JP2017114614A - Apparatus and method for protecting manual hoisting machine with electric auxiliary motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and method for protecting a manual hoisting machine with an electric auxiliary motor in which the weight of a load lifted and lowered can accurately be detected with a simple structure, and the over-hoisting operation of the weight greater than the product rating, the over-speed operation of the speed greater than the product rated speed and the over-work-rate operation more than the product rating total work-rate can be prevented.SOLUTION: An apparatus for protecting a manual hoisting machine with an electric auxiliary motor is provided. Control means (200) stops the rotary support of a load sheave (2) by an electric auxiliary motor (9) when a rotational speed (N) exceeds an allowable upper limit rotation speed, and when a weight value of a load L exceeds a predetermined allowable upper limit weight value. The control means calculates a work rate when not exceeding it, and when the work rate is not beyond an allowable upper limit work rate, the support is executed by an electric motor at a predetermined support rate. When the work rate exceeds the allowable upper limit work rate, the support rate is decreased until it becomes lower than the allowable upper limit work rate, and then the support is executed at a predetermined support rate.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a manual hoisting machine with an electric auxiliary motor equipped with an electric auxiliary motor, because the manual hoisting machine is broken or damaged due to the breakdown, damage, or excessive wear of the manual hoisting machine and the life is shortened. The present invention relates to a protection device and a protection method.

  Conventionally, in a factory or a construction site, there is a manual hoisting machine that is operated with a hand-drawing force when moving a heavy load that is difficult to lift directly by human power. Such a manual hoisting machine rotates a hand wheel by operating a hand pulling member (wire rope or chain) hung on the hand wheel (manual wheel) with a hand pulling force, and this rotational force is applied to a road wheel ( The load suspension member (wire rope or chain) hung on the road wheel is moved in the vertical direction (winding / lowering direction). Thereby, the load suspended by the load suspension member is moved in the vertical direction. In such a manual hoisting machine, when handling a heavy load that cannot be moved by the operation of the hand pulling force, an electric auxiliary motor for assisting the rotation of the handwheel or the road wheel is provided. A manual hoisting machine with an electric auxiliary motor (manual chain block or the like) that assists the rotation of the handwheel by operating the electric auxiliary motor has been proposed (see, for example, Patent Documents 1 and 2). Hereinafter, a manual chain block will be described as a representative example of a manual hoisting machine.

JP 2002-36283 A JP 2009-220953 A

  As will be described in detail later, the manual chain block with an electric auxiliary motor is composed of parts such as a hand wheel, a load sheave, a speed reduction mechanism, and a brake mechanism, and a mechanical mechanism. Since these parts and mechanical mechanisms each have a limit in durability, a product rating (allowable upper limit) is provided to limit the weight of the load handled as a chain block. If a load that exceeds the product rating is lifted (moved), the mechanical mechanisms constituting the manual chain block may be damaged or worn, causing problems such as reduced safety and reduced life of the manual chain block. Occur. In particular, in manual chain blocks with electric auxiliary motors, the electric auxiliary motors assist (support) the rotational force of the handwheel and road wheel. There is a problem in that there is a possibility that operation at a speed exceeding the rated speed and operation at a power exceeding the product rated total power may be performed.

  In addition, in a hoisting machine such as a manual chain block with an electric auxiliary motor, the weight of the load to be lifted is borne by the operator's hand-drawing force and the rotational force of the electric auxiliary motor. It has been difficult to detect easily and accurately, and it has been difficult to construct a protective device that can detect the weight of a suspended load with high accuracy and perform an appropriate protective function.

  The present invention has been made in view of the above, and can accurately detect the weight of a load to be lifted and lowered with a simple configuration, over-winding operation with a weight exceeding the product rating, over-speed operation exceeding the product rated speed, product rated total work It is an object of the present invention to provide a protection device and a protection method for a manual hoisting machine with an electric auxiliary motor capable of preventing an overwork rate operation exceeding the rate.

  In order to solve the above-mentioned problems, the present invention includes a drive wheel on which a load suspension member for hanging a load is hung, a manual wheel on which a guide member is hung, and an electric auxiliary motor that supports rotation of the drive wheel. The rotational force of the manual wheel generated by hand-drawing the hand-drawing member is transmitted to the drive wheel via the drive shaft, and the load suspended by the load-suspending member is lifted and lowered, and the load at the time of lifting the load is also reduced. When the weight is greater than or equal to a predetermined value, a manual hoisting machine with an electric auxiliary motor that supports the rotation of the driving wheel by supplying a predetermined driving current from the motor driver to the electric auxiliary motor by controlling the control means to operate the electric auxiliary motor A rotation speed sensor for detecting the rotation speed of the electric auxiliary motor and a weight detection means for detecting the weight of the load, and the control means detects the detected rotation speed detected by the rotation speed detection sensor. Allowed When the upper limit rotational speed is exceeded or the detected weight value detected by the weight detection means exceeds the predetermined allowable upper limit weight value, the assistance by the electric auxiliary motor is limited, and the detected rotational speed exceeds the allowable upper limit rotational speed. If the detected weight value does not exceed the allowable upper limit weight value, the power is calculated, and if the calculated calculated power does not exceed the allowable upper power limit, the electric assist motor uses a predetermined support rate. On the other hand, if the calculated work rate exceeds the allowable upper limit work rate, the support rate by the electric auxiliary motor is decreased until the calculated auxiliary work rate falls below the allowable upper limit work rate, and then the electric motor is supported at the predetermined support rate. A protective device for a manual hoisting machine with an electric auxiliary motor is provided.

  Further, the present invention provides a protection device for a manual hoisting machine with an electric auxiliary motor, comprising: a rotational force sensor that detects the rotational force of the manual wheel; and a current sensor that detects an electric current to be supplied to the electric auxiliary motor. The control means detects the weight of the load from the detected rotational force detected by the rotational force sensor and the detected current detected by the current sensor.

  The present invention also includes a drive wheel on which a load suspension member that suspends a load is hung, a manual wheel on which a guide member is hung, and an electric auxiliary motor that supports rotation of the drive wheel. The rotational force of the manual wheel generated by the hand is transmitted to the drive wheel via the drive shaft, the load suspended by the load suspension member is lifted and lowered, and the weight of the load at the time of lifting the load exceeds a predetermined value In this case, a protection device for a manual hoisting machine with an electric auxiliary motor that drives the electric auxiliary motor by supplying a predetermined driving current from the motor driver to the electric auxiliary motor under the control of the control means and supports the rotation of the drive wheel. And the control means includes, in the relationship between the rotational speed of the electric auxiliary motor and the weight of the load, a non-supporting area in which the assistance by the electric auxiliary motor is invalidated, a support having area in which the assistance by the electric auxiliary motor is valid, support An assist rate reduction region for reducing the support rate surrounded by the region and the support-provided region is set, and the control means is predetermined when the operating state of the manual hoisting machine with the electric auxiliary motor is in the support-supported region. If the driving state is in the non-support region, the support by the electric auxiliary motor is stopped, and if the driving state is in the support rate decrease region, the driving state is supported. Provided is a protection device for a manual hoisting machine with a motor-assisted motor, characterized in that the support rate is reduced until the region is reached, and support is provided by the motor-assisted motor at a predetermined support rate when the region with support is reached.

  The present invention also provides a protection device for a manual hoisting machine with an electric auxiliary motor, wherein the rotational force sensor detects the rotational force of the manual wheel, the current sensor detects the electric current supplied to the electric auxiliary motor, and the electric auxiliary motor. The control means captures the detected rotational force detected by the rotational force sensor, the detected current detected by the current sensor, and the detected rotational speed detected by the rotational speed sensor. The control by the electric auxiliary motor is controlled.

  The present invention also includes a drive wheel on which a load suspension member that suspends a load is hung, a manual wheel on which a guide member is hung, and an electric auxiliary motor that supports rotation of the drive wheel. The rotational force of the manual wheel generated by the hand is transmitted to the drive wheel via the drive shaft, the load suspended by the load suspension member is lifted and lowered, and the weight of the load at the time of lifting the load exceeds a predetermined value In this case, a method for protecting a manual hoisting machine with an electric auxiliary motor that supplies a predetermined driving current from the motor driver to the electric auxiliary motor under the control of the control means to operate the electric auxiliary motor and assists the rotation of the driving wheel. If the rotation speed of the electric auxiliary motor exceeds the allowable upper limit rotation speed or the weight of the load exceeds the specified product rated weight, the support by the electric auxiliary motor is limited and the rotation speed exceeds the allowable upper limit rotation speed. If the weight does not exceed the rated product weight, the work rate is calculated. If the calculated work rate does not exceed the allowable upper limit work rate, support is provided by the electric auxiliary motor at a predetermined support rate. If the calculated work rate exceeds the allowable upper limit work rate, the support rate by the electric auxiliary motor is reduced until it falls below the allowable upper limit work rate. A method of protecting a manual hoisting machine with an electric auxiliary motor is provided.

  The present invention also includes a drive wheel on which a load suspension member that suspends a load is hung, a manual wheel on which a guide member is hung, and an electric auxiliary motor that supports rotation of the drive wheel. The rotational force of the manual wheel generated by the hand is transmitted to the drive wheel via the drive shaft, the load suspended by the load suspension member is lifted and lowered, and the weight of the load at the time of lifting the load exceeds a predetermined value In this case, a method for protecting a manual hoisting machine with an electric auxiliary motor that supplies a predetermined driving current from the motor driver to the electric auxiliary motor under the control of the control means to operate the electric auxiliary motor and assists the rotation of the driving wheel. In the control means, in the relationship between the rotation speed of the electric auxiliary motor and the weight of the load, a non-support area where the assistance by the electric auxiliary motor is invalidated, and a support area where the assistance by the electric auxiliary motor is valid, The branch A support rate reduction area that reduces the support rate surrounded by the non-region and the support-provided region is set, and when the operating state of the manual hoisting machine with the electric auxiliary motor is in the support-provided region, a predetermined support rate If the driving state is in the non-supporting region, the support by the electric auxiliary motor is stopped, and if the driving state is in the support rate reduction region, the driving state is supported until the driving state becomes the supporting region. Provided is a method for protecting a manual hoisting machine with an electric auxiliary motor, wherein the electric auxiliary motor is supported at a predetermined support rate when the rate is reduced and the support-equipped region is reached.

  According to the present invention, when the rotational speed detected by the rotational speed detection sensor exceeds the allowable upper limit rotational speed, the support is stopped by the electric auxiliary motor, and the weight value detected by the weight detection means is the predetermined allowable upper limit. When the weight value is exceeded, the assistance is stopped by the electric auxiliary motor, and when the detected weight value does not exceed the allowable upper limit weight value, the power is calculated, and the calculated power exceeds the allowable upper limit power. If not, perform support by the electric motor at a predetermined support rate, and if the calculated work rate exceeds the allowable upper limit work rate, decrease the support rate by the electric auxiliary motor until it falls below the allowable upper limit work rate. Since the support by the electric motor is performed at the predetermined support rate, the product life can be maintained without excessively improving the performance of the manual hoisting machine with the electric auxiliary motor.

  In addition, according to the present invention, the non-support area where the assistance by the electric assist motor is invalidated, the support area where the support by the electric assist motor is valid, and the support rate surrounded by the non-support area and the support area And the control means performs support by the electric assist motor at a predetermined assist rate when the operating state of the manual hoisting machine with the electric assist motor is in the assist-provided region. If the driving state is in the non-support region, the support by the electric auxiliary motor is stopped, and if the driving state is in the support rate reduction region, the support rate is decreased until the driving state becomes the support region. Since the electric assist motor is assisted at a predetermined support rate, the product life can be maintained, stable use within the product rating can be performed, and operation without a sense of incongruity can be performed.

It is a block diagram which shows the schematic system configuration | structure of the protection apparatus of the manual winding machine with an electric auxiliary motor which concerns on this invention. It is a figure which shows the processing flow of the protection process of the protection apparatus of the manual winding machine with an electric auxiliary motor which concerns on this invention. It is a figure which shows the protection setting range of the protection apparatus of the manual winding machine with an electric auxiliary motor which concerns on this invention. It is a figure which shows the processing flow of the protection process of the protection apparatus of the manual winding machine with an electric auxiliary motor which concerns on this invention. It is side sectional drawing which shows the schematic structural example of the manual chain block with an electric auxiliary motor using the protection apparatus which concerns on this invention. FIG. 6 is a side cross-sectional view showing the configuration of the case body side of the handwheel of the manual chain block with an electric auxiliary motor of FIG. 5.

  Hereinafter, embodiments of the present invention will be described in detail. In this embodiment, a chain block will be described as an example of the hoisting machine. However, the manual hoisting machine with the electric auxiliary motor according to the present invention is not limited to the chain block. Of course, a manual hoisting machine using a wire rope or the like as the hanging member may be used.

  FIG. 1 is a block diagram showing a schematic system configuration of a protection device of a manual hoisting machine with an electric auxiliary motor (manual chain block 1 with an electric auxiliary motor) according to the present invention. As shown in the figure, a drive shaft 5 to which a hand wheel 3 that is a manual wheel is coupled is connected to a load sheave 2 via a speed reduction mechanism 4, and a hand chain C 2 that is a guide member that engages with the hand wheel 3 is applied with a hand pulling force. , The rotational force is transmitted to the load sheave 2 through the drive shaft 5 and the speed reduction mechanism 4. The load sheave 2 is engaged with a load chain C1 which is a load suspension member. When the load sheave 2 rotates, the load sheave 2 moves in the upward (winding) or downward (lowering) direction, The load L suspended on the load chain C1 moves up and down. A brake mechanism 6 brakes the rotation of the drive shaft 5. Here, the speed reduction mechanism 4 is not essential, and in some cases, the drive shaft 5 may be directly connected to the load sheave 2 without passing through the speed reduction mechanism 4.

A rotating shaft of the electric auxiliary motor 9 is connected to the drive shaft 5 through a coupling portion J. The electric auxiliary motor 9 is an electric motor such as a DC brushless motor that is driven to rotate by obtaining drive power (AC power) from a motor driver 8 having an inverter. Reference numeral 17 denotes a rotational speed sensor that detects the rotational speed of the electric auxiliary motor 9, 18 denotes a motor current sensor that detects a current supplied from the motor driver 8 to the electric auxiliary motor 9, and 7 denotes a rotational force (rotational torque) of the handwheel 3. This is a torque sensor that detects. The detection outputs N ₉ , I ₉ , and T ₇ of the rotation speed sensor 17, the motor current sensor 18, and the torque sensor 7 are input to the control unit 200. The motor driver 8 includes an inverter, and converts DC power from the storage battery Bt or AC power from an AC power source (for example, AC 50 Hz, 100 V power source) (not shown) into AC power having a predetermined frequency under the control of the control unit 200. The AC power is supplied as drive power from the motor driver 8 to the electric auxiliary motor 9 to operate the electric auxiliary motor 9.

As will be described in detail later, the control unit 200 has a protection function for the manual chain block 1 with the electric auxiliary motor. Control unit 200, the detection outputs I _9, T ₇ from the motor current sensor 18 and the torque sensor 7, calculates the weight of the load L, as described later, the electric auxiliary when the calculated weight value is equal to or greater than a predetermined A support component current _IA9 to be supplied to the motor 9 is calculated, and the support component current is supplied to the electric auxiliary motor 9. As a result, torque corresponding to a predetermined ratio of the weight value of the load L is generated from the electric auxiliary motor 9 to assist (support) the rotation of the handwheel 3. Or it calculates the rotational force of the hand wheel 3 from the detection output T ₇ of the torque sensor 7 supplies a support component current I _A9 for generating torque corresponding to a predetermined percentage of the torque to the electric auxiliary motor 9, the electric auxiliary motor 9 assists the rotational force of the handwheel 3. As a result, the hand pulling force of the hand chain C2 of the operator who operates the manual chain block 1 is reduced, and the operator can raise (wind) the load L that is many times the weight with a relatively small hand pulling force.

  As described above, the manual chain block 1 with the electric auxiliary motor includes the load sheave 2, the hand wheel 3, the speed reduction mechanism 4, the drive shaft 5, the brake mechanism 6, the bearings B1 to B9 described later, and the like. Each has a limited life and durability. Therefore, the allowable upper limit value of the weight of the load L to be wound up from the viewpoint of maintaining the safety and product life of the manual chain block 1 with the electric auxiliary motor, and the electric auxiliary motor 9. The allowable upper limit of the rotation speed and the allowable upper limit of the total power are specified as product ratings. In particular, in order to support the pulling force of the hand chain C2 by the rotational force of the electric auxiliary motor 9, the lifting operation of the load L exceeding the weight value of the product rating (allowable upper limit) and the rotating speed exceeding the allowable upper limit value are performed. There is a high risk of operation exceeding the total work rate of the allowable upper limit value, which may cause damage or failure of the parts and mechanisms that make up the manual chain block 1 with electric auxiliary motor, threatening safety, and in turn product There is a problem of shortening the lifetime.

  In order to solve this problem, a weight sensor that directly detects the weight of the load L that is raised and lowered to a predetermined part of the manual chain block is provided, and the weight detection output of the weight sensor is input to the control unit 200. When the weight exceeds the predetermined product rating weight value, the drive current supplied to the electric auxiliary motor 9 is cut off, and the operation of the electric auxiliary motor 9 is stopped. As a result, the load L is wound only by the pulling force of the hand chain C2, so that it is virtually impossible to wind the load L exceeding the weight value of this product rating. However, the method of providing a weight sensor for directly detecting the weight of the load L in this way requires that a weight sensor for directly detecting the weight of the load L be provided at any predetermined part of the manual chain block 1. There is also a problem in selecting a sensor installation site for using a sensor of such a system or in which position the sensor is installed. In some cases, there is a problem that a large modification of the manual chain block is required. Therefore, in the present embodiment, a method of easily detecting the weight of the load L only by changing the software of the control unit 200 even in an existing manual chain block with an electric auxiliary motor will be described.

In the manual chain block with the electric auxiliary motor, the handwheel 3 is connected to the drive shaft 5, and the rotational force of the handwheel 3 is transmitted to the drive shaft 5. The rotating shaft of the electric auxiliary motor 9 is also connected to the driving shaft 5 through the coupling portion J, and the rotational force is transmitted to the driving shaft 5. While the drive shaft 5 is rotating in the winding direction, if the weight of the load L is M and the radius of the load sheave 2 is r,
M · r = (hand-drawing rotational force (rotational torque) of the handwheel 3) + (rotational force (rotational torque) of the electric auxiliary motor 9)
It becomes. The hand-drawing rotational force of the handwheel 3 is K ₁ · T ₇ when the detection output of the torque sensor 7 is T ₇ . Electric auxiliary rotational force of the motor 9 becomes K ₂ · I ₉ when the motor current detected by the motor current sensor 18 and I _9,
M · r = K ₁ · T ₇ + K ₂ · I ₉
It becomes. Where K _{1 is a} proportional constant (a constant for converting the detection output T ₇ of the torque sensor 7 into a rotational force), K _{2 is a} proportional constant (a constant for converting the motor current I into a rotational force, and considering the reduction ratio and mechanical efficiency) And obtained from experiments). Since the hand-drawing rotational force of the hand wheel 3 changes from moment to moment, the motor current I ₉ of the electric auxiliary motor ₉ also changes accordingly.

Here, the support rate for the weight M of the load L by the electric auxiliary motor 9 is expressed as K ₃ (0 ≦ K ₃ ≦ 1) (K ₃ = 0 is when the electric auxiliary motor 9 does not support rotational force, and K ₃ = 1 is electric If the auxiliary current is _IA9 , the support load Wa is as follows:
Wa = K ₃ · M = K ₃ · (K ₁ · T ₇ + K ₂ · I ₉ ) / r = K ₂ · I _A9 / r
Thus, the support current _IA9 of the electric auxiliary motor 9 is
I _A9 = Wa · r / K ₂ = (K ₃ / K ₂ ) · (K ₁ · T ₇ + K ₂ · I ₉ ) · r
It becomes.

As described above, the motor current I ₉ to the electric auxiliary motor 9 detected by the motor current sensor 18 and the detection output T ₇ detected by the torque sensor ₇ are input to the control unit 200 every moment. The control unit 200 performs the above calculation to instantaneously calculate the support current _IA9 of the electric auxiliary motor 9 so that the current supplied to the electric auxiliary motor 9 via the motor driver 8 becomes the support current _IA9. Are controlled so that the rotational force of the electric auxiliary motor 9 becomes the support load Wa. That is, a rotational force corresponding to a certain ratio (support rate K ₃ ) of the weight M of the load L is output from the electric auxiliary motor 9. For this reason, a motor current sensor 18 for detecting a current supplied from the motor driver 8 to the electric auxiliary motor 9 is provided, and the detected motor current I ₉ is input to the control unit 200, and the control unit 200 receives the electric auxiliary from the motor driver 8. The motor driver 8 is controlled so that the current supplied to the motor 9 becomes the support _divided current I _A9 = (K ₃ / K ₂ ) · (K ₁ · T ₇ + K ₂ · I ₉ ) · r.

In the manual chain block with the electric auxiliary motor, the weight M of the load L at the time of winding is
Paying attention to the total of the rotational force of the electric auxiliary motor 9 due to the support current _IA9 and the rotational force of the handwheel 3 due to the pulling force of the hand chain C2, the following formula is calculated to calculate the weight M of the load L: calculate.
M = (K ₁ · T ₇ + K ₂ · I _A9 ) / r
The control unit 200, the electric auxiliary and weight values M _S product rating of motorized manual chain block 1 is stored, the control unit 200 calculates the weight M of the load L perform the above calculation, the calculated weight When the value of M exceeds the weight value M _S of the product rating (M ≧ M _S ), the motor driver 8 is controlled to cut off the current supplied from the motor driver 8 to the electric auxiliary motor 9 to thereby cut the electric auxiliary motor 9. Stop supporting. As a result, the load L is wound only by the rotational force of the handwheel 3 by the hand pulling force of the hand chain C2, and the load L cannot be effectively wound.

As described above, when the value of the weight M of the load L exceeds the weight value M _S of the product rating by the control unit 200 (M ≧ M _S ), the support of the electric auxiliary motor 9 is stopped, whereby the electric auxiliary motor manual chain block 1 attached is not to be operated beyond the weight values M _S product rating. Thereby, it is possible to prevent the safety and product life of the manual chain block from being impaired. The torque sensor 7 for detecting the rotational force of the hand wheel 3, the motor current sensor 18 and the control unit 200 for detecting the motor current I ₉ is, in the electric auxiliary motor with manual chain block 1 of this kind usually equipped Has been. Further, since the control unit 200 normally includes a microcomputer, the overload prevention device can cope with the problem by changing the software of the control unit 200. Therefore, it is not necessary to provide a special weight measuring means for measuring the weight M of the load L. Therefore, it is possible to easily equip the existing manual chain block 1 with an electric auxiliary motor.

In the electric assist motor with a manual chain block 1, to support the rotational force of the hand wheel 3 by the electric assist motor 9 and to reduce the guide force of hand chain C2 by the operator, the weight value M _S of the predetermined rated value In addition to the excessive weight hoisting exceeding, an overspeed hoisting operation exceeding a predetermined product rated hoisting speed and an overpower hoisting operation exceeding a predetermined product rated power are problematic. Therefore, the weight M of the load L is calculated as described above, and the support by the electric auxiliary motor 9 is stopped when the calculated weight M exceeds the weight value M _S of a predetermined product rating (M ≧ M _S ). In addition, the manual chain block 1 is protected by further suppressing overspeed hoisting operation and overwork rate hoisting operation. The specific control method is as follows.

Even if the weight value M _S of the predetermined product rating is not exceeded, the work rate w with respect to the weight M calculated above using the rotational speed N ₉ of the electric auxiliary motor 9 detected by the rotational speed sensor 17 and the mechanical efficiency η is expressed by the following equation: Calculate with
w = M · N ₉ / η
When the calculated work rate w is less than the product rated work rate (allowable upper limit work rate) w _S (w <w _S ), normal assistance by the electric auxiliary motor 9, that is, preset assistance for the weight M of the load L Supporting current _IA9 is supplied to the electric auxiliary motor 9 so as to achieve a rate (assist rate). Further, even when the calculated work rate w exceeds the product rated work rate (allowable upper limit work rate) w _S (w> w _S ), as described later, if the calculated work rate w is in the “assist rate reduction” region, the weight M The support rate (assist rate) of the electric auxiliary motor 9 is decreased to guide the operation state of the manual chain block 1 to the “assisted” region, and the electric auxiliary motor 9 continues the support.

  Further, in the hoisting operation of the load L, even when the rotational speed of the electric auxiliary motor 9 exceeds a predetermined allowable upper limit rotational speed, each component and mechanism constituting the manual chain block 1 may be damaged or broken as described above. Therefore, even when the allowable upper limit rotational speed is exceeded, the assistance (assist) by the electric auxiliary motor 9 is limited. Here, the concept of restriction of assistance (assist) not only stops assistance, but also reduces assistance (decreases the assistance rate) or applies a negative assistance, that is, a load to the hand chain pulling force. This assistance shall be included.

FIG. 2 is a diagram showing a processing flow of the protection function considering the work rate w as described above. This process is performed by the computer of the control unit 200. First, the control unit 200 calculates the weight M of the load L (M = (K ₁ · T ₇ + K ₂ · I ₉ ) / r) (step ST1). If there the calculated weight M is in determining whether products rated weight value (allowable upper weight value) M _S or (step ST2), products rated weight value M _S or (Y), assisted by the electric assist motor 9 Is stopped (the assist current _IA9 supplied from the motor driver 8 to the electric auxiliary motor 9 is cut off and the assist is stopped) (step ST3). In the above step ST2, the weight M performs calculation of a After work rate w in less than rated value weight value _{M S (N) (w =} 9.8 · M · N 9 · / η) ( step ST4), followed by It is determined whether or not the calculated work rate w is equal to or higher than the product rated power rate w _S (step ST5). If the calculated work rate w is equal to or higher than the product rated power rate w _S (Y), a decrease in the support rate by the electric auxiliary motor 9 (assist (Step ST6), and the operation state of the manual chain block 1 is guided to the “assisted” region as will be described in detail later, and the operation is continued. In step ST5, the electric auxiliary calculated work rate w is less than rated value work rate w _S normal assist if there in (N), i.e. the calculated load given support rate set to the weight M of L (assist ratio) The motor 9 is operated to perform normal support (step ST7).

FIG. 3 is a diagram showing characteristics of a manual chain block with an electric auxiliary motor. In the figure, the horizontal axis represents the weight M (t) of the load L, and the vertical axis represents the rotational speed N ₉ (rotational speed) of the electric auxiliary motor 9 per unit time. N _S is the electric assist motor 9 rotational speed allowable upper limit of the unit of time (allowable upper limit rotation speed), the M _S permissible winding upper limit weight, the product rated output characteristics of C _P is manually chain block 1, C ₉ electric The product rated output characteristics of the auxiliary motor 9 are shown respectively. For the protection of electric auxiliary motor with manual chain block 1, as shown in FIG. 3, engine speed range, and the allowable winding weight range exceeding an upper limit weight M _S exceeding the allowable upper limit rotation speed N _S of the electric auxiliary motor 9 ( The solid hatched area) is set to the “no assist” area (the area in which assistance by the electric auxiliary motor 9 is prohibited), and the above-mentioned product is within the rotational speed range of the electric auxiliary motor 9 with the product rated output characteristic C ₉ or less. the rated output characteristic C _P less engine speed range (the shaded region of the broken line) is set to "assist present" region. Further, a range (white background region) surrounded by the “assist” region and the “non-assist region” is set as an “assist decrease” region (region in which the assist rate by the electric auxiliary motor 9 is decreased).

The control unit 200 stores the above-mentioned “no assist” region, “assist present” region, and “assist reduced” region. The control unit 200 detects the rotational speed N ₉ of the electric auxiliary motor 9 detected by the input rotational speed sensor 17, the detection output T ₇ indicating the rotational force of the handwheel 3 detected by the torque sensor 7, and the motor current sensor 18. It has been electrically assisted driving state of the motor current I ₉ motorized based auxiliary motorized manual chain block 1 to the motor 9 is immediately from the motor driver 8 when it is determined that the "assist Mu" region to the electric assist motor 9 The support current _IA9 is cut off and the support of the electric auxiliary motor 9 is stopped. When it is determined that the driving state is in the “assist reduction” region, the assist rate (assist rate) by the electric auxiliary motor 9, that is, the support current _IA9 is decreased so that the driving state becomes the “assist” region. The guidance of the electric auxiliary motor 9 is continued. Thereby, breakage of parts constituting each part of the manual chain block 1 with the electric auxiliary motor 1 and excessive wear can be prevented and shortening of the life can be prevented. The assisting current I _A9 supplied to the electric auxiliary motor 9 is gradually increased so that the assist force does not suddenly act at the moment when the electric motor enters the “with assist” region by induction. Control to increase gradually.

FIG. 4 is a diagram showing a processing flow of the protection function in each of the “no assist” region, the “assist with” region, and the “assist reduced” region. First, calculate the weight M of the load L, performs the uptake of the rotational speed N ₉ of the electric auxiliary motor 9 (step ST11), followed by the weight M of the load L with the whether acceptable hoisting limit weight M _{S (rated} value by weight) or more Judgment is made (step ST12), and if it is equal to or greater than the product rated weight (Y), the support of the electric auxiliary motor 9 is stopped (assist stop) (step ST13). When the weight M of the load L is equal to or less than the product rated weight (N) in step ST12, it is subsequently determined whether the rotation speed N9 of the electric auxiliary motor ₉ is equal to or higher than the allowable upper limit rotation speed (step ST14). In the case of (Y), the process proceeds to step ST13, and the support of the electric auxiliary motor 9 is stopped.

Rotational speed N ₉ of the electric auxiliary motor 9 is not permissible speed or higher at step ST14 when the (N), followed by the rotation speed N ₉ products rated output characteristic C ₉ following rotation speed of the electric assist motor of the auxiliary motor 9 and determining whether the product rated output characteristic C _P rotation number range of the manual chain block 1 in the range (step ST15), below a predetermined set for the weight M of the load L in the case of (Y) The assistance by the electric auxiliary motor 9 is continued at the assistance rate (step ST16). If not (N) below, the assist rate of the auxiliary motor 9 is decreased to guide the operating state of the manual chain block 1 to the “assisted” region. Then, the operation of the auxiliary motor 9 is continued (step ST17).

Setting the allowable upper limit rotation speed N _S of the electric assist motor 9 shown in FIG. 3, the setting of the allowable winding upper weight M _S, setting products rated output characteristic C _P, each set of product rated output characteristic C ₉ of the electric auxiliary motor 9 Can be changed by changing the software of the control unit 200 without changing the mechanical configuration of the manual chain block 1 with the electric auxiliary motor, that is, the hardware part. Can also be easily implemented.

  Next, an example of a mechanical configuration of a manual chain block with an electric auxiliary motor using the overload prevention device having the above configuration will be described. 5 is a side sectional view showing a schematic configuration example of a manual chain block with an electric auxiliary motor according to the present invention, and FIG. 6 is a side showing a configuration on the case body side of the hand chain of the manual chain block with an electric auxiliary motor of FIG. It is sectional drawing. In the following description, the right side in FIG. 5 is the X1 side (one side), the left side is the X2 side (the other side), and the side where the upper hook Fu is located when viewed from the load chain C1 is the Z1 side (upper side). The side where the load chain C1 is located when viewed from the upper hook Fu is defined as the Z2 side (lower side).

  As shown in FIGS. 5 and 6, the manual chain block 1 with the electric auxiliary motor includes an upper hook Fu, a lower hook Fd (not shown), a load sheave 2, a hand wheel 3, a speed reduction mechanism 4, The drive shaft 5, brake mechanism 6, torque sensor 7, motor driver 8, and electric auxiliary motor 9 are the main components. The load sheave 2 is disposed between the first frame 11 and the second frame 12, and the handwheel 3 and the brake mechanism 6 are disposed between the second frame 12 and the third frame 13. A gear case 14 is disposed on the X1 side of the first frame 11, and the speed reduction mechanism 4 is disposed in the gear case 14. A cover 15 is disposed on the X2 side of the third frame 13, a motor driver 8 is disposed on the X2 side of the third frame 13 in the cover 15, and an electric auxiliary motor 9 is disposed on the X2 side. Has been.

  A load sheave hollow shaft 20 constituting the load sheave 2 is disposed through the first frame 11 and the second frame 12, and the first frame 11 and the second frame 12 are pivotally supported via bearings B1 and B2. Yes. The load sheave hollow shaft 20 has a pair of flange portions 21, 21, a chain pocket 22 is formed between the pair of flange portions 21, 21, and the load chain C 1 is fitted into the chain pocket 22. It has become. Thereby, with the rotation of the load sheave hollow shaft 20, the load chain C1 moves in the hoisting and lowering directions (Z1 and Z2 directions), and the load suspended by the lower hook Fd (not shown) can be raised and lowered. . Further, the connecting shaft 16 is positioned on the Z1 side of the chain pocket 22, and the upper hook Fu protrudes upward through the connecting shaft 16.

  A hollow hole 23 is formed in the load sheave hollow shaft 20, and the drive shaft 5 is inserted into the hollow hole 23. A bearing arrangement recess is formed at the end of the hollow hole 23 on the second frame 12 side, and a bearing B3 that supports the drive shaft 5 is arranged in the bearing arrangement recess. Further, a gear fitting portion is provided at the X1 side end portion of the load sheave hollow shaft 20, and a load gear 31 constituting the speed reduction mechanism 4 is fixed to the gear fitting portion by spline coupling. The reduction mechanism 4 is disposed in the gear case 14 as described above, and includes a small-diameter gear and a large-diameter gear 32 (not shown) in addition to the load gear 31. The small diameter gear meshes with the load gear 31 and the large diameter gear 32 meshes with the pinion gear 33 of the drive shaft 5.

  The drive shaft 5 is a member that transmits the driving force (rotational force) of the handwheel 3 and the electric auxiliary motor 9 described later to the load sheave hollow shaft 20 via the speed reduction mechanism 4. Therefore, the drive shaft 5 extends from the gear case 14 side (X1 side) to the cover 15 side. As described above, the center portion of the drive shaft 5 is rotatably supported by the bearing B3 in the hollow hole 23 of the load sheave hollow shaft 20, and the end portion on the X1 side of the drive shaft 5 is attached to the gear case 14 by the bearing B4. It is pivotally supported.

  Further, a multi-thread screw 42 is formed at a portion protruding from the hollow hole 23 of the load sheave hollow shaft 20 of the drive shaft 5 to the cover 15 side (X2 side). The multi-threaded screw 42 is screwed into the female threaded portion 51 a of the brake receiver 51 constituting the brake mechanism 6 and the female threaded portion 52 a of the wheel support member 52. A stepped portion 43 is provided at a position in front of the load sheave hollow shaft 20 in the drive shaft 5 toward the X1 side from the multi-threaded screw 42, and the drive shaft 5 The X2 side has a smaller diameter than the X1 side. When the brake receiver 51 is engaged (pressed) with the stepped portion 43 by screwing the multi-thread screw 42, the brake receiver 51 is rotated integrally with the drive shaft 5 thereafter.

  Further, a fitting convex portion 57 is provided at the X2 side end portion of the drive shaft 5, and the fitting convex portion 57 is fitted into the fitting concave portion 92 d of the outer rotor 92 of the electric auxiliary motor 9. 1 is constituted by the fitting convex portion 57 and the fitting concave portion 92d. The fitting convex portion 57 and the fitting concave portion 92d can transmit the rotational force of the outer rotor 92 of the electric auxiliary motor 9 to the drive shaft 5, such as a key, spline, non-circular (for example, polygonal) fitting. Any fitting structure may be used.

  As shown in FIG. 5, the brake mechanism 6 includes a brake receiver 51, a wheel support member 52, a pair of brake plates 53 a and 53 b, and a claw wheel 54. The brake receiver 51 has a flange portion 51b in addition to the female screw portion 51a described above. The brake plate 53a contacts the flange portion 51b from the X2 side, and the brake plate 53a is in contact with the claw wheel 54. Pinch.

  As shown in FIGS. 5 and 6, the wheel support member 52 also has a flange portion 52 b in addition to the female screw portion 52 a, and the brake plate 53 b comes into contact with the flange portion 52 b from the X1 side, The brake plate 53b is sandwiched therebetween. The wheel support member 52 has a cylindrical portion 52 c, and the cylindrical portion 52 c is located inside the hub cylindrical portion 62 a of the wheel hub 62 and supports the wheel hub 62. A spline 52d is provided at the end of the cylindrical portion 52c on the X2 side, and is fitted with the spline of the wheel hub 62 so as to be rotatable integrally with the wheel hub 62. Further, the end portion on the X2 side of the cylindrical portion 52c protrudes from the hub cylindrical portion 62a.

  A claw wheel 54 is disposed on the outer peripheral side of the brake receiver 51. The claw wheel 54 functions as a part of the brake mechanism 6 by engaging with the brake plates 53a and 53b, but also functions as a one-way clutch by engaging with a claw member (not shown). Note that even if the load sheave hollow shaft 20 attempts to rotate in the direction of lowering the load and the drive shaft 5 is rotated via the speed reduction mechanism 4, the rotation is prevented by the claw member of the claw wheel 54. Here, when the drive shaft 5 tries to rotate with respect to the wheel support member 52, the flange portion 52 b presses the hook wheel 54 through the brake plate 53 b due to the engagement of the female screw portion 52 a and the multi-thread screw 42. The force of the pressure contact also acts on the brake receiver 51 via the brake plate 53a, and the brake receiver 51 is prevented from rotating together with the drive shaft 5.

  In addition, the handwheel 3 includes a wheel ring 61 and a wheel hub 62 that fixes the wheel ring 61. The annular wheel ring 61 has a chain pocket 61a, and a hand chain C2 is fitted in the chain pocket 61a. As a result, the handwheel 3 is rotated in either the load winding direction or the load lowering direction by pulling the hand chain C2.

  The wheel hub 62 has a hub cylinder part 62 a extending toward the X2 side, and the hub cylinder part 62 a enters the inside of the cover 15. The hub cylinder 62a is rotatably supported via bearings B5 and B6 on the inner cylinder side of a cylinder member 80 described later. The bearings B5 and B6 are located at a predetermined interval, and rotatably support the wheel hub 62 and the handwheel 3. A spline 62b that meshes with the spline 52d is provided on the inner cylinder side of the hub cylinder 62a.

Here, a magnetostrictive portion 62c is provided on the outer peripheral side of the hub tube portion 62a. The magnetostrictive portion 62 c is a portion constituting the torque sensor 7. The magnetostrictive portion 62c is rotatably supported with respect to the sensor coil 71 by bearings B5 and B6. At least the surface of the magnetostrictive portion 62c is made of a magnetostrictive material, and is opposed to the sensor coil 71 constituting the torque sensor 7 in a non-contact manner. When the magnetostrictive portion 62c is twisted, the permeability of the twisted portion changes, and the change in the magnetic permeability is detected by the sensor coil 71 as a change in inductance in a non-contact manner (T in FIG. 1). ₇ ). The torque sensor 7 may be a contact type such as a slip ring type. Further, the torque sensor 7 is not limited to the magnetostrictive method, and any sensor that can detect the torque applied to the wheel ring 61 may be used.

  A cylindrical member 80 is attached to the third frame 13. On the inner cylinder side of the cylindrical member 80, the above-mentioned bearings B5 and B6 are arranged at a predetermined interval, the wheel hub 62 is rotatably supported by the bearings B5 and B6, and between the bearings B5 and B6. The sensor coil 71 is also arranged. Thereby, on the inner cylinder side of the cylindrical member 80, the wheel hub 62 (hand wheel 3) is rotatably supported, and the magnetostrictive portion 62c rotates without contact with the sensor coil 71. A bearing housing portion that houses the bearings B5 and B6 is formed on the inner cylinder side of the cylindrical member 80.

  A stator 91 of the electric auxiliary motor 9 is fixed to the X2 side of the cylindrical member 80. Although not shown, the stator 91 is wound with a stator coil. A predetermined number of the stators 91 are arranged in the circumferential direction. In addition, a hole 91a is provided at the center of the stator 91 in the radial direction, and the center shaft 92c of the outer rotor 92 of the electric auxiliary motor 9 is inserted into the hole 91a. The central shaft portion 92c is an extended portion toward the X1 side from the X2 side end surface of the outer rotor 92. The central shaft portion 92c is fixed to the outer rotor 92 via screws 93 and the like. The central shaft portion 92c is a columnar portion and is a portion inserted into the hole portion 91a. In the hole portion 91a, the central shaft portion 92c is supported by the cylindrical member 80 via bearings B7 and B8.

  A fitting recess 92d that is recessed toward the X2 side is provided at the end of the central shaft portion 92c on the X1 side. The fitting concave portion 92 d is a portion into which the fitting convex portion 57 of the drive shaft 5 is fitted, and by this fitting, the driving force of the outer rotor 92 of the electric auxiliary motor 9 is at least hoisted by the operation of the brake mechanism 6. Sometimes it rotates integrally with the handwheel 3. In the fitting recess 92d, the fitting projection 57 of the drive shaft 5 can be moved slightly in the axial direction. Thereby, when the drive shaft 5 receives a large load in the thrust direction, a slight backlash (movement in the axial direction) is possible. The end portion on the X2 side of the central shaft portion 92c is a portion supported by the bearing B9 (thrust bearing), and even if a pushing force is applied to the central shaft portion 92c from the drive shaft 5 side or the cylindrical portion 52c side, The load can be received.

  A cover 15 is attached to the third frame 13, and the cover 15 and the third frame 13 constitute a case main body 100. An internal space P that is airtightly closed from the outside by the case body 100 is formed. In the internal space P, the electric auxiliary motor 9, the motor driver 8, and the torque sensor 7 are arranged as described above. The cover 15 is attached in a cup shape with its peripheral wall end (X1 side end) in contact with the third frame 13. A bearing support portion that accommodates the bearing B9 is provided at the center in the radial direction on the inner wall surface on the X2 side that is the bottom of the cup-shaped cover 15.

  Next, the operation of the manual chain block 1 with the electric auxiliary motor configured as described above will be described. When the hand chain C2 is operated with a hand pulling force in the winding direction in a state where a load is applied to the lower hook Fd (not shown), the hand wheel 3 rotates. Along with the rotation of the handwheel 3, the wheel support member 52, which is splined with the wheel hub 62 that rotates integrally with the handwheel 3, also rotates. As a result, the wheel support member 52 moves toward the X1 side by meshing with the multi-thread screw 42 at the female screw portion 52a. By this movement, the flange portion 52b of the wheel support member 52 presses the brake plate 53b on the X2 side, and the claw wheel 54 presses the brake plate 53a on the X1 side. Due to this pressing, the brake receiver 51 that is in a non-rotating state together with the drive shaft 5 is rotated together with the wheel support member 52 and the handwheel 3.

The brake receiver 51 moves toward the X1 side by meshing with the multiple screw 42 at the female screw portion 51a. After a while, the brake receiver 51 abuts against the stepped portion 43, and further moves to the X1 side. Is blocked. As a result, the brake receiver 51 is coupled to the drive shaft 5 in a driving manner, and the drive shaft 5 also rotates as the handwheel 3 rotates. As the handwheel 3 rotates, the hub cylinder 62a and the magnetostrictive portion 62c are twisted. Thus the permeability changes in the magnetostrictive portion 62c, a change in inductance corresponding to a change in the permeability is detected by the sensor coil 71, as shown in FIG. 1, as the detection output T ₇ from the torque sensor 7, the control unit 200 is input.

As shown in FIG. 1, the control unit 200 includes a current I ₉ to the electric auxiliary motor 9 detected by the motor current sensor 18, a detection output T ₇ of the torque sensor ₇ (transmission due to torsion of the magnetostrictive portion 62 c of the sensor coil 71). Inductance change due to change in magnetic susceptibility) is input. The control unit 200 detection output T _7, the rotation force of the hand wheel 3 starts the electric auxiliary motor 9 in the case of more than a predetermined, to the electric assist motor 9 detected by the motor current sensor 18 as described above to calculate the weight M of the load L from the detection output T ₇ of the current I ₉ and the torque sensor 7, as described above. Then, from the support ratio with respect to the weight M, a support divided current I _A9 to be supplied to the electric auxiliary motor 9 is determined, the motor driver 8 is controlled, and the support _divided current I _A9 is supplied to the electric auxiliary motor 9.

In the above example determines the support component current I _A9 from support ratio by weight M of load L, but to calculate the rotational force of the hand wheel 3 from the detection output T ₇ of the torque sensor 7, what the rotational force In some cases, the support _divided current I _A9 is determined depending on the support, and the support _divided current I _A9 is supplied to the electric auxiliary motor 9.

As described above, when the auxiliary electric current _IA9 is supplied to the electric auxiliary motor 9, the outer rotor 92 of the electric auxiliary motor 9 rotates at a torque corresponding to the auxiliary electric current _IA9 , and the rotational force is driven. Axis 5 is given. The rotational force of the drive shaft 5 is transmitted to the load sheave hollow shaft 20 via the speed reduction mechanism 4, and the load sheave hollow shaft 20 is rotated. As a result, the load chain C1 is sent in the direction in which the load L is raised.

  Next, when unloading the lifted load, the hand chain C2 is pulled in the direction opposite to when lifting the load. As a result, the wheel support member 52 that rotates together with the handwheel 3 loosens the pressure contact with the brake plates 53b and 53a. The drive shaft 5 rotates in the direction opposite to the winding direction by the weight of the load L by the loosened amount. As a result, the load L is gradually lowered.

  Here, even when the hand chain C2 is released during winding or lowering, the load does not fall. In this case, even if a rotational force for reversing the drive shaft 5 by the gravity of the load L acts, the wheel support member 52 does not rotate when the handwheel 3 does not rotate. The wheel support member 52 tends to move toward the X1 side by meshing with the multi-thread screw 42 at the female screw portion 52a of the wheel support member 52. Then, since the wheel support member 52 presses the brake plates 53a and 53b against the claw wheel 54 and further the rotation of the claw wheel 54 is prevented, the brake receiver 51 does not rotate with the drive shaft 5, and the brake receiver 51 Abut. After this contact, the rotation of the drive shaft 5 is prevented. This prevents the load from falling.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. In particular, the mechanical configuration of the manual chain block with the electric auxiliary motor is not limited to the configuration shown in FIGS. 5 and 6. Moreover, although the outer rotor type DC brushless motor is used for the electric auxiliary motor 9, it is not limited to this, and an inner rotor type DC brushless motor may be used. Moreover, another electric motor, for example, an induction type electric motor may be used.

  The manual chain block with the electric auxiliary motor (as well as the manual hoisting machine with the electric auxiliary motor) supports the rotation of the handwheel 3 by the electric auxiliary motor 9 as described above. It can be simplified further. For example, the chain block speed reduction mechanism 4 may be omitted. In this case, since the speed reduction mechanism 4 is not provided, the mechanical configuration of the manual chain block (manual hoisting machine) is further simplified.

  In the present invention, when the rotation speed detected by the rotation speed detection sensor exceeds the allowable upper limit rotation speed, the assistance is limited by the electric auxiliary motor, and the weight value detected by the weight detection means becomes a predetermined allowable upper limit weight value. When it exceeds, the support is stopped by the electric auxiliary motor, and when the detected weight value does not exceed the allowable upper limit weight value, the power is calculated, and when the calculated power does not exceed the allowable upper limit power In addition to implementing support by the electric motor at a predetermined support rate, if the calculated work rate exceeds the allowable upper limit work rate, the support rate by the electric auxiliary motor is reduced until it falls below the allowable upper limit work rate, and then the predetermined support Therefore, it is possible to prevent over-winding operation with a weight exceeding the product rating, over-speed operation exceeding the product rated speed, and over-work rate operation exceeding the product rated total work rate. Without excessively to performance improvement auxiliary motorized manual hoist can be used as a protective device for an electric auxiliary motor with hoist capable of maintaining the product life. Also, this type of manual hoisting machine with an electric auxiliary motor usually includes the torque sensor and the current sensor. For example, when the control means is constituted by a microcomputer, the existing electric motor only needs to be changed. Manual hoisting machine with auxiliary motor can be equipped with protection.

DESCRIPTION OF SYMBOLS 1 Manual chain block 2 Load sheave 3 Hand wheel 4 Deceleration mechanism 5 Drive shaft 6 Brake mechanism 7 Torque sensor 8 Motor driver 9 Electric auxiliary motor 11 First frame 12 Second frame 13 Third frame 14 Gear case 15 Cover 16 Connecting shaft 17 Rotation Speed sensor 18 Motor current sensor 20 Load sheave hollow shaft 21 Flange portion 22 Chain pocket 23 Hollow hole 31 Load gear 32 Large diameter gear 33 Pinion gear 42 Multi-thread screw 43 Step portion 51 Brake receiver 51a Female thread portion 51b Flange portion 52 Wheel support member 52a Female thread portion 52b Flange portion 52c Tubular portion 52d Spline 53a Brake plate 53b Brake plate 54 Claw wheel 57 Fitting convex portion 61 Wheel ring 61a Chain pocket 62 Wheel hub 62a Hub tubular portion 62b Spline 62c Magnetostrictive portion 71 Sensor coil 80 Cylindrical member 91 Stator 91a Hole 92 Outer rotor 92c Center shaft 92d Fitting recess 93 Screw 100 Case body 200 Controller B1-B9 Bearing C1 Load chain C2 Hand chain Fu Upper hook Fd Lower hook J Joint

Claims (6)

Generated by hand-drawing the handwheel member, which includes a drive wheel on which a load suspension member for hanging the load is hung, a manual wheel on which a handwheel member is hung, and an electric auxiliary motor that supports rotation of the drive wheel. The rotational force of the manual wheel is transmitted to the drive wheel via a drive shaft, the load suspended by the load suspension member is lifted and lowered, and the weight of the load at the time of lifting the load exceeds a predetermined value. In this case, the protection device for the manual hoisting machine with the electric auxiliary motor that supports the rotation of the driving wheel by supplying a predetermined driving current from the motor driver to the electric auxiliary motor under the control of the control means to operate the electric auxiliary motor. Because
A rotational speed sensor for detecting the rotational speed of the electric auxiliary motor;
Weight detection means for detecting the weight of the load,
When the detected rotational speed detected by the rotational speed detection sensor exceeds an allowable upper limit rotational speed, or when the detected weight value detected by the weight detection means exceeds a predetermined allowable upper limit weight value, the control means Limits the support by the electric auxiliary motor, and calculates the power when the detected rotation speed does not exceed the allowable upper limit rotation speed and the detected weight value does not exceed the allowable upper limit weight value. When the calculated power does not exceed the allowable upper limit power, the electric assist motor is supported at a predetermined support rate, while when the calculated power exceeds the allowable upper limit power, the electric auxiliary motor A manual hoisting machine with an electric auxiliary motor, wherein the electric motor is used to support at a predetermined support rate after the support rate is reduced to a value equal to or lower than the allowable upper limit work rate. Protection equipment. A rotational force sensor for detecting the rotational force of the manual wheel;
A current sensor for detecting a current to be supplied to the electric auxiliary motor,
2. The manual hoisting machine with an electric auxiliary motor according to claim 1, wherein the control means detects the weight of the load from a detected rotational force detected by the rotational force sensor and a detected current detected by the current sensor. Protective device. Generated by hand-drawing the handwheel member, which includes a drive wheel on which a load suspension member for hanging the load is hung, a manual wheel on which a handwheel member is hung, and an electric auxiliary motor that supports rotation of the drive wheel. The rotational force of the manual wheel is transmitted to the drive wheel via a drive shaft, the load suspended by the load suspension member is lifted and lowered, and the weight of the load at the time of lifting the load exceeds a predetermined value. In this case, the protection device for the manual hoisting machine with the electric auxiliary motor that supports the rotation of the driving wheel by supplying a predetermined driving current from the motor driver to the electric auxiliary motor under the control of the control means to operate the electric auxiliary motor. Because
The control means includes, in the relationship between the rotational speed of the electric auxiliary motor and the weight of the load, a non-supporting area for invalidating the assistance by the electric auxiliary motor, and a supporting area for validating the assistance by the electric auxiliary motor; And setting a support rate reduction area for reducing the support rate surrounded by the support-free area and the support-enabled area,
When the operating state of the manual hoisting machine with the electric assist motor is in the support-provided region, the control means performs the support by the electric assist motor at a predetermined support rate, and the operation state becomes the no-support region. In some cases, the support by the electric auxiliary motor is stopped, and in the case where the driving state is in the support rate reduction region, the support rate is decreased until the driving state is in the support provided region. A protection device for a manual hoisting machine with an electric auxiliary motor, wherein the electric auxiliary motor supports at the predetermined support rate. A rotational force sensor for detecting the rotational force of the manual wheel;
A current sensor for detecting a current to be supplied to the electric auxiliary motor;
A rotation speed sensor for detecting a rotation speed of the electric auxiliary motor;
The control means takes in the detected rotational force detected by the rotational force sensor, the detected current detected by the current sensor, and the detected rotational speed detected by the rotational speed sensor, and controls support by the electric auxiliary motor. The protective device for a manual hoisting machine with an electric auxiliary motor according to claim 3. Generated by hand-drawing the handwheel member, which includes a drive wheel on which a load suspension member for hanging the load is hung, a manual wheel on which a handwheel member is hung, and an electric auxiliary motor that supports rotation of the drive wheel. The rotational force of the manual wheel is transmitted to the drive wheel via a drive shaft, the load suspended by the load suspension member is lifted and lowered, and the weight of the load at the time of lifting the load exceeds a predetermined value. In this case, a method of protecting a manual hoisting machine with an electric auxiliary motor that supplies a predetermined driving current from a motor driver to the electric auxiliary motor under the control of the control means to operate the electric auxiliary motor and assists the rotation of the driving wheel. Because
When the rotational speed of the electric auxiliary motor exceeds the allowable upper limit rotational speed or when the weight of the load exceeds a predetermined product rated weight, the support by the electric auxiliary motor is limited, and the rotational speed is set to the allowable upper limit rotational speed. If it does not exceed and the weight does not exceed the rated product weight, the power is calculated, and if the calculated power does not exceed the allowable upper limit power, the electric auxiliary motor is driven at a predetermined support rate. When the calculated work rate exceeds the allowable upper limit power, the support rate by the electric auxiliary motor is decreased until the calculated upper power limit is less than or equal to the allowable upper limit power. A method for protecting a manual hoisting machine with an electric auxiliary motor, characterized in that the electric auxiliary motor is used for support. Generated by hand-drawing the handwheel member, which includes a drive wheel on which a load suspension member for hanging the load is hung, a manual wheel on which a handwheel member is hung, and an electric auxiliary motor that supports rotation of the drive wheel. The rotational force of the manual wheel is transmitted to the drive wheel via a drive shaft, the load suspended by the load suspension member is lifted and lowered, and the weight of the load at the time of lifting the load exceeds a predetermined value. In this case, a method of protecting a manual hoisting machine with an electric auxiliary motor that supplies a predetermined driving current from a motor driver to the electric auxiliary motor under the control of the control means to operate the electric auxiliary motor and assists the rotation of the driving wheel. Because
In the control means, in the relationship between the rotational speed of the electric auxiliary motor and the weight of the load, a non-supporting area in which the assistance by the electric auxiliary motor is invalidated, and a supporting area in which the assistance by the electric auxiliary motor is valid And a support rate reduction region for reducing the support rate surrounded by the support-free region and the support-provided region,
When the operating state of the manual hoisting machine with the electric auxiliary motor is in the support-provided region, the electric auxiliary motor is supported at a predetermined support rate, and when the driving state is in the no-assistance region, the electric assist is performed. Stop the support by the motor, and if the driving state is in the support rate reduction region, decrease the support rate until the driving state becomes the supportable region, and when the driving state becomes the supportable region, the predetermined support rate at the predetermined support rate A method for protecting a manual hoisting machine with an electric auxiliary motor, characterized in that an electric auxiliary motor is used for support.

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