JPH07206311A - Emergency brake device of elevator - Google Patents

Abstract

PURPOSE:To give the degree of freedom to the arrangement of a guy rope by improving the acting speed of a brake, obtaining the brake pressure equally on the right and left, and separately disposing a detecting part and a gripping mechanism (brake part). CONSTITUTION:A guy rope 10 is suspended parallel to an elevating rope 9, a detecting arm 20 having a detecting roller 13 is provided on a machine body in such a manner as to freely oscillate, and a pair of eccentric rollers 38 positioned on both sides of the guy roller 10 are provided on the machine body in such a manner as to freely rotate. The detecting arm 20 is so constructed that the detecting roller 13 is brought into contact with the elevating rope 9 with constant press-contacting force by an energizing means 30. When the tension of the elevating rope 9 is released due to breaking or the like, the eccentric side cam parts 38 of both eccentric rollers 38 are turned from the lower position to the guy rope gripping side by the oscillation of the detecting arm 20 to clamp the guy rope 10 from both sides equally and quickly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator used for elevating and lowering a work table or the like, which is arranged at a construction site or outside of a building, and in particular, an elevating rope is cut or greatly loosened. The present invention relates to an emergency braking device that automatically prevents the aircraft from falling if it gets loose.

[0002]

2. Description of the Related Art In this type of elevator, it is obliged to use two or more lifting ropes according to the safety standard and to set a safety factor of 10 or more as strength, and consideration is given to dropping.

However, it cannot be said that there is no possibility that the lifting rope will be completely broken and the machine body will fall, and for this reason, there are some which are equipped with an emergency braking device. For example,
In addition to the lifting rope, suspend the emergency restraint rope,
A centrifugal governor mechanism is provided on the machine body (gondola) side to detect the falling speed of the machine body at the start of falling, and the brake shoe etc. that is operated by the centrifugal force of the rotating flyweight to detect the drop speed of the machine body as a counterpart member. A centrifugal emergency braking device of a pressing type or an emergency restraining rope is arranged close to the lifting rope, and an intermediate portion of an L-shaped arm is rotatably supported on the body side, and one end of the arm is rotatably supported. The lifting rope is inserted in the other end, and the restraining rope is inserted in the other end. During normal operation, one end of the arm is pressed against the lifting rope by the biasing means, and in an emergency, the arm rotates and the other end claws, etc. Therefore, there is an emergency braking device that holds the restraining rope.

[0004]

The former type of centrifugal governor is inevitably operated after free fall to some extent. That is, the reaction rate is slow and the cost is high. In the latter rotary arm type, it is necessary to bring the lifting rope and the restraint rope close to each other and to keep both ropes at a predetermined distance and positional relationship, so that the restraint rope has a low degree of freedom in installation.

[0005]

In order to solve the above problems, the present invention comprises an elevating rope for suspending a machine body and a winding mechanism for winding the elevating rope, and by winding or rewinding the elevating rope. In an elevator that raises and lowers the machine body, a restraining rope is hung in parallel with the lifting rope. The detection arm is urged toward the elevating rope by the urging means to press the detection roller against the elevating rope with a constant pressing force, and the detecting roller and both eccentric rollers are tensioned to the elevating rope. When the detection arm is released, the eccentric roller's eccentric cam part rotates from the lower position to the retaining rope gripping side so that the retaining rope is pinched from both sides. It has been linked.

[0006]

In normal operation, since the lifting rope is in a tensioned state, the detection roller that abuts on it is kept at the non-detection position (normal operation position) by the tension of the lifting rope. It is kept in a rotating position away from the restraint rope. That is, it does not affect the elevation of the elevator.

When all the lifting ropes are broken, the tension of the lifting ropes instantly becomes zero, so that the detection arm swivels rapidly by its own weight and the biasing means, and is connected via a connecting mechanism such as a rack. Both eccentric rollers are rotated so that the eccentric side portion moves to the restraining rope side. As a result, the restraining rope is sandwiched between the eccentric rollers to prevent the body from falling.

[0008]

FIG. 1 is a side view of an entire elevator to which the present invention is applied. At a construction site or the like, a reader 1 is erected in a vertical posture. It is provided with a pair of guide rails 2. An upper end of a lifting rope 9 for suspending the machine body 5 and an upper end of a retaining rope 10 for emergency braking are fixed to the upper end support bracket 8 of the leader 1. The retaining rope 10 hangs vertically downward, and the lower end portion thereof is fixed to the lower end support base portion of the reader 1. The lifting rope 9 hangs downward, enters the machine body 5, and is wound around a winding mechanism (electric winch) 6 mounted on the machine body 5. By winding the lifting rope 9 by the winding mechanism 6, the machine body 5 is raised, and conversely, by rewinding,
It is designed to be lowered by its own weight.

The machine body 5 is integrally provided with a pair of upper and lower sliders 4 on the surface of the reader 1 side, and the sliders 4 are fitted on the guide rails 2 so as to be vertically slidable.

The emergency braking device for preventing the fall is composed of the restraining rope 10, an eccentric roller type gripping mechanism 15 provided on the front surface of the machine body 5, a detection roller 13 provided on the upper surface of the machine body 5, and the like. There is. The lifting rope 9 passes between the detection roller 13 and the guide roller 12 behind it, and the retaining rope 10 passes through the eccentric roller type gripping mechanism 15.

FIG. 2 is an enlarged vertical side view of the main part (II in FIG. 3).
-II sectional view), the guide roller 12 is rotatably supported on the upper end portion of a bracket 18 which is erected on the upper end surface of the machine body 5, and is more rotatably supported by the lifting rope 9 than the detection roller 13. It abuts from the rear at a high position.

The detection roller 13 is rotatably supported on the upper end portion of the detection arm 20, and the detection arm 20 is swingably attached to the upper end of a bracket 21 fixed to the upper surface of the machine body via a horizontal support pin 22. Supported and detecting roller 1
By the own weight of 3 and the biasing force of the biasing means 30, the detection arm 2
0 is urged backward (direction of arrow R). As a result, the detection roller 13 is brought into contact with the lifting rope 9 from the front with a constant load.

The detection arm 20 is interlockingly connected to each eccentric roller 38 of the eccentric roller type gripping mechanism 15 via a connecting link 23, a rod 25 having a rack 24, a pinion 26, an eccentric roller shaft 39, a transmission gear 42 and the like. ing.

The connecting link 23 has its upper end rotatably connected to the middle portion of the detection arm 20 via a pin 28, and its lower end rotatably connected to the upper end of the rod 25 via a pin. ing.

The rod 25 is attached to the body 5 and is attached to the upper and lower portions 1.
The pair of support guide bosses 27 are fitted so as to be vertically movable. The lower end of the rod 25 is connected to the biasing means 30 having a coil spring 33 built therein, and the coil spring 3
The elastic force of 3 urges the rod 25 downward, and the urging force and the weight of the detection roller 13 press the detection roller 13 against the lifting rope 9 with a constant load.

The biasing means 30 includes, for example, an outer cylinder 31 fixed to the lower guide boss 27, an inner cylinder 32 slidably fitted in the outer cylinder 31, and an upper cylinder and a lower cylinder in the inner cylinder 32. The rod 25 is composed of a coil spring 33 contracted so as to be capable of expanding and contracting in the direction. The rod 25 is connected to the inner cylinder 32 by a nut 35 or the like, whereby the rod 25 can move integrally with the inner cylinder 32 and the mounting length thereof can be adjusted. It is like this.

The gripping mechanism 15 includes a bearing case 36 fixed to the front surface of the machine body 5, an eccentric roller shaft 39 rotatably supported by the bearing case 36, and an eccentric roller 38 fixed to the eccentric roller shaft 39. , Transmission gear 42 and pinion 2
It is composed of 6 etc.

In FIG. 3, which is a sectional view taken along line III-III of FIG.
Two elevating ropes 9 are provided at intervals on the left and right, and a pair of detection rollers 13 is provided on the left and right, and each abuts on each elevating rope 9. Rod 25, rack 2
4 and pinion 26 are also provided in a pair on the left and right respectively.

The eccentric rollers 38 are arranged on the left and right with the retaining rope 10 in between, and are also arranged in two steps in the vertical direction. Therefore, the eccentric roller shafts 39 are also arranged in two steps in the vertical direction, one pair each on the left and right. A transmission gear 42 (FIG. 4) is also provided on each roller shaft 39, and the left and right transmission gears 42 mesh with each other. The pinion 26 is arranged only on the roller shaft 39 on the left side in the upper stage, and
4 and is arranged only on the right roller shaft 39 in the lower stage and meshes with the right rack 24.

Two elevating ropes 9 are provided at right and left intervals, and a pair of detection rollers 13 is provided on the left and right, and abuts on each elevating rope 9. Rod 2
5, a pair of racks 24 and pinions 26 are also provided respectively on the left and right sides.

One pair of eccentric rollers 38 are provided on both the left and right sides of the restraining rope 10, and two pairs of them are arranged at intervals vertically. The pair of upper roller shafts 39 is attached to the left side roller shaft 39 of the pinion 26. Is fixed to the left side rack 24
The pair of lower roller shafts 39 are linked to the right rack 24 with the pinion 26 fixed to the right roller shaft 39.

FIG. 4 is a perspective view of the power transmission mechanism portion of the lower eccentric roller 38. When the right rack 24 is moved downward, the right roller shaft 39 is moved through the right pinion 26 to the arrow direction. X1 direction (clockwise when viewed from the front)
Simultaneously with the rotation, the left roller shaft 39 rotates in the direction of arrow X2 via both transmission gears 42.

The eccentric roller 38 in the upper stage of FIG. 3 is moved by the left side rack 24 to move the left side pinion 26.
The left roller shaft 39 is rotated in the direction of arrow X2 (counterclockwise when viewed from the front) via the gears, and at the same time, the right roller shaft 39 is rotated in the direction of arrow X1 via both transmission gears 42. There is.

FIG. 5A shows the state of the eccentric roller 38 at the time of normal operation of the elevator, so that the center O2 of the eccentric roller 38 is substantially below the axis O1 of the roller shaft 39. Is held. That is, the eccentric side portion (cam portion) 38a is set so that the eccentric direction is downward, and in an emergency, each eccentric roller 38 rotates in the X1 and X2 directions as described above, and each eccentric side portion 38a. Approaches the retaining rope side from below, and as shown in FIG. 5B, the retaining rope 10 is gripped from both left and right sides.

In FIG. 6A, each eccentric roller 38
Has a V-shaped annular groove 43 on the outer circumference, and the frictional force is increased by the wedge effect. During normal operation, both eccentric rollers 38 are separated from the outer peripheral surface of the restraining rope 10 by a certain gap. However, the spacing is such that the retaining rope 10 does not protrude from between the V-shaped annular grooves 43.

The operation will be described. During normal operation, as shown in FIG. 4, since the lifting rope 9 is in a tensioned state, the detection roller 13 contacting this is kept at the non-detection position (normal operation position) by the tension of the lifting rope 9, and as a result, ,
Both eccentric rollers 38 are kept in a rotational position away from the restraining rope. That is, it does not affect the elevation of the elevator.

If, for example, one of the two lifting ropes 9 on the right side of the two lifting ropes 9 shown in FIG. 3 is broken, the tension of the lifting rope 9 on the right side instantly becomes 0. Due to the own weight of 13 and the urging means 30, it quickly rotates in the direction of arrow R in FIG. Rack 24 at the same time
Moves downward and rotates the pinion 26 on the right side, and rotates both eccentric rollers 38 in the X1 and X2 directions via the roller shaft 39 and both transmission gears 42. As a result, the restraining rope 10 is sandwiched between the eccentric rollers 38,
Prevent the body 5 from falling.

When the one lifting rope 9 on the left side of FIG. 3 is broken, the upper eccentric roller 38 is activated, and when all two ropes are broken, the upper and lower eccentric rollers 38 are broken. Operate.

[0029]

As described above, according to the present invention, (1) eccentric rollers are arranged on both the left and right sides of the restraining rope, and in an emergency, both eccentric rollers are simultaneously and symmetrically rotated to restrain the restraining rope. Since it is tightened, the restraining rope can be quickly clamped evenly on the left and right sides with a short rotation stroke.

(2) In an emergency, both eccentric rollers rotate so that their eccentric side portions move from the lower side to the retaining rope side. Therefore, the frictional force between the retaining rope and the eccentric roller at the start of falling is The retaining rope acts on the side where the rope is tightened, and the clamping force increases sharply. The so-called braking effectiveness is improved.

(3) Detecting roller 1 that contacts the lifting rope
3 and the eccentric roller 38 that holds the restraining rope 10 between
Since they are arranged separately, the degree of freedom in arranging the restraint rope 10 is increased, and the installation work of the elevator can be facilitated.

[Brief description of drawings]

FIG. 1 is an overall side view of an elevator including an emergency braking device according to the present invention.

FIG. 2 is a vertical sectional side view of a main part.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a perspective view of a power transmission portion of the emergency braking device.

FIG. 5 is a front view showing the operation of the eccentric roller,
(A) is a normal operation, (B) is an emergency.

FIG. 6 is a horizontal sectional view showing the operation of the eccentric roller,
(A) is a normal operation, (B) is an emergency.

[Explanation of symbols]

 1 leader 5 machine body 6 winding mechanism 9 lifting rope 10 restraining rope 13 detection roller 20 detection arm 24 rack 25 rod 26 pinion 30 biasing means 38 eccentric roller 39 eccentric roller shaft

Claims (1)

[Claims] 1. An elevator including a lifting rope for suspending a body and a winding mechanism for winding the lifting rope, wherein the lifting rope is raised or lowered by winding or rewinding the lifting rope. The suspension and the machine body are provided with a detection arm having a detection roller swingably and a pair of eccentric rollers located on both sides of the retaining rope so as to be rotatable, and the detection arm is provided by an urging means. The detection roller is pressed against the lifting rope with a certain pressing force by being urged to the lifting rope side, and the detection roller and both eccentric rollers are moved by the swing of the detection arm when the tension of the lifting rope is released to move the eccentric roller. The emergency brake device for an elevator characterized in that the eccentric side cam part is interlockingly connected so that the eccentric cam part pivots from the lower position to the holding rope holding side to sandwich the holding rope from both sides. Place