CN102241367A

CN102241367A - Lifting anti-fall safety device

Info

Publication number: CN102241367A
Application number: CN2011101793609A
Authority: CN
Inventors: 武光
Original assignee: NANJING CHEMICAL CONSTRUCTION CO Ltd
Current assignee: NANJING CHEMICAL CONSTRUCTION CO Ltd
Priority date: 2011-06-29
Filing date: 2011-06-29
Publication date: 2011-11-16
Anticipated expiration: 2031-06-29
Also published as: CN102241367B

Abstract

The invention discloses a lifting anti-fall safety device, which is used when a steel wire rope is used for lifting or drawing a weight. The horizontal side face of a right-angle machine frame is in vertical sliding connection with a pull rod and the steel wire rope; two horizontally arranged central shafts are parallelly arranged on the vertical side face of the right-angle machine frame; each central shaft is fixedly sleeved with a cam and a gear, the cams and gears of the two central shafts are the same, and the two gears have the same number of teeth and the same modulus and are meshed with each other; the cams and gears are arranged on the inner side and outer side of the right-angle machine frame respectively, and the steel wire rope is tightly pressed between the pair of cams; the inner ends of the central shafts are both fixedly connected with the upper end of a crank; the lower end of the crank is connected with the upper ends of connecting rods by rotating pairs; the lower ends of the connecting rods are both connected with the upper end of the pull rod by rotating pairs; the other end of the pull rod is sleeved with a spring; the upper end of the spring is pressed against the lower bottom face of a horizontal side face of the right-angle machine frame, and the lower end of the spring is supported by a dogear on the lower end of the pull rod; and the lifting anti-fall safety device is small in volume and convenient to operate, can conduct an anti-fall safety protection functions during lifting and can be used as an auxiliary safety device of small mechanical lifting equipment.

Description

A kind of lifting falling-proof safety device

Technical field

The present invention relates to the fall arrest safety guard that uses when a kind of special occasions utilizes steel rope lifting or traction weight.

Background technology

The general volume of the weight-lifting equipment of general-duty hoisting heavy is all bigger, load-carrying is heavier, be a kind of have lifting and brake gear mechanical, electrical, the liquid one, but when some special occasions hoisting heavies, special under the situation of industrial erecting stage more complicated, when carrying out parts lifting installation as chemical plant inside or in some short places, general-duty plays heavy equipment and can't enter, must adopt manually lifting equipment this moment, at present, manual lifting equipment commonly used is with the steel rope lifting, but the defective of steel rope lifting is that weight falls easily, and safety can not get ensureing.

Summary of the invention

The objective of the invention is to overcome and have under the complex situations of erecting stage the unsafe problem of lifting now, a kind of lifting falling-proof safety device that conveniently can be under different situations is provided.

The technical solution used in the present invention is: have a right angle frame, vertical sliding block joint pull bar and steel rope on the right angle frame horizontal side, the center shaft of two horizontal arrangement that be arranged in parallel on the vertical side of right angle frame, each fixedly an identical cam of suit and an identical gear on each center shaft, two described gears have the identical number of teeth and modulus and are meshing with each other; Cam, gear are separately positioned on the medial and lateral of right angle frame, and steel rope presses between pair of cams; All affixed crank upper end, center shaft the inner, the crank lower end is connected with revolute pair with small end, and two described connecting rod lower ends are connected with revolute pair with the pull bar upper end simultaneously; The pull bar other end is with spring, and the bottom surface upper and lower end that the spring upper end is pressed against the horizontal side of right angle frame is supported on the crossette of pull bar lower end.

The present invention is simple in structure, volume is little, low cost of manufacture, be easy to install, be convenient to operation, the function of fall arrest safety guard-safeguard when playing lifting.The present invention also can be used as the auxiliary safety device of small-sized machine hanging device.

Description of drawings

Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.

Fig. 1 is a block diagram of the present invention;

Fig. 2 is the planar view of Fig. 1;

Fig. 3 is the erection plan of Fig. 1;

Among the figure: 1, steel rope; 2 gears; 3, cam; 4, crank; 5 connecting rods; 6, pull bar; 7, right angle frame; 8, spring; 9, center shaft; 10, flat key; 11. reel frame; 12, reel.

The specific embodiment

As shown in Figure 1, 2, the present invention mainly is installed on the right angle frame 7 by gear parts, cam portion and connecting rod mechanism part three parts; Have two holes on the horizontal side of right angle frame 7, pull bar 6 is holded up the hole of passing on the frame 7, and pull bar 6 can slide up and down in the hole of frame 7, and steel rope 1 is also holded up another hole of passing on the frame 7, and steel rope 1 also can slide up and down in the hole of frame 7.

Gear parts is made up of the gear 2 of a pair of identical number of teeth and modulus; Cam portion is by the cam 3(eccentric wheel of a pair of identical size) and center shaft 9 and forming, steel rope 1 vertically is through between the pair of cams 3, and pair of cams 3 and press steel rope 1.

Connecting rod mechanism is also connected to form by the slider-crank mechanism of two identical parameters.Two center shaft 9 sustained height horizontal arrangement, and parallel vertical side of passing right angle frame 7, each center shaft 9 is by flat key 10 cam 3 of circumferential captive joint and gears 2, cam 3 and gear 2 are installed in the both sides of right angle frame 7 respectively, gear 2 is installed in the outside of right angle frame 7, and cam 3 is installed in the inboard of right angle frame 7.Two described gears 2 have the identical number of teeth and modulus, the gear 2 of a pair of identical number of teeth and modulus is meshing with each other, like this, make gear 2 and cam 3 as a moving member along with center shaft 9 rotates synchronously, like this, the rotation of a pair of gear 2 can make pair of cams 3 can locking phases to or opposite the rotation.

Inner all captive joint crank 4 upper ends at center shaft 9, crank 4 lower ends are connected with revolute pair with connecting rod 5 upper ends, two connecting rod 5 lower ends all are connected with revolute pair with pull bar 6 upper ends simultaneously, the other end at pull bar 6 is equipped with spring 8, spring 8 upper ends are pressed against on the right angle frame 7 horizontal side bottom surfaces, and spring 8 lower ends are supported on the pull bar 6 lower end crossettes.The elastic force of spring 8 can be regulated, spring 8 elastic force are transferred big, as shown in Figure 2, the downward pulling force of pull bar 6 is just big more, pull bar 6 is downwards the time, the moment that the pulling force that produces makes the cam 3 in left side have the cam 3 on the moment of anticlockwise motion and right side to have clockwise direction to rotate is just big more, and these two moments just become big to the pressure of the generation of passing through two steel ropes 1 between the cam 3.

Referring to Fig. 3, right angle frame 7 is fixedly connected on the reel frame 11, reel frame 11 middles are provided with reel 12, and steel rope 1 twists on the reel 12.When lifting, right angle frame 7 is fixing, when rotating lifting reel 12, when haulage cable 1 down moved, steel rope 1 passed through between two cams 3, move downward by Fig. 2, friction force makes cam 3 clockwise directions in left side rotate respectively, cam 4 anticlockwise motions on right side, at this moment, this can not play shock damping action to steel rope 1 to cam 3, can not influence normal crane lifting service.Steel rope 1 makes this separate cam 3 to this friction force to cam 3, and at this moment this can't clamp steel rope 1 to cam 3, if initiatively traction this moment when drawing steel rope 1 such as artificial volume, is loosed one's grip suddenly, steel rope 1 must outward movment.Otherwise, after lifting stops, weight can spur steel rope 1 as active force, have the trend according to Fig. 2 upward movement, steel rope 1 passes through this and can produce certain friction force to time between the cam 3 at this moment, because friction force makes cam 3 anticlockwise motions in left side respectively, cam 3 clockwise directions on right side rotate, because it is tight more that eccentric throw can be pressed two cams 3 more, prevent to continue up (outward) motion thereby choke steel rope 1, reached the fixedly effect of steel rope 1.

Claims

1. one kind is lifted by crane falling-proof safety device, has a right angle frame (7), it is characterized in that: vertical sliding block joint pull bar (6) and steel rope (1) on the horizontal side of right angle frame (7), the center shaft (9) of two horizontal arrangement that be arranged in parallel on the vertical side of right angle frame (7), each center shaft (9) is circumferentially fixed a cam (3) and a gear (2) by flat key (10), and two described gears (2) have the identical number of teeth and modulus and are meshing with each other; Cam (3), gear (2) are separately positioned on the medial and lateral of right angle frame (7); Steel rope (1) presses between pair of cams (3); The all affixed crank in center shaft (9) the inner (4) upper end, crank (4) lower end is connected with revolute pair with connecting rod (5) upper end, and two described connecting rods (5) lower end all is connected with revolute pair with pull bar (6) upper end; Pull bar (6) other end is with spring (8), and the bottom surface upper and lower end that spring (8) upper end is pressed against the horizontal side of right angle frame (7) is supported on the crossette of pull bar (6) lower end.