JP7435365B2 - Bucket conveyor and its manufacturing method - Google Patents

Description

The present invention relates to a bucket conveyor and a method for manufacturing the same. More specifically, the present invention relates to a bucket conveyor suitable for conveying hard objects such as metal or metal compound particles, and a method for manufacturing the same.

A bucket conveyor generally has a structure in which a plurality of steel buckets are connected to a chain, and power is transmitted to the chain via sprockets to convey the buckets. This kind of bucket conveyor puts the object into the bucket at any position on the transport route, transports it to another position on the transport route, and then discharges the object from the bucket by tilting the bucket. Used as a transport device.

One example of the use of bucket conveyors is the transportation of matte raw materials, which are metal sulfides. In this usage example, when raw materials are loaded into and discharged from the bucket, the thickness of the bucket is reduced due to collision and friction between the mat raw material and the inner surface of the bucket. As a means to prevent the thickness of the bucket from thinning, it is possible to apply appropriate lining, coating, or painting to the surface of the plate material constituting the bucket.

Related to the above-mentioned means, prior art techniques disclosed in Patent Documents 1 to 3 have been proposed.
Patent Document 1 discloses that in order to prevent transported objects from adhering to the bucket, the entire outer surface of the bucket body is lined with wear-resistant soft rubber, the entire inner surface of the bucket body is lined with base rubber for adhesive, and the inner bottom surface of the bucket is lined with a base rubber for adhesive. discloses an unloader bucket in which a foam rubber layer is formed and a high tensile strength soft rubber layer in which reinforcing fibers are embedded.
Patent Document 2 discloses a hopper in which the inner surface of the steel box of the hopper is coated with a resin coating having wear resistance and vibration absorption properties, with the aim of further reducing noise and vibration during use. ing.
Patent Document 3 discloses that for the purpose of preventing objects from adhering to objects, a thermal spraying material made of wear-resistant metal materials such as aluminum and zinc is thermally sprayed onto a steel base material, and then fluorine is added to the surface of the thermal spraying material. An unloader bucket is disclosed that is coated with a surface material that is a non-adhesive material such as a resin.

Japanese Patent Application Publication No. 2009-137679 Japanese Patent Application Publication No. 2014-125238 JP2017-87166A

In the bucket conveyor of the above-mentioned prior art, when the lining and coating wear progresses, it leads to thinning of the bucket, and eventually the bucket becomes perforated or deformed. Puncture or deformation of the bucket causes leakage of conveyed objects or accumulation of conveyed objects in the casing of the bucket conveyor, requiring the equipment to be stopped for recovery measures. In particular, if the area around the bolt hole that secures the bucket body and chain becomes thinner and the bolt hole becomes wider than the bolt seating surface, the bucket may come off the chain and become cantilevered, or the bucket may fall off the chain. There are things to do. In this case, the bucket gets caught in the casing of the bucket conveyor and becomes locked, causing serious equipment damage and even failure of the electric motor.

Additionally, when a wear-resistant resin lining is applied to the entire surface of the bucket, the surface of the wear-resistant resin lining often does not become a perfectly flat or smooth surface, and the bucket surface and bolt/nut washer surfaces do not come into uniform contact. There is a problem in that the bolts loosen while the bucket conveyor is in operation, making it easy for the buckets to fall off. In this case as well, if the bucket falls off, it will cause serious damage to the equipment as described above.

The conventional techniques disclosed in Patent Documents 1 to 3 can be expected to have a certain degree of effect in preventing adhesion of conveyed objects and suppressing noise and vibration.
However, problems such as loosening of fixation of the bucket to the conveyor chain and thinning of bolt holes are not even mentioned, and these problems remain unsolved.

In view of the above circumstances, it is an object of the present invention to provide a bucket conveyor that has a structure that suppresses thinning of the bucket due to wear and prevents the bucket from falling off due to loosening of the bolt connecting member, and a method for manufacturing the same.

A bucket conveyor according to a first aspect of the present invention is a bucket conveyor in which a plurality of buckets made of steel plate material are attached to a mounting plate of a traction member with a bolt connecting member, and the inner surface of the bucket has an inner surface of the steel plate material. A wear-resistant lining layer formed using a wear-resistant resin; and a wear-resistant lining layer formed using a wear-resistant resin, and a wear-resistant resin not present in a portion of the inner surface of the steel plate material where the washer of the bolt coupling member is located, and the washer being located in the steel plate material. It is characterized by being provided with an exposed portion that comes into direct contact with the inner surface of the device.
A bucket conveyor according to a second invention is characterized in that, in the first invention, the bucket has a wear-resistant lining layer also formed on the outer surface of the steel plate material.
A bucket conveyor according to a third invention is characterized in that in the first or second invention, the wear-resistant resin is a polyurea resin.
In the bucket conveyor of a fourth aspect of the invention, in the second or third aspect of the invention, on the outer surface side of the steel plate material, a bonding surface that the mounting plate contacts is a non-resin blown surface where the mounting plate directly contacts the outer surface side of the steel plate material. It is characterized by being an attached surface.
A method for manufacturing a bucket conveyor according to a fifth aspect of the invention includes a first mounting step of mounting a bucket made of a steel plate material to a mounting plate of a traction member using a bolt connecting member, and spraying a wear-resistant resin on the inner surface of the bucket to make it wear-resistant. In the spraying process for forming the adhesive lining layer, before the sprayed wear-resistant resin has solidified and has lost its fluidity, the bolt connection member is removed to remove the exposed portion where the wear-resistant resin is not present. and a second attaching step of coupling the bucket to the mounting plate using the bolt coupling member after the wear-resistant resin has solidified.

According to the first aspect of the invention, the wear-resistant lining layer formed on the inner surface of the steel plate material constituting the bucket alleviates the wear caused by the objects to be transported, thereby preventing thinning of the inner surface of the bucket. Therefore, the life of the bucket can be extended. In addition, by placing the washer of the bolt connection member on the exposed inner surface of the steel plate that makes up the bucket, it can be brought into direct contact with the inner surface of the steel plate, increasing the fastening force when the bucket is bolted to the mounting plate. Increased installation strength. As a result, it is possible to prevent the bucket from falling off due to loosening of the bolt for a long period of time.
According to the second aspect of the invention, since the wear-resistant lining layer is present not only on the inner surface of the bucket but also on the outer surface thereof, it is possible to alleviate wear not only on the inner surface but also on the outer surface of the bucket.
According to the third aspect of the invention, the polyurea resin has a high elongation rate and high tensile strength, and has excellent impact resistance, and is flexible, so that noise can be reduced. In addition, since it can exhibit wear resistance over a long period of time, the life of the bucket is extended and the effect of preventing the bucket from falling off is extended.
According to the fourth invention, since the attachment plate of the traction member can be brought into direct contact with the outer surface of the steel plate material forming the bucket, the bucket can be reliably fixed to the traction member. As a result, it is possible to prevent the bucket from falling off due to loosening of the bolt for a long period of time.
According to the fifth invention, when the bucket is attached to the mounting plate using the bolt connection member in the first installation step and the wear-resistant resin is sprayed in the spraying step, the inner surface of the bucket including the surface of the bolt connection member is coated with wear-resistant resin. A lining layer of abrasive resin can be formed. If the removal process is performed and the bolted joint member is removed before the wear-resistant resin has solidified, the wear-resistant resin will be removed only from the part where the bolted joint member was present, and the exposed part where the steel plate material will be exposed will be removed. can. After that, when the bucket is again connected to the mounting plate using the bolt connection member, the washer of the bolt connection member is placed directly on the exposed part and can be directly connected to the steel plate material, so that high connection strength can be maintained over a long period of time. Therefore, the bucket of the first invention can be configured in a very simple manner. Furthermore, since the gap between the end of the lining layer and the washer can be minimized, it is possible to prevent the directly exposed portion from being abraded by objects to be transported.

1 is a sectional view of a bucket 1 in a bucket conveyor according to an embodiment of the present invention. FIG. 3 is a process diagram showing a method for manufacturing a bucket conveyor according to the present invention. FIG. 2 is an explanatory diagram of the attached state of the bucket 1, in which (A) is a side view and (B) is a plan view. FIG. 2 is an explanatory view of the attachment structure of the bucket 1, in which (A) is a perspective view with the side plate 1c attached, and (B) is a perspective view with the side plate 1c omitted. FIG. 2 is an explanatory diagram of the basic structure of a bucket conveyor.

Next, embodiments of the present invention will be described based on the drawings.
The bucket conveyor according to the present invention can be applied to convey various objects in various industrial fields, and one example of application is a conveyor for matte raw materials in a nickel hydrometallurgical smelting plant. . The matte raw material referred to herein is nickel compound particles having a particle size of about 700 μm and consisting of Ni ₃ S ₂ as the main substance. This mat raw material is hard and has a high specific gravity, so when it collides with the metal plate that makes up the bucket, it tends to generate large vibrations and noise, and it tends to cause thinning of the metal plate due to wear.

An example of the basic configuration of the bucket conveyor BC will be explained based on FIG. 5. Reference numeral 10 denotes a casing of the bucket conveyor BC, which includes an intermediate casing 10M extending vertically, a lower casing 10L extending laterally from the lower end of the intermediate casing 10M, and an upper casing 10U extending laterally from the upper end of the intermediate casing 10M. A hopper 11 is provided on the upper surface of the lower casing 10L, into which the objects to be transported M are placed, and a discharge port 12 is provided on the lower surface of the upper casing 10U, through which the objects to be transported M are discharged.
A sprocket 13 is attached to the end of the lower casing 10L, and a sprocket 14 is attached to the end of the upper casing 10U. Guide sprockets 16 are attached to appropriate positions on the casings 10M, 10L, and 10U.

One of the upper and lower sprockets 13 and 14 is a driving sprocket connected to a motor, and the other is a driven sprocket. A chain 15 serving as a traction member is wound between the upper and lower sprockets 13 and 14 via a guide sprocket 16, and a large number of buckets 1 are connected to this chain 15. The illustrated bucket conveyor BC is a so-called O-shaped type having casings 10L and 10U extending horizontally and laterally from the lower and upper portions of a vertically oriented intermediate casing 10M. The bucket conveyor to which the present invention is applied is typically an Otsu-shaped type, but the present invention is not limited to this and can be applied to various forms.

In bucket conveyors for transporting mat raw materials, the bucket 1 is often made of a highly durable steel plate material such as SS400. A large number of buckets 1 are used and are fixed to a chain 15 that moves along a conveyance path.

In the bucket conveyor BC having the above configuration, when the chain 15 moves due to the rotation of the sprockets 13 and 14 at both ends, the many buckets 1 attached to the chain 15 also move. When a powder-like material to be transported is put into the bucket 1 through the input port 11, the bucket 1 moves upward, and when it reaches the upper position, the bucket 1 rotates, and the material can be discharged from the discharge port 12.

The enlarged view in FIG. 5 shows the attachment portion of the bucket 1 to the chain 15. The chain 15 is made up of a large number of chain units 15U connected together, and the bucket 1 is fixed to the chain unit 15U via a mounting plate 2.
The bucket 1 is a triangular container in a side view, and is a well-known container having a V-shaped cross section, two sides made of steel plate material, and one side having an opening.

The attachment structure of the bucket 1 to the chain 15 will be explained based on FIG. 4. The figure (A) shows the bucket 1 with the side plate 1c attached, and the figure (B) shows the bucket 1 with the side plate 1c removed. The bucket 1 has a V-shaped cross section and includes a front plate 1a, a rear plate 1b, and a side plate 1c made of steel plates. The front plate 1a and the rear plate 1b may be made by bending one steel plate, or may be made by welding two steel plates. The side plate 1c is a triangular steel plate material and is welded to both end edges of the front plate 1a and the rear plate 1b.

The chain 15 is made up of a large number of chain units 15U connected together, and each chain unit 15U is provided with two rollers 15b, 15b pivotally supported at both ends of two links 15a, 15a.
The mounting plate 2 is a member having an L-shaped cross section, and the lower plate 2a shown vertically in the figure is fixed to the inner (bucket side) link 15a of the two links. The upper plate 2b shown horizontally in the figure is bolted to the rear plate 1b of the bucket 1.
The small holes formed in the rear plate 1b and the small holes formed in the upper plate 2b are both bolt insertion holes 3 and 4.

Based on FIG. 1, details of the bucket 1 applied to the bucket conveyor of the present invention will be explained.
A wear-resistant lining layer 5 is formed on the inner surfaces of the front plate 1a, rear plate 1b, and side plate 1c (not shown) of the bucket 1 shown in FIG. 1.
This wear-resistant lining layer 5 is formed by spraying a wear-resistant resin. As the abrasion-resistant resin, any resin can be used without particular limitation as long as it can reduce the impact when the transported objects thrown into the bucket 1 are received. This is because if the impact can be alleviated, thinning can also be suppressed.

As the wear-resistant resin, polyurea resin is preferred. Polyurea resin is a resin in which polyisocyanate and polyamine react to form urea bonds.
Polyurea resin provides excellent impact resistance due to its high elongation rate and high tensile strength, and its flexibility also reduces noise.
The polyurea resin lining can be formed by a spraying method, whereby the wear-resistant lining layer 5 can be formed not only on flat areas but also on recessed areas and protruding areas.
The wear-resistant lining layer 5 can have a large thickness, for example 1 to 2 mm. This allows impact resistance to be exhibited over a long period of time.

When polyurea resin is sprayed to form the wear-resistant lining layer 5, the resin with a thickness of about 1 to 2 mm adheres to the inner surface of the bucket 1, but the surface is not smooth and has a gentle slope even after curing. This will leave some unevenness.
For this reason, even if a washer is placed on the top surface of the wear-resistant lining layer 5 and the rear plate 1b and the mounting plate 2 are bolted together, the contact area of the washer may be small or uneven contact may occur, resulting in insufficient fastening strength. is not obtained.

However, as shown in FIG. 1, the bucket 1 to which the present invention is applied has an exposed portion 6 where the polyurea resin is not present at a portion where the washer should be placed. This exposed portion 6 is a circular recess large enough to fit a washer 7. It is preferable that the outer diameter of the exposed portion 6 is equal to the outer diameter of the washer 7, and that there is no gap or a very small gap.
By using this exposed portion 6 to bring the washer 7 into direct contact with the inner surface of the rear plate 1b, and then tightening the bolt and nut by placing the head of the bolt or placing the nut, the bolt and nut will not come loose. .

There is no limit to the method of forming the exposed portion 6 provided in the bucket 1, and any method may be used. Therefore, the wear-resistant resin may be sprayed after masking. However, in order to be simple and to make the inner diameter of the exposed portion 6 exactly equal to the outer diameter of the washer 7 so that no gap is generated, the manufacturing method of the present invention described below is preferable.

The manufacturing method of the present invention will be explained below based on FIG. 2.
I: First installation step: Attach the bucket 1 to the mounting plate 2 with a bolt connection member.
The bolt connection member is a known connection member that combines a bolt 8 and a nut 9 with a washer 7 (also shown in FIG. 1). The washer 7 includes a flat washer made of a flat thin metal, and a spring washer made by cutting a part of the metal iron to give it elasticity. In the present invention, it is possible to use only a flat washer, only a spring washer, or a combination of a flat washer and a spring washer.
In the illustration, the head of the bolt 8 is placed on the side of the mounting plate 2, and the nut 9 is placed on the side of the bucket 1, but by reversing this arrangement, the head of the bolt 8 is placed on the side of the bucket 1, and the nut 9 is placed on the side of the mounting plate 2. It's okay.

II: Spraying process Wear-resistant resin (typically polyurea resin) is sprayed onto the inner surface of bucket 1. This forms the wear-resistant lining layer 5. At this time, the wear-resistant lining layer 5 is sprayed to cover not only the inner surfaces of the front plate 1a, the rear plate 1b, and the side plates 1c, but also the tips of the nuts 9 and bolts 8.

III: Removal process The bolt 8, nut 9, and washer 7 are removed before the sprayed wear-resistant resin (typically polyurea resin) has solidified and has lost its fluidity. When these bolt connection members are removed, an exposed portion 6 in which no wear-resistant resin is present is formed. The exposed portion 6 formed here has an outer diameter that matches the outer diameter of the washer 7. Note that polyurea resin has a short curing time, so continuous work can be performed without the need for time management, which is also advantageous.

IV: Second attachment process After the removal process, the wear-resistant lining layer 5 is completely solidified if left for a predetermined period of time. The standing time varies depending on the type of resin, the blending ratio of the curing agent, etc. Typical polyurea resins will harden within a few minutes, but it is desirable to allow one to several hours for complete hardening. After the wear-resistant lining layer 5 has completely hardened, the bucket 1 is again connected to the mounting plate 2 using bolts 8, nuts 9 and washers 7. In this case, the washer 7 is placed on the exposed part 6.
Note that the outer surface of the recombined nut 9 may be reapplied with a wear-resistant resin. This eliminates the inconvenience that only the nut 9 inside the bucket 1 wears out prematurely without being coated.

According to the above manufacturing method, as shown in FIG. 1, the gap between the end of the lining layer and the washer 7 can be eliminated or minimized. Furthermore, the exposed portion 6 can be easily formed.
Then, when the bucket 1 is coupled to the mounting plate 2 with bolts 8 and nuts 9 with the washer 7 placed on the exposed portion 6 as shown in FIG. 1, the mounted state of the bucket 1 shown in FIG. 3 is obtained.
In the installed state shown in FIGS. 1 and 3, the washer 7 on the nut 9 side directly contacts the inner surface of the rear plate 1b, so the tightening force of the nut 9 can be directly transmitted to the flat inner surface of the rear plate 1b. , loosening of bolts 8 and nuts 9 can be suppressed. Further, it is also possible to prevent the exposed portion 6 from being worn out due to collisions with objects to be transported.

(Other embodiments)
In the above embodiment, the wear-resistant lining layer 5 is formed on the inner surface of the bucket 1, but the wear-resistant lining layer 5 may be formed on the outer surface of the bucket 1. In this case, even if the mat raw material collides with the outer surface of the bucket 1, noise, vibration, and thinning caused by the collision can be suppressed.

In addition, in the embodiment in which the wear-resistant lining layer 5 is formed on the outer surface of the bucket 1, on the outer surface side of the steel plate material constituting the bucket 1, the joint surface that the mounting plate 2 contacts as shown in FIG. 4 is covered with the wear-resistant lining layer. This is a non-resin-sprayed surface on which no resin is sprayed to prevent the formation of resin. To make the surface non-resin sprayed, a method such as masking may be used during resin spraying. By forming a non-resin sprayed surface, the mounting plate 2 can be brought into direct contact with the outer surface of the steel plate material.
Therefore, the attachment plate 2 and the steel plate material can be fastened together with the bolts 8 and nuts 9 in a state where they are directly aligned, so that the bucket 1 can be reliably fixed to the chain 15. As a result, it is possible to prevent the bucket 1 from falling off due to loosening of the bolts 8 and nuts 9 for a long period of time.

Hereinafter, the present invention will be explained in more detail with reference to Examples.
(Example 1)
A bucket conveyor (conveyance capacity: 60 t/hr) for conveying mat raw materials, which was equipped with 168 buckets (width 200 x height 280 x length 600) made of steel plate material SS400, was used for the experiment. A wear-resistant lining layer 5 made of polyurea resin was formed on two of the 168 buckets 1. These two buckets are products to which the first invention is applied.

The polyurea resin was applied to the inner surface of the bucket by spraying, and the film thickness was 1 to 2 mm. The details of construction are as in the manufacturing method of the fifth invention.

The shape of the bucket 1 is the structure shown in FIG. That is, the bucket 1 is fixed to the mounting plate 2 using bolts 8, nuts 9, and washers 7. There is no wear-resistant resin between the mounting plate 2 and the outer surface of the rear plate 1b, and between the washer 7 and the inner surface of the rear plate 1b, so they are in direct contact.

Comparative examples are 166 buckets in which the wear-resistant lining layer 5 of the present invention was not formed on the inner surface of the bucket 1. In contrast to the bucket of the comparative example, where the wear of the base material on the inner surface of the bucket progressed after 5 months of operation, there was no progress of wear on the steel plates constituting the two buckets on which the wear-resistant lining layer 5 was formed according to the present invention. Meat could be prevented. Therefore, the bucket 1 did not fall off due to thinning around the bolt hole and the bolt hole became wider than the bolt seating surface, and the bolt connection member did not loosen, and the bucket 1 did not fall off.

The bucket conveyor of the present invention is suitable for conveying hard and heavy objects such as metal or metal compound particles.

1 Bucket 2 Mounting plate 3 Bolt insertion hole 5 Wear-resistant lining layer 6 Exposed part 7 Washer 8 Bolt 9 Nut 15 Chain BC Bucket conveyor

Claims (5)

A bucket conveyor in which a plurality of buckets made of steel plate materials are attached to a mounting plate of a traction member with a bolt connection member,
The inner surface of the bucket includes a wear-resistant lining layer formed using a wear-resistant resin on the inner surface side of the steel plate material, and a wear-resistant lining layer formed on the inner surface side of the steel plate material at a portion where the washer of the bolt coupling member is located. A bucket conveyor characterized in that an exposed portion is provided in which no wear-resistant resin is present and the washer comes into direct contact with the inner surface of the steel plate material. 2. The bucket conveyor according to claim 1, wherein the bucket has a wear-resistant lining layer also formed on the outer surface of the steel plate material. 3. The bucket conveyor according to claim 1, wherein the wear-resistant resin is a polyurea resin. Claim 2 or 3, characterized in that, on the outer surface side of the steel plate material, the joint surface that the mounting plate abuts is a non-resin sprayed surface on which the mounting plate directly contacts the outer surface side of the steel plate material. Bucket conveyor as described. a first attachment step of attaching the bucket made of steel plate material to the attachment plate of the traction member with a bolt connection member;
a spraying step of spraying a wear-resistant resin onto the inner surface of the bucket to form a wear-resistant lining layer;
a removal step of removing the bolt connection member before the sprayed wear-resistant resin solidifies and loses its fluidity to form an exposed portion where the wear-resistant resin does not exist;
A method for manufacturing a bucket conveyor, comprising sequentially performing a second mounting step of coupling the bucket to the mounting plate using the bolt coupling member after the wear-resistant resin has solidified.