CN108946529A - Anti-squat system is played after preceding spademan drag-line is anti- - Google Patents

Abstract

The invention relates to a front-spreading-wing cable-type anti-rear bullet and anti-tilt device, which belongs to the technical field of hoisting and engineering machinery safety. The invention mainly solves the technical problems of stress concentration, unreasonable stress and easy bending and breaking of the main arm existing in the anti-backward anti-ballistic and anti-backward device of the crane. The technical scheme adopted in the present invention is: a front-spreading cable-type anti-rear bullet and anti-reclining device, which consists of a front-spreading arm bar, a limit device, an anti-reclining cable, a tensioning mechanism, a cable tension sensor and It is composed of three-in-one pitching and pitching drive device; the rear part of the front spreader arm is installed on the outside of the main arm; one end of the anti-backward cable is fixed on the head of the main arm, and the other end is fixed on the tensioning mechanism; The tensioning mechanism is installed on the head of the front-spreading arm; the cable tension sensor is installed on the anti-reclining cable; the three-in-one pitching drive device is installed on the outside of the rear of the front-spreading arm , the motor shaft of which is connected with the rotary shaft at the rear of the front wing-spreading arm.

Description

Front wing cable type anti-rear bullet and anti-tilt device

technical field

The invention relates to a front-spreading-wing cable-type anti-rear bullet and anti-tilt device, which belongs to the technical field of hoisting and engineering machinery safety.

Background technique

Crawler and all-terrain cranes are mobile cranes that install the lifting operation part on the crawler and tire chassis, and rely on the crawler and tire device for walking. Crawler and all-terrain cranes are versatile: crawler and all-terrain cranes can be used for material lifting, transportation, loading and unloading, and installation. Crawler and all-terrain cranes have the advantages of strong lifting capacity, small grounding specific pressure, small turning radius, large climbing ability, no need for outriggers, driving with load, good operating stability, and the height of the truss combination can be freely replaced. , municipal, bridge, petrochemical, water conservancy and hydropower and other construction industries are widely used.

Safety is very important during the operation of crawler and all-terrain cranes, which involves not only the safety of hoisting equipment, but also the safety of personal and hoisted goods. Once the back tilt phenomenon of crawler belt and all-terrain crane occurs, it will lead to serious accidents. Therefore, the anti-rear bullet and anti-reverse tilt are paid attention to in the safety design of crawler and all-terrain cranes.

The back tilt phenomenon of crawler and all-terrain cranes occurs when the boom is rebounded backwards when it is subjected to backward wind force or the cargo suddenly falls during small-scale operations. For example, during the hoisting process of wind power blades, a sudden strong wind or hoisting coordination error will cause the blades to hit the tower or crane arm, break the blades, and cause sudden unloading. If a group of blades are hoisted at the same time, if one blade is broken, it will cause the swing of other blades, and then the other blades will be broken, resulting in two or more sudden unloading. Sudden unloading will cause the boom to spring back, the consequences of which are disastrous and extremely dangerous.

The existing anti-backball and anti-backward device of a crane adopts the form of an anti-backward bumper. The bumper is a sleeve telescopic mechanism, the upper end of which is hinged on the boom, and the lower end is hinged on the turntable, and expands and contracts with the pitching of the boom. A buffer spring is installed in the sleeve, which has the functions of buffering, damping and limiting the boom. The bumper also has a combination of hydraulic pressure or oil and gas. This method concentrates the stress, and the force is very unreasonable, which will cause the main arm to bend and break.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned technical problems existing in the existing crane anti-ballistic and anti-backward device, and to provide a front-spreading cable-type anti-backball and anti-backward device. The device can completely replace the existing anti-backball and anti-backward device of the crane, and can make the mechanical state better than the present situation, and avoid the bending damage of the arm frame by the anti-backball and anti-backward device.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A front-spreading cable-type anti-rear ballistic and anti-reclining device, which is driven by a front-spreading arm bar, a limit device, an anti-reclining cable, a tensioning mechanism, a cable tension sensor and a three-in-one pitch The device and other components; the limit device includes a limit enhanced pressure rod, a front limit pin and a rear fixed limit block; The revolving hinge point is concentric with the axis; one end of the anti-backward cable is fixed on the head of the main boom, and the other end is fixed on the tensioning mechanism; the tensioning mechanism is installed on the head of the front spreader arm; The tension sensor of the cable is installed on the anti-reclining cable and close to the pivot point of the main arm; The tail rotary shaft of the wing-type arm is connected; the pitching rotary shaft of the limit-enhanced pressure bar is installed on the outside of the rotary platform, so that when it is turned to a horizontal position, its lower surface is pressed to the upper surface of the front-wing-type arm; The front limit pin and the rear fixed limit block are installed at the bottom of the main arm.

When the front spreader cable-type anti-rear ballistic and anti-reversal device is used for a complex jib combined with a crawler track and an all-terrain crane main and auxiliary jib, it can be set separately or simultaneously on the main jib and the jib.

Further, when the auxiliary arm is equipped with this device, the front wing-spreading arm is installed on the outside of the auxiliary arm, and its rotary hinge point is coaxial with the rotary hinge point at the root of the auxiliary arm; one end of the anti-backlash cable is fixed on the auxiliary arm The head and the other end are fixed on the tensioning mechanism; the connection mode of the limit device, the tensioning mechanism, the cable tension sensor and the three-in-one pitching drive device is the same as that of the anti-bounce and backward tilting device of the main boom.

The beneficial effects of the present invention are:

1) The force is reasonable, safe and reliable. The force point of the anti-backward bumper device of the existing crawler belt and all-terrain crane is at a point close to the bottom of the main boom. This way the stress is concentrated, and the force is very unreasonable, which will cause the main boom to bend and break. The focus points of the caterpillar and all-terrain crane anti-backward safety rope device proposed by the present invention are at the head of the main arm and the head of the auxiliary arm, which are similar to the stress on the main arm and auxiliary arm when lifting objects, and are more in line with the mechanical properties of the boom. The force is reasonable, avoiding the new stress concentration, and the safety is high.

2) The present invention can ensure the safety of hoisting objects, hoisting equipment and on-site construction personnel, is beneficial to protect property safety and personnel safety, and creates more safety benefits.

3) Simple processing and convenient assembly. Most of the mechanism structures used in the device are standard parts or common parts, and the procurement cost is low. The mechanism module is clear, and the assembly is simple and convenient.

4) The structure is reasonable and the functions are perfect. The anti-backward function of the main arm and the anti-backward function of the auxiliary arm can be realized separately. That is, when the main arm is in working condition, only the main arm anti-bounce and backward tilting device of the main arm frame is installed. In other working conditions with a jib, the jib anti-bounce back device of the jib frame is installed together with the jib. The two are separated in mechanism and coordinated in function.

Description of drawings

Fig. 1 is a three-dimensional overall schematic diagram of the anti-rear bullet device of the present invention when it operates in a small range;

Fig. 2 is a three-dimensional partial schematic view of the anti-rear bullet device of the present invention when it is operating in a small range;

Fig. 3 is an overall front view of the anti-rear recoil device of the present invention when it is operating in a small range;

Fig. 4 is a partial front view of the anti-rear recoil device of the present invention when it is operating in a small range;

Fig. 5 is an overall front view of the recoil prevention device according to the present invention when it is operating in a large or medium range;

Fig. 6 is a partial front view of the recoil prevention device according to the present invention when it is operating in a large or medium range;

Figure 7 is an enlarged view of the cable tension sensor of the present invention;

In the figure: 1—Front spread wing arm, 2—Three-in-one pitching drive device, 3—Anti-reverse cable, 4—Limiting enhanced pressure bar, 5—Tension mechanism, 6—Cable tension sensor , 7—front limit bolt, 8—rear fixed limit block.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figures 1 to 4, the front-spreading cable type anti-rear bullet and anti-reclining device in this embodiment consists of a front-spreading arm bar 1, a limit device, an anti-reclining cable 3, and a tensioning device. The tightening mechanism 5, the cable tension sensor 6 and the three-in-one pitching and pitching drive device 2 are composed; the limit device includes a limit strengthening pressure rod 4, a front limit bolt 7 and a rear fixed limit block 8; the front extension The rear part of the wing arm is installed on the outside of the main arm, and its rotary hinge point is coaxial with the rotary hinge point at the root of the main arm; one end of the anti-backward cable is fixed on the head of the main arm, and the other end is fixed on the tensioning mechanism ; The tensioning mechanism is installed on the head of the front wing-spread arm; The cable tension sensor is installed on the anti-reverse cable and near the pivot point of the main arm; the three-in-one pitch drive The device is installed on the outer side of the rear part of the front wing-spreading arm, and its motor shaft is connected to the rear rotary shaft of the front wing-spreading arm; the pitching rotary shaft of the limit-enhanced pressure bar is installed on the outer side of the rotary platform so that it turns to the horizontal position, its lower surface is pressed to the upper surface of the front spreader arm; the front limit pin and the rear fixed limit block are installed at the bottom of the main arm. The tensioning mechanism 5 is a hoisting mechanism and is not limited to the hoisting mechanism.

When the front spreader cable type anti-rear ballistic and anti-reverse device of the present invention is used for a complex boom combined with crawlers and all-terrain crane main and auxiliary arms, it can be installed separately or simultaneously on the main arm and the auxiliary arm.

When the auxiliary arm is equipped with this device, the front wing-spreading arm is installed on the outside of the auxiliary arm, and its rotary hinge point is coaxial with the rotary hinge point at the root of the auxiliary arm; one end of the anti-backward cable is fixed on the head of the auxiliary arm, The other end is fixed on the tensioning mechanism; the connection mode of the limit device, the tensioning mechanism, the cable tension sensor and the three-in-one pitching drive device is the same as that of the anti-bounce and backward tilting device of the main boom.

Working process of the present invention is:

1) Small amplitude working state, as shown in Figure 1 to Figure 4. The front wing arm 1 is rotated to the horizontal working position by the three-in-one driving device 2. At this time, the clutch installed in the three-in-one driving device 2 separates the front wing arm 1 from the driving device. 4 to limit. When the angle between the main arm and the horizontal plane is less than 85°, the anti-backward cable 3 is in a pre-tightened state. Once the angle between the main arm and the horizontal plane reaches or exceeds 85°, the anti-backward cable 3 is tightened to effectively prevent backlash. Tilting effect, effectively guarantee the safety of the crane.

2) Large and medium amplitude working state, as shown in Figure 5 and Figure 6. The front wing boom 1 is retracted and locked to the position of the side midplane of the main boom with the front limit pin 7 and the rear fixed limit block 8, and the anti-backward cable 3 is still tensioned to play the role of lateral reinforcement of the boom . The limit reinforcement pressure rod 4 is retracted and locked on the mast. After the front wing arm 1 reaches the limit position of the rear fixed limit block 8 on the side middle surface of the main arm, the clutch installed in the three-in-one pitching drive device 2 separates the front wing arm 1 from the driving device, The front wing-spreading boom 1 can do any pitching motion with the main boom.

3) The effect of the cable tension sensor 6. As shown in Figure 7, the cable tension sensor 6 is installed on the anti-reclining cable 3, and the anti-reclining cable 3 is tightened so that the spring on the cable tension sensor 6 is compressed to detect the anti-reclining cable in real time. 3 pull. The detected tension value is transmitted to the driver's cab through wireless transmission, providing a reference for the driver's operation, which can effectively increase the safety of hoisting operations.

Specifically, the calculation and verification method of the diameter of the anti-recoil cable 3 refers to the following formula:

L=cosθC

In the formula: L is the point-line distance between the straight line where the anti-reclining cable 3 is located and the hinge of the main arm and the slewing platform, θ is the angle between the plumb line of the anti-reclining cable 3, and C is the position of the cable bar fixing the cable and The distance between the main boom and the hinge of the slewing platform.

S=M/L

In the formula: S is the maximum working static tension of the anti-reclining cable 3, and M is the reclining moment.

Fmin≥Sn

In the formula: Fmin is the minimum breaking force of the anti-backward cable 3, and n is the safety factor, which is selected according to the working level of the mechanism and the working state of the anti-backward cable 3.

Fmin＝ _K'd ² σt

In the formula: K' is the empirical conversion coefficient, d is the nominal diameter of the cable, and σ _t is the cable grade indicating the breaking force level of the anti-backward cable 3.

K'=fkπ/4

In the formula, f is the filling factor of the anti-backlash cable 3, and k is the conversion factor of the nominal loss.

The above is the embodiment of the present invention described in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

Claims (3)

1. playing anti-squat system after a kind of preceding spademan drag-line is anti-, which is characterized in that by preceding unfolding wing type armed lever, limiting device, prevent Hypsokinesis drag-line, strainer, cable tension sensor and three-in-one flexion-extension driving device composition；The limiting device includes limit Enhance compression bar, front limit bolt and fixes limited block afterwards；The preceding unfolding wing type armed lever tail portion is mounted on the outside of principal arm, revolution hinge Point is concentric with the revolution hinge of principal arm root；Described anti-hypsokinesis drag-line one end is fixed on principal arm head, and the other end, which is fixed on, to be opened In tight mechanism；The strainer is mounted on preceding unfolding wing type armed lever head；The cable tension sensor is mounted on anti-hypsokinesis and draws The position of revolution hinge on rope and close to principal arm；Before the three-in-one flexion-extension driving device is mounted on outside unfolding wing type armed lever rear portion Axis connection is turned round in side, motor reel and preceding unfolding wing type armed lever tail portion；The pitching rotating shaft of the limit enhancing compression bar is mounted on On the outside of revolving platform, when it being made to go to horizontal position, lower surface is pressed onto preceding unfolding wing type armed lever upper surface；The front limit bolt Principal arm bottom position is mounted on rear fixed limited block.

2. playing anti-squat system after preceding spademan drag-line according to claim 1 is anti-, it is characterised in that: the preceding spademan is drawn It is cable-styled it is anti-after when playing knockdown for the crawler belt and the full Terrain Cranes major-minor arm complicated cantilever crane of anti-squat system, can in principal arm and Auxiliary is separately provided or is arranged simultaneously.

3. playing anti-squat system after preceding spademan drag-line according to claim 2 is anti-, it is characterised in that: the auxiliary setting When the present apparatus, preceding unfolding wing type armed lever is mounted on the outside of auxiliary, turns round hinge and the revolution hinge of auxiliary root is concentric；After anti- Drag-line one end of inclining is fixed on auxiliary head, and the other end is fixed on strainer；Limiting device, strainer, cable tension pass Sensor and the three-in-one connection type for pitching driving device are identical as tilting device is played after the anti-cantilever crane of principal arm.