WO2024048403A1

WO2024048403A1 - Electric chain block

Info

Publication number: WO2024048403A1
Application number: PCT/JP2023/030422
Authority: WO
Inventors: 京介山野
Original assignee: 株式会社日立産機システム
Priority date: 2022-09-02
Filing date: 2023-08-24
Publication date: 2024-03-07

Abstract

Provided is an electric chain block that can correspond to an installation environment in which a short closeness dimension is required from one chain bucket and to an action environment in which the chain bucket and a load interfere with one another.　In the present invention, a chain bucket comprising a fixed part that is attached and fixed to a chain block body and a storage part that stores a load chain is attached to the chain block body in a first attachment state in which a closeness dimension is short in lieu of the vertical-direction height of the bottom surface of the chain bucket from a floor surface being low. Additionally, in a state in which the chain bucket is rotated 180° from the first attachment state about the fixed part, the chain bucket is attached in a second attachment state in which the vertical-direction height of the bottom surface of the chain bucket from the floor surface is high in lieu of the closeness dimension being long.

Description

electric chain hoist

The present invention relates to a chain hoist for hoisting and moving a suspended load, and particularly to an electric chain hoist using an electric motor.

In an electric chain hoist, a load chain is attached to a hanging tool (hanging hook) on which a sling wire is hung, and a sprocket rotated by an electric motor winds up the load chain to lift a suspended load in the vertical direction. The wound load chain is stored in a chain bucket, and when a suspended load is to be lowered, the sprocket is rotated in the opposite direction to let out the load chain from the chain bucket.

As described above, the electric chain hoist requires a chain bucket to store the load chain that is discharged to the side opposite to the suspended load. The depth of the bottom of the chain bucket is roughly determined by the capacity of the load chain to be stored, but depending on the environment in which it is used, such as the tension of the sling wire and the size of the suspended load, the lifting device may reach its maximum lift. The suspended load and the chain bucket may interfere with each other before the lifting of the suspended load, resulting in the inconvenience that the suspended load cannot be hoisted up to its maximum lifting height.

In order to take measures against such problems, for example, Japanese Patent Application Laid-Open No. 61-192699 (Patent Document 1) discloses the following electric chain hoist. In Patent Document 1, the length of the chain bucket in the depth direction is shortened as much as possible, and the bottom surface of the chain bucket is raised to prevent the slinging equipment and the suspended load from getting in the way when hoisting is at its limit, and to prevent the suspended load from getting in the way. An electric chain hoist is shown that prevents the chain from being pushed up into the bucket by the operator.

Japanese Unexamined Patent Publication No. 1986-192699

By the way, in the electric chain hoist shown in Patent Document 1, the chain bucket is inflated outward in order to shorten the length of the chain bucket in the depth direction and store a specified amount of load chain. Therefore, the dimension from the center to the outermost surface of the chain hoist (hereinafter referred to as the offset dimension) becomes large, making it unsuitable for installation environments that require a short offset dimension.

On the other hand, in order to accommodate the short offset dimension, the length of the chain bucket in the depth direction must be increased in order to accommodate a specified amount of load chain. If such a configuration is adopted, an operating environment arises in which the suspended load and the chain bucket interfere with each other, making it impossible to hoist the suspended load to the maximum lifting height.

Therefore, it was necessary to prepare individual chain buckets that could handle each environment. However, preparing individual chain buckets in this way is not realistic from a production standpoint, and being compatible with existing electric chain hoists is also an important condition.

An object of the present invention is to provide an electric chain hoist that can be used in an installation environment where a short side length is required and an operating environment where the chain bucket and suspended load interfere with each other using a single chain bucket.

The present invention provides a chain bucket consisting of a fixed part that is attached and fixed to the chain block main body and a storage part that stores the load chain. , a first installation form with a shorter offset dimension, or (2) an alternative with a larger offset dimension when rotated 180 degrees around the axis from the open end of the chain bucket toward the bottom surface compared to the first installation format. The present invention is characterized in that it can be attached to the chain block main body in either of the following attachment modes, in which the length in the vertical direction from the bottom of the chain bucket to the floor is longer.

According to the present invention, a single chain bucket can be used in an installation environment where short side dimensions are required and an operating environment where the chain bucket and suspended load interfere with each other.

FIG. 2 is a configuration diagram showing a side surface and a top surface of a chain bucket applied to the electric chain hoist according to the present invention. FIG. 2 is a front view showing the front of the chain bucket shown in FIG. 1 in a first attachment form. 2 is a rear view showing the back of the chain bucket shown in FIG. 1. FIG. FIG. 2 is a front view showing the front of the chain bucket shown in FIG. 1 in a second attachment form. FIG. 2 is a front view of an electric chain hoist with a chain bucket attached in a first attachment mode. FIG. 3 is a front view of an electric chain hoist with a chain bucket attached in a second attachment mode. It is a front view of a general electric chain hoist. It is a side view of a general electric chain hoist seen from the side. FIG. 2 is a control circuit diagram of a control section of a general electric chain hoist.

Hereinafter, embodiments of the present invention will be described in detail using drawings, but the present invention is not limited to the following embodiments, and various modifications and applications can be made within the technical concept of the present invention. is also included within the scope.

Before describing the embodiment of the present invention, a general electric chain hoist will be explained, and then the present embodiment will be explained. FIG. 5 shows a front view of the electric chain hoist, FIG. 6 shows a side view of the electric chain hoist, and FIG. 7 shows a control circuit of a control section of the electric chain hoist.

The overall configuration and operating principle of the electric chain hoist will be briefly explained using FIGS. 5 to 7.

As shown in FIGS. 5 and 6, the electric chain hoist 100 includes an electric motor 1, a reduction unit 2, an electromagnetic brake 3, a lifting device 4, an operation input device 5, a chain bucket 6, a sprocket 7, a hanging device 8, and many others. It has a load chain 9 formed by connecting link pieces, and a control section 10 (see FIG. 7). The electric chain hoist 100 is attached with a lifting tool 4 for hanging the electric chain hoist 100 from a beam of a building or the like.

Furthermore, an electric motor 1 is attached to the electric chain hoist 100, and the electric motor 1 hoists up a hanging device (load block) 8 for suspending a suspended load via a load chain 9. A deceleration section 2 for decelerating the rotation generated by the electric motor 1 is connected to the electric motor 1 .

The rotational force of the electric motor 1 decelerated by the deceleration unit 2 is transmitted to the sprocket 7. An electromagnetic brake 3 is attached to the electric motor 1 to stop the rotation generated by the electric motor 1. A load chain 9 is engaged with the sprocket 7. Furthermore, a control unit 10 (see FIG. 7) that controls the operation of the electric motor 1 and the electromagnetic brake 3 is attached to the electric chain hoist 100.

Next, the operating principle of the electric chain hoist 100 will be explained using FIGS. 5 to 7. As shown in FIG. 7, the control unit 10 of the hoisting machine is provided with a male power connector 12 that connects to a female power connector 11, and power is supplied to the control unit 10. A power cable 15 is connected to the power female connector 11.

The control unit 10 is also provided with a male operation connector 14 that connects to the female operation connector 13 of the operation input device 5, and operation information of the operation input device 5 is input to the control unit 10. An operation cable 16 is connected to the operation female connector 13. The female power connector 11 and the male power connector 12, and the female operation connector 13 and the male operation connector 14 are each detachable.

In the circuit configuration as described above, for example, when the upper operation button of the operation input device 5 is pushed in, the magnetic contactor (coil) 23 By being energized, the electromagnetic contactor (contact) 24 is closed, and the electric motor 1 is energized through the contact of the overwinding prevention device 25. At the same time as the electric motor 1 is energized, the electromagnetic brake 3 is also energized, the electromagnetic brake 3 is released, and the electric motor 1 starts rotating.

The rotational power of the electric motor 1 is reduced to a predetermined rotational speed by the reduction unit 2, and the rotation is transmitted to the load chain 9 by the sprocket 7 connected to the final reduction stage, and the lowering tool 8 is hoisted through the load chain 9. , or lowering the suspended load.

The main body of the electric chain hoist 100 is provided with a chain bucket 6 that stores a load chain 9 and is suspended from a chain 17. When the load lock 8 is hoisted up, the load chain 9 on the opposite side to the lower suspension tool 8 is stored in the chain bucket 6, and when the lower suspension tool 8 is lowered, the load chain 9 on the opposite side to the lower suspension tool 8 is stored in the chain bucket 6. A load chain 9 on the opposite side to 8 is discharged from the chain bucket 6.

By the way, in such an electric chain hoist, as described in Patent Document 1, in order to shorten the length of the chain bucket in the depth direction and store a specified amount of load chain, the chain bucket is turned outward. It's inflated. For this reason, the offset dimension, which is the dimension from the center of the chain block to the outermost surface, becomes large, and there is a problem that it is not suitable for an installation environment where a short offset dimension is required.

On the other hand, in order to accommodate the short offset dimension, the length of the chain bucket in the depth direction must be increased so that a specified amount of load chain can be accommodated. If such a configuration is adopted, an operating environment arises in which the suspended load and the chain bucket interfere with each other, making it impossible to hoist the suspended load to the maximum lifting height.

Therefore, it was necessary to prepare individual chain buckets that could handle each environment. However, preparing individual chain buckets in this way is not realistic from a production standpoint. Another important condition is that it can be used with existing electric chain hoists.

Therefore, in this embodiment, we propose an electric chain hoist that can cope with an installation environment where a short side dimension is required and an operating environment where the chain bucket and suspended load interfere with each other with a single chain bucket.

In this embodiment, the structure of the chain bucket consists of a fixed part that is attached and fixed to the chain block main body, and a storage part that stores the load chain that is integrally formed with this fixed part. This is different from the hanging structure using chains.

Then, the chain bucket is attached to the chain block main body in a first attachment mode in which the vertical length from the bottom surface of the chain bucket to the floor surface is short, but the offset dimension is short.

Separately, in contrast to the first mounting configuration, when rotated 180 degrees around the axis from the open end of the chain bucket to the bottom, the offset dimension is larger, but from the bottom of the chain bucket to the floor. It is attached to the chain block main body in a second attachment form in which the length in the vertical direction is longer.

As a result, one chain bucket can be used in installation environments that require short side dimensions and in operating environments where the chain bucket and suspended load interfere with each other.

Hereinafter, the configuration of the electric chain hoist according to this embodiment will be explained based on FIGS. 1 to 4. The electric chain hoist according to the embodiment is characterized by being equipped with a reversible chain bucket 30.

FIG. 1 shows a reversible chain bucket (hereinafter simply referred to as chain bucket) 30, and this chain bucket 30 consists of a box-shaped chain storage section 31 and a pair of fixing sections 32. When viewed with the chain bucket 30 attached to the chain block main body, the chain storage section 31 is formed into a box-like shape having an opening 33 at the upper end through which the chain enters and exits. Therefore, the opposite side of the opening 33 becomes the bottom surface.

Furthermore, a pair of fixing parts 32 are formed on the side of the opening 33, and these fixing parts 32 are bolted to a pair of mounting flanges 36 (see FIG. 3) formed on the chain block main body, which will be described later. It is something that For this reason, the pair of fixing parts 32 are formed with attachment through holes 32h-1, 32h-2, and 32i. The chain storage section 31 and the fixing section 32 are integrally molded from synthetic resin.

Furthermore, this chain bucket 30 is sized so that it can be attached to an existing electric chain hoist. That is, since the electric chain block has a mounting flange 36 formed on the chain block main body, the fixing portion 32 is dimensioned so as to be attached to this mounting flange 36.

FIGS. 2A and 2B show the surface of the chain bucket 30 viewed from a direction perpendicular to the direction in which the pair of fixing parts 32 are arranged, and FIG. 2A shows the surface of the chain bucket 30 when it is attached in the "first attachment mode". FIG. 2B shows the "Side B" side of FIG. 1 when attached in the "second attachment mode". In other words, if "side A" is the front side, "side B" is the back side.

FIGS. 2A and 2B are views of the chain block main body 35 when viewed from the same direction. As can be seen from this, the chain bucket 30 in the mounting configuration shown in FIG. 2A is mounted in a state rotated by 180 degrees around the axis "C" extending from the open end 33 of the chain bucket 30 toward the bottom surface 34, as shown in FIG. 2B. It is. Note that the axis "C" is an axis passing through the center of the top and bottom surfaces of the opening 33 of the chain bucket 30.

Mounting through holes 32h-1, 32h-2, and 32i are formed in the pair of fixing parts 32, and as shown in FIG. A fixing bolt for fixing to the mounting flange 36 is inserted therethrough.

Here, the distance (pitch) between the centers of the attachment through hole 32h-1 and the attachment through hole 32h-2 is the same as the distance (pitch) between the centers of the attachment through hole 32h-2 and the attachment through hole 32i. be. Furthermore, the distance (pitch) between the centers of the two mounting holes provided in the mounting flange 36 is also the same. Therefore, the chain bucket 30 can be fixed to the mounting flange 36 by inserting and fixing these fixing bolts.

In this case, the mounting form is a "first mounting form" where the mounting through hole 32h-1 and the mounting through hole 32h-2 shown in FIG. 2A are used for fixing, and the mounting through hole 32i is a waste hole. . Here, a line segment connecting the centers of the attachment through hole 32h-1 and the attachment through hole 32h-2 is perpendicular to the axis of the chain bucket 30.

Therefore, when the chain bucket 30 is attached so that its axis coincides with the direction of gravity, the line segment connecting the centers of the attachment through hole 32h-1 and the attachment through hole 32h-2 has a horizontal positional relationship. This "first attachment form" is an attachment state in which the deviation dimension is the minimum.

Furthermore, as shown in FIGS. 2B and 2C, the case of fixing using the attachment through hole 32h-2 and the attachment through hole 32i is the "second attachment form", and the attachment through hole 32h-1 is used as a waste hole. Become. The actual mounting state will be at an angle as shown in FIG. 2C.

Here, a line segment connecting the centers of the attachment through hole 32h-1 and the attachment through hole 32h-2 and a line segment connecting the centers of the attachment through hole 32h-2 and the attachment through hole 32i form a predetermined angle θ. It is formed with

In other words, if a line segment connecting the centers of the through hole 32h-1 and the attachment through hole 32h-2 is set in the horizontal direction so that the bottom surface of the chain bucket 30 is on the lower side in the direction of gravity, the attachment through hole 32i is , is located below the line segment connecting the centers of the attachment through hole 32h-1 and the attachment through hole 32h-2.

This makes it possible to change the height of the chain bucket 30 from the floor. Incidentally, the pair of fixing parts 32 are formed with attachment through holes 32h-1, 32h-2, and 32i at the same position so that fixing bolts can be inserted therethrough.

Next, the form in which the chain bucket 30 is attached to the chain block body will be described with reference to FIG. 3.

A mounting flange 36 is formed on the side surface of the chain block main body, and the fixing portion 32 of the chain bucket 30 is fixed to this mounting flange 36 with a fixing bolt. The fixing bolt cooperates with the mounting flange 36 to sandwich the fixing portion 32 to fix the chain bucket 30.

In this way, the fixed parts 32 of the chain bucket 30 are a pair of fixed parts 32, and the pair of fixed parts 32 are fixed to the flat mounting flanges 36 formed on the chain block main body 31 with fixing bolts. There is. Since this mounting flange 36 is also formed on an existing electric chain hoist, it is easy to fix the fixing portion 32 of the chain bucket 30 to the mounting flange 36 with fixing bolts.

Next, the first attachment form will be explained. FIG. 3 shows a "first mounting form", and this mounting form is a form used in an environment where a short offset dimension is required.

In order to shorten the offset dimension, it is necessary to bring the outermost shape of the chain bucket 30 as close to the chain block body as possible, and to arrange the chain bucket 30 so that it stands upright on the floor. In order to achieve such a mounting state, the chain bucket 30 may be fixed with fixing bolts using the mounting through holes 302h-1 and 32h-2 formed in the fixing portion 32 of the chain bucket 30. In this state, the vertical length from the bottom surface 34 of the chain bucket 30 to the floor (not shown) is short, but the offset dimension is short.

Next, the second attachment form will be explained. FIG. 4 shows a "second mounting form", and this mounting form is used in an environment where there is no restriction on offset dimensions and a maximum lift is required.

In order to ensure the maximum lifting height without having much restriction on the offset dimension, the chain bucket 30 may be installed so as to be inclined in the direction away from the chain block main body 31. In order to achieve such a mounting state, the chain bucket 30 may be fixed with a fixing bolt using the mounting through hole 302h-1 and the mounting through hole 32i formed in the fixing part 32.

In this state, there is no restriction on the offset dimension, and the vertical length from the bottom surface 34 of the chain bucket 30 to the floor surface (not shown) is long. This "second attachment form" is an attachment state in which the lifting height of the lower hanging tool is the maximum lifting height, and the chain bucket 30 does not interfere with the sling wire SW of the suspended load SL.

The fixing part 32 of the chain bucket 30 is formed with at least a first attachment through hole 32h-1, a second attachment through hole 32h-2, and a third attachment through hole 32i. A line segment connecting the centers of the second attachment through hole 32h-1 and the second attachment through hole 32h-2 is provided to be orthogonal to the axis (C) of the chain bucket 30. Also. A line segment connecting the centers of the third attachment through hole 32i and the second attachment through hole 32h-2 is provided at a predetermined angle with the axis (C) of the chain bucket 30.

In the first attachment form, it is fixed to the attachment flange 36 of the chain block main body 31 using the first attachment through hole 32h-1 and the second attachment through hole 32h-2. Furthermore, in the second attachment form, it is fixed to the attachment flange 36 of the chain block main body 31 using the third attachment through hole 32i and the second attachment through hole 32h-2.

In this way, in an environment where a suspended load is not hoisted up to its maximum lifting height, by installing the chain bucket 30 in the form shown in Figure 3, it is possible to minimize the offset dimension and prevent the electric chain hoist from getting in the way of other equipment or obstacles. It is possible to avoid interference.

On the other hand, in an environment where a suspended load is hoisted up to its maximum lifting height, by attaching the chain bucket 30 in the form shown in FIG. 4, it is possible to hoist and transport the suspended load to its maximum hoisting height.

Furthermore, the chain bucket 30 can be easily retrofitted even to an electric chain hoist equipped with an existing mounting flange.

Note that the present invention is not limited to the few embodiments described above, and includes various modifications. The above-described embodiments have been described in detail to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to having all the configurations described. Furthermore, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to add, delete, or replace other configurations with respect to the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 1...Electric motor, 2...Reduction part, 3...Electromagnetic brake, 4...Upper lifting tool, 5...Operation input device, 6...Chain bucket, 7...Sprocket, 8...Lower lifting tool, 9...Load chain, 10...Control unit , 11...Power cable, 12...Operation cable, 21...Step-down transformer, 22...Overwinding prevention device, 23...Magnetic contactor (coil), 24...Magnetic contactor (contact), 30...Reversible chain bucket, 31...Chain Storage part, 32... Fixed part, 32h-1, 32h-2... Attachment through hole, 32i... Attachment through hole, 36... Attachment flange, 100... Electric chain hoist.

Claims

A chain block main body on which a sprocket rotatably driven by an electric motor is rotatably mounted, a load chain formed by connecting a number of link pieces and having a hanging tool provided at one end and stretched around the sprocket, and the load chain. An electric chain block that is equipped with a chain bucket attached to a mounting flange of the chain block main body that accommodates the other end of the chain, and that hoists and lowers a suspended load attached to the hanging tool,
The chain bucket includes a fixing part that is attached and fixed to the chain block main body, and a storage part that stores the load chain, and the chain bucket includes:
A first attachment mode in which the vertical length from the bottom surface of the chain bucket to the floor surface is short and the offset dimension is short; or A second attachment form in which the length of the chain bucket in the vertical direction from the bottom surface to the floor surface is longer in place of the larger offset dimension when the chain bucket is rotated 180 degrees about the axis toward the bottom surface;
An electric chain hoist, characterized in that it is attached to the chain hoist body in any of the following attachment forms.
The electric chain hoist according to claim 1,
The electric chain hoist is characterized in that the first attachment form is an attachment state in which the offset dimension is minimized.
The electric chain hoist according to claim 1,
The electric chain hoist is characterized in that the second attachment mode is an attachment condition in which the chain bucket does not interfere with the sling wire of the suspended load when the lower lifting device has a maximum lifting height.
The electric chain hoist according to claim 1,
An electric chain hoist, wherein the fixing part of the chain bucket can be attached to a mounting flange of the chain block main body of an existing electric chain hoist.
The electric chain hoist according to claim 1,
The fixing part of the chain bucket is formed with a plurality of attachment through holes,
In the first attachment form, the chain block body is fixed by inserting fixing bolts into the pair of attachment holes of the attachment flange of the chain block body using the pair of attachment through holes,
In the second attachment form, the chain block body is fixed by inserting fixing bolts into the pair of attachment holes of the attachment flange of the chain block main body using the other pair of attachment through holes. chain block.
The electric chain hoist according to claim 5,
The fixing portion of the chain block main body is formed with at least a first attachment through hole, a second attachment through hole, and a third attachment through hole, and the first attachment through hole and the second attachment through hole are formed. A line segment connecting the centers of the attachment through holes is provided in a form perpendicular to the axis of the chain bucket, and connects the third attachment through hole, the first attachment through hole, or the second attachment through hole. A line segment connecting the centers is provided at a predetermined angle with the axis of the chain bucket,
In the first attachment form, it is fixed to the chain block main body using the first attachment through hole and the second attachment through hole,
In the second attachment form, the electric wire is fixed to the chain block main body using the third attachment through hole and the first attachment through hole, or the second attachment through hole. chain block.
The electric chain hoist according to claim 6,
The fixing parts of the chain bucket are a pair of fixing parts, and the pair of fixing parts are fixed to the flat mounting flange formed on the chain block main body by the fixing bolts. Electric chain hoist.