JPH0950896A - Electrostatic eliminater and electrostatic eliminating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely and easily eliminate static electricity from a chargeable carriage material. SOLUTION: This is a device 10 for eliminating static electricity from a chargeable carriage material 40 carried in such a state as suspended by a suspension tool 30 of a carrier (H). It is provided with a conductive fitting part 12, a conductive string body 14, and a conductive contact part 18. The conductive fitting part 12 is fitted to a conductive part of the suspension tool 30. The conductive string body 14 has one end coupled with the conductive fitting part 12 and the other end hung in the side direction of the chargeable carriage material 40. The conductive contact part 18 is arranged in the other side of the conductive string body 14 and abuts on the outer face of the chargeable carriage material 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static eliminator and a static eliminator, and more particularly, to a device and a method for removing the static charge of a chargeable carrier that is hung and carried by a hanging tool of a carrier.

[0002]

2. Description of the Related Art Many powders of plastics are easily charged, and there is also a material which may ignite or explode due to sparks when accumulated static electricity is discharged. The same problem may occur not only with plastics but also with various chemicals and industrial raw materials. In particular, it is very dangerous to put powder that is still charged into a flammable liquid, and there are many cases of accidents of flammable explosion.

[0003] In order to handle the powder and granules easily, the powder and granules are stored in a container bag, and the container bag is hung and conveyed by a hoist or a hook of a traveling crane. However, when the electrostatically-charged powder and granules are housed in a container bag, if the electrostatically-charged powder and granules are brought into frictional contact with each other due to vibration or shaking during transportation, the charging easily occurs. Moreover, since there is no place where static electricity can escape from the container bag that is suspended and transported in the air, a large amount of static electricity will accumulate. In addition, when the container bag is charged, there is a problem that dust and dirt from the outside world are adsorbed on the outer surface of the container bag and the container bag becomes dirty.

Therefore, the container bag is made of conductive fiber or conductive rubber so as to have conductivity so that the electrostatic charge can easily escape, and a ground wire is detachably attached to the outer surface of the container bag as an escape route for the electrostatic charge. Is proposed. If you attach the ground wire to the conductive container bag suspended on the carrier, the end of the ground wire hangs down on the ground, so the electrostatic charge generated in the electrostatically charged powder particles goes from the container bag to the ground through the ground wire. It is possible to prevent the discharge from being accumulated and the electrostatic charge being accumulated in the container bag or the electrostatically-charged granular material.

In Japanese Patent Publication No. 2-6712, a suspension belt for suspending a conductive container bag is made of a conductive rope, and the conductive rope is suspended on a metal hook of a carrier. , A technology has been proposed in which the electrostatic charge of the container bag is released to the transport device side via a conductive rope.

[0006]

In the above method of hanging the ground wire from the container bag to the ground, it takes time and effort to attach the ground wire to the container bag each time the static elimination work is performed. If the carrying device is carried while the ground wire is hung from the container bag, there is a problem that the ground wire is caught by surrounding objects or hits a worker. The suspended container bag is easy to rotate, but if the container bag rotates, the ground wire will be entangled or twisted. The ground wire that is dragged over the ground is severely damaged and cannot be used for a long time. It is extremely dangerous if the ground wire comes into contact with the power line or another charged object. If you attach and remove the ground wire as needed, you may forget to attach the ground wire when you really need it.

In the method of suspending the container bag with the conductive rope described above, the cost of the conductive rope is high. Moreover, since the conductive fibers forming the conductive rope have insufficient strength and are easily cut, the conductive fibers are generally woven into a part of the rope made of a non-conductive material. However, in this method, even if there is sufficient rope strength, it is possible that the conductive fibers are broken inside, but just by observing the appearance, the conductive fibers are broken. Not easily discernible. Therefore, the container bag using such a conductive rope cannot be continuously used for a very long period of time, and it takes time and labor to replace all the container bags on a regular basis.

An object of the present invention is to ensure that charge removal from a chargeable conveyed product can be performed reliably and easily.

[0009]

A static eliminator according to the present invention is a device for removing the charge of a chargeable carrier which is hung and carried by a hanging tool of a carrier. A conductive mounting portion, a conductive string, and a conductive contact portion are provided. The conductive mounting portion is mounted on the conductive portion of the hanging device. One end of the conductive cord-like body is connected to the conductive mounting portion, and the other end hangs down to the side of the electrostatically-charged conveyed product. The conductive contact portion is arranged on the other end side of the conductive string-like body and contacts the outer surface of the electrostatically-charged conveyed product.

The charged object is in a state where the charged object is housed in a container for carrying, or the charged object may be carried as it is without using the container. The container itself may be a chargeable object. The chargeable object is an object made of a synthetic resin, an inorganic material, a natural product, or the like, and made of a material that is easily charged or a material that causes a problem when charged. It may be a powder or granule, or a molded product or processed part having various shapes. Specific examples of powder and granules in which charging is a problem include PVC (polyvinyl chloride), PE (polyethylene), PP (polypropylene), nylon, PS
Plastics such as t (polystyrene), ABS, hydrocarbons such as paraffin, melamine, benzoguanamine,
There are organic compounds such as caprolactam, and food materials such as wheat flour, corn starch and sugar.

The container for accommodating the chargeable object is made of synthetic resin, synthetic or natural rubber, metal, fiber or other material in accordance with the shape and characteristics of the object to be accommodated. The container may be a rigid container, an assembled container for assembling a plurality of members, or a bag-shaped container made of a flexible sheet. A part of the container may be made of a rigid material and the remaining part may be made of a flexible material. As a bag-shaped container, there is a container called a container bag or a flexible container which has been conventionally used for transporting powder and granules. It is preferable that the outer surface of the container has conductivity in the whole or in a range where the conductive contact portion may come into contact.

As the transfer device, various types of cargo handling machines used in various product manufacturing sites and distribution sites are used, and a transfer device such as a crane or a hoist that suspends and transfers an object is applied. . The structure of the hanger differs depending on the structure of the electrostatically-charged object to be conveyed and the purpose of use. For example, a hook that hooks a rope or a hanging string is used. The transport device transports a transported object by vertically moving a hanging tool or traveling forward, backward, leftward, and rightward. In some cases, the hanger may move along a track such as a rail.

The hanger must be provided with a conductive portion at least in part. Normally, the entire transport device and suspension are made of a conductive material such as metal,
The entire suspender has conductivity. The transport device may have its structural portion grounded for safety and the like. The conductive portion of the hanger is preferably electrically connected to the grounding means of the carrier.

The conductive mounting portion of the static eliminator is adapted to be electrically connected to the conductive portion of the hanging device while being attached to the hanging device. Specifically, it may be attached to the conductive portion of the hanging device by mechanical means such as fitting or engaging. The conductive mounting portion may be fixedly attached to the suspension or may be detachably attached. A shackle metal fitting can be used as the detachable conductive mounting portion.

The conductive cord-like body is flexible enough to extend below the suspending tool and hang down along the outer surface of the electrostatically-charged conveyed product when attached to the suspending tool via the conductive mounting portion. Therefore, it is only necessary to have a structure capable of electrically connecting the conductive mounting portions mounted on both ends and the conductive contact portions.
For example, a material having conductivity such as a chain, a flexible metal wire material, or a metal wire braided material can be used. It is also possible to divide and structure the structural portion that achieves mechanical strength and the conductive portion, that is, the structural portion that achieves electrical connection, by using materials suitable for each. Specifically, it is possible to combine a chain having excellent mechanical strength and durability with a conductive wire made of copper or stainless steel having excellent conductivity.

The same member can be used for both the conductive cord and the conductive mounting portion. Specifically, if the conductive cord-shaped body made of a chain is directly attached to the hanging tool, the chain serves as both the conductive cord-shaped body and the conductive mounting portion. The length of the conductive cord is set according to the size of the chargeable carrier so that the conductive contact part attached to the other end of the conductive cord can surely contact the outer surface of the chargeable carrier. It is preferable to keep it. The conductive string-shaped body may be configured to be bendable or rollable so that the length of the conductive string-shaped body can be changed if the size of the chargeable conveyed product changes.

The conductive contact portion may be in contact with the outer surface of the electrostatically-charged object and can discharge the static electricity accumulated in the electrically-charged object. Therefore, it suffices that the outer surface of the electrically conductive contact portion contacting the outer surface of the electrostatically-charged conveyed product has electrical conductivity and that the electrically conductive portion of the electrically conductive contact portion is connected to the electrically conductive portion of the electrically conductive cord-shaped body. The material of the conductive contact portion may be a conductive metal material such as copper or iron, or a conductive material disposed on the surface of a non-metallic material or only on a part of the surface. Specifically, a foil such as copper may be pasted on the surface of a base material such as a synthetic resin.

As the conductive contact portion, it is possible to use a weight having a weight such that the conductive string-like body hangs down surely. Such a weight is preferable because the weight can be surely brought into contact with the outer surface of the chargeable conveyed product, and even if the chargeable conveyed product is shaken, poor contact between the conductive contact portion and the chargeable conveyed product does not easily occur. . The conductive contact portion may not be so heavy as long as the conductive string-like body is relatively heavy. Further, the lower part of the conductive string-like body itself may serve as a conductive contact portion so as to come into contact with the outer surface of the chargeable conveyed product.

The static elimination method of the present invention comprises the steps of preparing a carrier device in which the above-mentioned static eliminator is attached to a suspending tool, suspending a chargeable object by the suspending tool, and charging the conductive contact portion of the static eliminator. Contacting the outer surface of the sexually conveyed product. When a static charge remover is attached to the suspending tool of the transfer device and the chargeable transfer object is suspended by the suspending tool, the conductive contact part hanging from the suspending tool is pushed away by the chargeable transfer object. The conductive contact portion comes into contact with the outer surface of the chargeable conveyed product. The electrification that has occurred on the electrified conveyed product flows from the electroconductive contact part that contacts the external surface of the electrified conveyed object to the conductive attachment part through the conductive cord-shaped body, then escapes from the conductive attachment part to the hanging tool, The static charge of the sexually transported object is fulfilled. Even if the charged object being conveyed sways, tilts or swivels back and forth, the conductive contact part receives a force in the direction of contacting the outer surface of the charged object due to the weight. Even if the part is not fixed to the electrostatically-charged conveyed product, the conductivity from the electrically-charged conveyed product to the conductive contact portion is good, and the charge removal function can be surely achieved.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The static eliminator shown in FIGS. 1 and 2 is applied to a hoist transfer device H used to transfer a flexible container bag 40 containing a chargeable granular material. The container bag 40 is also called a flexible container or the like,
Although it is not shown in the figure, it is made of cloth material woven with conductive rubber or conductive fibers and has openable and closable openings at the top and bottom. It can be freely tightened. The container bag 40 contains a chargeable granular material such as plastic powder. A hanging string attachment portion 42 is provided near the upper end of the container bag 40. A hanging rope 44 is hung on the hanging string attachment portion 42, and the upper end of the hanging rope 44 is hung and lifted by the hook 30 of the carrying device H. The structure of such a container bag 40 is common to a container bag for accommodating an ordinary electrostatically charged powder or granular material.

The carrying device H has a hook mounting portion 20 which is moved up and down by a motor or manual hoisting. Although not shown, a drum for winding up the lifting chain 22 and a traverse mechanism for traversing the drum are provided above the hook mounting portion 20. The hook mounting portion 20 and the lifting chain 22 are made of a conductive material, and the beams and columns that form the structural portion of the carrier device H are grounded, or the factory building to which the carrier device H is mounted is grounded. Part 20
Is also grounded. The basic structure of these hoist transfer devices H is common to the conventional ordinary hoist transfer devices.

A first hook 24 is provided at the lower end of the hook mounting portion 20 as a suspending tool attached to the hoist transfer device.
The second hook for attaching the static eliminator to the first hook 24
The hook 30 is detachably attached. 2nd hook 3
If 0 is removed, the carrier device H can be used for various purposes as a normal hoist carrier device. The second hook 30 is made of a steel material and has conductivity. At the upper end of the second hook 30,
It has a ring portion 32 hooked on the first hook 24. Below the ring portion 32, there is a relatively large and thick inverted “?”-Shaped hook portion 34. A holding piece 35 that elastically swings is provided near the opening on the side of the hook portion 34. The pressing piece 35 prevents the rope or the like inserted in the hook portion 34 from coming off. When the rope or the like is pushed into the hook portion 34 from the outside of the pressing piece 35, the pressing piece 35 is elastically deformed, so that the rope or the like can be inserted. A U-shaped attachment fitting 36 for attaching the static eliminator is fixed to the outer surface of the second hook 30.

The static eliminator 10 comprises a chain 14 made of stainless steel.
And shackle 12 attached to the top of chain 14 and chain 1
4 and the weight 18 attached to the lower end of 4. As shown in detail in FIG. 2, a relatively thin and flexible stainless steel wire 15 is attached along the chain 14. Specifically, a SUS wire having a diameter of about 0.5 mm is used. Steel wire 1
5 is wound around each chain ring of the chain 14, so that the steel wire 15 is integrated with the chain 14. The upper end of the steel wire 15 is connected to the shackle 12, and the lower end of the steel wire 15 is connected to the weight 18.

The structure of the shackle 12 is similar to that of a shackle metal fitting used for connecting chains and the like in ordinary cargo handling machines and the like. The shackle 12 has the second hook 30.
Is removably engaged with the mounting bracket 36. Therefore,
When the static eliminator 10 is not used, the shackle 12 is removed from the mounting bracket 36, and the static eliminator 10 is attached to the second hook 3
You can also remove it from scratch.

The weight 18 has a substantially cylindrical shape, and has a lower end 18a.
Is tapered and thin. At the upper end of the weight 18, there is a mounting ring 18b that is swingably mounted, and this mounting ring 18b is connected to the chain 14. As shown in FIG.
The static eliminator 10 suspended from the second hook 30 has the weight 1
The chain 14 hangs downward due to the weight of the entire static eliminator 10 including 8. When the container bag 40 is hung on the second hook 30 with the hanging ropes 44, 44, the chain 14 is pushed to the side by the container bag 40, and the chain 14 is attached to the outer surface of the container bag 40. Will hang along. FIG.
As shown in, the weight 18 comes into contact with the outer surface of the container bag 40.

When the container bag 40 or the chargeable granular material contained therein is charged, static electricity flows to the weight 18 of the static eliminator 10 which is in contact with the outer surface of the container bag 40, which is a conductive bag, and the weight is reduced. Static electricity moves from 18 to the shackle 12 via the chain 14 or the steel wire 15 and is discharged to the main body side of the carrier device H from the shackle 12 to the second hook 30. As a result, static electricity can be prevented from accumulating in the container bag 40.

Even if the container bag 40 sways, tilts, or rotates during the transfer operation, the weight 18 always tries to hang downward due to the action of gravity, so that the weight 18 is surely attached to the outer surface of the container bag 40. Will come into contact. Also, chain 14
When a large movement occurs, the contact between the chain rings forming the chain 14 may be temporarily interrupted, but since the copper wire 15 surely fulfills the electrical connection from the weight 18 to the shackle 12, the static elimination action is always performed. It is well served.

When the transportation of the container bag 40 is completed, the hanging rope 44 is removed from the second hook 30 and the container bag 40 is removed.
When the container is removed, the contact between the container bag 40 and the weight 18 is released. Next, if another container bag 40 is suspended, the weight 1
8 again comes into contact with the outer surface of the container bag 40 to perform the static elimination action. Even when the container bags 40 having different shapes and sizes are sequentially hung, the weights 18 attached to the chains 14 reliably contact the outer surface of the container bag 40 to perform the static elimination action.

In the above-described embodiment, as the suspending tool, in addition to the first hook 24 originally provided in the carrying device H, the second hook 30 provided with the mounting bracket 36 of the static eliminator 10 is used. With such a structure, when the mounting bracket 36 is provided directly on the first hook 24, it is effective in preventing the strength of the first hook 24 from being lowered due to welding work when mounting the mounting bracket 36. is there. When the transfer device H is used without the static eliminator 10, the second
If the hook 30 is removed, the mounting bracket 36 can be prevented from interfering with the work.

Other Embodiments (a) The static eliminator 10 may be attached to the first hook 24 instead of the second hook 30. In this case, the first hook 24 may be provided with an attachment means similar to the attachment fitting 36. Further, the static eliminator 10 may be attached to the hook attaching portion 20 of the carrying device H or the like.

(B) Normally, the static eliminator 10 is a carrier device H.
It suffices to attach one static eliminator 10 to one hanging tool of the above, but if a plurality of static eliminators 10 are attached, the contact with the conductive contact portion such as the weight 18 with respect to the chargeable carrier 40 is more reliable. become. It is also possible to attach a plurality of static eliminators 10 having different lengths of the conductive cords, that is, different height positions of the conductive contact portions 18 to the suspending tool of the carrier H.

[0032]

According to the static eliminator and the static eliminator according to the present invention, the static eliminator including the conductive mounting portion, the conductive cord and the conductive contact portion is simply attached to the suspending tool of the carrying device to suspend the static eliminator. When the chargeable conveyed product is hung on the lower tool, the conductive contact portion automatically comes into contact with the outer surface of the chargeable conveyed product to easily and reliably remove the charge from the chargeable conveyed product.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention and showing a charge eliminating device and a charge eliminating method using the same.

FIG. 2 is an enlarged side view showing a conductive contact portion of the static eliminator.

[Explanation of symbols]

 10 Static eliminator 12 Shackle (conducting mounting part) 14 Chain (conducting string) 18 Weight (conducting contact part) 20 Hook mounting part 30 Second hook 40 Container bag (charged transfer object) 44 Suspended rope H transfer device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyoshi Kawamura 1 992 Nishikioki, Kamahama, Aboshi-ku, Himeji-shi, Hyogo Nihon Shokubai Co., Ltd.

Claims (6)

[Claims] 1. A device for removing the charge of a chargeable transport object that is hung and transported by a suspending tool of a transporting device, wherein a conductive mounting portion that is mounted on a conductive portion of the suspending tool and one end of which is provided. A conductive string-like member which is connected to the conductive attachment part and has the other end hanging down to the side of the chargeable carrier, and a conductive contact which is arranged at the other end of the conductive string-like member and contacts the outer surface of the chargeable carrier. And static elimination device. 2. The static eliminator according to claim 1, wherein the conductive contact portion is a weight having conductivity on at least an outer surface thereof. 3. The conductive cord-like body mechanically connects the conductive mounting portion and the conductive contact portion with each other, and electrically connects the conductive mounting portion and the conductive contact portion with each other along the chain. The static eliminator according to claim 1 or 2, further comprising a conductive wire that is electrically connected. 4. The static eliminator according to any one of claims 1 to 3, wherein the chargeable conveyed product is a container bag containing a chargeable granular material. 5. The suspending device is grounded.
The static eliminator according to any one of 1. 6. A step of preparing the carrying device in which the static eliminator according to any one of claims 1 to 5 is attached to the suspending tool, and the suspending tool suspends the electrostatically-conveyed object. A step of bringing the conductive contact portion of the static eliminator into contact with the outer surface of the electrostatically-charged conveyed product.