JP4891022B2 - Chain block with auxiliary motor - Google Patents

Description

  The present invention relates to a chain block with an auxiliary motor provided with an auxiliary motor for reducing a load when lifting a load in a chain block for lifting and lowering the load.

  Conventionally, when moving loads that are difficult to lift directly by manpower at factories and construction sites, the rotation of the handwheel is transmitted to the load wheel via the speed reducer and the load chain hung on the load wheel. A chain block that lifts and lowers the load was used. Especially in the case of heavy loads, it may be difficult to lift the chain block by simply operating it manually. With an auxiliary motor equipped with a removable auxiliary motor that assists the rotation of the chain block handwheel. A chain block has been proposed (see, for example, Patent Document 1).

  In such a normal chain block with an auxiliary motor, like the chain block 1 shown in FIG. 4, a load lifting hook 11, a load chain 12, a load wheel 13, a mounting hook 14, a speed reducer 15, a hand chain 16, a hand wheel 17 is provided.

  The chain block 1 is suspended from a ceiling or a beam by a mounting hook 14. The luggage to be moved is attached to the luggage lifting hook 11 directly or with a rope or the like. The handwheel 16 is pulled to rotate the hand wheel 17, and the load wheel 13 is rotated via the speed reducer 15. Depending on the direction of rotation of the load wheel 13, the load chain 12 is wound or lowered, and the load lifting hook 11 is raised or lowered to move the load.

In particular, when lifting a heavy load, the drive shaft 4 of the auxiliary motor 3 is inserted into the mounting hole 2 provided in the hand wheel 17. As the hand chain 16 is pulled, the auxiliary motor 3 is driven in the same rotational direction as the hand wheel 17, thereby reducing the load generated on the hand wheel 17.
Japanese Patent Laid-Open No. 2004-026498

  However, when lifting a load with a chain block with an auxiliary motor as shown in Patent Document 1, the rotation speed of the motor is constant, and it is assisted by a larger force than necessary, or there is not enough assisting force. The operability is bad.

  Further, when the load is relatively light and can be raised at high speed only by human power, the speed at which the chain is hoisted by human power may be faster than the rotation speed of the auxiliary motor. At this time, a load opposite to the direction in which the handwheel rotates is generated in the handwheel by the auxiliary motor, increasing the load on the hand.

  The present invention has been made to solve such a problem, and provides a chain block with an auxiliary motor that assists rotation of the hand wheel in accordance with the magnitude of a load generated on the hand wheel in the chain block with an auxiliary motor. With the goal.

For the present invention, to attain the aforementioned object, by driving the auxiliary motor connected to a hand wheel Ji Enburokku in chain block having a mechanism to reduce the load during lifting luggage, the at lifting luggage Hand It includes a torque detection mechanism for detecting the load caused to the wheel, and a control unit for controlling rotation of the auxiliary motor according to the magnitude of the detected load by the torque detection mechanism, the torque detection mechanism, the hand An outer rotating shaft attached to the foil; an inner rotating shaft which is provided inside the outer rotating shaft in the same direction as the outer rotating shaft; and a spring which connects the outer rotating shaft and the inner rotating shaft. And a slide resistance that is provided on the inner rotary shaft, and a bar for changing a resistance value is moved by a guide pin provided on the outer rotary shaft. It is characterized in that there.

According to the present invention, when the handwheel is pulled to rotate the handwheel to lift the load, the load generated on the handwheel is detected by the torque detection mechanism. The rotation speed of the auxiliary motor is controlled by the control device based on the magnitude of the load generated in the handwheel detected by the torque detection mechanism.

  As a result, it is possible to assist the load generated when the load is lifted according to the magnitude of the load, and an unnecessary load is not generated on the hand wheel, and the load can be lifted quickly and with a slight force. .

According to the present invention, the torque detection mechanism includes an outer rotation shaft attached to the hand wheel, an inner rotation shaft provided inside the outer rotation shaft in the same direction as the outer rotation shaft, and an outer rotation shaft. A rotation angle between the outer rotation shaft and the inner rotation shaft is achieved by a spring connected to the inner rotation shaft and a bar that is provided on the inner rotation shaft and changes a resistance value by a guide pin provided on the outer rotation shaft. And slide resistance for detecting the difference between the two.

  When the hand chain is pulled in the direction of lifting the load, the hand wheel starts rotating, and the outer rotating shaft rotates accordingly. At that time, since the inner rotating shaft remains in place, a difference in rotation angle is generated between the outer rotating shaft and the inner rotating shaft. As a result, the slide resistance lever guided by the guide pin provided on the outer rotating shaft moves, and the resistance value of the slide resistance increases. The control unit rotates the auxiliary motor based on the magnitude of the resistance value, and assists the rotation of the handwheel so that there is no difference in the rotation angle between the inner rotation shaft and the outer rotation shaft.

  As a result, it is possible to assist the load generated when the load is lifted according to the magnitude of the load, and an unnecessary load is not generated on the hand wheel, and the load can be lifted quickly and with a slight force. .

The present invention is characterized in that the value of the load applied to the handwheel detected by the torque detection mechanism is sent to the control device via a slip ring.

According to the present invention, the change in the resistance value according to the load generated in the handwheel detected by the rotating torque detection mechanism can be sent to the control device via the slip ring.

In the present invention, when the shaft connected to the auxiliary motor is rotated between the auxiliary motor and the hand wheel, the shaft connected to the hand wheel is rotated, and the shaft connected to the hand wheel is rotated. A reverse input preventing clutch that does not rotate the shaft connected to the auxiliary motor when rotated is provided.

According to the present invention, a load caused by a delay in the rotation of the auxiliary motor, which occurs when the rotation speed of the handwheel is higher than the maximum rotation speed of the auxiliary motor, is not transmitted to the handwheel side by the reverse input prevention clutch.

  Thereby, an unnecessary load is not generated on the hand wheel, and the load can be lifted quickly and with a slight force.

  As described above, according to the chain block with an auxiliary motor of the present invention, an unnecessary load is not generated on the handwheel, and the load can be lifted quickly and with a slight force.

  Hereinafter, preferred embodiments of a chain block with an auxiliary motor according to the present invention will be described in detail with reference to the accompanying drawings.

  First, the configuration of the chain block with an auxiliary motor according to the present invention will be described. FIG. 1 is a configuration diagram of a chain block with an auxiliary motor according to the present invention.

  As shown in FIG. 1, the chain block 10 includes a load lifting hook 11, a load chain 12, a load wheel 13, a mounting hook 14, a speed reducer 15, a hand chain 16, a hand wheel 17, a torque detection mechanism 18, and a one-way clutch 19. An electromagnetic clutch 20, an auxiliary motor 21, a control device 22, and a battery 23.

  As with the chain block 1 shown in FIG. 4, the chain block 10 attaches a load to the load lifting hook 11, pulls the hand chain 16, rotates the hand wheel 17, and moves the load. When the load is moved, the torque detection mechanism 18 detects a load generated on the hand wheel 17 due to the load of the load.

  As shown in FIG. 2, the torque detection mechanism 18 includes an outer rotation shaft 31, an inner rotation shaft 32, a slide resistance 33, a bar 34, a guide pin 35, a spring 36, and a stopper 37. The outer rotation shaft 31 is a hand. The inner rotary shaft 32 is attached to the rotary shaft A shown in FIG.

  The inner rotating shaft 32 is provided inside the outer rotating shaft 31 so as to be rotatable in the same direction as the outer rotating shaft 31, and the inner rotating shaft 32 and the outer rotating shaft 31 are connected by a spring 36. A slide resistor 33 is provided on the inner rotary shaft 32, and the bar 34 of the slide resistor 33 is moved left and right by a guide pin 35 provided on the outer rotary shaft 31.

  As shown in FIG. 2B, when the outer rotating shaft 31 rotates, the inner rotating shaft 32 stays in place, and the bar 34 moves by the guide pin 35 and the resistance value of the slide resistance 33 increases. . The resistance value is sent to the control device 22 via a slip ring (not shown). If the resistance value has increased, the auxiliary motor 21 is rotated in accordance with the magnitude of the resistance value, and the electromagnetic clutch 20 is locked to assist. The rotational force of the motor 21 is transmitted to the hand wheel 17.

  The auxiliary motor 21 and the hand wheel 17 are connected by a one-way clutch 19 as a rotational force transmitting means. The one-way clutch 19 can transmit rotational force only in one direction, is connected to the handwheel 17 via the torque detection mechanism 18 by the drive shaft A, and is connected to the auxiliary motor via the electromagnetic clutch 20 by the drive shaft B. 21 is connected.

  The one-way clutch 19 is locked when the rotational force in the direction opposite to the rotational direction of the auxiliary motor 21 is generated on the drive shaft A side, and transmits the rotational force of the auxiliary motor 21 to the handwheel 17 side. When a rotational force in the same direction as the rotation direction of the auxiliary motor 21 is generated on the drive shaft A side, the lock is released and idling starts.

  The battery 23 supplies electric power to the torque detection mechanism 18, the electromagnetic clutch 20, and the auxiliary motor 21 via the control device 22.

  With these configurations, the chain block 10 with an auxiliary motor according to the present invention does not cause an unnecessary load on the hand wheel 17, quickly lifts the load with a slight force, and quickly when necessary while the auxiliary motor 21 is operating. You can lift your luggage.

  Next, the operation of the chain block with an auxiliary motor according to the present invention will be described. As shown in FIG. 1, the rotation of the hand wheel 17 is transmitted to the load wheel 13 via the speed reducer 15, and the load lifting hook 11 moves up or down to move the load.

  The load applied to the hand wheel 17 when the hand wheel 17 is rotated in the direction of lifting the load is detected by the torque detection mechanism 18. When the hand wheel 17 starts rotating in the direction of raising the load and the resistance value of the slide resistance 33 shown in FIG. 2 increases, the electromagnetic clutch 20 is locked, and the auxiliary motor 21 is PWM-controlled according to the magnitude of the resistance value and the hand is moved. Start rotating in the same direction as the foil 17.

  The rotational force of the auxiliary motor 21 is transmitted to the handwheel 17 through the one-way clutch 19. At this time, when the load generated on the hand wheel 17 is large and the rotation speed of the hand wheel 17 is slower than the maximum rotation speed of the auxiliary motor 21, the rotation of the drive shaft A is delayed from the rotation of the drive shaft B. On the A side, a rotational force in the direction opposite to the rotational direction of the auxiliary motor 21 is generated. As a result, the one-way clutch 19 is locked, and the drive shaft A and the drive shaft B rotate at the same speed in the same rotation direction, and the rotational force of the auxiliary motor 21 is transmitted to the handwheel 17.

  When the load generated on the hand wheel 17 is small and the rotation speed of the hand wheel 17 is higher than the maximum rotation speed of the auxiliary motor 21, a load for rotating the auxiliary motor 21 at the maximum speed or more is generated on the hand wheel 17. .

  However, since the rotation of the drive shaft A is faster than the rotation of the drive shaft B, a rotational force in the same direction as the rotation direction of the auxiliary motor 21 is generated on the drive shaft A side of the one-way clutch 19. As a result, the lock of the one-way clutch 19 is released, the one-way clutch 19 is idled, and the handwheel 17 rotates at a speed faster than the maximum rotation speed of the auxiliary motor 21 without being affected by the load from the auxiliary motor 21. Can be maintained.

  Further, when the handwheel 17 is rotated in the direction of lowering the load, the resistance value of the slide resistance 33 does not increase, so that the electromagnetic clutch 20 is unlocked and the high speed is not affected by the load from the auxiliary motor 21. The handwheel 17 can be rotated to lower the load.

  By these actions, the chain block with an auxiliary motor of the present invention does not cause an unnecessary load on the hand wheel 17, and can quickly lift the load with a slight force.

  Next, the configuration of a chain block with an auxiliary motor according to another embodiment of the present invention will be described. FIG. 3 is a configuration diagram of a chain block with an auxiliary motor according to another embodiment of the present invention.

  As with the chain block 10 shown in FIG. 1, the chain block 40 attaches a load to the load lifting hook 11, rotates the hand wheel 17 to move the load, and the load generated on the hand wheel 17 due to the load of the load is large. This is detected as an increase in resistance value using the torque detection mechanism 18.

  The increase in the resistance value due to the detected load is sent from the slip ring 41 to a control device (not shown). When the resistance value increases, the auxiliary motor 44 driven by the battery 45 is rotated in accordance with the magnitude of the resistance value, and the rotational force of the auxiliary motor 44 is transmitted via the speed reducer 45 and the reverse input prevention clutch 42. It is transmitted to the hand wheel 17. As a result, the load generated on the handwheel 17 is reduced.

  When the shaft on the auxiliary motor 44 side is rotated, the reverse input preventing clutch 42 is transmitted with a rotational force and the shaft on the handwheel 17 side rotates. However, when the shaft on the handwheel 17 side is rotated, the rotational force is not transmitted and the shaft on the auxiliary motor 44 side is not rotated. As the reverse input prevention clutch 42, for example, a torque diode manufactured by NTN Corporation can be suitably used.

  Next, the operation of the chain block with an auxiliary motor according to another embodiment of the present invention will be described.

  As shown in FIG. 3, the chain block 40 detects the load applied to the handwheel 17 by the torque detection mechanism 18 and rotates the auxiliary motor 44 by PWM control according to the load to reduce the load applied to the handwheel 17. To do.

  The rotational force of the auxiliary motor 44 is transmitted to the handwheel 17 via the reverse input prevention clutch 42, and when the rotational speed of the handwheel 17 is slower than the maximum rotational speed of the auxiliary motor 44, the rotational force of the auxiliary motor 44 is the handwheel 17. The load applied to the hand wheel 17 is reduced.

  When the rotation speed of the hand wheel 17 exceeds the maximum rotation speed of the auxiliary motor 44, the rotation of the shaft on the auxiliary motor 44 side of the reverse input prevention clutch 42 is delayed from the axis on the hand wheel 17 side. This is equivalent to the state where the reverse input preventing clutch 42 is rotated from the shaft. At this time, the reverse input preventing clutch 42 has a structure in which the shaft on the auxiliary motor 44 side does not rotate even if the shaft on the hand wheel 17 side is rotated, so that the hand wheel 17 is affected by the load from the auxiliary motor 44. Maintains high rotation speed without any problems.

  When the handwheel 17 is rotated in the direction in which the load is lowered, the load is not detected by the torque detection mechanism 18 and the auxiliary motor 44 does not rotate. At this time, since the shaft on the auxiliary motor 44 side of the reverse input prevention clutch 42 is stopped, the reverse input prevention clutch 42 is rotated from the shaft on the handwheel 17 side. Therefore, only the shaft on the hand wheel 17 side rotates, and the load from the auxiliary motor 44 is not transmitted to the hand wheel 17, and the hand wheel 17 can be rotated at high speed.

  As described above, the chain block with an auxiliary motor according to the present invention reduces the load with the auxiliary motor when the load of the load is large, and an unnecessary load is not generated on the hand wheel. You can lift your luggage.

  In addition, when you want to quickly lift the load by rotating the handwheel at high speed, such as when there is no load or when the load on the load is small, it is possible to increase the speed quickly without being affected by the load from the motor. Become.

The block diagram of the chain block with an auxiliary motor which concerns on this invention. The top view which showed the structure and operation | movement of the torque detection mechanism. The block diagram of the chain block with an auxiliary motor of another embodiment. The block diagram of a normal chain block with an auxiliary motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 10, 40 ... Chain block, 2 ... Mounting hole, 3, 21, 44 ... Auxiliary motor, 4, A, B ... Drive shaft, 11 ... Luggage lifting hook, 12 ... Load chain, 13 ... Road wheel, 14 ... Mounting hook, 15, 43 ... reducer, 16 ... hand chain, 17 ... hand wheel, 18 ... torque detection mechanism, 19 ... one-way clutch, 20 ... electromagnetic clutch, 22 ... control device, 23, 45 ... battery, 42 ... reverse Input prevention clutch

Claims (3)

In the chain block with a mechanism that reduces the load when lifting the load by driving the auxiliary motor connected to the handwheel of the chain block,
A torque detection mechanism for detecting a load generated in the handwheel when lifting a load;
And a control unit for controlling rotation of the auxiliary motor according to the magnitude of the detected load by the torque detection mechanism,
The torque detection mechanism includes an outer rotating shaft attached to the hand wheel,
An inner rotating shaft provided inside the outer rotating shaft so as to be rotatable in the same direction as the outer rotating shaft;
A spring connecting the outer rotating shaft and the inner rotating shaft;
A chain block with an auxiliary motor, characterized in that a bar that is provided on the inner rotating shaft and a bar for changing a resistance value is moved by a guide pin provided on the outer rotating shaft . The chain block with an auxiliary motor according to claim 1, wherein a value of a load applied to the handwheel detected by the torque detection mechanism is sent to the control device via a slip ring. When the axis connected to the auxiliary motor rotates between the auxiliary motor and the hand wheel, the axis connected to the hand wheel rotates, and the axis connected to the hand wheel rotates. The chain block with an auxiliary motor according to claim 1 or 2, further comprising a reverse input preventing clutch that does not rotate a shaft connected to the auxiliary motor.

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