JPH0133434B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric chain block, in particular, a load sheave driven by a motor is rotatably mounted between a pair of side plates facing each other at a predetermined interval. This invention relates to an electric chain block equipped with a chain holder for a chain to be wound.

Conventionally, this type of electric chain block has a chain holder fixed to a side plate, and an operator placed below the chain holder so that it can move up and down.The operator is activated by upward movement of the end of the chain. A limit switch for stopping the motor driving the chain is turned off via the limit lever.

In this way, since the chain presser and the operator are provided in the vertical direction, the external dimensions in the vertical direction become larger, and the distance between the upper hook and the lower hook when located at the upper limit position becomes larger. There is a problem in that the lifting distance is shortened, and in addition to the operator, a spring and a mounting bolt for the operator are required in order to operate the limit switch, resulting in an increase in the number of parts. In addition, during operation, foreign matter such as dirt may enter the chain holder through the chain, or the chains may rub against each other and generate heat, resulting in a state where the chains run out of oil and remain stuck together in the chain holder. If the chain gets stuck in the chain, the limit switch cannot be operated at all, and there is a problem in that the chain holder is destroyed by the chain.

However, in view of the above problems, the applicant first supported the chain holder on the side plate so that it could swing freely, and provided the chain holder with a spring that biased the chain holder toward the neutral position. He solved the above-mentioned problems by inventing an electric chain block in which a limit switch for stopping the motor that drives the chain is activated by the deviation of the chain holder from the neutral position.

The present invention provides an electric chain block as described above, in which when the spring breaks, the spring can be replaced without disassembling the entire chain block, and the replacement work can be performed extremely easily and quickly. It is an object of the present invention to provide an electric chain block that allows inspection of a spring and a guide roller for guiding a chain in a chain holder at the same time.

That is, in the present invention, a chain holder is supported on the side plate so as to be able to swing freely, and a support member that rotatably supports a guide roller is detachably attached to the chain holder, and the chain is loaded by the guide roller. a neutral holder is removably attached to an outer position of the support member between the side plates;
A spring that engages with the holding body and urges the chain holder toward a neutral position is attached to the support member, and a limit switch for stopping the motor when the chain holder is displaced from the neutral position is attached to the chain holder. It is characterized by providing an actuation means for actuation.

Embodiments of the electric chain block of the present invention will be described below with reference to the drawings.

The illustrated chain block has bearing frames 3, 3 provided at the center of a pair of side plates 1, 2 facing each other at a predetermined interval.
The load sheave 5 is rotatably supported via bearings 4, 4 between them, and the side plates 1, 2
A motor 6, a motor cover 61, and a motor brake 7 are provided on the outside of the side plate 1 on one side, and a reduction gear mechanism 8 and a gear cover 9 are provided on the outside of the side plate 2 on the other side. An input shaft 11 passing through the load sheave 5 is rotatably supported between the frame 3 and the gear cover 9 via bearings 10, 10.
1 and the output shaft 62 of the motor 6 are arranged in series, one end side of the input shaft 11 and the output shaft 62 are opposed to each other, and the transmission cylinder 12 is provided between these opposing parts. The rotation of the transmission cylinder 12,
The signal is transmitted to the load sheave 5 via the input shaft 11 and the reduction gear mechanism 8.

Therefore, in the chain block constructed as described above, the chain presser 20 of the chain C wound around the load sheave 5 is connected to the side plate 1,
In order to guide the chain C to the load sheave 5 by the guide roller 14, a supporting member 13 is removably attached to the chain presser 20 to freely swing and support the chain C to the load sheave 5. On the other hand, the side plates 1 and 2
A neutral holder 1 is placed at an outer position of the support member 13 between the
8 is removably attached, and the support member 1
3, the chain presser 20 is engaged with the holding body 18.
A spring 15 is attached to urge the chain holder 20 toward the neutral position, and an actuating means 30 is provided on the chain holder 20 to actuate a limit switch 16 for stopping the motor when the chain holder 20 deviates from the neutral position.

The chain presser 20 has an upward circular downward shape when viewed from the front surface in FIG. 2, and has through holes 21 formed from the front surface to the back surface, and communicates with the through holes 21 from both ends in the width direction of the lower surface of the chain presser 20, respectively. Chain C
guide holes 22a, 22b, and both guide holes 22
A chain holding groove 23 is formed which connects a and 22b and inverts the chain C into an inverted U shape.

As shown in FIG. 3, the guide holes 22a and 22b are formed to have a cross-shaped cross section so as to be able to guide the vertical portion _C1 and the horizontal portion _C2 of the chain C. A chain C having a lower hook (not shown) is guided, and a chain C communicating with a chain bag (not shown) is guided through the guide hole 22b.

Further, the holding groove 23 is formed on the sideways portion of the chain C.
One side of _C2 is formed into a bowl-shaped cross section so that it can be held down in a gripping manner.

Furthermore, a through hole 24 into which the guide roller 14 can be inserted is provided on one side of the chain presser 20, and a recess 25 is provided on the upper portion of the other side.

Then, the chain presser 20 formed as above
When installing between side plates 1 and 2,
The inner ends of the bearing frames 3, 3 fixed to the side plates 1, 2 are made to protrude inwardly from the side plates 1, 2 to form cylindrical support parts 3a, 3b, and both of these support parts 3a, 3b with chain presser 20
When the chain C is hoisted and operated, a stop member (not shown) attached to the upper part of the lower hook pushes up the edge of the guide hole 22a on the lower surface of the chain presser 20. When the chain C is rotated clockwise and the chain C is lowered, a stop member (not shown) attached to the lower end of the chain C stored in the chain bag presses the edge of the guide hole 22b on the lower surface of the chain presser 20. By raising it, it is made to rotate counterclockwise.

Further, the support member 13 has a frame shape, and rotatably supports a guide roller 14, which has a guide groove 14a of a chain C formed around a pair of side walls 13a, 13a facing each other, via a shaft 14a. A cylindrical protrusion 13 is provided on the outer surface of the side walls 13a, 13a.
b, 13b, and protrusions 13c, 13c are provided at lateral positions of each of these protrusions 13b, 13b, and the guide roller 14 is held by a chain presser 20.
The support member 13 is inserted into the through hole 24 of the guide roller 14, and the support member 13 is removably attached to the chain presser 20 with bolts 17, 17, and the guide groove 14 of the guide roller 14 is inserted.
I am trying to guide Chien C by doing a.

The springs 15, 15 that bias the chain presser 20 are made of a series of bullet wire members, and include a coil portion and two end wire portions extending outward in the radial direction of the coil from both ends of the coil portion. It was formed. When installing this spring 15, a neutral holding body 18 having a neutral holding piece 18a is arranged on the side of the protrusions 13c, 13c in the neutral position of the chain presser 20,
The holding body 18 is attached to the side plates 1 and 2 by bolts 1.
9 and 19, it is removably attached.

The springs 15, 15 are attached such that the protrusion 13b of the support member 13 is fitted into the coil part, and the pair of end wire parts rub against the protrusion 13c and the holding piece 18a with a constant clamping force, and the chain presser 20 is always energized toward the neutral position.

As described above, the limit switch 16 is activated by detecting the amount of deviation when the chain presser 20 is deviated from the neutral position by a certain angle, for example, 8 degrees or more. An actuation means 30 for actuation is provided.

The operating means 30 includes a rack 31 provided at the lower part of the chain presser 20, a pinion 32 meshed with the rack 31, and an operating shaft 33 connected from the pinion 32 to the limit switch 16.

By the way, the limit switch 16 is of a rotary type and uses a double-pole, single-throw type first switch _S1 and second switch _S2 , and when the chain presser 20 is located at the neutral position in FIG. When both switches S ₁ and S ₂ are held in the ON state and the chain presser 20 deviates by a certain angle clockwise in FIG. 2, the deviation is transmitted to the operating shaft 33 and only the first switch S ₁ is turned OFF. When the chain presser 20 is actuated and the chain presser 20 deviates by a certain angle in the counterclockwise direction in FIG. 2, the deviation is transmitted to the operating shaft 33 to turn off only the second switch _S2 .

Incidentally, although not shown, the first and second switches S ₁ and S ₂ are connected to two lines of one type of combination among the three lines connected to the motor 6 from the three-phase power supply. Connect the first switch S ₁ in series with the upper contact, and connect the second switch S ₂ in series with the lower contact to two different types of lines of different combinations among the three lines. It is.

A stopper 26 restricts the swinging of the chain holder 20, and extends through the recess 25 of the chain holder 20 and is installed between the side plates 1 and 2.

However, in the above configuration, the motor 6
When the chain C is hoisted or hoisted by rotating forward or reverse, the chain C is smoothly guided through the guide holes 22a, 22b and the guide groove 23 in the chain presser 20. During steady operation, the chain presser 20 No rocking force acts on the chain presser 20, and the spring 1
5, it is held at the neutral position and steady operation is continued.

However, if a foreign object such as mud adheres to the chain C and enters the chain holder 20, causing an abnormal situation in which the resistance to the movement of the chain C exceeds a certain value, the chain holder 20 The limit switch 16 is rotated clockwise or counterclockwise depending on the up operation or the down operation, and the first switch _S1 or the second switch of the limit switch 16 is rotated by the operating means 30.
_S2 is activated and the motor 6 is stopped, thereby reliably preventing the motor 6 from burning out. In addition, as the above-mentioned abnormal situation, the vertical part of chain C
C ₁ and the sideways portion C ₂ strongly rub against each other, generate heat, run out of oil, grow rust, and become attached to each other in a straight line, causing the chain presser 2
Even if an abnormal situation occurs in which the chain is introduced into the guide hole 22a or 22b, the rotational force acts on the chain presser 20 and the limit switch 16 is activated, so that the motor 6 can be stopped immediately. In short, during steady operation, if a foreign object occurs that causes the chain C conducting in the chain holder 20 to receive continuity resistance above a certain level, the chain holder 20 is rotated by the rotational force due to the continuity resistance, and the limit switch 16 is activated via the actuating means 30. is activated, and the motor 6 can be stopped immediately.

Further, when the chain C is hoisted and the stop member provided on the upper part of the lower hook comes into contact with the edge of the guide hole 22a on the lower surface of the chain presser 20, the chain presser 20 is rotated clockwise and the operating means 30 is rotated clockwise.
As a result, the first switch _S1 of the limit switch 16 is turned off, the motor 6 is stopped, and the hoisting operation can be stopped.

In addition, when the chain C is lowered, the stop member housed in the chain bag is moved to the chain presser 20.
When it comes into contact with the edge of the guide hole 22b on the lower surface, the chain presser 20 is rotated counterclockwise, the second switch _S2 of the limit switch 16 is turned off by the operating means 30, and the motor 6 is stopped.
This allows the hoisting operation to be stopped.

However, if the spring 15 that urges the chain presser 20 toward the neutral position, which operates as described above, is damaged and needs to be replaced, first remove the mounting bolts 19, 19 from the side plates 1, 2. to take out the neutral holder 18 from between the side plates 1 and 2, and then remove the neutral holder 18 from between the side plates 1 and 2.
Loosen the fixing bolts 17, 17 by using the space formed on the sides of the chain holder 2, and
0, take it outside, and replace the damaged spring 15. Therefore, spring 1 can be removed without disassembling the entire chain block.
5 can be replaced, and the work can be done easily and quickly. Further, the spring 15 and guide roller 14 can be inspected at the same time by the same operation as the time of replacement.

In addition, in the above embodiment, the side wall 13 of the support member 13
Although the protrusions 13b and 13b provided on the guide rollers 13a and 13a are formed by protruding the bearing portion of the guide roller 14 outward, they may be formed separately from the bearing portion of the guide roller 14 as shown in FIG. In this case, the protrusion 13b is placed on the outer side of the side wall 13a, that is, on the holder 18.
If provided on the side, there is no need to insert the protrusion 13b and spring 15 into the through hole 24 of the chain presser 20, and the through hole 24 can be made smaller. It can also be attached to a chain block.

Further, the actuating means 30 is not limited to the structure of the embodiment, and various means for detecting the swinging of the chain presser 20 and actuating the limit switch 16 may be used.

The above explanation is based on the motor 6 being connected to the load sheave 5.
It goes without saying that the present invention is applicable to various types of electric chain blocks such as those disposed above the load sheave 5.

As described above, in the present invention, a chain holder is supported on the side plate so as to be able to swing freely, and a support member that rotatably supports a guide roller is detachably attached to the chain holder, so that the chain holder is supported by the guide roller. A neutral holder is removably attached to an outer position of the support member between the side plates, and is engaged with the holder to move the chain presser to the neutral position. Since a spring is attached to the chain holder and an actuating means is provided on the chain holder to operate a limit switch for stopping the motor when the chain holder deviates from the neutral position, an operator etc. is installed below the chain holder. As a result, the distance between the upper hook and the lower hook when it is at the upper limit position can be reduced, and while the lifting distance by the lower hook can be increased, the lifting and lowering of the chain can be easily performed. At the end of the operation, the stop member attached to the end of the chain comes into contact with the chain holder, which rotates the chain holder, and this rotation operates the limit switch to reliably stop the motor. If an abnormal situation occurs, such as foreign matter such as mud getting in, or the chains becoming heated due to friction, running out of oil, and entering the chain presser while stuck together, the chain presser will not rotate. The limit switch is activated, the motor can be stopped reliably, and motor burnout accidents can be reliably prevented.

Moreover, a support member for supporting the guide roller is removably attached to the chain holder, and a spring is attached to the support member, while a neutral holder that engages with the spring and holds the chain holder at a neutral position is mounted on the side. Since it is removably attached between the plates, if the spring breaks and needs to be replaced, for example, the space between the side plates can be easily reassembled without having to take the trouble of disassembling the chain block body. First, the neutral holding body can be removed from the side plate using the part, and then the support member can be removed from the chain presser, and the spring can be taken out together with the support member, so that even if the spring is damaged, the spring can be removed. The replacement work can be carried out easily and quickly.Furthermore, since the guide roller is supported by the support member, it is possible to not only replace the spring but also replace or repair/inspect both the spring and the guide roller at the same time. It can be done.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional plan view thereof, FIG. 2 is a partially omitted sectional side view taken along line A-A, and FIG. 3 is a bottom view of the chain presser, and the fourth and fifth
The figure is an explanatory diagram of a guide roller support member, and FIG. 6 is an explanatory diagram showing another embodiment of the support member. 1, 2...Side plate, 5...Load sheave, 6...Motor, 13...Support member, 14...
Guide roller, 15... Spring, 16... Limit switch, 20... Chain holder, C... Chain.

Claims (1)

[Claims] 1. An electric chain block in which a load sheave driven by a motor is rotatably mounted between a pair of side plates facing each other at a predetermined interval, and a chain holder is provided to be wound around the load sheave, The chain holder is swingably supported on the side plate, and a support member that rotatably supports a guide roller is detachably attached to the chain holder, and the chain is guided to the load sheave by the guide roller. At the same time, a neutral holding body is removably attached to an outer position of the supporting member between the side plates,
A spring that engages with the holding body and urges the chain holder toward a neutral position is attached to the support member, and a limit switch for stopping the motor when the chain holder is displaced from the neutral position is attached to the chain holder. An electric chain block characterized by being provided with an actuation means for actuation.