JP6601877B2 - Intermediate bearing unit for horizontal screw conveyor - Google Patents

Description

  The present invention relates to an intermediate bearing unit for a horizontal screw conveyor, and more particularly to an intermediate bearing unit for a horizontal screw conveyor that rotatably supports a middle portion of a rotating shaft of a horizontal screw conveyor that is horizontally disposed.

For example, a horizontal screw conveyor described in Patent Document 1 is known as a conveyor for conveying powder particles such as cement and grains in the horizontal direction. This is because the spiral blades are provided on the outer peripheral surface of a horizontally long cylindrical body that is a conveyance path for the powder and the horizontally long rotating shaft that is housed in the cylindrical body and is rotatably supported by a pair of bearings. And a motor for rotating the rotating shaft.
During operation, the screw is rotated by rotating the rotating shaft by the motor, and the granular material charged from the upstream inlet of the cylinder is conveyed to the downstream outlet.

JP 2011-144038 A

By the way, in the horizontal screw conveyor of patent document 1, when the conveyance distance of the granular material became long and the conveyor lengthened, the dead weight of the screw increased and the blurring had arisen on the rotating shaft. Thereby, for example, the spiral blade is in contact with the inner peripheral surface of the cylindrical body, and wear and metal noise are generated. In addition, the cylinder, and thus the entire screw conveyor, vibrated, causing loose bolts and metal fatigue in various places.
Conventional intermediate bearings are generally plain bearings having a halved structure that is easy to maintain. Sliding bearings are made of a hard metal cemented around the outer circumference of the inner ring and the outer circumference of the outer ring, and are used while regularly replenishing grease between the inner and outer rings by a metering pump. , Configured to reduce frictional resistance and frictional heat.

  Therefore, as a result of earnest research, the inventor provided an intermediate bearing in the middle of the length direction of the rotating shaft, and horizontally mounted the beam material on the upper part of the left side plate and the upper side of the right side plate of the cylindrical body. The present invention has been completed by discovering that all the above-mentioned problems can be solved if the intermediate bearing is detachably suspended by a bearing suspension.

An object of the present invention is to provide an intermediate bearing unit for a horizontal screw conveyor that can prevent the rotation of the rotating shaft associated with the lengthening of the screw.
In addition, the present invention can reduce the cost of the bearing, does not require a grease supply unit in the horizontal screw conveyor, and can reduce the number of times of grease injection and the amount of grease injected per time within a certain period. As a result, it is possible to reduce the maintenance cost and to provide an intermediate bearing unit for a horizontal screw conveyor in which grease is difficult to be mixed into the granular material being conveyed in the cylinder.

The invention according to claim 1 is the length of the rotating shaft among the screws housed in the cylinder for conveying the granular material and having spiral blades provided around the outer peripheral surface of the rotating shaft extending in the horizontal direction. An intermediate bearing unit for a horizontal screw conveyor that supports a middle part of a direction so as to be rotatable with respect to the cylindrical body, the cylindrical body including a cylindrical main body in which a bottom plate, a left side plate, and a right side plate are connected in a bowl shape; A lid plate that closes the upper surface opening of the cylinder body, an intermediate bearing is provided in the middle of the rotating shaft, and a beam material is placed between the upper part of the left side plate and the upper side of the right side plate. The intermediate bearing is detachably suspended from the beam member via a bearing suspension, and the bearing suspension covers the intermediate bearing from the circumferential direction, and has left and right ends. A cylindrical bearing holder with a pair of supporting protrusions extending from the side, and both sides of the beam in the length direction A pair of left and right L-shaped suspensions having upper ends connected to each other and formed at each lower end with hooking claws hooked to a pair of holder hooking recesses arranged on the tip end surfaces of the respective support protrusions. The bearing holder covers the upper portion of the intermediate bearing, and a pair of rectangular upper cylindrical upper part holders extending from the left and right end sides, and the upper part holder A halved cylindrical lower part holder that covers the lower part of the intermediate bearing in a state where it is detachably connected to the partial holder, and a pair of lower part protruding pieces of a square bar shape extend from the left and right end sides; The holder latching recess has a step on the upper side recess formed in a step shape on the lower side of the tip surface of the upper part projection piece, and on the upper side of the tip surface of the lower part projection piece. an intermediate bearing unit for horizontal screw conveyor in which the and Jo which is formed in the lower part recess is vertically bisected That.

  According to invention of Claim 1, an intermediate bearing is provided in the middle part of the length direction of a rotating shaft, a beam material is horizontally mounted on the upper part of the left side board of a cylinder, and the upper part of a right side board, The intermediate bearing was removably suspended by a bearing suspension. Thereby, even when a horizontal screw conveyor becomes long and a screw becomes long, the bending by the dead weight of a screw is suppressed and the blurring of a long rotating shaft can be prevented. As a result, the vibration, wear and metal sound of the cylinder that occurs when the spiral blade contacts the inner peripheral surface of the cylinder are not generated, and the loosening of bolts placed at various locations on the conveyor and metal fatigue are suppressed. Can do.

Further, the bearing suspension is not attached to the cover plate, but is attached to a beam member laid across the upper part of the left side plate and the upper side of the right side plate of the cylinder body. Therefore, the support load of the intermediate bearing is distributed to the left side plate and the right side plate via the beam material, and deformation of the cylindrical body due to load concentration can be suppressed. If the bearing suspension is suspended from the lid plate, the support load of the intermediate bearing is concentrated on the lid plate, so that the lid plate is deformed and the rotation shaft is likely to be shaken.
Furthermore, in the type in which the bearing suspension is attached to the lid plate in this way, the upper surface opening of the cylinder body cannot be closed with the rotating shaft centered. In other words, after closing the cylinder body in advance, it is necessary to operate the part that protrudes outside the cover plate to move the bearing suspension vertically and adjust the suspension height of the intermediate bearing. is there. Since this operation must be performed in a closed state where it cannot be visually observed as described above, it is difficult to center the rotating shaft. However, in the present invention, since the bearing suspension is attached to the beam material, it is possible to easily center the rotating shaft with the bearing suspension with the cover plate opened.

  Further, as a method of supporting the rotating shaft different from that for attaching the bearing suspension to the cover plate, a horizontal arm (bearing holder) passing through the axis of the screw as in, for example, Japanese Patent No. 5162048 acquired by the present applicant. It is conceivable to lay the frame on the left side plate and the right side plate. However, in this method, compared to the case of a beam member laid horizontally on the upper part of the cylinder main body, the pressure of the granular material acting on the horizontal arm during the conveyor operation increases. In other words, the horizontal arm disposed below the beam attachment position has a high contact frequency with the powder flowing through the cylinder body, and the weight of the powder received from above also increases. As a result, the damage caused by the use of the horizontal arm is more severe than the beam material.

The use of the horizontal screw conveyor is not limited. For example, it is possible to employ a horizontal screw conveyor mounted on a particle carrier ship (such as a cement tanker) that transports particles such as cement or fly ash to the sea. Moreover, the horizontal screw conveyor which horizontally transfers a granular material to the silo and hopper installed in various factories and plants may be used.
As a granular material, various grains etc. can be employ | adopted besides cement and fly ash, for example.
The shape of the cylinder body is arbitrary as long as it is bowl-shaped. For example, the bottom plate may be a flat plate or a semicircular cross section. Further, the lid plate may be a flat plate or a curved plate having an arc cross section.
The rotational speed of the rotating shaft is arbitrary. For example, in the case of a horizontal screw conveyor that horizontally moves cement of a cement tanker, 100 to 200 rpm is preferable. If it is less than 100 rpm, the transport amount of cement per unit time is small, and it takes too much time to transfer the cement. Moreover, if it exceeds 200 rpm, the shake of a rotating shaft will become large and it will be easy to produce damage to the bearing part of a horizontal screw conveyor.
The shape of the spiral blade is arbitrary as long as it can be transported downward or upward within the cylinder by rotating with the rotation of the rotating shaft.

The kind of intermediate bearing is not limited. For example, various types of radial bearings, various types of thrust bearings, and various types of radial / thrust bearings that simultaneously receive both a radial load and a thrust load can be employed.
Further, the intermediate bearing is preferably a type in which the bearing is vertically divided into two along two dividing lines facing each other at an interval of 180 °, because assembly and maintenance on the rotating shaft are facilitated.
The intermediate bearing is preferably provided at the neck of the rotating shaft. The neck portion is a portion having a smaller diameter than the normal portion of the rotating shaft.

As the material of the beam material, various metals such as iron and steel can be adopted. The shape of the beam material is arbitrary. For example, a round bar, a square bar, a round pipe, a square pipe, etc. are mentioned.
The beam member may be fixed to the left side plate and the right side plate of the cylinder main body inseparably, or may be detachably connected by a bolt or the like. The maintenance of the intermediate bearing becomes easier when it is detachable.
The horizontal position of the beam member in the internal space of the cylindrical body is arbitrary as long as it is above the intermediate bearing because it is necessary to suspend the intermediate bearing.
The type of the bearing suspension is arbitrary as long as the intermediate bearing can be suspended from the beam material. For example, a wire tie material such as a wire, cable, or belt can be employed. In addition, various bar materials may be used.

According to the first aspect of the invention, the upper part of the intermediate bearing is covered with the upper part holder, and the lower part of the intermediate bearing is covered with the lower part holder in a detachable connection state with respect to the upper part holder. Thereby, an intermediate bearing is coat | covered from the circumferential direction by the bearing holder of the upper and lower halves.
At this time, each of the hooking claws of the pair of L-shaped suspension plates extending downward from both ends in the length direction of the beam member is paired with a pair of left and right holders each composed of an upper partial recess and a lower partial recess. Hang in the recess. Accordingly, the intermediate bearing is firmly suspended from the beam member via the pair of L-shaped suspension plates and the bearing holder.
In addition, the bearing holder is thus divided into two in the vertical direction by the upper part holder and the lower part holder, and a pair of holder latching recesses into which the latching claws of each L-shaped suspension plate are inserted are each supported. Since the upper partial recess and the lower partial recess formed in a step shape on the tip surface of the projecting piece are divided into two in the vertical direction, the connection of the intermediate bearing to the beam material and the release thereof are simplified. As a result, the maintenance of the intermediate bearing performed by opening the cover plate is facilitated, and the operation time can be shortened.

As a material of the bearing holder (upper part holder and lower part holder), iron, steel, cast iron, stainless steel and the like can be adopted.
As a detachable connection structure between the upper part holder and the lower part holder, for example, a bolt-nut structure, a fitting structure between a concave part and a convex part, or the like can be adopted.
The support protrusions (upper part protrusions and lower part protrusions) may be integrally formed of the same material as the bearing holder (upper part holder and lower part holder), or may be formed separately. May be.
The shape of the support projecting piece (the upper partial projecting piece and the lower partial projecting piece) is a square bar having a square cross section.
The shape of the holder latching concave portion (the upper partial concave portion and the lower partial concave portion) is arbitrary. For example, a rectangular cross section, a circular arc cross section, or the like may be used.
The L-shaped suspension plate may be integrally connected with the same material as the beam material or may be connected separately.
The shape of the latching claw is appropriately changed according to the shape of the holder latching recess to be latched. For example, it may be rectangular or semicircular in plan view.
Each L-shaped suspending plate is used in a state where bent bent claws are opposed to each other.

According to a second aspect of the present invention , the intermediate bearing includes an inner ring fixed to a middle portion in the length direction of the rotating shaft, and an outer ring supported by the cylindrical body via the beam member and the bearing holder. A radial roller bearing in which a large number of rollers are rotatably sandwiched between each other, and one end surface in the axial direction of the radial roller bearing is formed by a bearing cover on one end side of an annular shape whose outer peripheral portion is fixed to the bearing holder. The other end surface in the axial direction of the radial roller bearing is covered with an inner space of the bearing cover on the one end side, and the other end side of the radial roller bearing is fixed to the bearing holder. The intermediate bearing unit for a horizontal screw conveyor according to claim 1, wherein the rotating shaft is inserted into the inner space of the bearing cover on the other end side by the bearing cover.

According to the second aspect of the present invention , since the radial roller bearing is adopted as the intermediate bearing, the expensive cemented carbide provided in the conventional sliding bearing becomes unnecessary, and the cost of the bearing can be reduced.
In addition, the friction resistance and frictional heat of the inner and outer rings are small compared to plain bearings. For example, a small amount (several milliliters) of grease is used several times a year using a hand-held grease gun. The number of injections and the amount of grease injected per time can be reduced. As a result, the maintenance cost of the intermediate bearing can be reduced. Further, since the number of grease injections and the amount of grease injection are small as described above, a grease supply unit is not required for the horizontal screw conveyor, and the equipment cost can be reduced. In addition, since the amount of grease injected is reduced, it is difficult for the grease to be mixed into the granular material being conveyed.
Furthermore, since the bearing cover on one end and the bearing cover on the other end are provided so as to cover the one end face and the other end face in the axial direction of the radial roller bearing, the entire area of both ends in the axial direction of the radial roller bearing is outward. Can be covered from. Thereby, it can prevent that the granular material which is conveying a cylinder penetrate | invades in a bearing through the both end surfaces of a radial roller bearing.

A radial roller bearing is a roller in which a large number of rollers are sandwiched between an inner ring and an outer ring using a circular retainer at a uniform angle and rotatable in the circumferential direction of the retainer.
The type of radial roller bearing is not limited. For example, a cylindrical roller bearing, a needle-shaped radial roller bearing, a tapered roller bearing self-aligning roller bearing, or the like can be employed. Moreover, a radial thrust roller bearing may be used.
In addition, the radial roller bearing is preferably a type in which the bearing is divided into upper and lower portions along two dividing lines facing each other at an interval of 180 ° because assembly and maintenance on the rotating shaft are facilitated. Of course, a non-divided type may be used.
In the case of a half-split radial roller bearing, the inner ring and the outer ring face each other at an interval of 180 °, and each is split into two parts (natural split) along two split lines inclined in opposite directions with respect to the axis. It is preferable to consist of a pair of upper and lower partial inner rings or a pair of upper and lower partial outer rings. In this way, if the inner ring and the outer ring are each divided in half, when the partial inner rings and the partial outer rings are connected to each other (the end faces are brought into contact with each other), the partial inner rings and the partial outer rings are fitted into each other. The alignment in the axial direction can be easily and reliably performed.

Also, when the inner rings are assembled by connecting the partial inner rings, the outer raceway surface appears on the outer peripheral surface of the inner ring, and when the outer rings are assembled by connecting the partial outer rings, The inner raceway surface appears. At this time, steps are generated on the butted end surfaces of both partial inner rings and the butted end surfaces of both partial outer rings. Therefore, when each roller passes through each step portion, an impact force having a predetermined magnitude acts on the roller and the inner and outer rings. However, the contact between each step of the inclined type inner and outer rings and each roller is not a line contact when half divided along two dividing lines parallel to the axis, as in the case of conventional intermediate bearings. This is a point contact. That is, each roller sequentially passes the dividing line on both raceway surfaces from one end to the other, so the impact force when each roller passes through each stepped portion is smaller than in the conventional product, Damage to the rollers, inner and outer rings is also reduced. Therefore, a smooth rolling state of the roller is ensured for a long time, and the life of the intermediate bearing can be extended.
The shape of the roller varies depending on the type of radial roller bearing.

  According to invention of Claim 1, an intermediate bearing is provided in the middle part of the length direction of a rotating shaft, a beam material is horizontally mounted on the upper part of the left side board of a cylinder, and the upper part of a right side board, The intermediate bearing is removably suspended by a bearing suspension. Therefore, even if the horizontal screw conveyor is elongated, the bending due to the weight of the screw is suppressed, and it is possible to prevent the long rotating shaft from moving. As a result, the vibration, wear and metal sound of the cylinder that occurs when the spiral blade contacts the inner peripheral surface of the cylinder are not generated, and the loosening of bolts placed at various locations on the conveyor and metal fatigue are suppressed. Can do.

In addition, the bearing suspension is not attached to the lid plate, but is attached to the beam material horizontally mounted on the upper part of the left side plate and the upper side of the right side plate of the cylinder body. It is distributed to the left side plate and the right side plate via the material, and deformation of the cylindrical body due to load concentration can be suppressed. If the bearing suspension is suspended from the lid plate, the support load of the intermediate bearing is concentrated on the lid plate, so that the lid plate is deformed and the rotation shaft is likely to be shaken. Further, in the type in which the bearing suspension is attached to the lid plate in this way, the upper surface opening of the cylinder body cannot be closed with the rotating shaft centered. In other words, after closing the cylinder body in advance, it is necessary to operate the part that protrudes outside the cover plate to move the bearing suspension vertically and adjust the suspension height of the intermediate bearing. is there. Since this operation must be performed in a closed state where it cannot be visually observed as described above, it is difficult to center the rotating shaft. However, in the present invention, since the bearing suspension is attached to the beam material, it is possible to easily center the rotating shaft with the bearing suspension with the cover plate opened.
Furthermore, the beam material is not horizontally mounted on the left side plate and the right side plate of the cylinder body at the height position passing through the screw axis, but is horizontally mounted on the upper side of the left side plate and the upper side of the right side plate. Therefore, the pressure of the granular material acting on the beam during the conveyor operation is small, and the damage to the beam due to use is small. That is, if the beam material is attached at a height position that passes through the axis of the screw, the contact frequency between the granular material flowing through the cylinder body and the beam material is high, and the weight of the granular material received from above also increases. As a result, the damage caused by the use of the beam material is more severe than when the beam material is arranged at the upper part of the cylinder body.

In particular, according to the first aspect of the invention , the upper part of the intermediate bearing is covered with the upper part holder, and the lower part of the intermediate bearing is covered with the lower part holder in a detachable connection state with respect to the upper part holder. Thus, the intermediate bearing is covered from the circumferential direction by the upper and lower divided bearing holders.
At this time, each of the hooking claws of the pair of L-shaped suspension plates extending downward from both ends in the length direction of the beam member is paired with a pair of left and right holders each composed of an upper partial recess and a lower partial recess. Hang in the recess. As a result, the intermediate bearing is firmly suspended from the beam material via the pair of L-shaped suspension plates and the bearing holder.
In this manner, the pair of holder latching recesses into which the latching claws of the pair of L-shaped suspension plates are inserted are formed as upper and lower partial recesses formed on the front end surfaces of the respective support projecting pieces of the assembly type bearing holder. Since it is divided into two in the vertical direction by the side partial recess, the connection of the intermediate bearing to the beam material and the release thereof are simplified. As a result, the maintenance of the intermediate bearing performed by opening the cover plate is facilitated, and the operation time can be shortened.

According to the second aspect of the present invention , since the radial roller bearing is adopted as the intermediate bearing, the expensive cemented carbide used in the conventional slide bearing becomes unnecessary, and the cost of the bearing can be reduced. .
In addition, the friction resistance and heat of the inner and outer rings are small compared to plain bearings. For example, a small amount of grease can be used several times a year using a grease gun that can be held by the operator. The number of grease injections per time can be reduced. As a result, the maintenance cost of the intermediate bearing can be reduced, and the grease supply unit is not required for the horizontal screw conveyor, so that the equipment cost can be reduced.
Further, since the amount of grease injected is reduced, it is difficult for the grease to leak from the intermediate bearing, and it is difficult for the grease to be mixed into the powder particles being conveyed.
Furthermore, since the one end surface and the other end surface in the axial direction of the radial roller bearing are covered with the pair of bearing covers, the entire area of both end surfaces in the axial direction of the radial roller bearing can be covered from the outside. Thereby, it can prevent that the granular material which is conveying a cylinder penetrate | invades in a bearing through the both end surfaces of a radial roller bearing.

It is a longitudinal cross-sectional view of the use condition orthogonal to the axis line of the intermediate bearing unit for horizontal screw conveyors concerning Example 1 of this invention. It is a perspective view of the intermediate bearing unit for horizontal screw conveyors concerning Example 1 of this invention. It is a longitudinal cross-sectional view along the axis of the intermediate bearing unit for horizontal screw conveyors which concerns on Example 1 of this invention. It is a top view of the use condition of the intermediate bearing unit for horizontal screw conveyors concerning Example 1 of this invention. It is a disassembled perspective view of the intermediate bearing which comprises a part of intermediate bearing unit for horizontal screw conveyors concerning Example 1 of this invention.

  Examples of the present invention will be specifically described below. Here, an intermediate bearing unit mounted on a horizontal screw conveyor that transports in a horizontal direction cement mounted on a cement tanker and loaded on a deck from a hold by a vertical screw conveyor is taken as an example.

  In FIG. 1, 10 is an intermediate bearing unit for a horizontal screw conveyor (hereinafter referred to as an intermediate bearing unit) according to Embodiment 1 of the present invention, and the intermediate bearing unit 10 is for conveying cement (powder particles) in the horizontal screw conveyor C. Among the screws 14 in which the spiral blades 13 are provided around the outer peripheral surface of the rotating shaft 12 that is housed in the cylindrical body 11 and extends in the horizontal direction, the middle portion in the length direction of the rotating shaft 12 is It is supported in a freely rotating manner in space.

Hereinafter, these components will be specifically described.
As shown in FIGS. 1 to 4, the horizontal screw conveyor C is arranged on the deck of a cement tanker that transports the cement manufactured in the cement manufacturing plant to the sea, and loads the cement transported to the departure port into each tanker's hold. At the same time, after landing at the destination, it is a horizontal transfer device that uses a plurality of vertical screw conveyors to unload the cement loaded from each hold onto the deck. In addition, the cement conveyed horizontally by the horizontal screw conveyor C at the time of unloading is once collected in each pumping tank arranged on the bow side and the stern side of the hull, and then unloaded from each pumping tank by a cement pumping device.

The horizontal screw conveyor C is supported in parallel with the floor surface of the deck by a plurality of elongate struts erected from the bow side to the stern side of the deck with a predetermined distance in the captain direction. A plurality of sway width suppression structures that suppress the influence of swaying by the waves of the cement tanker are disposed at the end of each column.
These swing width suppressing structures include a plurality of short link links whose respective lower end portions are pivotally supported at the tip ends of the corresponding support columns via a plurality of lower rotation shafts extending in the ship width direction, Each lower end portion is pivotally supported at the distal end portion of each connecting link member via a plurality of upper rotating shafts extending in the ship width direction, and each upper end portion is provided at a predetermined position in the length direction of the bottom portion of the cylindrical body 11. And a plurality of cylindrical support members welded to be separated from each other. Shaking in the ship direction of the horizontal screw conveyor C accompanying the shaking of the cement tanker is attenuated by each swing width suppressing structure disposed at the upper end of each column. That is, when the cement tanker hull sways (for example, pitching), each connecting link member arbitrarily rotates (oscillates) about each lower rotation axis, and each upper rotation axis centers. Each cylindrical body support member is arbitrarily rotated, and the swing width is mechanically suppressed. If the upper rotation shaft or the lower rotation shaft is changed to an axis extending in the ship length direction, it is possible to suppress not only the vibration of the cement tanker in the ship length direction but also the vibration in the ship width direction.

  The cylindrical body 11 is a long cylinder in which a bottom plate 15 having a semicircular cross section, a left side plate 16 disposed on the left side in FIG. 1, and a right side plate 17 disposed on the right side in FIG. It has a main body 18 and a long lid plate 19 that closes the upper surface opening of the cylinder main body 18. The cylinder body 18 and the cover plate 19 are made of steel plates or stainless plates as raw materials. A cement input port is formed at one end of the cylinder body 18 and a cement discharge port is formed at the other end (not shown). In addition, a window 20 for maintenance of the intermediate bearing 24 described later is provided in a region of the cover plate 19 facing the intermediate bearing unit 10. The opening of the window portion 20 is sealed by a window lid 22 using a plurality of left and right clamps 21.

The screw 14 is rotatable via one end side bearing provided at the center of one end plate of the cylinder 11 and the other end side bearing provided at the center of the other end plate of the cylinder 11. It is stored (not shown).
Moreover, the screw 14 is divided | segmented substantially equally in the length direction (FIG. 3). That is, the rotating shaft 12 and the spiral blade 13 are each divided in the length direction. The spiral blade 13 is continuously provided from one end portion to the other end portion of the rotary shaft 12 so that the cement can be smoothly loaded. The outer diameter of the spiral blade 13 is substantially the same as the inner diameter of the bottom plate 15 so that there is almost no residual feed of cement raw material.
The other end of the rotating shaft 12 protrudes outward from the other end plate of the cylinder 11. The projecting portion is connected to the output shaft of the motor M via a reduction gear. When the output shaft of the motor M rotates in a predetermined direction at a predetermined speed, the screw 14 supported by the one end side bearing, the other end side bearing, and each intermediate bearing 24 via the belt-type power transmission structure is cemented. Rotate in the loading direction.

  As shown in FIGS. 1 and 3, a small-diameter neck portion 23 is disposed in each divided portion of the rotating shaft 12, and these neck portions 23 are connected to each other through intermediate bearings 24 and bearing suspension tools 25. Further, by supporting (shaft-supporting) the beam material 26 horizontally mounted on the upper portion of the cylindrical body 11, blurring of the horizontally long rotating shaft 12 (screw) 14 during cement conveyance is suppressed. Each divided portion of the rotary shaft 12 and the neck portion 23 are fastened to the flanges 12a and 23a by a large number of bolts and nut structures B at a predetermined pitch in the circumferential direction. Each intermediate bearing 24 and each bearing holder 27 to be described later are divided into two equal parts in the vertical direction so that the assembly to the neck portion 23 and subsequent maintenance are easy.

Hereinafter, with reference to FIGS. 1 to 5, the intermediate bearing 24, the bearing suspension 25 and the beam member 26 will be described in detail. The intermediate bearings 24, the bearing suspensions 25, and the beam members 26 have the same structure, and therefore will be described by taking one as an example. First, the beam member 26 will be described.
As shown in FIGS. 1 and 2, the portion of the cylinder 11 in which the neck portion 23 is accommodated extends in the width direction of the cylinder body 18 to the upper portion of the left side plate 16 and the upper portion of the right side plate 17. The beam member 26 is laid horizontally. The beam member 26 is formed of a steel square pipe, and rectangular flanges 26a are integrally formed at both ends in the length direction. A pair of bolt holes 26b are formed at both ends of each flange 26a in the lateral direction.

In addition, rectangular bracket insertion holes 16a and 17a are formed in the arrangement area of the intermediate bearings 24 in the upper part of the left side plate 16 and the upper side of the right side plate 17, respectively, and each bracket insertion hole 16a and 17a has a cross section L. A pair of retaining brackets 28 made of a thick, rectangular steel block are welded in a fitting state in which only one end (inner side) in the thickness direction protrudes into the internal space of the cylinder body 18. . That is, the other end portion (outer side portion) in the thickness direction of each latching bracket 28 is disposed on the outer side of the cylinder body 18.
A latching protrusion 28 a of each flange 26 a of the beam member 26 is integrally formed at the lower end portion of the inner side surface of each latching bracket 28. In addition, a pair of bolt holes 28b penetrating the inner and outer surfaces and communicating with the corresponding bolt holes 26b are formed at both ends in the lateral direction (the length direction of the cylinder body 18) of each latching bracket 28, respectively. Has been. Each flange 26a is hooked to the hooking projection 28a of each hooking bracket 28, and two pairs of bolt nut structures B2 are respectively inserted into the bolt holes 26b, 28b in communication with each other. Using the nut structure B2, the flanges 26a and the corresponding latch brackets 28 are fastened. As a result, the beam member 26 is detachably mounted on the upper portion of the cylinder body 18. At this time, each bolt N structure B <b> 2 has each nut N disposed outside the cylinder body 18.
Each latch bracket 28 is divided into two in the thickness direction, and each inner portion is welded to the upper inner surface of the left plate 16 and the upper inner surface of the right plate 17 in a surface contact state. The outer portions may be welded to the outer surface of the upper portion of the left plate 16 and the outer surface of the upper portion of the right plate 17 in a surface contact state. In this case, a pair of communication holes that communicate with the bolt holes 26b are formed at predetermined positions of the left side plate 16 and the right side plate 17.

  As shown in FIGS. 3 and 5, the intermediate bearing 24 includes an inner ring 29 that is fitted to the outer peripheral surface of the intermediate portion in the length direction of the neck portion 23, an outer ring 30 that is fitted to the bearing holder 27, and an inner ring. A cylindrical roller bearing having a large number of cylindrical rollers (rollers) 31 interposed between the outer ring 30 and the outer ring 30 and a cage 32 that holds the cylindrical rollers 31 at a uniform interval (uniform angle) in the circumferential direction. is there. The intermediate bearing 24 is composed of a pair of partial bearings 24A in which each component constituting the intermediate bearing 24 is divided into upper and lower parts. Further, both end surfaces in the axial direction of the intermediate bearing 24 are closed in a state where the neck portion 23 is inserted into each inner space by a bearing cover 33A on one end of the ring and a bearing cover 33B on the other end of the ring. It is peeling off.

The inner ring 29 is composed of a pair of upper and lower halved cylindrical partial inner rings 29A. In addition, semicircular fitting grooves 29a are formed on the outer peripheral surfaces of both end portions in the axial direction of each partial inner ring 29A. Each fitting groove 29a is fitted with a semicircular partial clamp frame 34A for fastening the partial inner rings 29A to each other.
At the time of assembling the inner ring 29, these partial inner rings 29 </ b> A are abutted with each other so that the neck portion 23 is sandwiched from the outside, and this state is maintained, while being formed at the end of the partial clamp frame 34 </ b> A. Screw the bolts continuously into the bolt holes. Accordingly, the corresponding partial clamp frames 34A are integrated to form a pair of upper and lower clamp frames 34, and the inner ring 29 is assembled from the pair of upper and lower partial inner rings 29A by the tightening force by these clamp frames 34. At this time, an outer raceway surface a on which each of the cylindrical rollers 31 described later appears on a portion between the pair of clamp frames 34 on the outer peripheral surface of the inner ring 29.

The outer ring 30 is composed of a pair of upper and lower half-cylindrical partial outer rings 30A. Further, inner flanges 30a are formed at both ends in the axial direction of each partial outer ring 30A. Between the pair of inner flanges 30a, a storage space for a cage 32 is formed in which a large number of cylindrical rollers 31 described later are rotatably connected.
When the outer ring 30 is assembled, the corresponding partial outer ring 30A is fitted (fitted) to an upper partial holder 49 and a lower partial holder 51, which will be described later. Thereafter, the butting surfaces of the partial outer rings 30A are matched to cover a retainer 32 (described later) mounted on the inner ring 29 from the outside, and the upper partial holder 49 and the lower partial holder 51 are bolted while maintaining this state. The outer ring 30 is assembled by connecting. At this time, the inner raceway surface b on which each cylindrical roller 31 rolls appears on the inner peripheral surface of the outer ring 30.

Each cylindrical roller 31 is a cylindrical roller, and rolls on the outer raceway surface a on the outer peripheral surface of the inner ring 29 and on the inner raceway surface b on the inner peripheral surface of the outer ring 30, while centering on the axis of the intermediate bearing 24. And rotate. Therefore, the length of each cylindrical roller 31 is shorter than the width between the upper and lower clamp frames 34 disposed on the inner ring 29.
The cage 32 is made of an annular belt, and in a roller storage space formed by penetrating the inner and outer peripheral surfaces at an angular position (22.5 ° interval) equally divided into 16 in the circumferential direction. A total of 16 cylindrical rollers 31 are rotatably supported. The axis of each cylindrical roller 31 is parallel to the axis of the cage 32.
The cage 32 includes a pair of upper and lower halved cylindrical partial cages 32A. Eight cylindrical rollers 31 are arranged in each partial holder 32A.

At the time of assembling the cage 32, the partial cages 32A are arranged on the outer raceway surface a of the inner ring 29, and then the respective butted surfaces are aligned, and the partial cages 32A are screwed together while maintaining this state. By doing so, the cage 32 is assembled.
Each of the bearing covers 33A and 33B is a thick annular plate having a central portion arranged in a step shape outward. On the inner peripheral surface of each bearing cover 33A, 33B, a pair of annular seal members 35 that seal the gap between the inner peripheral surface and the outer peripheral surface of the neck portion 23 are provided in the axial direction of each bearing cover 33A, 33B. Are spaced apart from each other. Each seal member 35 is composed of a pair of upper and lower partial seal members that are half-annular.

Each seal member 35 is made of felt made of a mixture of 30% rayon and 70% wool. Since the blended hair having such a composition is employed, it has a high sealing performance with excellent wear resistance and durability. In addition, since the double seal structure includes two seal members 35 as one set, the function of preventing cement from entering the internal space of the intermediate bearing 24 can be enhanced as compared with the case of the single seal member 35. . Furthermore, each seal member 35 has a trapezoidal cross section so that it does not easily protrude from the pair of left and right seal grooves 33a formed on the inner peripheral surface of each bearing cover 33A, 33B when the screw rotates.
Each bearing cover 33A, 33B is composed of a pair of upper and lower half-cylindrical partial bearing covers 33C that are parallel to the axis. These partial bearing covers 33C are fastened to both end surfaces of the upper partial holder 49 and both end surfaces of the lower partial holder 51 by a plurality of bolts B3.

As shown in FIGS. 1 to 4, the bearing suspending tool 25 covers the intermediate bearing 24 from the circumferential direction, and has a cylindrical shape in which a pair of square bar-shaped support protrusions 40 extend from the left and right end sides. The upper ends of the bearing holder 27 and the beam member 26 in the longitudinal direction are welded to each of the lower ends, and a pair of holder latching recesses 41 disposed on the front end surfaces of the support projecting piece portions 40. It has a pair of left and right L-shaped suspension plates 43 on which hooking claws 42 to be hooked are formed.
The bearing holder 27 is a thick annular plate having a length of about one third of the neck portion 23. The outer diameter of the bearing holder 27 is the same as the outer diameter of each flange 23 a of the neck portion 23, and bearing covers 33 </ b> A and 33 </ b> B are disposed at both ends of the bearing holder 27. The outer peripheral surface of each flange 23 a and the corresponding outer peripheral surface of the bearing covers 33 </ b> A and 33 </ b> B are covered with a pair of cylindrical covers 44. Thereby, the penetration | invasion of the cement to the neck part 23 vicinity from the circumferential direction of the intermediate bearing 24 is prevented. The cylindrical cover 44 is detachably screwed to a corresponding member. In addition, a pair of separate seal members 35 are embedded in the outer peripheral surfaces of both end portions in the length direction of the respective bearing covers 33A and 33B in contact with the respective cylindrical covers 44 in a separated state. Each cylindrical cover 44 is divided into upper and lower parts by an upper part cover 46 and a lower part cover 47 screwed to the upper part cover 46.

The bearing holder 27 covers the upper part of the intermediate bearing 24, and a half-cylindrical upper part holder 49 having a pair of square bar-like upper part projecting pieces 48 extending from the left and right ends, and an upper part holder 49. A halved cylindrical lower part holder 51 that covers the lower part of the intermediate bearing 24 in a detachably connected state and has a pair of rectangular bar-like lower part protruding pieces 50 extending from the left and right end sides. Have. A pair of bolt holes are respectively formed in the intermediate portions in the length direction between the upper part holder 49 and the lower part holder 51. In each bolt hole, a corresponding bolt nut structure B1 is inserted, and the bolt nut structure B1 is tightened, so that a pair of support protrusions are formed from the upper partial protrusion 48 and the lower partial protrusion 50. Part 40 is assembled.
The holder latching concave portion 41 is formed in a stepped shape on the upper side concave portion 52 formed in a stepped shape on the lower side portion of the distal end surface of the upper partial protruding piece portion 48 and the upper side portion of the distal end surface of the lower partial protruding piece portion 50. The lower partial recess 53 is divided into upper and lower parts.
Each L-shaped suspension plate 43 is a thick plate material made of the same material as the beam material 26, and each lower end portion is bent at a right angle in the opposite direction to constitute a pair of latching claws 42. Between the upper part of the opposing surface of each L-shaped suspension board 43 and the lower surface of the center part of the length direction of the beam member 26, the right-angled triangular thick reinforcement rib which reinforces each L-shaped suspension board 43 54 is fixed.

Next, with reference to FIGS. 1-5, the horizontal transfer method of the cement by the horizontal screw conveyor C which concerns on Example 1 of this invention is demonstrated.
As shown in FIGS. 1 to 4, in the horizontal screw conveyor C, the output shaft of the motor M is rotated in a predetermined direction, and the screw 14 is rotated in the cement transfer direction at 100 to 200 rpm via the reduction gear. Thereby, the cement thrown in from the insertion port of the one end side of the horizontal screw conveyor C passes through the inside of the cylinder 11 with rotation of the screw 14, and is loaded out of the ship.
At this time, since each neck portion 23 of the rotating shaft 12 is rotatably supported by each beam member 26 via each bearing suspension 25 and each intermediate bearing 24, the horizontal screw conveyor C is elongated, Even if the screw 14 becomes long, the bending due to the weight of the screw 14 can be suppressed, and the long rotating shaft 12 can be prevented from shaking. As a result, the vibration, wear and metal sound of the cylindrical body 11 generated by the spiral blade 13 coming into contact with the inner peripheral surface of the cylindrical body 11 are not generated, the bolts arranged in various places of the horizontal screw conveyor C, and the metal Fatigue can be suppressed.

As shown in FIGS. 1 to 5, at the time of maintenance of each intermediate bearing 24, first, the window lid 22 of each window portion 20 disposed in the area facing the intermediate bearing unit 10 is opened, and an operator can pass through the opening. Each bearing holder 27 and each intermediate bearing 24 are disassembled while visually observing. That is, each bolt nut structure B1 is removed with a tool such as a spanner, and each bearing holder 27 is disassembled into an upper part holder 49 and a lower part holder 51. Thereafter, each intermediate bearing 24 is divided into an upper partial inner ring 29A constituting the upper partial bearing 24A, an upper partial outer ring 30A, an upper partial retainer 32A, etc., and a plate-side partial inner ring 29A constituting the lower partial bearing 24B. The lower partial outer ring 30A and the lower partial holder 32A are disassembled. Next, maintenance work is appropriately performed on the disassembled bearing holders 27, the intermediate bearings 24, and the corresponding neck portions 23.
If necessary, the beam member 26 may be removed from the upper space of the cylinder body 18 to perform maintenance work. That is, the bolts and nut structures B2 are removed, and the beams 26 are removed by releasing the latched state of the flanges 26a from the latch brackets 28.

As described above, the bearing suspension 25 is not attached to the lid plate 19 but is attached to the beam member 26 laid horizontally on the upper part of the left side plate 16 and the upper side of the right side plate 17 of the cylinder body 18. Therefore, the support load of the intermediate bearing 24 is distributed to the left side plate 16 and the right side plate 17 via the beam member 26, and deformation of the cylindrical body 11 due to load concentration can be suppressed. If the bearing suspension 25 is suspended from the lid plate 19, the support load of the intermediate bearing 24 is concentrated on only one lid plate 19, so that the lid plate 19 is deformed and accompanying this, the rotating shaft The 12 shaft cores are displaced, and the rotation shaft 12 is likely to be shaken.
Further, in the type in which the bearing suspension is attached to the lid plate 19, the upper surface opening of the cylinder body 18 cannot be closed with the rotary shaft 12 centered. That is, after the cylinder body 18 is closed in advance, for example, a portion projecting upward from the lid plate 19 is operated to move the bearing suspension vertically and adjust the suspension height of the intermediate bearing 24. Need to do. Since this operation must be performed in a closed state where visual inspection is not possible, it is difficult to center the rotary shaft 12. However, since the bearing suspension 25 is attached to the beam member 26 here, the rotation shaft 12 can be easily centered by the bearing suspension 25 with the cover plate 19 opened.

Further, as a method of supporting the rotating shaft 12 different from these, a horizontal arm (bearing holder) passing through the axis of the screw 14 is connected to the left side plate 16 and the right side, for example, as in Japanese Patent No. 5162048 previously acquired by the present applicant. A method of horizontally mounting on the plate 17 is conceivable. However, in this method, compared with the case of the beam member 26 laid horizontally on the upper portion of the cylinder main body 18, the pressure of the cement acting on the horizontal arm during the conveyor operation is increased. That is, the horizontal arm arranged below the mounting position of the beam member 26 has a high contact frequency with the cement flowing through the cylindrical main body 18, and the weight of the cement received from above becomes large. As a result, damage (deterioration) due to use is greater in the horizontal arm than in the beam member 26.
In addition, when replacing | exchanging the neck part 23, each bolt nut structure B is removed from the flange of a rotating shaft, and the flange of the neck part 23, and the neck part 23 is replaced | exchanged.

After the maintenance, each neck portion 23 is sandwiched between the upper partial bearing 24A and the lower partial bearing 24B to assemble the intermediate bearing 24. Thereafter, the intermediate bearing 24 is sandwiched between the upper partial holder 49 and the lower partial holder 51, Assemble the holder 27.
At this time, the latching claws 42 of the pair of L-shaped suspension plates 43 extending downward from both end portions in the length direction of the beam member 26 are made up of left and right parts each composed of an upper partial recess 52 and a lower partial recess 53. It hooks in a pair of holder latching recessed parts 41. As a result, the intermediate bearing 24 is firmly suspended from the beam member 26 via the pair of L-shaped suspension plates 43 and the bearing holder 27.
Thereafter, the bearing covers 33A and 33B are fastened to both end faces in the axial direction of the bearing holder 27 via a large number of bolt-nut structures B3. A pair of cylindrical covers 44 are screwed to the outer peripheral surface of each flange 23a and the corresponding outer peripheral surfaces of the bearing covers 33A and 33B. Thereby, it is possible to prevent cement from entering the inner space of the intermediate bearing 24 and the vicinity of the neck portion 23 from the periphery of the intermediate bearing 24.

Thus, the pair of holder latching recesses 41 into which the latching claws 42 of the pair of L-shaped suspension plates 43 are inserted are formed on the front end surfaces of the support projecting piece portions 40 of the assembly-type bearing holder 27. Since the upper partial recess 52 and the lower partial recess 53 are divided into two in the vertical direction, the connection of the intermediate bearing 24 to the beam member 26 and the release thereof are simplified. As a result, the maintenance of the intermediate bearing 24 performed by opening a part of the cover plate 19 is facilitated, and the operation time can be shortened.
In particular, since the maintenance work is performed through the opened window 20 here, the removal work of the cover plate 19 and the attachment work of the cover plate 19 after maintenance become unnecessary.

Further, since the radial roller bearing is adopted as the intermediate bearing 24, the expensive cemented carbide used in the conventional sliding bearing becomes unnecessary, and the cost of the intermediate bearing 24 can be reduced.
Further, by adopting the cylindrical roller bearing, the frictional resistance and frictional heat of the inner ring 29 and the outer ring 30 are smaller than that of the sliding bearing. For example, a horizontal screw that uses a grease gun that can be held by an operator several times or about 1000 hours. Even after the conveyor C is used, even a few milliliters of grease can be sufficiently used at one time, so that the number of grease injections per one period and the amount of grease injected per time can be reduced. As a result, the maintenance cost of the intermediate bearing 24 can be reduced. Moreover, the horizontal screw conveyor C does not require a grease supply unit, and the equipment cost can be further reduced.

Furthermore, since the pair of bearing covers 33A and 33B are disposed at both ends in the axial direction of the intermediate bearing 24, the entire area of both end faces of the intermediate bearing 24 can be covered from the outside. Thereby, it is possible to prevent the cement being conveyed through the cylindrical body 11 from entering the bearing through both end faces of the intermediate bearing 24.
Furthermore, since the gap between the inner peripheral surface of both bearing covers 33A and 33B and the outer peripheral surface of the rotary shaft 12 is sealed by the annular seal member 35, both bearing covers 33A and 33B are provided. As compared with the above, it is possible to further enhance the effect of preventing the rotation failure of the cylindrical roller 31 caused by the cement being transferred through the cylindrical body 11 entering the intermediate bearing 24.

  Furthermore, each latching bracket 28 is welded in a state in which it is fitted in each bracket fitting hole 16a, 17a, rather than being welded in a surface contact state to the inner surface side of each upper part of the left side plate 16 and the right side plate 17. is doing. For this reason, if there is a weld failure in the type that does not pass through the bracket insertion holes 16a and 17a, the support load (hanging load) of the neck portion 23 is concentrated on the defective portion, and in addition to this, the conveyor is operated. As a result of the fatigue fracture of the welded part caused by the vibration of the inner cylinder 11, the retaining bracket 28 is peeled off from the cylinder body 18, the screw 14 falls to the bottom plate 15, and the spiral blade 13 and the bottom plate 15 are moved. There is a risk of damage. When such an accident occurs, the screw 14 that is forced to perform a large-scale work is removed, and the cylinder 11 and the screw 14 need to be repaired or replaced. However, in the first embodiment, the latching brackets 28 each formed of a thick rectangular block are welded into the rectangular bracket insertion holes 16a and 17a so that there is an unacceptable level of welding failure. Even in the worst case, the latching bracket 28 is caught in the bracket insertion holes 16a and 17a and stops at the position, so that the above-mentioned accident can be prevented.

Further, when the beam members 26 are horizontally mounted on the upper portion of the cylinder body 18 as described above, the bolt holes communicated with each other in a state in which the flanges 26a are respectively hooked on the hooking projections 28a of the hooking brackets 28. 26b and 28b, each bolt and nut structure B2 is inserted and attached, and each flange 26a and each latching bracket 28 are fastened by these bolt and nut structures B2. The beam member 26 can be attached to and detached from the upper portion of the right side plate 17. In general, the beam member 26 can be firmly placed on the upper portion of the cylinder main body 18, while having a low coupling strength.
In addition, the bolt and nut structure B2 may be loosened due to the indefinite vibration of the cylinder 11 accompanying the conveyor operation, but the nut N of each bolt and nut structure B2 is located outward of the cylinder body 18. Even if it is not at the time of maintenance that is performed by opening the window 20, the looseness of the beam 26 can be detected at an early stage simply by checking the looseness of the nut N from the outside of the cylinder 11. Can do. Moreover, the looseness of the beam 26 can be eliminated by tightening the loosened nut N with a tool such as a socket as an emergency measure.

  The present invention is useful as an intermediate bearing unit for a horizontal screw conveyor for transferring various powder particles in the horizontal direction.

10 Intermediate bearing unit for horizontal screw conveyor,
11 cylinder,
12 rotation axis,
13 Spiral feather,
14 screws,
15 Bottom plate,
16 Left side plate,
17 Right side plate,
18 cylinder body,
19 Cover plate,
24 Intermediate bearing (radial roller bearing),
26 Beam material,
25 Bearing suspension,
27 bearing holder,
29 Inner ring,
30 outer ring,
31 Cylindrical rollers
33A Bearing cover on one end side,
33B Bearing cover on the other end side,
40 support protrusion,
41 Holder retaining recess,
42 Hanging pawl,
43 L-shaped hanging plate,
48 Upper part protruding piece,
49 Upper part holder,
50 Lower part protruding piece,
51 Lower part holder,
52 upper part recess,
53 Lower partial recess.

Claims (2)

Of the screw accommodated in the cylindrical body for conveying the granular material and having spiral blades provided around the outer peripheral surface of the rotating shaft extending in the horizontal direction, the cylindrical portion is disposed in the middle of the length direction of the rotating shaft. An intermediate bearing unit for a horizontal screw conveyor that is rotatably supported with respect to
The cylindrical body has a cylindrical body in which a bottom plate, a left side plate, and a right side plate are connected in a bowl shape, and a lid plate that closes an upper surface opening of the cylindrical body,
An intermediate bearing is provided in the middle of the rotating shaft,
Beam material is laid across the upper part of the left side plate and the upper side of the right side plate,
The intermediate bearing is detachably suspended from the beam member via a bearing suspension,
The bearing suspension is
A cylindrical bearing holder that covers the intermediate bearing from the circumferential direction, and a pair of support protrusions extend from the left and right end sides;
Each upper end is connected to both side portions of the beam material in the length direction, and the lower end is hooked to a pair of holder latching recesses arranged on the front end surface of each support projecting piece. A pair of left and right L-shaped suspension plates formed with claws,
The bearing holder is
Covering the upper part of the intermediate bearing, a half cylindrical upper part holder with a pair of square bar-like upper part protruding pieces extending from the left and right end sides;
A halved cylindrical lower part in which the lower part of the intermediate bearing is covered with the upper part holder in a detachable manner, and a pair of lower part protruding pieces in the form of square bars extend from the left and right ends. A holder,
The holder latching recess is formed in a stepped shape in the upper part recessed part formed in a step shape on the lower side part of the tip surface of the upper part protruding piece part and in the upper side part of the tip surface of the lower part protruding piece part. An intermediate bearing unit for a horizontal screw conveyor, which is divided into two upper and lower recesses. The intermediate bearing includes a large number of rollers between an inner ring fixed to a middle portion in the length direction of the rotating shaft and an outer ring supported by the cylindrical body via the beam member and the bearing holder. A radial roller bearing that is rotatably held.
One end surface in the axial direction of the radial roller bearing is in a state in which the rotating shaft is inserted into the inner space of the bearing cover on one end side by an annular bearing cover on one end side of which the outer peripheral portion is fixed to the bearing holder. Covered,
The other end surface in the axial direction of the radial roller bearing is inserted into the inner space of the bearing cover on the other end side by an annular bearing cover on the other end side whose outer peripheral portion is fixed to the bearing holder. The intermediate bearing unit for a horizontal screw conveyor according to claim 1 , covered in a state.

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