JP4092929B2 - Drive device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a safety measure relating to, for example, an elevator drive device provided with a completely new drive mechanism.
[0002]
[Prior art]
As shown in FIG. 2, a conventional general elevator apparatus is a traction sheave driven by a car 1, its guide sheaves 11 and 12, a counterweight 2, its suspension sheave 21, and a driving device 4 in a hoistway 10. 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 tight side, μ: coefficient of friction between the traction sheave 5 and the main rope 5, 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 instead of the main rope 3 is also considered, but the above problem cannot be solved.
Further, in the conventional traction sheave type, it is necessary to drive the traction sheave that supports the car 1 and the counterweight 2, 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 an elevator apparatus equipped with a completely new drive mechanism as follows. Detailed contents of this elevator apparatus are described in International Application Patent No. PCT / JP02 / 01220 filed on February 14, 2002.
[0006]
That is, FIG. 3 is a perspective view showing the entire new drive device.
2, the same reference numerals as those in FIG. 2 denote the same components, but the driving device 40 is housed in a frame 41 disposed so as to surround the sheave 42 around which the main rope 3 is wound, and the belt 46 is It is wound around three pulleys 43, 44, and 45 so as to cover the top of the sheave 42 and press the main rope 3 against the sheave 42 from above. A motor (not shown) is connected to the pulley 43 and is driven to rotate, and the sheave 42 and the main rope 3 are moved together through the circulation motion of the belt 46 to raise and lower the car 1. Reference numeral 50 denotes a grip device that restrains the main rope 3 in response to a command.
[0007]
By the way, with such a mechanism, if the pressing force of the belt 46 against the sheave 42 is sufficiently ensured, there is an advantage that the main rope 3 can be completely prevented from slipping. Care must be taken not to fall off.
[0008]
The present invention has been made in view of the above points, and an object of the present invention is to provide a safety measure related to a drive device (for example, an elevator device) adopting this new drive system.
[0009]
[Means for Solving the Problems]
The present invention relates to a drive device having a belt in which a rope or belt-like tension member that supports a moving object is wound around a sheave and reciprocally moves in contact with an arc region of the tension member wound around the sheave.
1. The sheave is provided with a rising portion on at least a part of the outer periphery so that the contact portion between the tension member and the belt is hidden.
2. A holding member that contacts at least a part of the anti-sheave surface of the arc region of the belt is provided in the fixing portion of the driving device.
3. The movement preventing member is disposed on the anti-sheave surface of the arc region of the belt or the side surface of the belt with a gap at the fixed portion of the driving device.
Is.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention appropriately takes safety measures against sheaves.
[0011]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing an example of a sheave safety measure according to the present invention, and FIG. 4 is a view taken along line AA in FIG.
[0012]
In the figure, the same reference numerals as those in FIGS. 2 and 3 denote the same components, but reference numeral 60 denotes a sheave according to the present invention, in order to prevent the belt 46, which is always tensioned on both sides, from falling off. The rim 61 has a height that hides the contact portion between the rope 3 and the belt 46, for example, a rim 61 is provided over the entire outer periphery of the sheave 60 (partially spaced at an appropriate interval). 61 includes openings 61a, for example, at predetermined intervals (or at diagonal positions). The state of the belt 46 can be confirmed at any time directly from the opening 61a.
[0013]
With respect to the rim 61, as shown in FIG. 5, a member 62 (equivalent to a rising member, a rotating body, etc.) different from the sheave 60 may be attached to the entire outer periphery of the sheave 60, or partially. An appropriate interval may be provided. When the rim 61 or the separate member 62 is partially arranged, it is not necessary to provide an opening.
[0014]
The belt 46 is originally provided with a groove in contact with the main rope 3 so that it is difficult to move horizontally. In this way, a rising portion of a necessary size or shape at a necessary position at both ends of the sheave 60 is obtained. If the belts 46 are provided, there is no possibility that the belt 46 falls off the sheave 60.
[0015]
Further, the fixing portion (for example, the frame 41) of the driving device 40 is in contact with at least a part of the anti-sheave surface of the circular arc region (the region in contact with the main rope 3) of the belt 46 (may be over the entire region) For example, the object of the present invention can be achieved by arranging a pressing member of a rotating body such as a roller. It is desirable that the pressing member be configured to be removable or movable because the belt 46 can be easily replaced.
[0016]
Furthermore, it may be configured as shown in FIG. That is, the movement preventing member 63 (for example, a smooth sliding member or roller) is provided at a fixed portion of the driving device 40 with a gap over at least a part or the entire region of the anti-sheave surface and belt side surface of the arc region of the belt 46. A similar object can be achieved even if a rotating body such as
[0017]
In either case, it is naturally difficult for the car 1 to fall off and be dragged by an unbalanced load and the car 1 to fall freely.
[0018]
【The invention's effect】
As described above, according to the present invention, safety measures can be sufficiently taken for the new type of driving device by belt driving, and the reliability of the device can be greatly improved.
[Brief description of the drawings]
FIG. 1 is a sectional view of a sheave showing an example of a safety measure according to the present invention.
FIG. 2 is an overall view of a conventional elevator apparatus.
FIG. 3 is an example of an overall view of a new drive type elevator.
4 is a view taken along the line AA in FIG.
FIG. 5 is a sectional view showing a second example of the safety measure according to the present invention.
FIG. 6 is a cross-sectional view showing another example of the safety measure according to the present invention.
[Explanation of symbols]
1 Car 2 Counterweight 3 Main rope 4, 5, 6, 40, 60 Sheave 46 Belt 61 Rib 61a of sheave 60 Opening 62 of rim 61 Separate member 63 Movement prevention member

Claims (13)

In a driving device having a belt that is wound around a sheave with a rope or belt-like tension member that supports a moving body, and that reciprocates in contact with an arc region of the tension member wound around the sheave.
The drive device characterized in that the sheave is provided with a rising portion so that a contact portion between the tension member and the belt is hidden at least at a part of the outer periphery. The drive device according to claim 1, wherein the rising portion is a rim. The driving device according to claim 2, wherein the rim is provided at predetermined intervals. The driving device according to claim 2, wherein the rim is provided on the entire outer periphery of the sheave. The drive device according to claim 4, wherein the rim includes an opening. The drive device according to claim 5, wherein a plurality of the openings are provided at an appropriate interval. The drive device according to claim 1, wherein the rising member is a member different from the sheave. The drive device according to claim 7, wherein the separate member is a rotating body. In a driving device having a belt that is wound around a sheave with a rope or belt-like tension member that supports a moving body, and that reciprocates in contact with an arc region of the tension member wound around the sheave.
The driving device according to claim 1, wherein the fixing portion of the driving device is provided with a pressing member that contacts at least a part of the anti-sheave surface of the arc region of the belt. The drive device according to claim 9, wherein the pressing member is a rotating body. In a driving device having a belt that is wound around a sheave with a rope or belt-like tension member that supports a moving body, and that reciprocates in contact with an arc region of the tension member wound around the sheave.
The driving device according to claim 1, wherein a movement preventing member is disposed at a fixed portion of the driving device with a gap on an anti-sheave surface or a side surface of the belt in an arc region of the belt. The drive device according to claim 11, wherein the movement blocking member is a rotating body. The said to-be-moved body is the elevator car, The claim 1, 2 or 3, The claim 4, The claim 5, The claim 6, The claim 7, or The claim 8 or Claim The drive device according to claim 9 or claim 10 or claim 11 or claim 12.

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