JP4123797B2 - Reciprocating body drive device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a device for reciprocatingly driving a reciprocating body without using a traction sheave, for example, an elevator device, and more particularly to a detection device for detecting a rotating state of a sheave that is rotated by a driving force of a driving device. It is.
[0002]
[Prior art]
As shown in FIG. 5, a conventional general elevator apparatus includes a car 1 in a hoistway 10, guide sheaves 11 and 12, a counterweight 2, a suspension sheave 21, and a traction sheave driven by a drive device 4. 5 and the like, and the main rope 3 in which the rope ends 31 and 32 are fixed to the fixed side of the hoistway is stretched through the sheaves 21, 5, 11, and 12. Reference numeral 13 is a landing door, 14 is a beam on which the driving device 5 is installed, 15 is a guide rail for the counterweight 2, and the guide rail for the car 1 is not shown.
[0003]
[Problems to be solved by the invention]
Since the conventional apparatus rotates the traction sheave 5 to move the car 1 up and down, the main rope 3 needs to move according to the rotation of the traction sheave 5 without causing the main rope 3 to slip with respect to the traction sheave 5. Therefore, there is a problem that it is difficult to reduce the weight of the car 1.
That is, as is conventionally known, in order to prevent the traction sheave 5 and the main rope 3 from slipping, it is necessary to satisfy the following Aitel wine equation.
T2 / T1 ≦ exp (μ · θ)
Here, T1: tension on the loose side, T2: tension on the tension side, μ: coefficient of friction between the traction sheave 5 and the main rope 3, and θ: a winding angle of the main rope 3 around the traction sheave 5.
[0004]
For example, if the weight of the car 1 is 1500 kg, the loading capacity is 1000 kg, and the counterweight overbalance is 50%, the above equation is obtained when the loading amount is 0 and when the loading is full.
T2 / T1 = 2000/1500 = 1.33
T2 / T1 = 2500/2000 = 1.25
Here, when the weight of the car 1 is reduced to 1000 kg, the above equations are as follows.
T2 / T1 = 1500/1000 = 1.5
T2 / T1 = 2000/1500 = 1.33
As described above, the left side (T2 / T1) of the mathematical formula varies greatly depending on the weight of the car 1 and the load load. In particular, since this value increases with the weight reduction of the car 1, there is a limit to the weight reduction of the car 1.
An elevator using a belt-like member in place of the main rope 3 is also considered, but the above problem cannot be solved.
Furthermore, in the conventional traction sheave type, it is necessary to support the weight of the car 1 and the counterweight 2 with the traction sheave, so that the driving device needs a large torque output, and there is a problem that the motor and the like are enlarged. .
[0005]
For this reason, the applicant has recently proposed a device equipped with a completely new drive mechanism as follows. The detailed contents of this device are described in International Application No. PCT / JP02 / 01220.
[0006]
That is, as shown in FIG. 6, the drive device 40 attaches a sheave 42 to a frame 41 and arranges pulleys 43, 44, 45 at three locations above and on both sides of the sheave 42, and these pulleys 43, 44, A belt 46 is stretched around 45, and the main rope 3 wound around the sheave 42 is pressed against the sheave 42 by the belt 46. The upper pulley 43 is connected to a motor (not shown) attached to the back surface of the frame 41, and is configured to move the sheave 42 and the main rope 3 to move the car 1 up and down by the circumferential movement of the belt 46. Yes. The pulleys 44 and 45 on both sides are attached to the frame 41 by the position adjusting mechanism 47 so that the height position can be adjusted. By adjusting the height position, the tension of the belt 46 can be adjusted. Can do. 48 is a rope gripper that holds the main rope 3 in an emergency or the like, and 49 is a detection device that detects the rotating state of the motor, for example, a rotary encoder.
[0007]
Since this configuration does not use a traction sheave, if the pressing force of the belt 46 against the main rope 3 is ensured, the main rope 3 can be prevented from slipping even if the weight of the car 1 is reduced. Further, since the load on the car 1 etc. is borne by the sheave 42, there is an effect that the motor can be miniaturized.
[0008]
By the way, in the drive device configured as described above, in order to realize accurate and smooth control in consideration of the slight slip of the main rope 3 and the belt 46, it is necessary to detect the rotational state of the sheave 42 together with the rotational state of the motor. is there. Therefore, it is necessary to install a detection device such as a rotary encoder that detects the rotational state of the sheave 42, but sufficient examination has not been made as to how it should be arranged.
The present invention provides an installation method of the detection device for detecting the rotation state of the sheave 42 according to the installation status of an elevator or the like in the above drive device.
[0009]
[Means for Solving the Problems]
The present invention drives a belt by a belt transmission mechanism that revolves along a main rope that reciprocally drives a reciprocating moving body by pressing an arc region of the main rope or the like wound around the sheave toward the sheave. The apparatus includes a detection device that detects a rotation state of the sheave.
[0010]
According to the present invention, in the above-described configuration, the detection device is arranged on the rim portion of the sheave.
Furthermore, the present invention provides a bracket having a structure in which the sheave rotates around a fixed shaft in the above configuration, and a bracket is provided from the sheave to the center of rotation to detect the rotation state of the bracket. Thus, the rotational state of the sheave is detected.
Furthermore, according to the present invention, in the above configuration, when the sheave rotates with its shaft, a detection device is incorporated in the boss portion of the sheave. Alternatively, a recess is provided in the shaft of the sheave, and the detection device is arranged so that a part of the detection device enters the recess.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIG. This figure is a schematic view corresponding to the central longitudinal section of FIG. 6, in which the sheave 42 rotates around the shaft 50 fixed to the frame 41. A detecting device 51 for detecting the rotational state of the sheave 42, for example, a rotary encoder, is arranged on the rim portion near the circumference of the sheave 42.
If it is this structure, since the detection apparatus 51 exists inside the hoistway of the sheave 42, there exists an effect that a maintenance becomes easy.
[0012]
FIG. 2 is a view showing another embodiment of the present invention, in which a bracket 52 toward the rotation center of the sheave 42, that is, the center of the shaft 50 is fixed to the sheave 42. The rotation center side of the bracket 52 is formed so as to be parallel to the central axis of the shaft 50, and the detection device 51 is arranged in this portion.
With this configuration, the maintenance of the detection device 51 becomes easy as in the case of FIG. Further, in the case of FIG. 1, if dust or oil adheres to the rim portion of the sheave 42, the detection accuracy of the detection device 51 may be reduced. The accuracy can be prevented from decreasing.
[0013]
FIG. 3 is a view showing another embodiment of the present invention, and is an example in which the shaft 50 is integrated with the sheave 42. And the detection apparatus 51 is arrange | positioned in the boss | hub part of the sheave 42 (it is the same also if expressed as the boss | hub part of the shaft 50).
With this configuration, the detection device 51 can be arranged in a space below the motor 60, so that space is saved.
[0014]
FIG. 4 is a view showing another embodiment of the present invention. The shaft 50 is integrally formed with the sheave 42, and a recess 53 is formed in the center of the shaft 50, and a part of the detection device 51 is in the recess 53. It is arranged so as to enter.
With this configuration, since a part of the detection device 51 enters the shaft 50, the length in the left-right direction in FIG. 4 can be shortened. Therefore, it is advantageous when installing on a site where space is limited.
[0015]
As described above, the installation position of the detection device 51 can be selected according to the situation of the site such as the space, shape, and maintenance situation of the hoistway where the elevator is installed.
[0016]
In the above embodiment, the main rope 3 is used, but in recent years, elevators using a belt-like tension member instead of the rope have also appeared. However, the present invention can be similarly applied to a rope-like tension member or a belt-like tension member.
In the above embodiment, the driving device 40 is installed in the upper part of the hoistway. However, if the main rope or the like extends below the sheave, it can be installed in the middle or lower part of the hoistway. Furthermore, the drive device 40 of the above embodiment can be installed upside down, or can be installed so that the main rope and the like extend in the lateral direction by rotating 90 degrees. Furthermore, in the case of an elevator having a machine room, it can be installed in the machine room.
[0017]
Furthermore, the reciprocating body drive device according to the present invention is applied not only to the above-described lifting and lowering type elevator device, but also to a horizontal movement type elevator device, an elevator device having a car on both sides, a cable car, a ropeway, and the like. be able to.
[0018]
【The invention's effect】
As described above, according to the present invention, since a traction sheave is not used, the weight of a car or the like can be reduced, and the motor can be reduced in capacity. Further, there is an effect that the installation location of the sheave rotation state detecting device can be selected according to the condition of the hoistway and the like.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of the present invention.
FIG. 2 is a diagram showing another embodiment of the present invention.
FIG. 3 is a diagram showing another embodiment of the present invention.
FIG. 4 is a diagram showing another embodiment of the present invention.
FIG. 5 is a diagram showing an example of a conventional elevator.
FIG. 6 shows a drive device according to the invention.
[Explanation of symbols]
1 Car 2 Counterweight 3 Main rope 40 Driving device 42 Sheaves 43, 44, 45 Pulley 46 Belts 49, 51 Device 50 for detecting rotation state Shaft 52 Bracket

Claims (6)

In what drives a rope-like or belt-like tension member for reciprocatingly driving a reciprocating moving body by a driving device,
The has a sieve tension member is wrapped, the belt revolves belt transmission mechanism, the arc sections of the tension member which is wound around the sheave without a structure for driving and pushing toward the sheave, the A reciprocating body drive device provided with a detection device for detecting the rotational state of the sheave. The reciprocating body drive device according to claim 1, wherein the detection device is disposed on a rim portion of the sheave. The sheave rotates around a fixed shaft, a bracket is provided from the sheave to the center of rotation, and the detection device detects the rotation state of the bracket by detecting the rotation state of the bracket. The reciprocating body driving device according to claim 1, wherein the reciprocating body driving device is configured to detect. The reciprocating body drive device according to claim 1, wherein the sheave rotates with its shaft, and the detection device is incorporated in a boss portion of the sheave. The sheave rotates with its shaft, the shaft of the sheave is provided with a recess, and the detection device is arranged so that a part of the detection device enters the recess. 2. A reciprocating body drive device according to 1. 6. The reciprocating body driving device according to claim 1, wherein the reciprocating body is an elevator car.

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