SU1500617A1 - Jib hoisting gear - Google Patents

Description

The invention relates to lifting ^and ny devices with hydraulic or. pneumatically driven boom.

The purpose of the invention is to increase reliability by increasing the force of pressing the roller to the cheeks. The boom lift mechanism comprises a strut 1, a boom 2 and a power cylinder 3 pivotally associated with them. At the end of the boom 2

2

The hook 4 is pivotally suspended. In the upper part of the rack 1, the cheeks 5 are fixed with straight grooves 6 arranged at an angle to the horizon that exceeds the friction angle between the roller and the cheeks with the top facing the opposite side of the hook 4. The guide 9 of each cheek 5 is shaped curve, described ?! by the equation y = (A - 1) · £ β </ · χ * λ VI ^ -x ¹ , where x and y are the coordinates of the curve with origin at. the point of intersection of the vertical path of the hook 4 with the longitudinal axis of the groove 6; (V is the angle of inclination of the groove 6; 1 is the distance from the axis of the hook 4 to the end roller, 8; Λ is the ratio of the

standing between the rollers 7 and 8 to the value of 1. When the load is raised or lowered, the arrow 2 makes a complicated movement, since the axis of the roller 7, around which it rotates, displace: along the groove 6. A strictly vertical lifting of the axis of the hook 4 is caused by the guide 9, along which the end roller 8 moves from top to bottom.

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The invention relates to lifting devices with hydraulic or pneumatic boom.

The purpose of the invention is to increase reliability by increasing the force of pressing the roller to the cheeks.

FIG. 1 shows a device, side view; in fig. 2 - the shape of curved guides. ten

The boom lift mechanism comprises a strut 1, a boom 2 and a power cylinder 3 pivotally connected with them. At the end of the boom 2 a hook 4 is pivotally suspended. The cylinder 3 is inclined at a height of 15 to 15 of the hook 4. straight-line grooves 6 are made, inclined to the horizontal at an angle οί, whose apex is facing to the side, ^ 0 opposite to the hook 4. The arrow 2, placed between the cheeks 5, is provided with rollers 7 and 8, which are installed ¹ in the groove 6 and on curved guides 9 cheek 5 from the opposite side 4. Each hook guide 9 has the shape of a curve described by the equation:

y = (λ-1) ί8ο (· χ thx7'1 ^g -x ^g , ³⁰

where x and y are the coordinates of the curve with the beginning at the point of intersection of the vertical trajectory of the hook 4 with the longitudinal axis 35 of the groove a 6;

1 - the distance from the hook 4 to the end roller 8;

X is the ratio of the distance between the rollers 7 and 8 to the magnitude of 1.

Practically, the angle c / take is not less than 5 ... 7 °, since during operation of the lifting mechanism on slopes there is friction of sliding of the side surfaces of the boom 2 along the cheeks 5.

Jib lifting mechanism works as follows.

To lift the load include power cylinder 50 Z.na pushing the rod. The arrow 2 acquires a complex movement, since the axis of the roller 7, around which it rotates, is displaced along the groove 6. 55

Strictly vertical lifting of the axis of the hook 4 due to the guide

along which the end roller 8 of the boom 2 moves from top to bottom.

Lower the load by turning on the power cylinder 3 to retract the rod or install the control spool in the floating position.

During the lowering of the load, the rollers 7 and 8 of the boom 2 move along the groove 6 and the guide 9 in the opposite direction.

The positive effect from the use of the proposed device is a reliable closure of the kinematic pair of curved guide 9 - roller 8.

Claims (1)

Claim The boom lift mechanism is primarily for container ships, containing a stand equipped with a pair of cheeks with straight grooves and curved guides, and a boom with a hook suspension at one end connected to the stand by means of rollers that can be rotated in a vertical plane by a power cylinder, one of the rollers being mounted to movement in these grooves, and the other is installed on the other end of the boom with the ability to interact with curved guides, characterized in that, in order to Increase reliability by increasing the vortex pressing to the cheeks, the straight groove is made at an angle to the horizon, exceeding the friction angle between the roller and the cheeks, with the top facing the opposite side of the hook, and the shape of the curved guides is described by the equation: y = (Α -1) ϋβσί · χ * χ · / ΐ ^ -x " ¹ , where x and y are the coordinates of the curve with the beginning at the intersection of the vertical trajectory of the hook suspension, with the longitudinal axis of the groove; c / is the angle of inclination of the groove to the horizon; 1 - distance from the hook suspension to the end roller; Λ is the ratio of the distance. between the rollers to the value of 1. 1500617