JPS6234931Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a cable reel that can freely accelerate and decelerate at a constant torque.

Prior art and its problems Conventionally, as shown in Fig. 4, this type of cable reel rotates a winding drum for winding the cable by a torque motor via a reduction gear. cooling fan motor,
It is constructed by adding an electromagnetic brake, a slip ring, etc. Therefore, there are a large number of component parts, and there are structural problems such as inability to wind up due to insufficient torque of the torque motor, slack in the cable, burnt out of the motor, damage to the reducer key, broken chain, overheating of the motor due to lack of ventilation, etc. There are drawbacks that can cause problems.

Means for Solving the Problems The present invention was developed in view of this, and uses a linear motor as the source of rotation of the winding drum, and uses the unique non-contact thrust of the motor to replace the conventional speed reducer. The torque can be directly converted into rotational torque from the side of the winding drum without any intervention, causing the winding drum to rotate, and the torque can be freely changed by changing the distance from the center of the winding drum axis to the linear motor. The present invention provides a cable reel that can freely accelerate/decelerate at a constant torque and is movable to maintain a constant balance with cable tension.

Embodiments The present invention will be described below based on illustrated embodiments.

In the figure, reference numeral 1 denotes a cable having a required diameter and length. One end of the shaft of a winding drum 2 for winding the cable 1 is supported by a bearing support box 3, and a slip ring 4 is attached to the support box 3. In addition, a brake device 5 is provided at the outer end of the support box 3, and the winding drum 2, etc.
The bearing support box 3, slip ring 4, and brake device 5 constitute a winding section, and on the opposite side of the winding drum 2, a winding drive section is constructed.

The slip ring 4 in this embodiment is used when the cable 1 is required to be energized while being taken up or unwound by the take-up drum 2, for example, when the present cable reel is used in place of the power supply trolley wire for traveling when an overhead crane is traveling. etc., but it is not necessary when simply used for winding and unwinding the cable.

This winding drive section is provided opposite to the side drum flange 10 of the winding drum 2, and is used for transversely feeding the primary stator 6 forming a linear motor to the linear slider base 12 via bearings 13, 13. A linear slider 9 rotatably supports a ball screw 8, and a linear slider 9 having a primary stator 6 fixed thereon opposite to the drum flange 10 on the side of the winding drum is screwed onto the ball screw 8. A bevel gear 7a is fixed to the shaft, and a bevel gear 7b provided at the end of a shaft protruding from the winding drum 2 is engaged with the bevel gear 7a. It is something that is established.

The primary stator 6 forms a linear motor together with a secondary movable element 10 (to be described later), and as is well known, consists of a stator core and a winding portion wound around the stator core. A thrust is given to the secondary movable element 10 by excitation of the winding portion.

A predetermined gap is provided between the primary stator 6 of the linear motor and one side of the winding drum 2, that is, the outer side of the drive drum flange 10.
In addition, the drum flange 10 on the driving section side of the winding drum 2
This is a known type of plywood made of aluminum and an iron plate on the primary side stator side in order to act as a secondary side mover of a linear motor, and thrust is generated by excitation of the primary side winding part. Obtain drum flange 1
0, that is, the winding drum 2 is rotated.

In the cable reel constructed as described above, when winding up a long cable, the winding drum 2 requires a large rotational torque due to the weight of the cable 1. In this case, the linear motor is located at position B in FIG. 3, that is, at a position where a large rotational torque can be obtained, and the rotational torque is set to be slightly larger than the torque on the cable side. Then gradually cable 1
is wound up on the winding drum 2, the winding drum 2
A bevel gear 7b fixed to a shaft end protruding from the shaft and a bevel gear 7a meshing with the bevel gear 7b rotate. As a result, the ball screw 8 to which the bevel gear 7a is fixed also rotates, and the linear slider 9 screwed onto the ball screw 8, and therefore the primary stator 6 of the linear motor fixed to the linear slider 9, rotates. Take drum 2
It moves from the position on the outer circumferential side B toward the inner circumferential side B according to the number of rotations.

As the torque due to the cable's own weight decreases, the position of the linear motor also moves from the outer peripheral side B of the drum to the inner peripheral side A, so as to maintain a balance with the torque on the cable side.

In this way, the linear motor is shifted from A to B or from B to A in accordance with the lift (length of the cable), and the torque is changed by changing the position of the linear motor to change the torque due to the tension of the cable's own weight. This always keeps the drum rotation torque constant relative to the cable tension. In the case of rewinding, the operation is reversed to that described above, and detailed explanation thereof will be omitted.

The rotation speed of the winding drum and the lateral feed rate of the linear motor driven by the ball screw in the above are set by the gear ratio of the bevel gear rotation direction converter, and the linear motor position, which varies depending on the type of lift and cable, is set by the linear slider. It can be easily adjusted by moving it.

Note that the lateral direction feeding mechanism of the linear motor is not limited to the embodiment, and may be any mechanism as long as it can follow the rotation of the winding drum. Furthermore, the present invention is not limited to cables, but can also be applied to general long objects.

Effects of the invention According to the present invention, (1) A power reduction device is not required, and the structure becomes simple.

(2) Acceleration/deceleration by adjusting the applied voltage and frequency;
Torque adjustment can be freely selected.

(3) The winding rotation torque commensurate with the cable tension can always be kept constant.

(4) Fewer worn parts, easy maintenance.

(5) Excessive torque on the driven side can be handled by magnetic force, acting as a shock absorber.

It has the following advantages.

[Brief explanation of the drawing]

FIG. 1 is a front view, FIG. 2 is a plan view, FIG. 3 is a side view, and FIG. 4 is a diagram of a known embodiment. DESCRIPTION OF SYMBOLS 1... Cable, 2... Winding drum, 3... Bearing support box, 4... Slip ring, 5... Brake device, 6... Primary side stator of linear motor, 7
a, 7b...Bevel gear, 8...Ball screw, 9...
Linear slider, 10...Drum flange (secondary side mover of linear motor), 11...Ball screw nut, 12...Linear slider base, 13...
…bearing.

Claims (1)

[Scope of utility model registration request] A drive side drum flange of a winding drum equipped with a brake device and supported by a support box is used as a secondary side mover, and a primary side stator is opposed to the drive side of the drum flange with a predetermined gap therebetween. The secondary side movable element and the primary side stator together form a linear motor, and the drum flange moves between the outer circumferential part and the inner circumferential part of the drum flange in accordance with the rotation of the winding drum. A cable reel in which the primary stator of the linear motor is movably mounted on a ball screw.