Disclosure of Invention
The invention aims to solve the problem of providing a pitching follow-up rope-winding arm lever mechanism, a crossing frame and a control method, which can enable an arm lever to automatically pitch up and down along with the up-and-down movement of a lifting trolley by the up-and-down movement of the lifting trolley in the axial direction of the lifting trolley, so that the number of mechanisms and operators is reduced, and the cost is reduced.
The technical scheme provided by the invention is as follows:
the utility model provides a follow-up wiring armed lever mechanism of pitch, includes armed lever, stand, mount, lifting trolley, the stand sets up in the middle of the mount, and the armed lever rotation axis connects on the stand, is equipped with the lifting trolley slide rail of cooperation lifting trolley up-and-down motion on the stand, still includes pulley mechanism, pulley mechanism includes wire rope, lifting trolley assembly pulley, support body pulley, mast assembly pulley, armed lever pulley, support body pulley is located on the mount, the mast assembly pulley is located the pole setting top, the armed lever pulley is located the armed lever is terminal, wire rope one end fixed connection in the mount, and lifting trolley assembly pulley, support body pulley, mast assembly pulley are walked around in proper order to the other end; the lifting trolley pulley block ascends or descends, the length of the steel wire rope on the lifting trolley pulley block and the frame pulley segment correspondingly shortens or lengthens, the length of the steel wire rope on the mast pulley block and the length of the arm rod pulley segment correspondingly lengthens or shortens, and after the length of the steel wire rope on the mast pulley block and the arm rod pulley segment lengthens or shortens, the arm rod rotates downwards under the action of gravity and the arm rod rotates upwards under the action of downward traction force of the lifting trolley.
The crossing frame comprises a rope winding arm lever mechanism which is driven by the pitching machine, and also comprises a driving mechanism, wherein the driving mechanism is an electric winch; the electric hoist makes the lifting trolley pulley block rise or fall.
As a further improvement, the two groups of lifting trolley pulley blocks and the two groups of frame pulleys are respectively arranged at two sides of the lifting trolley, and comprise a lifting trolley first pulley block, a frame first pulley, a mast pulley block, a frame second pulley and a lifting trolley second pulley block, wherein the lifting trolley first pulley block and the lifting trolley second pulley block are arranged at two sides of the lifting trolley, and the frame first pulley and the frame second pulley are arranged on the fixing frame; two wire rope one end fixed connection in the mount, the other end is in proper order around lifting trolley second assembly pulley, support body second pulley, mast assembly pulley, armed lever pulley, mast assembly pulley, lifting trolley first assembly pulley behind the support body first pulley fixed connection on the hoist engine, and electric hoist engine makes lifting trolley assembly pulley rise or descend.
As a further improvement, the fixing frame comprises a first fixing point and a second fixing point which are used for fixing two ends of the steel wire rope, the first pulley block of the lifting trolley and the second pulley block of the lifting trolley are concentrically and symmetrically arranged, and the first fixing point and the second fixing point are respectively coaxially arranged with the circle centers of the first pulley block of the lifting trolley and the second pulley block of the lifting trolley.
As a further improvement, the lifting trolley pulley block is a movable pulley and is provided with n movable pulleys, and the number of the movable pulleys and the multiplying power of the steel wire rope are changed to determine the pitching speed and the final pitching angle of the arm lever.
As a further improvement, the pulley of the frame body, the pulley block of the mast and the pulley block of the lifting trolley are close to the upright post in the vertical direction.
A pitch-following rope winding arm lever control method comprises the following steps: starting a lifting trolley, wherein the lifting trolley moves upwards or downwards along a sliding rail, pulls the steel wire rope to move up and down relative to the upright post, and pulls the arm rod to move in a pitching mode; when the lifting trolley moves upwards along the sliding rail, the distance between the second pulley block of the lifting trolley and the second pulley of the frame body is reduced, the distance between the first pulley block of the lifting trolley and the second pulley of the frame body is reduced, and the arm rod stretches the steel wire rope by utilizing the dead weight, so that the arm rod is ensured to dip downwards; when the lifting trolley moves downwards along the sliding rail, the lifting trolley stretches from the steel wire rope to the trolley direction by utilizing the pulling force, the distance between the second pulley block of the lifting trolley and the second pulley of the frame body is driven to be increased, and the distance between the first pulley block of the lifting trolley and the second pulley of the frame body is increased, so that the upward tilting of the arm lever is ensured.
As a further improvement, the lifting trolley is closed, the electric winch stops working, the winch brake closes the band-type brake, so that the lifting trolley is stopped at a required position, a locking mechanism is further arranged on the lifting trolley, and when the lifting trolley is stopped at a certain position for a long time, a locking rod at the bottom of the lifting trolley is connected with a locking gear, and the lifting trolley is locked for the second time.
The invention has the following advantages:
1. through the up-and-down operation of the lifting trolley, the pitching follow-up action of the arm lever is automatically realized, the number of mechanisms and operators is reduced, and the expenditure of cost is reduced.
2. The pitch speed and the use angle range of the arm lever can be adjusted by adjusting the distance between the steel wire ropes among the pulley blocks.
3. The steel wire rope turns to the transition through the armed lever pulley on the armed lever, is not fixed connection, and the armed lever can be to steel wire rope automatic balance.
Detailed Description
As shown in fig. 1-3, a crossing frame using a pitch-and-tilt follow-up rope-winding arm mechanism is composed of pulley blocks mounted on an arm 10, a mast 2, a fixing frame 30 and a lifting trolley 40, a steel wire rope 5 for controlling the pitch-and-tilt motion of the arm 10, a frame body, the arm, an electric hoist and the like.
The arm 10 is hinged to the lifting trolley 40 by a pin and can rotate at the hinge. The steel wire rope 5 is finally fixed on the frame body through the two end heads of the upper mast pulley 2, the arm lever pulley 1, the frame body pulleys 3 and 6 and the lifting trolley pulley blocks 4 and 7.
The pitch speed and final pitch angle of the boom 10 can be varied by adjusting the wire rope magnification between the frame pulley 3 and the lifting trolley pulley block 4, the wire rope magnification between the frame pulley 6 and the lifting trolley pulley block 7, or the wire rope magnification between the mast pulley block 2 and the boom pulley 1.
The arm lever 10 moves up and down along with the lifting trolley 40, the proportion of the length of the steel wire rope 5 between the frame pulley 3 and the lifting trolley pulley block 4 and between the frame pulley 6 and the lifting trolley pulley block 7 is changed, so that the length of the steel wire rope 5 between the mast pulley block 2 and the arm lever pulley 1 changes correspondingly along with the lifting movement of the arm lever.
The electric hoist 50 includes a reel 51, a speed reducer 52, a brake 53, and a motor 54 connected in series. The electric winch 50 is placed on the ground and fixed through a ground anchor, the electric winch 50 adopts a double-rope-outlet structure of two steel wire ropes, one end of each steel wire rope is fixed on the right side of the winch drum 51, the other end of each steel wire rope is fixed on the upper hanging point of the lifting trolley 40 through a pulley block, one end of each steel wire rope is fixed on the right side of the winch drum 51, the other end of each steel wire rope is fixed on the bottom hanging point of the lifting trolley 40 through the pulley block, and the lifting trolley 40 is wound in and released in the winch drum through the steel wire ropes, so that up-down movement is realized.
The rope winding mode is as follows: one end of the through-length steel wire rope 5 is fixed on a second fixed point, then reaches the arm rod pulley block 1 through the lifting trolley pulley block 4, the frame pulley 3 and the mast pulley block 2, then turns to the mast pulley block 2 through the arm rod pulley block 1, passes through the lifting trolley pulley block 7 and the frame pulley 6 from the other side, and finally is fixed on the first fixed point again at the other end of the steel wire rope 5.
Arm lever pitching working principle: when the lifting trolley 40 ascends along the lifting trolley sliding rail 50, the distance between the lifting trolley pulley block 4 and the frame pulley 3 is reduced, and the distance between the lifting trolley pulley block 7 and the frame pulley 6 is reduced; after the distance is shortened, the steel wire rope 5 with a larger distance can be outwards inclined along with the dead weight of the arm rod 10 and pulled between the mast pulley block 2 and the arm rod pulley 1, and the steel wire rope 5 between the mast pulley block 2 and the arm rod pulley 1 is lengthened, so that the arm rod is downwards bent; conversely, when the lifting get off, the distance between the lifting trolley pulley block 4, the frame pulley 3, the lifting trolley pulley block 7 and the frame pulley 6 can be increased, after the distance is increased, the steel wire rope 5 required by the distance can be withdrawn from the steel wire rope 5 between the mast pulley block 2 and the arm pulley block 1, the steel wire rope 5 between the mast pulley block 2 and the arm pulley 1 is shortened, and the upward tilting action of the arm is realized. The arm rod 10 rotates downwards along with the arm rod under the action of gravity, rotates upwards along with the arm rod under the action of downward traction force of the lifting trolley, and finally realizes the butt joint of the crossing frame on the spanned object in the processes of up-and-down running of the lifting trolley and the follow-up pitching of the arm rod, so as to form a protection area.