CN105540471A - Steel wire rope pre-tightening force applying system - Google Patents
Steel wire rope pre-tightening force applying system Download PDFInfo
- Publication number
- CN105540471A CN105540471A CN201610105789.6A CN201610105789A CN105540471A CN 105540471 A CN105540471 A CN 105540471A CN 201610105789 A CN201610105789 A CN 201610105789A CN 105540471 A CN105540471 A CN 105540471A
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- Prior art keywords
- brake
- brake sheave
- wheel hub
- pulley
- steel rope
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/28—Other constructional details
- B66D1/40—Control devices
- B66D1/42—Control devices non-automatic
- B66D1/46—Control devices non-automatic electric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/28—Other constructional details
- B66D1/36—Guiding, or otherwise ensuring winding in an orderly manner, of ropes, cables, or chains
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cage And Drive Apparatuses For Elevators (AREA)
- Ropes Or Cables (AREA)
Abstract
The invention discloses a steel wire rope pre-tightening force applying system which comprises a guide wheel set, a first brake pulley set, a force measuring mechanism and a controller. The guide wheel set comprises a guide wheel carrier and two guide wheels. A steel wire rope penetrating gap is arranged between the two guide wheels. The first brake pulley set comprises a pulley carrier and one or more brake pulleys. Each brake pulley comprises a rotatable outer hub, and rope grooves are formed in the peripheries of the outer hubs. The brake pulleys comprise brake control input ends connected with the controller. The force measuring mechanism comprises a support and a pulley, and a pressure sensor is mounted below the support. The pressure signal output end of the pressure sensor is connected with the controller. The guide wheel set, the first brake pulley set and the force measuring mechanism are sequentially arranged, and therefore a steel wire rope can firstly penetrate through the steel wire rope penetrating gap of the guide wheel set, then be wound around the brake pulleys in the brake pulley set, press the pulley in the force measuring mechanism and finally be wound around a winch. By means of the steel wire rope pre-tightening force applying system, it can be guaranteed that the steel wire rope can be orderly and tightly wound around the winch, inter-rope wear is reduced, and the service life of the steel wire rope is prolonged.
Description
Technical field
The present invention relates to steel rope preload Technique field in hoisting crane hoisting operation, particularly a kind of steel rope pretension afterburner system.
Background technology
During crane job, steel rope needs to keep certain tension force, to ensure that steel rope neatly, is closely wound around in elevator being entangled in elevator process.This afterburning and the process being entangled to elevator is the work of steel rope pretension to steel rope.
Steel rope pretension will significantly hoisting cable winding mass, reduces the wearing and tearing between steel rope, prevents from dodging the bad phenomenon such as seam, rope skipping, final hoisting cable service life.
Steel rope without pretension in use there will be the bad phenomenon such as disorder cable, rope, gently then reduces service life of steel wire rope, heavy then cause steel rope or reel to damage, serious threat Hoisting Security.
In prior art, have and adopt plate disc brake or electromagnetic power brake to originate as resisting moment, and then realize steel rope pretension, but still there is following defect in it.
Plate disc brake is applied to predetermincd tension afterburner system and there is following shortcoming:
1. plate disc brake can produce a large amount of heat energy when braking for a long time, promotes rapidly the temperature of high brake disc and slipper.The friction coefficient will reduced between brake disc and slipper after temperature raises, causes lock torque to reduce, and makes predetermincd tension uneven;
2. great-moment brake all adopts hydraulic braking mode, need regulate hydraulic system pressure ability adjustable brake moment, controls inconvenience and respond slowly;
3. drg works long hours and makes slipper rapid wearing, and maintenance intervals is short;
4. plate disc brake uses, maintains faults such as improperly easily causing eccentric wear, scream.
Electromagnetic power brake is applied to predetermincd tension afterburner system and there is following shortcoming:
1. electromagnetic power brake allowable rotating speed is up to 3000 rpms, and maximum speed of revolution cannot provide high resistant moment, must select reductor in addition, make system complex, huge, and is not easy to safeguard;
2. electromagnetic power brake heating is comparatively concentrated, and heat radiation will cause magnetic service life reduction even to cause drg stuck not in time.
Summary of the invention
The technical problem to be solved in the present invention is: adopt brake sheave that steel rope is entangled in elevator process in zero load and can keep certain tension force, thus ensure that steel rope can neatly be wrapped on elevator closely, improve wirerope-winding quality, reduce wearing and tearing between rope, the final service life extending steel rope.
The technical scheme that the present invention takes is specially: a kind of steel rope pretension afterburner system, comprises guiding wheels, the first brake sheave group, force measuring machine, the second brake sheave group and controller; Wherein:
Guiding wheels comprise guiding wheel carrier and two track adjusting wheels, and the rotation that two track adjusting wheel wheel shafts are parallel to each other is installed on guiding wheel carrier, and is provided with Wirerope reeving gap between two track adjusting wheels;
First brake sheave group and the second brake sheave group all comprise pulley yoke and more than 1 brake sheave be installed on pulley yoke respectively, and each brake sheave comprises rotating outer wheel hub, and outer wheel hub periphery is provided with grooving; Brake sheave comprises control for brake input end, described control for brake input end connection control device; First brake sheave group and the second brake sheave group are axially arranged in parallel,
Force measuring machine comprises support, rotates the pulley be installed on support, and is installed on the pressure sensor below support; The signal output end connection control device of pressure sensor;
Guiding wheels, the first brake sheave group, force measuring machine and the second brake sheave group set gradually, and the brake sheave in the first assembly pulley and the sheave shaft in force measuring machine are to being parallel to each other, first steel rope can be passed from the Wirerope reeving gap of guiding wheels, then around the brake sheave in the first brake sheave group and the second brake sheave group, press through the pulley in force measuring machine simultaneously.
In the present invention, brake sheave can adopt prior art Related product, when in the race of steel rope in brake sheave through out-of-date, brake sheave can provide one to brake square, i.e. resistance, and this resistance will increase steel wire tensioning power.When applying, by controlling the lock torque of brake sheave, the object regulating steel wire tensioning power can be reached.And the setting of force measuring machine, while making steel rope press through pulley, pressure effect can be produced to the pressure sensor under support, this pressure can change according to the change of steel wire tensioning power, therefore, the force value that the real-time tensile force of steel rope can export according to pressure sensor draws, controller goes to control brake sheave according to the real-time tensile force of steel rope again, namely achieve the closed loop control of steel rope pretension reinforcing, can effectively improve wirerope-winding quality.
Preferably, the first brake sheave group and the second brake sheave group comprise more than 2 brake sheave respectively, are coaxial setting between described more than 2 brake sheave.Brake sheave quantity in a brake sheave group is established depending on required lock torque, because the lock torque that single brake sheave provides is limited, when it can not meet the pretension requirement of steel rope, then need to arrange multiple brake sheave, what specifically can adopt the mode hoisting cable applied step by step goes out rope tension.
Conveniently staff's knowing in time the real-time tensile force of steel rope, the present invention also comprises display module, the input end connection control device of display module.The real-time tensile force data obtained can be sent to display module with display by controller.Display module can adopt prior art.
Further, the present invention also comprises radiator; In first brake sheave group and the second brake sheave group, be provided with coolant circulation passage in the wheel shaft of brake sheave, axle stub is provided with refrigerant fluid entrance and cooling liquid outlet, and cooling liquid outlet is connected with radiator with entrance.Cooling liquid outlet and entrance also can be connected with outer loop pump.Brake sheave can produce heat in braking procedure, and refrigerant fluid can prevent heat accumulation from having an impact to deceleration and stopping performance.
Preferably, force measuring machine also comprises fixable supporting leg, and pedestal lower end side is rotationally connected supporting leg, opposite side setting pressure sensor.When steel rope presses through pulley, support will rotate on supporting leg, thus apply pressure to pressure sensor, and when steel wire tensioning power changes, the pressure passing to pressure sensor also can change.The fixed form of support also can adopt other prior art, can avoid the whole skew of Ce Li mechanism, and does not affect the acquisition of pressure sensor to pressure.
Preferably, the brake sheave that the present invention adopts comprises from inside to outside coaxial inner wheel hub, annular yoke and the outer wheel hub arranged successively;
For being fixedly connected with between inner wheel hub with annular yoke;
The periphery of annular yoke is provided with coil groove, and be provided with excitation coil in coil groove, the power connector end of excitation coil is the control for brake input end of brake sheave; Be provided with the accommodating gap of magnetic between annular yoke and outer wheel hub, magnetic is provided with magnetic in accommodating gap; Closed guard is provided with between the accommodating gap of magnetic and coil groove;
The both sides of annular yoke, are rotationally connected respectively by clutch shaft bearing and the second bearing between inner wheel hub and outer wheel hub; The periphery of outer wheel hub is provided with steel wire rope groove.
When applying, above-mentioned multiple brake sheave is coaxially connected by the wheel shaft of brake sheave group and is fixed on pulley yoke.During work, inner wheel hub always keeps static, and outer wheel hub is connected by bearing with inner wheel hub, and outer wheel hub freely can be rotated around inner wheel hub.Drawn by excitation coil by wire, to provide work action current, the exit of described excitation coil is the control for brake input end of brake sheave.When namely producing magnetic field in annular yoke after excitation coil energising, under the effect in this magnetic field, magnetic will move towards to form magnetic chain according to magnetic line of force, when outer wheel hub rotates relative to inner wheel hub, magnetic chain produces friction drag by the inside face of outer wheel hub and the outside face of inner wheel hub, stop outer wheel hub to rotate, thus form lock torque.In addition, when outer wheel hub overcomes lock torque rotation, magnetic chain will be sheared, cause the friction of magnetic chain inside, strengthen lock torque, Hoist braking effect.When in excitation coil during no current, do not have magnetic field in annular yoke, magnetic cannot form magnetic chain, and magnetic is in loose condition (of surface), and cannot produce lock torque, outer wheel hub is free to rotate.Therefore only need to utilize prior art control size of current in excitation coil or with or without, the size of lock torque can be controlled as required in real time, meet requirement of engineering.
In above-mentioned brake sheave, annular yoke both sides and be also provided with side shield respectively between clutch shaft bearing and the second bearing, the top of described side shield extends to outer wheel hub bottom.The setting of side shield can prevent magnetic from leaking between interior outer wheel hub and bearing, causes mechanism blockage.
Beneficial effect of the present invention is: by adopting brake sheave, steel rope is entangled in elevator process in zero load and can keeps certain tension force, thus ensure that steel rope can neatly be wrapped on elevator closely, improve wirerope-winding quality, reduce wearing and tearing between rope, the final service life extending steel rope.Simultaneously the present invention coordinates Ce Li mechanism and controller to make the present invention can realize the closed loop control of steel wire tensioning power, lock torque real-time, tunable and mode is simple, and speed of response is very fast, easy to maintenance.Structural volume of the present invention is less simultaneously, and running noises is also lower.
Accompanying drawing explanation
Figure 1 shows that present system structural representation;
Figure 2 shows that brake sheave group wiring structural representation;
Figure 3 shows that wheel design schematic diagram;
Figure 4 shows that the first brake sheave group or the second brake sheave group structural representation;
Figure 5 shows that force measuring machine structural representation;
Figure 6 shows that a kind of brake sheave structure assembling schematic diagram of embodiment;
Figure 7 shows that the localized axial cross-sectional view of Fig. 6 brake sheave.
Detailed description of the invention
Further describe below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, steel rope pretension afterburner system of the present invention, comprises guiding wheels 1, first brake sheave group 2, force measuring machine 3, second brake sheave group 5 and controller 4; Wherein:
Guiding wheels 1 comprise guiding wheel carrier 11 and the rotation that is parallel to each other of two track adjusting wheels, 12, two track adjusting wheel 12 wheel shafts is installed on guiding wheel carrier 11, and are provided with Wirerope reeving gap 13 between two track adjusting wheels 12;
More than 1 brake sheave 22 that first brake sheave group 2 and the second brake sheave group 5 all comprise pulley yoke 21 respectively and be installed on pulley yoke 21, each brake sheave 22 comprises rotating outer wheel hub 23, and outer wheel hub 23 periphery is provided with grooving 24; Brake sheave 22 comprises control for brake input end, described control for brake input end connection control device 4; First brake sheave group 2 and the second brake sheave group 5 are axially parallel to each other;
Force measuring machine 3 comprises support 31, rotates the pulley 32 be installed on support 31, and is installed on the pressure sensor 33 below support 31; The signal output end connection control device 4 of pressure sensor 33;
Guiding wheels 1, first brake sheave group 2 and force measuring machine 3 set gradually, and the brake sheave 22 in the first assembly pulley 2 is axially parallel to each other with the pulley 32 in Ce Li mechanism 3, first steel rope can be passed from the Wirerope reeving gap 13 of guiding wheels 1, then around the brake sheave 22 in the first brake sheave group 2 and the second brake sheave group 5, press through the pulley 32 in the force measuring machine 3 between two-system running block simultaneously, be finally entangled in elevator.Steel rope please refer to shown in Fig. 2 around mode in the first brake sheave group and the second brake sheave group.
In the present invention, brake sheave can adopt prior art Related product, when in the race of steel rope in brake sheave through out-of-date, brake sheave can provide one to brake square, i.e. resistance, and this resistance will increase steel wire tensioning power.When applying, by controlling the lock torque of brake sheave, the object regulating steel wire tensioning power can be reached.And the setting of force measuring machine, while making steel rope press through pulley, pressure effect can be produced to the pressure sensor under support, this pressure can change according to the change of steel wire tensioning power, therefore, the force value that the real-time tensile force of steel rope can export according to pressure sensor draws, controller goes to control brake sheave according to the real-time tensile force of steel rope again, namely achieve the closed loop control of steel rope pretension reinforcing, can effectively improve wirerope-winding quality.
Embodiment
As shown in Figure 1, in the present embodiment, the second brake sheave group 5 forms identical with the first brake sheave group 2 structure, and only brake sheave number needs there are differences according to factors such as rope outlet direction, lock torque requirements.First brake sheave group 2 and the second brake sheave group 5 comprise more than 2 brake sheave respectively, are coaxial setting between described more than 2 brake sheave.Brake sheave quantity in a brake sheave group is established depending on required lock torque, because the lock torque that single brake sheave provides is limited, when it can not meet the pretension requirement of steel rope, then need to arrange multiple brake sheave, what specifically can adopt the mode hoisting cable applied step by step goes out rope tension.
Conveniently staff's knowing in time the real-time tensile force of steel rope, the present invention also can arrange display module, the input end connection control device of display module.The real-time tensile force data obtained can be sent to display module with display by controller.Display module can adopt prior art.
Further, the present invention also can arrange radiator 6, as shown in Figure 1; In first brake sheave group and the second brake sheave group, be provided with coolant circulation passage in the wheel shaft of brake sheave, axle stub is provided with refrigerant fluid entrance 25 and cooling liquid outlet 26, and cooling liquid outlet is connected with radiator 6 with entrance.Cooling liquid outlet and entrance also can be connected with outer loop pump.Brake sheave can produce heat in braking procedure, and refrigerant fluid can prevent heat accumulation from having an impact to deceleration and stopping performance.
As Fig. 4, force measuring machine 3 also comprises fixable supporting leg 35, and pulley 32 is installed on support 31 by the first axis of rotation; Side, support 31 lower end is rotationally connected supporting leg 35 by the second rotating shaft 36, opposite side setting pressure sensor 33.When steel rope presses through pulley 32, support 31 will rotate on supporting leg 35, thus apply pressure to pressure sensor 33, and when steel wire tensioning power changes, the pressure passing to pressure sensor 33 also can change.The fixed form of support also can adopt other prior art, can avoid the whole skew of Ce Li mechanism, and does not affect the acquisition of pressure sensor to pressure.
Composition graphs 5 and Fig. 6, the brake sheave that the present embodiment adopts comprises from inside to outside coaxial inner wheel hub 26, annular yoke 25 and the outer wheel hub 23 arranged successively;
For being fixedly connected with between inner wheel hub 26 with annular yoke 25;
The periphery of annular yoke 25 is provided with coil groove, is provided with excitation coil 27 in coil groove; Be provided with the accommodating gap of magnetic between annular yoke 25 and outer wheel hub 23, magnetic is provided with magnetic in accommodating gap; Closed guard 28 is provided with between the accommodating gap of magnetic and coil groove;
The both sides of annular yoke 25, are rotationally connected respectively by bearing 29 between inner wheel hub 26 and outer wheel hub 23.
When applying, above-mentioned multiple brake sheave is coaxially arranged, and is connected by the wheel shaft of brake sheave group and is fixed on pulley yoke.During work, inner wheel hub always keeps static, and outer wheel hub is connected by bearing with inner wheel hub, and outer wheel hub freely can be rotated around inner wheel hub.Drawn by excitation coil by wire, to provide work action current, the exit of described excitation coil is the control for brake input end of brake sheave.When namely producing magnetic field in annular yoke after excitation coil energising, under the effect in this magnetic field, magnetic will move towards to form magnetic chain according to magnetic line of force, when outer wheel hub rotates relative to inner wheel hub, magnetic chain produces friction drag by the inside face of outer wheel hub and the outside face of inner wheel hub, stop outer wheel hub to rotate, thus form lock torque.In addition, when outer wheel hub overcomes lock torque rotation, magnetic chain will be sheared, cause the friction of magnetic chain inside, strengthen lock torque, Hoist braking effect.When in excitation coil during no current, do not have magnetic field in annular yoke, magnetic cannot form magnetic chain, and magnetic is in loose condition (of surface), and cannot produce lock torque, outer wheel hub is free to rotate.Therefore only need to utilize prior art control size of current in excitation coil or with or without, the size of lock torque can be controlled as required in real time, meet requirement of engineering.
In above-mentioned brake sheave, annular yoke 25 both sides and be also provided with side shield 282 respectively between clutch shaft bearing and the second bearing 29, the top of side shield 282 extends to outer wheel hub 23 bottom.
Controller of the present invention can possess data sampling and processing, display and controlling functions, concrete:
1. predetermincd tension shows in real time: use pressure sensor to gather predetermincd tension coherent signal, steel wire tensioning force data can be shown in real time after treatment;
2. predetermincd tension controls in real time: predetermincd tension controls can realize automatically controlling and Non-follow control two kinds of control methods, and manually with automatically changeable:
A. during automatic control mode, the predetermincd tension parameter that system can be preset is run, and according to actual pretension force value nonstick system of control movable pulley, compensates the predetermincd tension fluctuation because external cause causes, make predetermincd tension keep stable;
B. during Non-follow control, the entity button by the different control overflow of correspondence sends control overflow, then controller will require to control according to response limiting, not automatically adjust;
3. security of system monitoring:
A. contrast brake sheave rotating speed and steel rope rope speed, time inconsistent, automatically reduce predetermincd tension requirement, avoid causing steel rope or brake sheave wearing and tearing owing to producing relative motion between steel rope and brake sheave;
B. monitor predetermincd tension numerical value, take appropriate measures when actual predetermincd tension is greater than most ceiling value, guarantee the safety of steel rope and rope woolding system;
C. read cooling-liquid temperature by set temperature sensor, and regulate circulation pump power according to this temperature traverse, ensure system good heat radiating.
System of the present invention is when applying, and working process is as follows:
First steel rope is extracted out from wooden reel, first pass between guiding wheels, then around the first brake sheave group and the second brake sheave group, press through force measuring structure, last steel rope is connected with elevator after passing pretension afterburner system simultaneously;
Then according to steel rope parameter and predetermincd tension requirement, arrange associated control parameters in the controller, then system brings into operation control;
Start elevator, by wirerope-winding in elevator.In the process, steel rope will be wrapped on elevator after being applied in predetermincd tension.
When being applied on elevator machinery, the arm head assembly pulley on assembly pulley of the present invention replacement hoisting crane can be used.When empty hook lifting needs pretension, corresponding switch can be opened in control cabin, to open pretension afterburner system.When not needing pretension afterburning, close corresponding switch.
The present invention can keep certain tension force by adopting brake sheave to make steel rope to be entangled in elevator process in zero load, thus ensure that steel rope can neatly be wrapped on elevator closely, improve wirerope-winding quality, reduce wearing and tearing between rope, the final service life extending steel rope.Simultaneously the present invention coordinates Ce Li mechanism and controller to make the present invention can realize the closed loop control of steel wire tensioning power, lock torque real-time, tunable and mode is simple, and speed of response is very fast, easy to maintenance.Structural volume of the present invention is less simultaneously, and running noises is also lower.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (7)
1. a steel rope pretension afterburner system, is characterized in that, comprises guiding wheels, the first brake sheave group, force measuring machine, the second brake sheave group and controller; Wherein:
Guiding wheels comprise guiding wheel carrier and two track adjusting wheels, and the rotation that two track adjusting wheel wheel shafts are parallel to each other is installed on guiding wheel carrier, and is provided with Wirerope reeving gap between two track adjusting wheels;
First brake sheave group and the second brake sheave group all comprise pulley yoke and more than 1 brake sheave be installed on pulley yoke respectively, and each brake sheave comprises rotating outer wheel hub, and outer wheel hub periphery is provided with grooving; Brake sheave comprises control for brake input end, described control for brake input end connection control device; First brake sheave group and the second brake sheave group are axially arranged in parallel,
Force measuring machine comprises support, rotates the pulley be installed on support, and is installed on the pressure sensor below support; The signal output end connection control device of pressure sensor;
Guiding wheels, the first brake sheave group, force measuring machine and the second brake sheave group set gradually, and the brake sheave in the first assembly pulley and the sheave shaft in force measuring machine are to being parallel to each other, first steel rope can be passed from the Wirerope reeving gap of guiding wheels, then around the brake sheave in the first brake sheave group and the second brake sheave group, press through the pulley in force measuring machine simultaneously.
2. steel rope pretension afterburner system according to claim 1, is characterized in that, also comprise radiator; In first brake sheave group and the second brake sheave group, be provided with coolant circulation passage in the wheel shaft of brake sheave, axle stub is provided with refrigerant fluid entrance and cooling liquid outlet, and cooling liquid outlet is connected with radiator with entrance.
3. steel rope pretension afterburner system according to claim 1, is characterized in that, the first brake sheave group and the second brake sheave group comprise more than 2 brake sheave respectively, is coaxial setting between described more than 2 brake sheave.
4. steel rope pretension afterburner system according to claim 1, is characterized in that, also comprise display module, the input end connection control device of display module.
5. the steel rope pretension afterburner system according to any one of Claims 1-4, it is characterized in that, force measuring machine also comprises fixable supporting leg, and pedestal lower end side is rotationally connected supporting leg, opposite side setting pressure sensor.
6. the steel rope pretension afterburner system according to any one of Claims 1-4, is characterized in that, brake sheave comprises from inside to outside coaxial inner wheel hub, annular yoke and the outer wheel hub arranged successively;
For being fixedly connected with between inner wheel hub with annular yoke;
The periphery of annular yoke is provided with coil groove, and be provided with excitation coil in coil groove, the power connector end of excitation coil is the control for brake input end of brake sheave; Be provided with the accommodating gap of magnetic between annular yoke and outer wheel hub, magnetic is provided with magnetic in accommodating gap; Closed guard is provided with between the accommodating gap of magnetic and coil groove;
The both sides of annular yoke, are rotationally connected respectively by clutch shaft bearing and the second bearing between inner wheel hub and outer wheel hub.
7. brake sheave according to claim 6, is characterized in that, annular yoke both sides and be also provided with side shield respectively between clutch shaft bearing and the second bearing, and the top of described side shield extends to outer wheel hub bottom.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610105789.6A CN105540471B (en) | 2016-02-26 | 2016-02-26 | A kind of steel wire rope pretension afterburner system |
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| CN201610105789.6A CN105540471B (en) | 2016-02-26 | 2016-02-26 | A kind of steel wire rope pretension afterburner system |
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| CN105540471A true CN105540471A (en) | 2016-05-04 |
| CN105540471B CN105540471B (en) | 2017-11-28 |
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| CN114455496A (en) * | 2021-12-28 | 2022-05-10 | 赵雨晴 | Pulley block used on automatic feeding conveyor |
| CN116534754A (en) * | 2023-07-06 | 2023-08-04 | 成都久和至诚智能装备有限责任公司 | Steel wire rope pre-tightening system and method for crane working mechanism |
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| CN114455496A (en) * | 2021-12-28 | 2022-05-10 | 赵雨晴 | Pulley block used on automatic feeding conveyor |
| CN116534754A (en) * | 2023-07-06 | 2023-08-04 | 成都久和至诚智能装备有限责任公司 | Steel wire rope pre-tightening system and method for crane working mechanism |
| CN116534754B (en) * | 2023-07-06 | 2023-11-21 | 成都久和至诚智能装备有限责任公司 | Steel wire rope pre-tightening system and method for crane working mechanism |
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| CN105540471B (en) | 2017-11-28 |
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