JP4092930B2 - Brake device of driving device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a brake device according to, for example, an elevator drive device having 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. When the car 1 stops on the floor of the building, a normal brake provided on the motor is operated to keep the car 1 stationary. Reference numeral 50 denotes a grip device that restrains the main rope 3 in response to a command in an emergency.
[0007]
By the way, with such a mechanism, there is an advantage that if the pressing force of the belt 46 against the sheave 42 is sufficiently secured, there is no merit of slipping of the main rope 3, but when sufficient pressing force is not secured. Even if the brake of the motor is operating normally, the car may move at a low speed due to the influence of an unbalanced load, and a device that reliably stops and maintains the car is indispensable.
[0008]
The present invention has been made in view of the above points, and an object of the present invention is to provide, for example, a brake device according to an elevator apparatus that employs this new driving method.
[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 body is wound around a sheave and reciprocally moves in contact with an arc region of the tension member wound around the sheave. A brake device for pressing the belt is provided.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention constitutes a brake device having a mechanism for pressing a belt.
[0011]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an embodiment of a brake device according to the present invention. About this invention, it is a technique applicable naturally also to drive apparatuses other than an elevator apparatus.
[0012]
In the figure, the same reference numerals as those in FIGS. 2 and 3 denote the same components, but 60 is a brake device according to the present invention disposed above the sheave 42. The brake shoe 61 is moved upward by the action and maintains a predetermined clearance from the belt 46, but when the brake is applied, the electromagnetic action is lost, and as a result, the brake shoe 61 is moved by the spring pressure of the spring or the like. It is a device of a mechanism that directly presses 46 toward the sheave 42 from above.
[0013]
In the case of an elevator, while the car 1 is stopped on the floor, the roller 43 is stationary due to the normal brake of the motor, and the brake device 60 according to the present invention is operated, and the belt 46, the rope 3 and the sheave 42 Both are placed in a restrained state and the car 1 is stationary. The brake device 60 works every time the car 1 reaches the floor and reliably keeps the car 1 in a stopped state. Further, since the brake device 60 operates only when the car 1 is stopped, the belt 46 is not excessively damaged. Of course, this type of brake device 60 can be used not as an auxiliary brake but as a main brake device. That is, the brake on the motor side can be omitted.
[0014]
Next, FIG. 4 is a front view showing another embodiment of the present invention. This brake device 70 improves the braking ability by increasing the tension of the belt 46. That is, if the tension of the belt 46 is increased, the pressing force of the belt 46 against the rope 3 is increased, so that the braking ability is increased. However, if the belt tension is constantly increased, the fatigue life of the rotating portion is reduced, and the components become larger. Therefore, it is desirable to increase the belt tension only when stationary.
[0015]
In FIG. 4, an arm 71 is supported so as to be rotatable about a fulcrum 71a, and this arm 71 is provided with a roller 72. The roller 72 constantly presses the belt 46 downward by a spring 73. . While the car 1 is running, the arm 71 is pulled up by the electromagnetic coil 74 to release the brake so that the pressure from the roller 72 to the belt 46 is released, while the car 1 is stopped. Unwinds the power supply of the electromagnetic coil 74, and the roller 72 directly pushes the belt 46 by the spring force of the spring 73, so that tension is applied to the belt 46 and the braking performance is improved. In the case of this type of brake device, the brake is applied to the moving object together with the brake on the motor side as an auxiliary brake.
[0016]
In the above description, the brake device applied to the drive device installed in the vicinity of the sheave 43 around which the rope 3 is wound is described. However, the brake devices 60 and 70 are linear or curved at other points. It may be a brake device that works on a belt of shape. Further, the predetermined condition in which the brake device according to the present invention operates may be an emergency when the brake of the motor is operated, other than when the normal motor is stopped (when the car 1 is stopped). .
[0017]
【The invention's effect】
As described above, according to the present invention, since the brake works easily and appropriately, a very safe brake device of the drive device can be obtained.
[Brief description of the drawings]
FIG. 1 is a front view showing an example of a brake device according to the present invention.
FIG. 2 is an overall view of a conventional elevator apparatus.
3 is an overall perspective view of a new drive device 40. FIG.
FIG. 4 is a front view showing another embodiment of the present invention.
[Explanation of symbols]
1 Car 2 Counterweight 3 Main rope 42 Sheaves 43, 44, 45 Roller 46 Belt 60, 70 Brake device

Claims (6)

In 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 a belt that contacts the arc region of the tension member that is wound around the sheave is circulated by a motor.
A brake device for a drive device, comprising a brake device for pressing the belt. The brake device according to claim 1, wherein the brake device operates under a predetermined condition. The brake device for a drive device according to claim 2, wherein the predetermined condition is when the motor is stopped. 4. The brake device for a drive device according to claim 1, wherein the brake device is a device that directly presses the belt in the arc region toward the sheave. 5. The brake device for a drive device according to claim 1, wherein the brake device is a device for increasing the tension of the belt. 6. The brake device for a drive device according to claim 1, wherein the movable body is an elevator car.

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