JP2887457B2 - Double drive electric chain block - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-drive electric chain block provided with a load chain piece flow adjusting means for adjusting the flow of a load chain in one direction or the other direction.

[0002]

2. Description of the Related Art Conventionally, this kind of technology has been disclosed in
There has been a double-drive electric chain block having a load-chain flow control device as disclosed in US Pat. FIG. 7 is a diagram showing a configuration of the double drive electric chain block.

The double-drive electric chain block has an upper idler wheel 102 mounted on an upper support frame 101 and electric chain blocks 10 on both sides thereof.
8 and 109 are fixed, and lower idler sheaves 105 and 106 are provided on both sides of the lifting frame 104 supporting the lower hook 103.
And a single load chain 107 is suspended over the load sheaves 108a, 109a of the electric chain blocks 108, 109, the lower idle sheaves 105, 106, and the upper idle sheave 102.

A first limit switch LS1 which is operated by a striker SR attached to the upper idler sheave 102 or a load chain 107 hanging therefrom to detect a flow of a load chain in one direction, and detects a flow of a load chain in the other direction. Second
The limit switch LS2 and the upper support frame 101
When the one of the limit switches LS1 or LS2 is operated, the operation of one of the electric driving devices is stopped and the operation of correcting the flow of the load chain piece is performed. There is a timer that works to keep it running for a time.

[0005]

The double-drive electric chain block having the above-mentioned chain piece flow adjusting device combines two limit switches LS1 and LS2 having an effect that the chain piece flow correction can be performed, and a timer. Since an electric circuit is required, the circuit configuration becomes complicated, and at the same time, it is difficult to adjust the mounting positions of the limit switches LS1 and LS2 and adjust the timer, and the detection position of the load flow is limited by the limit switches LS1 and LS2. Since it is limited to the mounting position, it has been difficult to freely adjust the detection position of the flow of the load.

[0006] For some reason, if the load flow control device composed of an electric circuit or the like in which the limit switches LS1 and LS2 and the timer are combined is inoperative, the load flow may not be corrected, which may lead to an accident. I was afraid.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and is capable of detecting a load flow of a load with a simple configuration and of freely setting the flow amount of load, and extremely easy to adjust. It is an object of the present invention to provide a double-drive electric chain block having:

Further, the present invention provides an emergency load chain piece flow adjusting means for correcting the load chain piece flow in the case of an emergency where the load chain piece flow adjusting means is inoperative for some reason and the load chain piece flow becomes a predetermined value or more. It is an object of the present invention to provide a double-drive electric chain block having:

[0009]

According to a first aspect of the present invention, an upper idler sheave is mounted on an upper support frame and first and second electric chain blocks are fixed on both sides thereof. First and second lower idler sheaves are mounted on both sides of a lifting frame that supports the lower hook, and one load chain is connected to the first and second idler sheaves and the first and second electric chains. In a double-drive electric chain block suspended over each of the load sheaves of the block and the upper idle sheave, subtracted when the load shed flows to the first idle sheave side in conjunction with the rotation of the upper idle sheave. Alternatively, there is provided a rotary encoder that adds and counts and adds or subtracts the counter value when flowing to the second idle chain wheel. When the value becomes a value, the operation of the first or second electric chain block is stopped, and the load chain piece flow adjusting means for correcting the single flow of the load chain until the count value of the rotary encoder becomes 0 or a predetermined value or less. It is characterized by having been provided.

In addition, there is provided a load flow detecting means which is activated when the load flow control means does not operate for some reason and the load flow of the load exceeds a predetermined value. Is operated, the operation of the first or second electric chain block is stopped, and an emergency load chain piece flow adjusting means for correcting the flow of the load chain is provided.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a double drive electric chain block according to the present invention.

In the double-drive electric chain block, an upper idler wheel 102 is attached to a central portion of an upper support frame 101, and first and second electric chains are attached to one end and the other end of the upper support frame 101 in the left-right direction. The chain blocks 108 and 109 are attached, and the lower hook 103
The first and second lower idler sheaves 105 and 106 are attached to the left and right sides of the lifting frame 104 that supports the
One load chain 107 is connected to each electric chain block 108,
109, the load sheaves 108a, 109a, the side lower idle sheaves 110, 111 and the side upper idle sheaves 112, 113 attached to the upper support frame 1, the lower idle sheaves 105, 106, and the upper idle sheave 102. It is a configuration wound around. Both ends of the load chain 107 are accommodated in buckets 114 and 114.

[0015] 115 and 116 connect short chains,
It is a chain connecting member for forming the book load chain 107. 11
Reference numerals 7 and 118 denote switch operating bodies that actuate a limit switch (not shown) when the chain connecting member rises and abuts. Reference numeral 119 denotes a rotary encoder that rotates in conjunction with the rotation of the upper idler sheave 102, and detects a one-sided flow of the load chain 107. Switch operation body 11
As will be described later, the chain connecting members 115 and 118 are used when the rotary encoder 119 cannot detect the one-sided flow of the load chain 107 for some reason or when the load-sided single-piece flow adjusting means for correcting the one-sided flow of the load chain is inoperative. 116
The chain connecting members 115 and 116 and the switch operating bodies 1 are used for urgently detecting one-sided flow of the load chain.
The distances 17 and 118 are set substantially equal.

FIG. 2 is a diagram showing the configuration of a load chain piece flow detecting means for detecting the flow of the load chain 107 based on the output from the rotary encoder 119. Reference numeral 10 denotes a load chain piece flow detector to which signals from the winding push-down switches PB-U and PB-D and a signal from the rotary encoder 119 are input. The load piece flow detector 10 activates the relay 11 when the count value of the rotary encoder 119 is equal to or more than a predetermined + value during winding, and activates the relay 12 when the count value is equal to or less than a predetermined − value. It has become. When the count value of the rotary encoder 119 is equal to or more than a predetermined + value during the lowering, the relay 13 is operated, and when the count value is equal to or less than the predetermined-value, the relay 14 is operated.

In the double-drive electric chain block having the above-described structure, the upper idler sheave 102 is used to raise and lower the first and second electric chain blocks 108 and 1.
When the load trucks 09a and 109a rotate at the same rotation speed, they do not rotate.
If the rotation speeds of the rotation shafts a and 109a are different from each other, they rotate to one of them, and the one-sided flow of the load chain 107 occurs. This chain 107
Is proportional to the number of rotations of the upper idler sheave 102, that is, the number of rotations of the rotary encoder 119.
07 can be detected.

FIG. 3 and FIG. 4 are diagrams showing the configuration of a drive circuit for a double drive electric chain block, a control circuit including a load chain piece flow adjusting means, and an emergency load chain piece flow adjusting means.

In FIG. 3, reference numeral 108M denotes a drive motor of the electric chain block 108, and 109M denotes a drive motor of the electric chain block 109. In FIG. 4, when the hoisting push button switch PB-U is pressed, the electromagnetic switches 15 and 16 operate, and the normally open contacts 15a and 1
6a is closed. Thereby, the electric chain block 108
And 109M are driven in the hoisting direction, and the electric chain blocks 108 and 109 start the hoisting operation. When the lowering push button switch PB-D is pressed, the electromagnetic switches 17 and 18 are operated, and the normally open contacts 17a and 18a are closed. As a result, the drive motor 108 of the electric chain blocks 108 and 109
M and 109M are activated in the lowering direction, and the electric chain blocks 108 and 109 start the lowering operation.

FIG. 5 is a diagram showing the flow of the hoisting operation.
Here, the detected value of the flow of the fragmented pieces of the chained piece flow detector 10 is ±
It is assumed that 1000 is set. By pressing the hoisting push button switch PB-U, the drive motors 108M and 109M are activated in the hoisting direction as described above to start hoisting (step ST1). Chain piece flow detector 10
Reads the count value of the rotary encoder 119, and detects whether or not the count value x is within a range of -1000 <x <1000, that is, whether the load chain 107 is in a state where the one-sided flow needs to be corrected (step). ST2). If the correction is not required, the hoisting operation is continued, and if the correction is required, the chain piece flow detector 10 performs a correction required process (step ST3).

In the above-described correction necessary processing, the count value x of the rotary encoder 119 is x <−1000.
If so, the relay 12 is actuated, whereby the normally closed contact 12b is opened, the electromagnetic switch 16 is deactivated, and the normally open contact 16a is opened, so that the drive motor 109M of the second electric chain block 109 is It stops, and the winding operation stops (step ST4). This winding stop is continued until the count value x of the rotary encoder 119 becomes x = 0 (step ST5). If the count value x of the rotary encoder 119 is 1000 <x, the relay 11 is operated, and the normally closed contact 1
1b is opened, the electromagnetic switch 13 is deactivated and its normally open contact 13a is opened.
Drive motor 108M stops, and the hoisting operation stops (step ST6). This winding stop is continued until the count value x of the rotary encoder 119 becomes x = 0 (step ST7).

FIG. 6 is a diagram showing the flow of the lowering operation.
By pressing the lowering push button switch PB-D,
As described above, the drive motors 108M and 109M are activated in the lowering direction to start lowering (step ST11). The load chain piece flow detector 10 reads the count value of the rotary encoder 119, and the count value x is -1000 <x
<1000, that is, whether or not the load chain 107 is in a state where the one-sided flow needs to be corrected (step ST12). If the correction is not required, the unwinding operation is continued, and if the correction is required, the chain piece flow detector 10 performs a correction required process (step ST13).

In the above-described correction necessary processing, the count value x of the rotary encoder 119 is set to x <−1000.
If so, the relay 13 is actuated, whereby the normally closed contact 13b is opened, the electromagnetic switch 17 is deactivated and the normally open contact 17a is opened, so that the drive motor 108M of the electric chain block 108 is stopped, The lowering operation stops (step ST14). This lowering stop is continued until the count value x of the rotary encoder 119 becomes x = 0 (step ST15). Further, if the count value x of the encoder is 1000 <x, the relay 14 is operated, whereby the normally closed contact 14b is opened, the electromagnetic switch 18 is deactivated, and the normally open contact 18a is opened. Drive motor 109 for chain block 109
M stops, and the lowering operation stops (step ST1).
6). This lowering stop is continued until the count value x of the rotary encoder 119 becomes x = 0 (Step S)
T17).

If the load chain piece flow detector 10 does not detect the flow direction of the load chain 107 for some reason, or if the load flow control means does not correct the flow direction of the load chain 107 for some reason, the flow of the load chain 107 will not be corrected. Lead chain connecting member 11
5 comes into contact with the switch operating body 117 to operate the limit switch in conjunction therewith or to operate the link connecting member 116.
Abuts on the switch operating body 118 to operate the limit switch in conjunction therewith. The operation of the limit switch activates the emergency load chain piece flow adjusting means, and corrects the emergency flow of the load chain 107 as described below.

During the hoisting operation, the speed of the electric chain block 108 becomes faster than the hoisting speed of the electric chain block 109, and the load chain 107 flows in one direction in the direction of arrow A.
If the one-sided flow is not corrected, the chain linking member 115 contacts the switch operating body 117, the limit switch is activated, and when the contact 117a is closed, the relay 19 is activated.
The normally closed contact 19b is opened, the electromagnetic switch 15 is deactivated, and the normally open contact 15a is opened.
08 is stopped, and the load chain 107 is moved in the winding direction of the electric chain block 109, that is, in the direction of arrow B.
Is corrected. At the same time as the operation of the relay 19, the timer 20 is operated and a predetermined time (for example, 3
When a time set within 0 seconds has elapsed, the normally closed contact 20b is opened, the relay 19 is deactivated, the electromagnetic switch 15 is activated again, and the electric chain block 108 performs a hoisting operation.

Also, during the hoisting operation, the speed of the electric chain block 109 becomes faster than the hoisting speed of the electric chain block 108, and
When a one-way flow occurs in the direction of arrow B, the chain linking member 116 comes into contact with the switch operation body 118, the limit switch is operated, and when the contact point 118a is closed, the relay 21 is operated.
The normally closed contact 21b is opened, the electromagnetic switch 16 is deactivated, and the normally open contact 16a is opened.
09, the drive motor 109M is stopped, and the load chain 107 is moved in the winding direction of the electric chain block 108, that is, in the direction of arrow A.
Is corrected. When the timer 22 operates simultaneously with the operation of the relay 21 and a predetermined set time has elapsed, the normally closed contact 22b opens, the relay 21 becomes inactive, the electromagnetic switch 16 operates again, and the electric chain block 109 operates. Performs a winding operation.

In the lowering operation, the speed of the electric chain block 108 is reduced.
, The load chain 107 generates a one-way flow in the direction of arrow B, and the chain connecting member 116 is connected to the switch operating body 1.
18, the limit switch is activated and its contact 11
8a is closed, the relay 21 is activated and its normally closed contact 21
b opens, the electromagnetic switch 17 becomes inoperative, the normally open contact 17a opens, the drive motor 108M of the electric chain block 108 stops, and the one-way flow of the load chain 107 in the lowering direction of the electric chain block 109, that is, the direction of arrow A. Is corrected. At the same time as the operation of the relay 21, the timer 2
2 operates and after a predetermined time has elapsed, the normally closed contact 22b opens, the relay 21 becomes inactive, the electromagnetic switch 17 operates again, and the electric chain block 108 performs the lowering operation.

During the lowering operation, the speed of the electric chain block
, The one-sided flow occurs in the direction of arrow A in the load chain 107, and the chain connecting member 115
17, the limit switch is activated and its contact 11
7a is closed, the relay 19 is activated and its normally closed contact 19
b opens, the electromagnetic switch 18 becomes inoperative, the normally open contact 18a opens, the drive motor 109M of the electric chain block 109 stops, and the one-way flow of the load chain 107 in the lowering direction of the electric chain block 108, that is, the arrow B direction. Is corrected. At the same time as the operation of the relay 21, the timer 2
When the predetermined time has elapsed after the operation of the switch 2, the normally closed contact 22b is opened, the relay 21 is deactivated, the electromagnetic switch 18 is activated again, and the electric chain block 109 performs the lowering operation.

As described above, in this embodiment, if the load flow control means including the rotary encoder 119, the load flow detector 10, and the relays 11, 12, 13, and 14 does not operate for some reason, The emergency load chain flow adjusting means including the limit switches, the relays 19 and 21 and the timers 20 and 22 is operated to activate the emergency load chain 107.
However, the emergency load chain flow adjusting means may not be provided in some cases.

The double drive electric chain block is shown in FIG.
The first and second lower idler sheaves 105 and 106 provided on the left and right sides of the elevating frame 104 and the side upper idler sheave 112 attached to the upper support frame 1 are not limited to the configuration shown in FIG. Naturally, the number of 113 is not limited to this.

[0029]

As described above, according to the present invention, the following excellent effects can be obtained. (1) According to the invention as set forth in claim 1, a rotary encoder is provided which is added or subtracted in conjunction with the rotation of the upper idler and in conjunction with the rotation of the loader, and the count value of the rotary encoder is- Alternatively, when a predetermined value is obtained in the + direction, the operation of one of the first and second electric chain blocks is stopped, and the count value of the rotary encoder becomes 0.
Or a double-drive electric chain block capable of detecting a load chain piece flow with a simple configuration and freely setting a load chain piece flow amount because a load chain piece flow adjusting means for correcting a load chain piece flow until the load chain piece flow becomes equal to or less than a predetermined value is provided. Can be provided.

(2) According to the second aspect of the present invention, since the emergency load chain flow adjusting means is provided, the load flow adjusting means is inoperative for some reason, and the flow of the load chain is reduced. It is possible to provide a double-drive electric chain block capable of correcting the one-sided flow of the load chain even in an emergency in which the value exceeds a predetermined value.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a double drive electric chain block of the present invention.

FIG. 2 is a view showing a configuration of a chain piece flow detecting means.

FIG. 3 is a diagram illustrating a configuration of a drive circuit of the double drive electric chain block according to the present invention.

FIG. 4 is a diagram showing a configuration of a control circuit of the double drive electric chain block of the present invention.

FIG. 5 is a diagram showing a flow of a winding operation of the double drive electric chain block of the present invention.

FIG. 6 is a diagram showing a flow of a lowering operation of the double drive electric chain block of the present invention.

FIG. 7 is a view showing a configuration of a conventional double drive electric chain block.

[Explanation of symbols]

 PB-U Hoisting push button switch PB-D Hoisting push button switch 10 Load chain piece detector 11 Relay 12 Relay 13 Relay 14 Relay 15 Electromagnetic switch 16 Electromagnetic switch 17 Electromagnetic switch 18 Electromagnetic switch 19 Relay Reference Signs List 20 timer 21 relay 22 timer 101 upper support frame 102 upper idler wheel 103 lower hook 104 elevating frame 105 first lower idler wheel 106 second lower idler wheel 107 loading chain 108 first electric chain block 109 second Electric chain block 108M Drive motor 109M Drive motor 110 Side lower idler wheel 111 Side lower idler wheel 112 Side upper idler wheel 113 Side upper idler wheel 114 Bucket 115 Chain linking member 116 Chain linking member 117 Switch operation body 118 Switch operation body 119 Rotary encoder

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-47-36456 (JP, A) JP-A-57-122795 (JP, A) JP-A-62-111297 (JP, A) 136373 (JP, U) JP 49-44147 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) B66D 3/20 B66D 3/24

Claims (2)

(57) [Claims] 1. An upper idler sheave mounted on an upper support frame, and first and second electric chain blocks fixed on both sides thereof, and first and second lower parts on both sides of a lifting frame supporting a lower hook. An idler sheave is mounted, and one load chain is suspended over the first and second lower idler sheaves, the respective loader sheaves of the first and second electric chain blocks, and the upper idler sheave. In the double-drive electric chain block, in conjunction with the rotation of the upper idle wheel, when the load wheel flows to the first idle wheel side, the count is subtracted or added, and the second idle wheel side is counted. If the count value of the rotary encoder becomes a predetermined value in the minus or plus direction, the first or the second is added. Wherein the operation of any one of the electric chain blocks is stopped, and a load chain piece flow adjusting means for correcting the flow of the load chain until the count value of the rotary encoder becomes 0 or a predetermined value or less is provided. Double drive electric chain block. 2. An emergency load chain piece flow detecting means, which is activated when the load chain flow adjusting means does not operate for some reason and when the load flow of the load chain exceeds a predetermined value, is provided. When the load piece flow detecting means is operated, the operation of the first or second electric chain block is stopped, and an emergency load piece flow adjusting means for correcting the piece flow of the load is provided. The double drive electric chain block according to claim 1.