the application of the patent of NO. 90210865.4, the present invention is provided with a casing, a transversal slide block, a guide rail of the transversal slide block, a longitudinal slide block, and the guide rail of the longitudinal slide block, wherein a rocker is hinged on the casing; a rotary shaft is arranged on a rotary disk provided with a circular groove which is matched with a bulge on the transversal slide block; the other bulge on the transversal slide block is matched with an axial long groove on the rocker which is provided with an axial metal sheet; the transversal slide block is provided with a switching frame which is provided with a contact. The present invention is suitable for the tower type crane with a movable boom and variable amplitude and has strong reliability.
Description
The present invention relates to a kind of load moment limiter that is used for luffing jib tower crane.
At present, being widely used in the limiter of moment of luffing jib tower crane, mainly is the electronic type limiter of moment, though its system synthesis precision is higher, and poor reliability, the fault rate height is difficult to guarantee the safe in utilization of hoisting crane.
October 10 nineteen ninety, announced one on the utility model patent communique and be called the patent application of " weight, moment, amplitude limiter ", application number is 90210865.4.This killer is mainly used in trolley-jib tower crane, and its insulation curve ruler is that the lifting performance curve simulation with hoisting crane becomes function unit to realize the force moment protection that overloads.The insulation curve ruler is the fitfull curvilinear figure, and the shape of curve is relevant with the model of hoisting crane, and different trolley-jib tower cranes will lack the system property used with different insulation curve rulers.This insulation curve ruler must carry out loaded down with trivial details debugging correction at specific weight sensor (being " weight transmitter " in No. 90210865.4 patent applications) during fabrication, and production efficiency is very low.Revise good after, must with the supporting in couples use of this weight sensor, the operating needs strictness, the system synthesis precision is low.
The purpose of this invention is to provide that a kind of good reliability, debugging are simple, system synthesis precision height, be applicable to the limiter of moment of various luffing jib tower cranes.
Technical solution of the present invention is, the luffing jib tower crane limiter of moment, it has shell 5, transverse slider 20, be fixed on transverse slider guide rail 15, longitudinal sliding block 19 on the shell 5, be fixed on longitudinal sliding block guide rail 8, spring 7 and flexible axle 16 on the shell 5.Transverse slider guide rail 15 is vertical with longitudinal sliding block guide rail 8.One end of spring 7 is fixed on the shell 5, and the other end of spring 7 is fixed on the longitudinal sliding block 19.One end of flexible axle 16 is fixed on the longitudinal sliding block 19.Its special character is that an end of rocking bar 3 is installed on the shell 5 by hinge 4, and rocking bar 3 has an axial elongated slot 26, and elongated slot 26 cooperates with protrusion on the transverse slider 20.Rocking bar 3 is an insulator, has axial sheetmetal 1 on the rocking bar 3, sheetmetal 1 and shell 5 insulation.Length-adjustable switch frame 9 is installed on the longitudinal sliding block 19, contact 24 is installed on the switch frame 9.On shell 5, rotating shaft 28 is vertical with transverse slider guide rail 15 by bearing installation in rotating shaft 28, fixes a rotating disk 17 in the rotating shaft 28.Have a shape circular groove 18 on the rotating disk 17, circular trough 18 intersects vertically with rotating shaft 28, circular trough 18 cooperates with protrusion 27 on the transverse slider 20, rotating shaft 28 is connected with rotating shaft 31 by gear, rotating shaft 31 is fixed on the crane arm 29, the dead in line of the hinge axis 30 on the axis of rotating shaft 31 and the hoisting crane body of the tower 33.
The present invention is owing to without the shaped form control element, and is simple in structure, do not need debugging correction before dispatching from the factory, and manufacturing process simplifies greatly, has improved production efficiency, has reduced manufacturing cost.Its parts have interchangeability, can realize the operation of normalisation flowing water in the production process.The present invention has commonality widely, is applicable to the luffing jib tower crane of various models, and it does not need and the supporting use of specific weight sensor, and weight sensor can be changed use.During use, only need to debug at amplitude peak point and flex point (the limiting amplitude point the during biggest lifting capacity) two point locations, middle each point moves in strict accordance with mathematical law, its system synthesis precision＜± 3%.In addition, the relative electronic type limiter of moment of the present invention has good reliability, advantage that fault rate is low, and its Q-percentile life is not less than 5 * 10 service life greater than 6000h
5The secondary stress circulation.
Embodiments of the present invention is described in detail below in conjunction with accompanying drawing.
Fig. 1 is a front view of the present invention.
Fig. 2 is the A-A line cutaway view among Fig. 1
Fig. 3 is that B among Fig. 2 is to view.
Fig. 4 is a use erection plan of the present invention.
Fig. 5 is a fundamental diagram of the present invention
The scheme drawing of Fig. 6 for concerning between expression hoisting capacity Q and the amplitude R
As Fig. 1, Fig. 2, shown in Figure 3, shell 5 is the Casting Parts of a frame-type, and there is a bearing seat 25 its centre.The two ends of transverse slider guide rail 15 are fixed on the shell 5, and transverse slider 20 is enclosed within on the transverse slider guide rail 15.The two ends of circular guideway 14 are fixed on the shell 5, and it is parallel with transverse slider guide rail 15.Circular guideway 14 cooperates with transverse slider 20, to 20 auxiliary directional taggings of transverse slider, can prevent that transverse slider 20 from swinging in sliding process.The two ends of longitudinal sliding block guide rail 8 are fixed on the shell 5, and it is vertical with transverse slider guide rail 15, and longitudinal sliding block 19 is enclosed within on the longitudinal sliding block guide rail 8.One end of flexible axle 16 is fixed on the longitudinal sliding block 19, and the other end of flexible axle 16 is connected with weight sensor.Pulley bracket 12 is installed above the shell 5, and pulley 22 is installed on the pulley bracket 12, and flexible axle 16 is drawn through pulley 22.Spring 7 adopts extension spring, and it has 2.One end of spring 7 is fixed on the shell 5, and the other end is fixed on the longitudinal sliding block 19.Rocking bar 3 is an insulator, and its end is installed on the shell 5 by hinge 4, and its back side has an axial elongated slot 26.Fix a cylindrical protrusions thing on the transverse slider 20, this protrusion is enclosed within the elongated slot 26, and can slide in elongated slot 26.When transverse slider 20 horizontally slips on transverse slider guide rail 15, drive rocking bar 3 by this protrusion and rotate around hinge 4.The front of rocking bar 3 has axial sheetmetal 1,2, and sheetmetal 1,2 and sheetmetal 1 and sheetmetal 2 mutually insulated parallel by two are formed.Sheetmetal 1 and sheetmetal 2 all with shell 5 insulation, they are connected with separately the lead of drawing.Sheetmetal 2 and sheetmetal 1 are made early warning and overload moment master cock respectively.Have elongated slot 11 on the switch frame 9, switch frame 9 is fixed on the longitudinal sliding block 19 by elongated slot 11 and two screws 10.The parallel axes of the rocking bar 3 the when line of the screw of two mounting screws 10 on the longitudinal sliding block 19 and transverse slider 20 move to amplitude peak.Therefore, when transverse slider 20 moves to amplitude peak, the parallel axes of the axis of switch frame 9 and rocking bar 3.Unclamp the length that screw 10 can by-pass cock frame 9.One end of switch frame 9 is equipped with contact 24 by two nuts 6.On-insulated between contact 24 and the shell 5, be connected with on the shell 5 and draw lead.When contact 24 contacts with sheetmetal 2, just connect control circuit, send early warning signal.When contact 24 contacts with sheetmetal 1, just connect control circuit, cut off the power supply of the electrical motor of hoisting crane by executive device, realize the overload Torque Control.Rotating shaft 28 is a step axle, and rotating disk 17 is installed in the step place of rotating shaft 28, and rotating shaft 28 and rotating disk 17 are connected by flat key.One axle sleeve 36 (plain bearing) is installed on the bearing seat 25 on the shell 5, and rotating shaft 28 is enclosed within the axle sleeve 36, and respectively there is a thrust baring 35 at the two ends of axle sleeve 36.The screw thread fit of nut 34 and rotating shaft 28 1 ends is fixed on rotating shaft 28 on the bearing seat 25.The intersect vertical axis of the axis of rotating shaft 28 and transverse slider guide rail 15.Rotating disk 17 is a disc, and it is parallel with transverse slider guide rail 15.In order to hide small size, rotating disk 17 only is many hemicycles.Have a circular trough 18 on the rotating disk 17, rotating shaft 28 intersects vertically with circular trough 18.Be fixed with another cylindrical protrusions thing 27 on the transverse slider 20, protrusion 27 is enclosed within the circular trough 18, and can slide in circular trough 18.The end that shell 5 is stretched out in rotating shaft 28 is equipped with gear 23.
As shown in Figure 4, the present invention at first is fixed to a rotating shaft 31 on the crane arm 29 of luffing jib tower crane the dead in line of the hinge axis 30 on the axis of rotating shaft 31 and the hoisting crane body of the tower 33 when mounted.One end of rotating shaft 31 is installed a gear 32, gear 32 and gear 23 engagements, and gear 32 equates with the number of teeth of gear 23.When crane arm 29 during around hinge axis 30 luffing, crane arm 29 drives rotating shafts 31 and rotates, and rotating shaft 31 drives rotating disks 17 by gear 32, gear 23 and rotating shaft 28 and rotates with rotating shaft 28.Therefore, the angle that turns over of rotating disk 17 equates with the angle [alpha] that the crane arm 29 of luffing jib tower crane turns over.When rotating disk 17 rotates, drive transverse slider 20 by circular trough 18 and protrusion 27 and on transverse slider guide rail 15, horizontally slip.As Fig. 4, shown in Figure 5, when the crane arm 29 of luffing jib tower crane is in level attitude (α=0 °), be amplitude peak L, at this moment, the diameter COD of the circular trough 18 of rotating disk 17 is parallel with transverse slider guide rail 15, transverse slider 20 is in the D point, and transverse slider 20 leaves distance (amplitude) the CD maximum of rotating shaft 28, equals the diameter r of circular trough 18.When crane arm 29 turns over the α angle, amplitude equals Lcos α, at this moment, the diameter COD of circular trough 18 is driven by rotating shaft 28 and also turns over the α angle, diameter COD forwards CO ' D ' position to, circular trough 18 drives transverse sliders 20 by protrusion 27 and moves to E point on the transverse slider guide rail 15, and distance (amplitude) CE that transverse slider 20 leaves rotating shaft 28 equals rcos α.Therefore, the left and right sides position of transverse slider 20 on transverse slider guide rail 15 just reflects the size of the amplitude of luffing jib tower crane crane arm 29.When hoisting crane was sling weight, the steel rope of hoisting crane was passed to weight sensor with weight, and weight sensor drives longitudinal sliding block 19 by flexible axle 16 and moves on longitudinal sliding block guide rail 8, and when the weight of slinging reduced, spring 7 resetted longitudinal sliding block 19.Therefore, the upper-lower position of longitudinal sliding block 19 on longitudinal sliding block guide rail 8 reflects the sling size of weight of hoisting crane.When transverse slider 20 moves to left and right sides end position, make respectively near switch 21 with near switch 13 actions, connect control circuit, executive device cuts off the power supply of crane motor, realizes the restriction to crane arm 29 minimum radiuses and amplitude peak.The present invention and weight sensor will be realized the force moment protection that overloads after being installed on the luffing jib tower crane together, at first tackle switch frame 9 and regulate.As shown in Figure 6, when transverse slider 20 is moved to the B1 point, reach amplitude peak Rmax, guaranteed during manufacturing that switch frame 9 is parallel with rocking bar 3 at this moment.The rated load weight Q1 that promotes amplitude peak reaches specified hoisting moment Mo, regulates weight sensor and makes longitudinal sliding block 19 move on to the A1 point from the A point, and contact 24 contacts with sheetmetal 1.At this moment, contact 24 and sheetmetal 1 are connected control circuit, and executive device cuts off the power supply of crane motor.Then transverse slider 20 is moved to flex point (the limiting amplitude point the during biggest lifting capacity) B
2The place, the amplitude of this moment is R
g, promote maximum weight Q
2, reach specified hoisting moment M
o, longitudinal sliding block 19 moves to A
2The point.The length of by-pass cock frame 9 makes contact 24 contact with sheetmetal 1, connects control circuit, and executive device cuts off the crane motor power supply.Through amplitude peak point B
1With flex point B
2After two point locations were debugged, this limiter of moment just can normally use, and the rule mark of contact 24 is R=a.When transverse slider 20 moves to amplitude peak point B
1With flex point B
2Between any 1 B
xThe time, the amplitude of establishing this point is R
xIf this moment, contact 24 contacted with sheetmetal 1, the hoisting capacity of establishing this moment is Q
x, hoisting moment is M
x, establishing transverse slider 20 is b from the distance of abscissa R, then has:
That is: M
x=Q
xR
x=Q
1R
Max=Q
2R
g=M
oSo,, at amplitude peak point B
1With flex point B
2Between, as long as contact 24 contacts with sheetmetal 1, just reached specified hoisting moment M
o, control circuit just is switched on, and executive device cuts off the power supply of crane motor, realizes the overload force moment protection.
Claims (3)
1, the luffing jib tower crane limiter of moment, it has shell (5), transverse slider (20), be fixed on the transverse slider guide rail (15) on the shell (5), longitudinal sliding block (19), be fixed on the longitudinal sliding block guide rail (8) on the shell (5), spring (7) and flexible axle (16), transverse slider guide rail (15) is vertical with longitudinal sliding block guide rail (8), one end of spring (7) is fixed on the shell (5), the other end of spring (7) is fixed on the longitudinal sliding block (19), one end of flexible axle (16) is fixed on the longitudinal sliding block (19), it is characterized in that, one end of rocking bar (3) is installed on the shell (5) by hinge (4), rocking bar (3) has an axial elongated slot (26), elongated slot (26) cooperates with protrusion on the transverse slider (20), rocking bar (3) is an insulator, have axial sheetmetal (1) on the rocking bar (3), sheetmetal (1) and shell (5) insulation, length-adjustable switch frame (9) is installed on the longitudinal sliding block (19), contact (24) is installed on the switch frame (9), rotating shaft (28) by bearing installation on shell (5), rotating shaft (28) is vertical with transverse slider guide rail (15), fix a rotating disk (17) in the rotating shaft (28), have a circular trough (18) on the rotating disk (17), circular trough (18) intersects vertically with rotating shaft (28), circular trough (18) cooperates with ridge (27) on the transverse slider (20), rotating shaft (28) is connected with rotating shaft (31) by gear, rotating shaft (31) is fixed on the crane arm (29), the dead in line of the hinge axis (30) on the axis of rotating shaft (31) and the hoisting crane body of the tower (33).
2, limiter of moment according to claim 1, it is characterized in that, have elongated slot (11) on the switch frame (9), switch frame (9) is fixed on the longitudinal sliding block (19) by elongated slot (11) and two screws (10), the parallel axes of the line of the screw of two mounting screws (10) on the longitudinal sliding block (19) and transverse slider (20) rocking bar (3) when moving to amplitude peak.
3, limiter of moment according to claim 1 and 2 is characterized in that, the sheetmetal on the rocking bar (3) and sheetmetal (1) and sheetmetal (2) mutually insulated parallel by two are formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93115158 CN1031252C (en) | 1993-10-06 | 1993-10-06 | Moment limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93115158 CN1031252C (en) | 1993-10-06 | 1993-10-06 | Moment limiter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1095357A CN1095357A (en) | 1994-11-23 |
| CN1031252C true CN1031252C (en) | 1996-03-13 |
Family
ID=4990839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93115158 Expired - Fee Related CN1031252C (en) | 1993-10-06 | 1993-10-06 | Moment limiter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1031252C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103171984B (en) * | 2013-04-03 | 2014-12-24 | 中联重科股份有限公司 | Variable-amplitude limiting device and crane |
| CN108584734B (en) * | 2018-07-05 | 2024-04-12 | 江西飞达电气设备有限公司 | Tower crane moment amplitude limiter |
| CN110682315B (en) * | 2019-09-10 | 2020-12-22 | 安徽工程大学 | Manipulator with two-stage compliant power transmission and grabbing method thereof |
-
1993
- 1993-10-06 CN CN 93115158 patent/CN1031252C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1095357A (en) | 1994-11-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN208648384U (en) | A kind of power engineering auto take-up | |
| CN1031252C (en) | Moment limiter | |
| CN206751256U (en) | Spacing and preventing colliding with top rushes bottom stopping means above and below electric block | |
| CN2162453Y (en) | Moment limiter | |
| CN114314402B (en) | Lifting control method and device for clothes airing machine | |
| CN87206077U (en) | Hoisting limiter of hoister | |
| CN111874838A (en) | A jacking rotation mechanism for AGV dolly | |
| CN111457818A (en) | Device for monitoring rope length of winch | |
| CN112707251A (en) | Cable manufacture accomodates and uses coiling mechanism | |
| CN112850525A (en) | Motion limiting protection device for automobile crane | |
| CN2186740Y (en) | Tower crane moment limiter | |
| CN2659027Y (en) | Vertical magnetic force regulation type contact less master controller | |
| CN219971681U (en) | Transmission mechanism of insulating crane for aerial electric power construction | |
| CN220011962U (en) | Overhead transmission line tangent tower ground wire hoisting device | |
| CN2344370Y (en) | Weight retainer for hoisting equipment | |
| CN219498581U (en) | Electric door body of switch cabinet | |
| CN219259353U (en) | Automatic rail clamping device of gantry crane | |
| CN2389874Y (en) | Adjustable multifunctional limiter | |
| CN220855109U (en) | Load simulator for testing motor performance | |
| CN215981867U (en) | Support is adjusted to supervisory equipment multidimension degree | |
| CN219530381U (en) | Intelligent visual device for elevator maintenance | |
| CN220364346U (en) | Overweight alarm device of elevator | |
| CN215974784U (en) | Vertical folding type isolating switch holding pole hydraulic lifting device | |
| CN214675432U (en) | Safety production monitoring device | |
| CN213218548U (en) | Single-arm tower crane for medical surgery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |