JPH0330386Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a safety device for elevators, in particular for drum-type elevators, which can detect an abnormality in the tension applied to a lifting rope and also detect when the capacity of an elevator car is exceeded. It is something.

[Conventional technology]

A conventional drum type elevator will be explained with reference to FIGS. 5 to 9.

Fig. 5 is a diagram showing the overall configuration of a conventional drum type elevator, Fig. 6 is a cross-sectional view taken along the - line in Fig. 5, Fig. 7 is an enlarged view of the safety device, and Fig. 8 is a diagram of Fig. 7. - A cross-sectional view along the line, Figure 9 is of Figure 7 -
It is a sectional view along a line.

In the figure, 1 is the elevator hoistway, 2 is the elevator car, 3 is the main rope for hanging the car 2, and 4 is the beam fixed to the top of the hoistway 1.
A hanging wheel 5 is rotatably provided on the beam 4. 6 is a guide rail that guides the travel of the car 2, 7 is a bracket that supports the guide rail 6 on the wall of the hoistway 1, 8 is a machine room provided at the lower side of the hoistway 1, and 9 is a machine room 8. 10 is a winding drum of this motor 9 with a speed reducer, one end of the main rope 3 is fixed to this winding drum,
The other end is fixed to an upper beam 12 constituting a car frame 11 of the car 2 via a hanging wheel 5. 13 is a car position detection device installed above the hoistway 1;
If the car 2 should rise above the top floor stop position, this will be detected and the power to the motor 9 will be cut off. Reference numeral 14 denotes a car position detection device provided below the hoistway 1, which detects this and cuts off the power to the motor 9 if the car 2 should descend below the lowest floor stop position. A guide shoe 15 guides the car 2 up and down along the guide rail 6. 1
Reference numeral 6 denotes a support beam to which a door opening/closing device (not shown) is fixed, and is fixed to the car frame 11. Further, a bracket 17 is provided between the upper beam 12 and the support beam 16 to which a rope socket 21, which will be described later, is fixed. A rope socket 21 is fixed to one end of the main rope 3, and is provided on the bracket 17 via a spring 22 so as to be movable in the vertical direction. 23 is fixed to the tip of the rope socket 21 with a nut 21a, and both rope sockets 2
1 and 21 are connected, and a detection rod 24 for detecting load is vertically adjustable with a nut 24a at a position equidistant from both rope sockets 21, 21, and a notch is provided at one end. 23a is provided, and this notch 23a is provided with a pin 23b. 30 is a switch box fixed to the support beam 16 via a support bracket 29, and this box has brackets 31, 32, 33, 34, 3
5 is attached. Reference numeral 41 denotes a detection lever for detecting a load, which is rotatably supported by the bracket 33 in a vertical plane with its substantially central portion as a fulcrum by a shaft 41b. A compression spring 42 is provided between them. 43 is a load detection switch provided on the bracket 35, and its roller 43a is provided so as to face a cam 41a provided at the other end of the detection lever 41. Reference numeral 44 denotes an L-shaped detection lever for detecting overtension or loosening of the main rope 3. The lever 44 is supported by a shaft 44c on the bracket 32 so that its bent portion can freely rotate in a vertical plane. It is arranged to be perpendicular to the detection plate 23 having a notch 23a, and when the pin 23b of the detection plate 23 moves up and down in FIG. 7, it presses against the upper or lower side of the notch 44a, rotating the detection lever 44 It is configured as follows. Reference numeral 45 designates an overtension/relaxation detection switch provided on the bracket 31, in which a roller 45a is provided opposite to a cam 44b provided at the other end of the detection lever 44 and having protrusions A and B on the left and right sides.

Next, the load detection and main rope overtension/relaxation detection operations of the above-mentioned conventional safety device will be explained.

When the car 2 becomes overloaded, the rope socket 21 rises relative to the car 2, so the detection rod 24 rises together with the detection plate 23, and the detection lever 41 is moved around the shaft 41b by the compression spring 42 accordingly. 7, the cam 41a of the detection lever 41 pushes the roller 43a of the load detection switch 43 to detect an overload condition.

On the other hand, if the car 2 goes too far over the top floor and collides with the hanging wheel 5 etc. due to the car position detection device 13 not working, etc., and the motor 9 continues to rotate,
Since the main rope 3 is pulled even though the car 2 is at rest, the spring 22 is compressed further than the normal compressed position. Therefore, the pin 23b of the detection plate 23 presses against the upper side of the notch 44a of the detection lever 44, rotating the detection lever 44 clockwise in FIG. , the roller 45a of the relaxation detection switch 45 is pushed in to detect an abnormal state.

In addition, if an abnormality occurs such as the main rope 3 being cut, the emergency stop device (not shown) activated, or the shock absorber (not shown) being pushed down, the spring 22 will automatically release, contrary to the above. Detection plate 2
3 pin 23b is in the notch 44a of the detection lever 44
The detection lever 44 is rotated counterclockwise in FIG. 7 about the shaft 44c by pressing the lower side of the cam 44.
The roller 45a of the overtension/relaxation detection switch 45 is pushed in at the lower part (b) to similarly detect an abnormal state.

[Problem that the invention attempts to solve]

The above-mentioned conventional device had the following problems.

First, the load detection section (bottom left in FIG. 7) connects the detection lever 41 and load detection switch 43 to the support beam 16.
However, during installation and adjustment, it is necessary to insert your hand through the gap A between the upper beam 12, the support beam 16, and the bracket 17, resulting in very poor workability. Ta.

Next, in the main rope overtension/relaxation detecting section (right side in FIG. 7), there are Since there is a gap between them, the detection lever 4 is generated due to the generation of vibration to the extent that the cam 44b does not push the roller 45a when the elevator is operating.
4 may shake and the pin 23b may hit the upper and lower sides of the notch 44a, causing vibration noise.
In order to adjust the operating position of the detection switch 45, it is necessary to perform a large number of adjustments such as the detection lever 44, the cam 44b, the detection switch 45, etc., resulting in a problem of poor workability.

The present invention aims to solve the above-mentioned conventional problems.

[Means and actions to solve the problem]

This invention aims to improve workability during installation and adjustment by attaching the load detection section to the top of the support beam. By eliminating the gap with the lever, the generation of vibration noise is prevented, and the detection switch can be easily adjusted.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a diagram showing the overall configuration of the safety device of this embodiment, and corresponds to FIG. 7, and FIG. 2 is a schematic sectional view taken along the - line in FIG. 1, and corresponds to FIG. 8. 3 is a plan view of FIG. 1.

In the figure, the same reference numerals as in FIGS. 7 to 9 indicate the same parts. First, the structure of the load detection section will be explained. 50 is a bracket attached to the bent part 16a of the support beam 16, and 51 is this bracket 5.
0, and this bracket 51 has brackets 33, 3 attached as before.
5. A detection lever 41, a detection switch 43, etc. for detecting the load are installed. This load detection section is different from the conventional one in that the detection rod 52, which is vertically adjustable and provided on the detection plate 23 with a nut 24a, is oriented upward, contrary to the conventional one. For this reason, the compression spring 53 is also provided between the bracket 51 and the detection lever 41 so as to bias the detection lever 41 clockwise about the shaft 41b, contrary to the conventional case. Furthermore, as shown in FIG. 3, in this embodiment, the load detection switch 4
Two sets of cams 3 and cams 41a are provided, so that two different load values can be detected.

Next, the configuration of the overtension/relaxation detection section of the main rope 3 will be explained. Reference numeral 60 is an arm fixed to the detection plate 23, and one end is connected to the link 61 by the shaft 60a.
It is attached to the shaft. 62 is the bent portion 1 of the support beam 16
A bracket is attached to the bracket 6b, a bracket 63 is attached to the bracket 62 so as to be adjustable in vertical and horizontal directions, and a Y-shaped lever 64 is attached to the bracket 63 by a shaft 63a;
One end is pivotally attached to the link 61 by a shaft 61a, and the other end is divided into an upper piece 64a and a lower piece 64b, forming a substantially Y-shape. Reference numeral 65 designates an overtension/relaxation detection switch box attached to the bracket 62, to which a lever 65b is pivotally attached via a shaft 65a. 65c connects the lever 65b to the shaft 65
a compression spring that biases counterclockwise around a;
65d is a stopper that limits the rotation of the lever 65b, and when the lever 65b rotates counterclockwise, a built-in overtension/relaxation detection switch (not shown) is activated. 66 is the shaft 66
This is a cross-shaped lever pivoted to the switch box 65 by a, and a claw 66b formed at the tip of the right side engages a pin 65e fixed to the lever 65b, thereby releasing a compression spring 65c. The lever 65b is prevented from rotating against this force. 66c is a pin fixed to the left side of the cross-shaped lever 66, and the upper and lower pieces 64a and 64 of the Y-shaped lever 64 are connected to each other.
It is located between b. 66d is the upper piece of the cross-shaped lever, 66e is the lower piece, and the lever 65
It is located close to b.

Next, the operation of this embodiment will be explained.

First, to explain the operation of the load detection section, when the car 2 becomes overloaded, the detection rod 52 moves up relative to the car 2, together with the rope socket 21 and the detection plate 23, as in the conventional case.
The detection lever 41 is rotated counterclockwise about the shaft 41b. As a result, the cam 41a pushes the roller 43a and operates the detection switch 43. In this case, since there are two sets of the cam 41a, the roller 43a, and the detection switch 43, the detection switch 43
By changing the operating point by moving the position up or down, two different types of loads can be detected.

Next, the overtension/relaxation detection section of the main rope 3 will be explained. If the car 2 rises too high due to non-operation of the car position detection device 13 and the motor 9 continues to rotate even after colliding with the hanging wheel 5, the main rope 3 will be compressed further than the normal compression position. . For this reason,
Via the detection plate 23, arm 60, and link 61,
The Y-shaped lever 64 rotates clockwise around the shaft 63a. As a result, the upper piece 64 of the Y-shaped lever 64
a pushes the pin 66c downward, and the cross-shaped lever 66
In order to rotate the lever counterclockwise around the shaft 66a, the claw 66b and the pin 65e are disengaged, and the lever 65b is rotated against the shaft 65a by the compression spring 65c.
The overtension/relaxation detection switch is activated.

Conversely, if the main rope 3 is cut, the emergency stop device (not shown) is activated, or the shock absorber (not shown) is pushed down, the spring 22 will extend to its natural length, contrary to the above. , This time, the lower piece 64b of the Y-shaped lever 64 pushes the pin 66c upward, and the claw 66b and pin 65e disengage in the same way as above, causing the lever 65b to rotate counterclockwise about the shaft 65a. Therefore, the overtension/relaxation detection switch is activated.

As described above, according to this embodiment, since the load detection section is located at the upper part of the support beam 16, the upper beam 16
2. Since it is easily accessible through the gap A between the support beam 16 and the bracket 17, installation and adjustment work can be easily performed. Further, since the overtension/relaxation detection section does not have a gap between the detection plate 23 and the detection lever 44 unlike the conventional one, it does not generate vibration noise during elevator operation. In this embodiment, the Y-shaped lever 64
Although there is a gap between the upper and lower pieces 64a, 64b and the pin 66c of the cross-shaped lever 66, the upper and lower pieces 64a,
When the pin 64b hits the pin 66c, the overtension/relaxation detection switch is activated, and since it does not hit the pin 66c during normal operation, no vibration noise is generated. Furthermore, in the unlikely event that the compression spring 65c is damaged and the claw 66b and pin 65e are disengaged, the lever 65
Even if b does not rotate, the upper piece 66d or the lower piece 66e of the cross-shaped lever 66 rotates the lever 65b to the shaft 65.
Since the switch is pushed counterclockwise around point a, the overtension/relaxation detection switch operates reliably. Furthermore, overtension,
The relaxation detection section can be adjusted by simply adjusting the position of the Y-shaped lever 64. Specifically speaking, Y-shaped lever 64
It is only necessary to adjust the attachment position of the bracket 63, which is attached to the bracket 62 by the shaft 63a, with respect to the bracket 62. That is, by moving the bracket 63 left and right, the upper and lower pieces 64a, 6 of the Y-shaped lever 64 can be moved.
4b and the pin 66c, and by moving the bracket 63 up and down, the upper and lower pieces 6
The inclinations of 4a and 64b can be adjusted.

In the load detection section of the above embodiment, two sets each of the detection switch 43, roller 43a, and cam 41a are provided, but for reasons such as elevator control, three or more sets may be installed. Of course it's a good thing.

Next, another embodiment of the load detecting section of the present invention will be described with reference to FIG. 70 is the bent portion 16 of the support beam 16
An L-shaped bracket is fixed to a, and 71 is a switch box with a built-in load detection switch 72.
A roller 72a of the detection switch 72 protrudes below. 73 is a detection rod, the upper part of which passes through the lower piece of the L-shaped bracket 70, and the upper end of which has a spring seat 7.
4 is fixed. 75 is L type bracket 70
This is a compression spring installed between the lower piece of the switch 72 and the spring seat 74, and always urges the detection rod 73 upward, but the force is set to a level that activates the detection switch 72 and does not destroy it. ing. In addition, a male thread is cut on the outer periphery of the lower part of the detection rod 73, and the detection plate 23
protrudes through the detection plate 2 by means of a nut 76.
3, the detection rod 73 is supported by the detection plate 23 against the force of the compression spring 75.

Next, the operation of this embodiment will be explained. When the car 2 becomes overloaded, the detection plate 23 rises as already explained. Along with this, the detection rod 73 is raised by the extension force of the compression spring 75, and the spring seat 74 pushes the roller 72a, thereby activating the detection switch 72. In addition, if the car collides with the hanging wheel 5 due to the car position detection device 13 not working, the main rope 3 may be damaged due to the rotation of the motor 9.
If it is overtensioned, the detection plate 23 will rise further, but when the spring seat 74 pushes the roller 72a, the detection rod 73 will not rise any further, and the detection plate 23 will only be released from the nut 76 and rise. Therefore, the detection switch 72 will not be destroyed.

According to this embodiment, since the load detection section is attached to the upper part of the support beam 16, installation and adjustment work can be easily performed as in the above-mentioned embodiment, and
Since the detection switch 72 is directly operated by the detection rod 73, the structure can be made more compact. Further, the distance between the spring seat 74 and the roller 72a can be adjusted by simply adjusting the position of the nut 76.

[Effect of idea]

As explained above, according to the present invention, the installation and adjustment work of the load detection section can be easily performed. In addition, the overtension/relaxation detection section does not generate vibration noise unlike conventional devices, and can operate reliably, with the advantage that installation and adjustment can be easily performed.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an embodiment of the present invention, Fig. 2 is a schematic sectional view taken along the - line in Fig. 1, Fig. 3 is a plan view of Fig. 1, and Fig. 4 is a load detection according to the present invention. FIG. 5 is a diagram showing the overall configuration of a conventional winding drum type elevator, and FIG.
7 is an enlarged view of the conventional safety device; FIG. 8 is a sectional view taken along the - line in FIG. 7;
FIG. 9 is a sectional view taken along the - line in FIG. 7. 1... Hoistway, 2... Car, 3... Main rope, 21... Rope socket, 22... Spring, 23... Detection plate, 24, 52, 73... Detection rod, 43, 72... Load Detection switch, 64...
Y-shaped lever, 65...overtension/relaxation detection switchbox, 66... cross-shaped lever.

Claims (1)

[Scope of utility model registration request] One end of the main rope is fixed to the rope socket,
In an elevator car that is suspended by the main rope via a spring attached to the rope socket and moves up and down in the hoistway, a detection plate fixed to the rope socket and a detection rod fixed to the detection plate are used. , a load detection switch that is activated by upward movement of this detection rod, a Y-shaped lever that rotates in conjunction with the up-and-down movement of the detection plate, and a Y-shaped lever that rotates by a predetermined or more rotational movement of the Y-shaped lever. An elevator safety device comprising a cross-shaped lever and an overtension/relaxation detection switch that is activated by the rotational movement of the cross-shaped lever.