JP2002362883A - Chain block with auxiliary motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that impact force in start up of auxiliary motor is large and large capacity battery is required due to high start up current and the auxiliary motor acts as resistance in hand wheel operation. SOLUTION: In a chain block transmitting rotation of the hand wheel 1 to a drive shaft 10 via a transmission mechanism and rotating a load sheave 11 via a reducing mechanism 13 rotatably installed on the drive shaft externally, the hand wheel 1 and the transmission mechanism are provided on one side of the load sheave 11, and the auxiliary motor 15 linking with the drive shaft 10 via an electromagnetic clutch 16 is provided on another side of the load sheave 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chain block with an auxiliary motor.

[0002]

2. Description of the Related Art Conventionally, as a chain block that can be used either manually or electrically, there is known a chain block in which an auxiliary power motor is connected via a planetary gear mechanism to a hand wheel on which a manual chain is suspended.

[0003] Hereinafter, a conventional chain block with auxiliary power will be described. In FIG. 5, 21 is a handwheel, 22 is a planetary gear mechanism, 23 is a load sheave, 24
Is a mechanical brake, 25 is a motor, 26 is a driving shaft,
27 is a sun gear, 28 is a planetary gear meshing with the sun gear 27, 29 is an internal gear meshing with the planetary gear, 30 is a casing, 31 is a manual chain, and 32 is a speed reducer for reducing the rotation of the load sheave.

In the above configuration, the planetary gear mechanism 22 is constituted by the sun gear 27, the planetary gear 28, and the internal gear 29. Further, the planetary gear 28 is mounted on the casing 30, and the motor 25 is provided on the side surface of the casing 30 and is connected to the handwheel 21 via the planetary gear 28 and the internal gear 29 by using the sun gear 27 as an input unit. A manual hoisting operation can be performed by a manual chain 31. By operating a push button to start a motor 25, a handwheel 21 is driven via a sun gear 27, a planetary gear 28, and an internal gear 29. Is rotated to enable electric hoisting.

[0005]

However, in the above conventional chain block with auxiliary power, the push button is turned on.
-Since the auxiliary motor is started by the OFF operation, the motor reaches the rated speed irrespective of the load, so a large impact force is applied to the power transmission member to which the power from the auxiliary motor is transmitted. In addition, the strength of the power transmission parts such as the planetary gear mechanism and the speed reducer must be strengthened, and when a battery is used as the power source, a large starting battery is required because the starting current is large and the power consumption is large. Furthermore, since the handwheel is directly connected to the motor, when the handwheel is manually rotated, the motor becomes a resistance to rotation, and a large force is required to rotationally drive the handwheel. There was a problem that.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and transmits the rotation of a handwheel to a drive shaft via a transmission mechanism and loads the rotation via a reduction mechanism rotatably mounted on the drive shaft. In the chain block that rotates the sheave, a torque response lever that operates according to the torque applied to the handwheel and an auxiliary motor that is linked to the drive shaft are provided, and the operation of the auxiliary motor is controlled by the operation of the torque response lever. This is a chain block with an auxiliary motor.

According to the present invention, the auxiliary motor is linked to the drive shaft, and when the handwheel is manually rotated, the auxiliary motor is disconnected from the drive shaft so that the auxiliary motor does not become a resistance when the handwheel is rotated. No special force is required to rotate the handwheel, and the hoisting work can be performed with the same force as a manual chain block without a motor. By driving the auxiliary motor by the response lever, the load at the time of winding can be reduced.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention transmits a rotation of a handwheel to a drive shaft via a transmission mechanism, and a load sheave via a reduction mechanism rotatably mounted on the drive shaft. In the chain block that rotates the motor, a torque response lever that operates according to the torque applied to the hand wheel and an auxiliary motor that is linked to the drive shaft are provided, and the operation of the auxiliary motor is controlled by the operation of the torque response lever. In the case where a high torque is applied to the handwheel, the auxiliary motor is driven by the torque response lever, so that the load at the time of winding can be reduced.

According to a second aspect of the present invention, a handwheel and a transmission mechanism are provided on one side of the load sheave, and an auxiliary motor linked to a drive shaft is provided on the other side. When the handwheel is manually rotated by linking the drive wheel with the drive shaft via an electromagnetic clutch, the auxiliary motor and the drive shaft can be disconnected, so that a special force is required to rotate the handwheel. This has the effect that the hoisting operation can be performed with the same force as that of the conventional manual chain block, without requiring the use of a conventional manual chain block.

According to a third aspect of the present invention, the transmission mechanism includes a carrier for transmitting the rotation to the output shaft of the handwheel, and a planetary gear mechanism having a sun gear for transmitting the torque of the handwheel. It is characterized by having a torque response lever transmitting to the detection means via the sun gear, and by driving the auxiliary motor by the instruction of the potentiometer, it is possible to keep the torque during manual winding constant. Since the auxiliary motor can be used to assist the manual operation, it has the effect of providing an energy-saving type chain block with an auxiliary motor that does not consume wasteful power.

According to a fourth aspect of the present invention, the torque response lever includes an adjusting spring for urging the sun gear in a counter-torque direction. It is characterized by rotating the gear against the spring urging force and rotating the torque response lever, and when the torque of the sun gear is more than a certain value applied to the handwheel, the sun gear resists the spring urging force. By rotating the sun gear and rotating the torque response lever following this rotation, the torque response lever and an adjustment spring that biases the torque response lever are automatically provided by an extremely simple configuration. This has the function of providing a chain block that operates the auxiliary motor in response to the torque.

The invention according to claim 5 is characterized in that the auxiliary motor is operated by variable voltage control or ON / OFF control by detecting the torque of the torque response lever, and the potentiometer or ON / OFF control is performed. When the OFF switch detects a torque equal to or more than a certain value, the auxiliary motor is operated by the above control method.

According to a sixth aspect of the present invention, the variable voltage control is a PWM control, wherein the motor rotates in a stepwise manner, and a large impact force is instantaneously applied to the power transmission portion. Therefore, the power transmission unit can be prevented from being damaged and the starting current can be reduced, so that a chain block that does not require a large-capacity battery can be provided.

According to a seventh aspect of the present invention, the auxiliary motor is linked to the drive shaft via an electromagnetic clutch. When the handwheel is manually rotated, the link between the auxiliary motor and the drive shaft is cut off. Therefore, the auxiliary motor does not become a resistance when the handwheel is rotated, and thus has an effect that the winding operation can be performed with the same force as that of a manual chain block without a motor.

An embodiment of the present invention will be described below with reference to the drawings.

[0016]

1 is a side view showing a chain block with an auxiliary motor according to the present invention, FIG. 2 is an enlarged front view showing a torque response lever, FIG. 3 is an exploded perspective view showing a planetary gear mechanism,
FIG. 4 is a system configuration diagram.

In the drawing, 1 is a handwheel, 1a is a support shaft fixed to a sun gear of a planetary gear mechanism, 2 is a planetary gear mechanism coupled to one side of the handwheel 1, and 2a is an internal gear of the planetary gear mechanism. The shaft, 2b is a planetary gear, 2c is a sun gear, 3 is a carrier, 3a is a power transmission unit provided on the carrier 3, 4 is coupled to the transmission unit 3a, and rotates following the rotation of the carrier of the planetary gear mechanism 2. Output shaft 5 and output shaft 4
And 6 a drive member connected to the shaft joint 5, 7 a brake plate, 8 a ratchet wheel, 9 a brake receiver, 10 a pinion shaft screw-connected to the brake receiver 9, 11 Is a load sheave, 12 is a load gear, 13 is a reduction gear meshing with the pinion shaft 10, and 14 is a reduction gear 13
Gears, which are provided on the shaft of
Is an auxiliary motor, 16 is an electromagnetic clutch, 16a is a speed reducer,
Reference numeral 17 denotes a torque response lever provided at the end of the support shaft 1a, reference numeral 17a denotes an operating portion of the torque response lever 17, reference numeral 18 denotes an adjusting spring which acts on the operating portion 17a of the torque response lever 17 to urge it in one direction, and 19 Is a stopper of the torque response lever 17, and 20 is a potentiometer.

The planetary gear mechanism 2 includes an internal gear 2a and an internal gear 2
a planetary gear 2b internally meshed with a, a sun gear 2c meshed with the planetary gear 2b, a carrier 3 which bears the planetary gear 2b and is rotated by the planetary gear 2b, and provided at the center of the carrier 3; A transmission unit 3 a such as a spline for transmitting the rotation of the motor 3 to the output shaft 4 is provided.

In the planetary gear mechanism of the present embodiment,
The internal gear 2a functions as an input unit, and the carrier 3 functions as an output unit. The sun gear 2c is urged in a counter-torque direction by an adjustment spring 18 to regulate rotation. When the load applied to the carrier 3 is smaller than the urging force applied to the sun gear 2c (at a low load), the rotation of the internal gear 2a is transmitted to the carrier 3 via the planetary gear mechanism 2b, and rotates the output shaft 4. . On the other hand, when a load greater than the urging force applied to the sun gear is applied to the carrier 3 (during high load), the carrier 3 does not rotate, and the sun gear 2c rotates against the urging force of the adjusting spring 18 to support the carrier. Torque response lever 1 via shaft 1a
7 is configured to rotate by a fixed amount.

Therefore, when the load is low, the handwheel 1
When the is manually rotated, the internal gear 2a of the planetary gear mechanism 2 fixedly coupled to one side of the handwheel 1 rotates, and the output shaft 4 rotates via the planetary gear 2b and the carrier 3.

When the output shaft 4 rotates, the driving member 6 rotates via the shaft coupling 5, the brake receiver 9 rotates via the brake plate 7 and the ratchet wheel 8, and the pinion screw-connected to the brake receiver 9. The shaft 10 is rotated. When the pinion shaft 10 rotates, the reduction gear 13 meshing with the pinion shaft 10 rotates, rotates the load gear 12 via the gear 14, and rotates the load sheave 11.

As described above, when the handwheel 1 is rotated, the planetary gear 2b meshing with the internal gear of the planetary gear mechanism 2
Rotates, but when a certain load is applied to the handwheel 1, the carrier 3 does not rotate and the sun gear 2c is moved by the adjusting spring 18c.
, And rotates the support shaft 1a fixed to the sun gear 2c. The support shaft 1a normally urges the sun gear 2c in a direction opposite to the rotation direction by the torque by the adjusting spring 18 via the torque response lever 17, and the sun gear 2c has a direction to cancel the rotation by the planetary gear 2b. Since the force acts, it does not rotate unless a torque exceeding a certain value is applied. The torque value for rotating the sun gear 2c is determined by the adjusting spring 18.

However, as described above, the handwheel 1
When a load equal to or more than a certain value is applied, the balance between the rotational torque of the planetary gears 2b and the sun gear 2c and the force of urging the sun gear 2c in the anti-rotational direction by the adjusting spring 18 is lost.
The sun gear 2c rotates against the urging force of the adjustment spring 19, rotates the torque response lever 17, and the torque is detected by the potentiometer 20 as the detecting means.

When the torque detected by the potentiometer 20 reaches a predetermined value, the controller operates the auxiliary motor 15 and the electromagnetic clutch 16. Auxiliary motor 1
5 is rotated by a pinion shaft 10, a reduction gear 13, a gear 1,
4. The power is transmitted to the load gear 12 to rotate the load sheave 11. When the load sheave 11 is rotated by the auxiliary motor 15 in this manner, the torque on the handwheel 1 side decreases, and at the same time, the operating portion 17 of the torque response lever 17
a is also retracted by the adjusting spring 18 to a position where it comes into contact with the stopper 19, so that the amount of torque detected by the potentiometer 20 changes, and the output of the auxiliary motor 15 decreases or stops.

As the detecting means, an ON / OFF switch may be used instead of the potentiometer. In this case, when the torque value of the handwheel reaches a certain value, the switch is turned on by the torque response lever, and the motor operates. And
When the handwheel torque decreases, the switch turns off.
It becomes F and the motor stops.

Next, the operation of the chain block according to the present embodiment will be described with reference to the system configuration diagram shown in FIG. First, when the handwheel 1 is manually rotated in the load lifting direction, the load sheave 11 is driven via the transmission mechanism and the speed reduction mechanism. When the torque of the handwheel 1 is applied to a certain value or more due to the load of the luggage, the torque response lever 17 is rotated via the sun gear, the torque is detected by the potentiometer, and the detected torque is more than the certain value. Operates the motor 15 by PWM control via the controller, and simultaneously operates the electromagnetic clutch 16 to
The load sheave 11 is driven via the reduction gear.

The motor control method is not limited to the PWM control as long as it is a variable voltage control corresponding to the potentiometer, and may be an ON / OFF control corresponding to an ON / OFF switch.

As described above, according to the present embodiment, the auxiliary motor is operated by the PWM control by the load applied to the handwheel, and an effective combination of the auxiliary power by the auxiliary motor and the handwheel operation by the manual force is achieved. A chain block can be provided, and the torque of the handwheel, which changes with the load, can be automatically detected and an auxiliary operation corresponding to the load can be applied.The auxiliary motor is connected to the motor only when auxiliary power is required. Therefore, the auxiliary motor does not become a resistance for driving the handwheel.

[0029]

According to the present invention, the auxiliary motor is linked to the drive shaft via the electromagnetic clutch. When the handwheel is manually rotated, the link between the auxiliary motor and the drive shaft is disconnected. , The auxiliary motor does not become a resistance to rotate the handwheel, and can perform the hoisting work with the same force as the conventional manual chain block,
Since the auxiliary motor is driven by the instruction of the potentiometer to keep the torque of the handwheel manually at a certain value or less, an energy-saving chain block can be provided, and the auxiliary motor is driven by PWM control. As a result, since a large impact force is not temporarily applied to the power transmission unit, damage to the power transmission unit can be prevented,
Furthermore, since the starting current is small, a chain block that does not require a large-capacity battery can be provided.

[Brief description of the drawings]

FIG. 1 is a side view showing a chain block with an auxiliary motor according to the present invention.

FIG. 2 is an enlarged front view showing a torque response lever unit.

FIG. 3 is an exploded perspective view showing a planetary gear mechanism.

FIG. 4 is a system configuration diagram.

FIG. 5 is a side view showing a conventional chain block with an auxiliary motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Handwheel 1a Support shaft 2 Planetary gear mechanism 2a Internal gear 2b Planetary gear 2c Sun gear 3 Carrier 3a Transmission part 4 Output shaft 5 Shaft coupling 6 Drive member 7 Brake plate 8 Claw wheel 9 Brake receiver 10 Pinion shaft 11 Load sheave 12 Load gear 13 Reduction Gear 14 Gear 15 Auxiliary Motor 16 Electromagnetic Clutch 16a Reducer 17 Torque Response Lever 17a Actuator 18 Adjusting Spring 19 Stopper 20 Potentiometer

Claims (7)

[Claims] 1. A chain block that transmits rotation of a handwheel to a drive shaft via a transmission mechanism and rotates a load sheave via a speed reduction mechanism rotatably mounted on the drive shaft, according to a torque applied to the handwheel. A chain block with an auxiliary motor, comprising: a torque responsive lever that operates by means of an auxiliary motor; and an auxiliary motor that is linked to a drive shaft, wherein the operation of the torque responsive lever controls the driving of the auxiliary motor. 2. The chain block with an auxiliary motor according to claim 1, wherein a handwheel and a transmission mechanism are provided on one side of the load sheave, and an auxiliary motor that is linked to a drive shaft is provided on the other side. 3. The transmission mechanism includes a carrier that transmits the rotation of the handwheel to an output shaft, and a planetary gear mechanism having a sun gear that transmits the torque of the handwheel, and detects the torque of the handwheel via the sun gear. 3. A torque response lever for transmitting to said means is provided.
Chain block with auxiliary motor as described. 4. The torque response lever includes an adjusting spring for urging the sun gear in a counter-torque direction, and when a torque equal to or more than a certain value is applied to the handwheel during manual winding, the sun gear resists the spring urging force. The chain block with an auxiliary motor according to claim 3, wherein the chain block rotates while rotating the torque response lever. 5. By detecting torque of a torque response lever,
The chain block with an auxiliary motor according to claim 3 or 4, wherein the auxiliary motor is operated by variable voltage control or ON / OFF control. 6. The chain block with an auxiliary motor according to claim 5, wherein the variable voltage control is PWM control. 7. The chain block with an auxiliary motor according to claim 1, wherein the auxiliary motor is linked to a drive shaft via an electromagnetic clutch.