KR20210069840A - screw conveyor have a back-draft prevention function - Google Patents

Abstract

The present invention relates to a backflow prevention device for a screw conveyor capable of preventing a transfer object from flowing backward in the opposite direction to the transfer direction in the process of transferring a transfer object containing sewage contaminants (sludge). More particularly, the present invention relates to a backflow prevention device for a screw conveyor, which not only prevents a transfer object from the screw conveyor installed at an angle to an outlet from flowing back to an inlet through a space between a screw blade and a cover, but also prevents the transfer efficiency from dropping by installing an oilless bearing for sealing at the inclined lower end, and installing a sealing structure connecting a shaft to the lower end of a hollow shaft motor at the upper end.

Description

Backflow prevention device of screw conveyor {screw conveyor have a back-draft prevention function}

The present invention relates to a screw conveyor, and more particularly, a device for preventing backflow of a screw conveyor capable of preventing the object to be transferred from flowing backward in the opposite direction to the transfer direction in the process of transferring the object to be transferred including sewage contaminants (sludge) is about

A screw conveyor is a device that installs a screw shaft inside a semi-circular case and rotates the screw shaft, so that a spiral-shaped screw blade pushes and conveys an object to be conveyed inside the case. Grain, cement, molasses, asphalt or It is used to transport sewage contaminants (sludge), etc.

Examples of the technology related to such a screw conveyor include Patent Documents 1 to 3.

Patent Document 1 includes a trough in which a cleaning hole is formed at one end, a discharge port is formed at the other end, and the magnet plate is welded or bolted to both open ends in the longitudinal direction; a cover welded or bolted to the upper open end of the trough in the height direction, an inspection port is formed at an arbitrary point, and a supply port is formed at a point corresponding to the cleaning port; It is a screw conveyor for feeding fibrous feed consisting of screws whose both ends are freely supported on both ends of the trough.

Patent Document 2 discloses that, in a screw conveyor device for work, it is formed in a horizontally arranged tubular shape and is opened upwardly at the upper portion to extend along the extended length for inputting the spectroscopy, and discharges the inputted spectroscopy at the lower portion in the longitudinal direction. The casing part with an outlet for performing the function is rotatably mounted inside the casing part while both ends are supported by the first bearing and the second bearing mounted on both ends of the casing part, and a screw is formed on the outer circumferential surface to rotate and discharge the injected spectroscopy. a transfer unit including a rotating shaft unit for transferring to the side; a driving unit disposed on one side of the casing unit to provide a driving force required to rotate the rotating shaft unit; and a leg part mounted on the casing part to support the casing part to be positioned at a certain height, and a leg part equipped with a moving wheel at the lower end; it is horizontally disposed and is mounted to cover the open upper part of the casing part, and the input spectroscopy is inside the casing part It is a screw conveyor device further comprising;

Patent Document 3 discloses a shaftless screw conveyor for sludge transfer in which a universal joint is installed between a shaftless screw tip installed inside a casing and a drive shaft connected to a drive motor; A torque sensor is installed between the tip of the shaftless screw and the drive shaft, and the drive speed of the drive motor is proportionally controlled according to the torque change detected by the torque sensor, but when an abnormal torque is detected, the operation of the drive motor is stopped. A synthetic resin liner is inserted, and a non-contact metal sensor that can detect the wear state of the synthetic resin liner is installed on the outside of the casing. It is a shaftless screw conveyor for sludge transfer that is designed to send a signal.

Such a conventional screw conveyor technology basically includes a screw shaft inside the case, and a driving means is installed at one end of the case to rotate the screw shaft. do.

Such a screw conveyor has a cover on the upper part of the case to prevent the object to be transferred from coming out, but a space is formed between the cover and the screw blade so that when the object is transported by the rotation of the screw shaft, the object to be transferred is between the screw blade and the cover. There was a problem of backflow through the space in the opposite direction to the conveying direction.

In particular, in the case of a screw conveyor with a high inclination, such a backflow shape is severe and the transport efficiency of the transported object is reduced, or when the reversed transported metabolite is sewage sludge, it is discharged out of the screw conveyor and contaminates the surroundings.

Republic of Korea Patent Publication No. 10-2017-0108722 Republic of Korea Patent No. 10-1752606 Republic of Korea Patent Registration No. 10-1995943

The present invention is to solve the problems of the prior art as described above, and provides a backflow prevention device for a screw conveyor capable of preventing the object to be transferred from flowing backward in the opposite direction to the transfer direction in the process of transferring the object to be transferred, such as sewage sludge. aim to do

In particular, the present invention prevents a gap between the bottom surface of the conveyor cover and the screw blades from being formed in a screw conveyor installed with a high inclination, thereby preventing the object to be transported being pushed toward the outlet from flowing back into the space between the bottom surface of the conveyor cover and the screw blades. An object of the present invention is to provide a backflow prevention device for a screw conveyor.

Another object of the present invention is to provide a backflow prevention device for a screw conveyor that prevents the filtrate from flowing out of sewage such as sewage sludge by installing a sealing part on the inclined inlet side and sealing it.

Another object of the present invention is to provide a backflow prevention device for a screw conveyor capable of preventing damage to the motor by assembling a shaft with a hollow shaft motor that allows the position of the motor constituting the driving means to be positioned above the case. do it with

A device for preventing backflow of a screw conveyor according to the present invention for solving the above object includes a case installed at an angle, and a screw installed inside the case and rotated by driving of a driving means to transfer the object to be transported inside the case. In the screw conveyor configured including a shaft, the case has vertical walls on both sides of a semi-circular arc-shaped bottom, an accommodation space is formed therein, and an opening is formed at the upper part,

A backflow prevention cover having an inlet on one side is detachably installed in the opening of the case, and the backflow prevention cover is formed with a semi-circular groove having the same diameter as the inner diameter of the case to form a circular space when installed in the case. It is characterized in that the reverse flow of the object to be transferred is prevented between the backflow prevention cover when the screw blade rotates to transfer the object to be transferred.

It is preferable that the upper end of the case is fitted and a case insertion hole is formed on both edges in the longitudinal direction of the bottom surface of the backflow prevention cover.

The backflow prevention cover and the case were coupled as a piece, but the coupling means forms a long groove at both ends of the case, and both ends of the backflow prevention cover surrounding the case are slid and coupled with the groove to have a """ shape. It is also preferable, and it can be combined in various forms.

The driving means is installed on the upper end of the inclined case, and the hollow shaft motor for generating power and the screw shaft are coupled eccentrically downward from the rotation shaft of the hollow shaft motor, it is preferable to be installed so as to be sealed.

Sealing portions are formed at both ends of the case, the lower sealing portion of the case is connected to the screw shaft shaft is inserted into the oilless bearing, the case sealing blocking plate is coupled to the lower end of the case by a piece, the case sealing blocking plate The oilless bearing is installed through the through hole formed in the center of the oilless bearing, and a sealing part is formed by inserting the oilless bearing into the cover of the oilless bearing by interposing a sealing gasket between the case sealing plate and the oilless bearing cover. Preferably, it is installed so that the screw shaft shaft is rotatably supported inside the less bearing.

In addition, it is preferable that the upper end of the case is connected to the case through a gasket and a duct to the driving unit connected to the hollow shaft motor and a sealing unit is installed.

The screw conveyor according to the present invention prevents a gap between the screw blade and the bottom of the backflow prevention cover, which is detachably installed on the upper part of the case, so that the transported object pushed toward the outlet flows back between the screw blade and the backflow prevention cover to the inlet side. This has the effect of preventing it from coming back.

In addition, the present invention prevents water leakage by installing a sealed gasket between the case and the case sealing plate, installing an oilless bearing for rotatably supporting the screw shaft on the case sealing plate, and installing an oilless bearing on the outside of the oilless bearing By installing a sealing gasket between the bearing cover and the case sealing plate, it is possible to prevent contaminated water from leaking to the outside through the oilless bearing.

In addition, the present invention consists of a drive means consisting of a hollow shaft motor and a gear assembly, installed so that the screw shaft of the gear assembly is coupled to the bottom of the hollow shaft motor, and as the motor is installed at a higher position than the case, sewage sludge transferred inside the case There is also an effect that can prevent the hollow shaft motor from being damaged by preventing the object to be transported from approaching the hollow shaft motor.

1 is a perspective view of an example of a screw conveyor having a backflow prevention device according to the present invention;
2 is an exploded perspective view of an example of a screw conveyor having a backflow prevention device according to the present invention;
3 is a perspective view of a driving part of an example of a screw conveyor having a backflow prevention device according to the present invention;
4 is an exploded perspective view of an inlet sealing part of an example of a screw conveyor according to the present invention;
5 is a coupling view of an inlet side sealing part of an example of a screw conveyor having a backflow prevention device according to the present invention;
Figure 6 (a) is an exploded view of an AA' section of an example of a screw conveyor having a backflow prevention device according to the present invention;
Figure 6 (b) is a cross-sectional view of an example AA' of a screw conveyor having a backflow prevention device according to the present invention.
Figure 6 (c) is a cross-sectional view AA' of an example of a conventional screw conveyor cover
7 is another coupling structure diagram for coupling a backflow prevention cover to a case in a screw conveyor having a backflow prevention device according to the present invention;

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and will be described with reference to the detailed description. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

In describing each drawing, the same reference numerals are used for the same components. In describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

As shown in Fig. 6(c), in the conventional screw conveyor, a counterflow space is formed between the screw blade and the cover, so in the case of an inclined screw conveyor, the objects to be transported to the outlet through the counterflow space on the screw blade overflow and flow backwards. Because the backflow space part is eliminated by the backflow prevention cover 40 as shown in FIGS. 6(a) and 6(b) of the present invention to block the inlet or pollute the surroundings by overflowing, the transported objects transported toward the outlet are It was transported well and the sealing part 16 was installed at the lower end so that the contaminated water and the like did not flow out.

The present invention prevents backflow space between the bottom surface of the backflow prevention cover 40 and the screw blade 21 so that a transfer object such as sewage sludge pushed toward the outlet is transferred between the screw blade 21 and the backflow prevention cover 40. backflow can be prevented.

As shown in Figs. 1 to 2, the backflow prevention device of the screw conveyor according to the present invention includes a case 10 installed at an angle; A screw blade 21 is installed on the outer circumferential surface and installed inside the case and rotated by the driving of the driving means 30 to transport the object to be transported, such as sewage sludge supplied to the inside of the case. .

As shown in FIGS. 1 to 2, the case 10 has vertical walls 12 formed on both sides of the semi-circular arc-shaped bottom 11 to form an accommodating space therein, and the upper part is opened to open the opening 13 ) is formed.

That is, the case 10 is provided with an arc-shaped bottom portion 11 having a diameter equal to or somewhat larger than the outer diameter of the screw blade 21 of the screw shaft 20, so that the screw blade 21 and the arc-shaped bottom portion 11 are provided. Since there is no gap between the screw blades 21, the object to be transported, such as sewage sludge, moves to the outlet side.

Both sidewalls of the case 10 are installed vertically, and as shown in FIG. 2 , the upper part is opened to form an opening 13 , and a backflow prevention cover 40 is provided in the opening 13 . installed detachably.

A semi-circular groove 42 is formed on the bottom surface of the backflow prevention cover 40 .

The backflow prevention cover 40 is detachably installed in the opening 13 of the upper end of the case 10 as shown in FIG. 2 , an inlet 41 is formed on one side, and the semi-circular groove 42 on the bottom surface. ) is formed long in the longitudinal direction so that the semi-circular groove 42 has the same diameter as the inner diameter of the arc-shaped bottom 11 of the case, so that there is no backflow between the ends of the screw blades 21. While maintaining the state, as it is rotated toward the outlet 14 and transferred, the object to be transferred does not flow back between the screw blade 21 and the semi-circular groove 42 .

The semicircular groove 42 has the same diameter as the inner diameter of the arc-shaped bottom 11 of the case.

The inner diameter of the semi-circular groove 42 is preferably equal to or somewhat larger than the outer diameter of the screw blade 21 , and friction between the screw blade 21 and the semi-circular groove 42 is prevented when the screw shaft 20 is rotated. It is desirable to maintain a gap of about 1 to 5 mm that does not cause backflow.

As described above, the backflow prevention cover 40 is detachably installed in the opening 13 of the case 10 , and must be firmly coupled to the case 10 .

The method of coupling the backflow prevention cover 40 to the case 10 can be carried out by various modifications, and one of the methods is to make the backflow prevention cover 40 correspond to the opening 13 of the case 10 . After positioning, it is fixed with a fixing means, and a screw or bolt may be used as the fixing means.

In another method, the backflow prevention cover 40 is coupled to a structure that prevents a gap between the backflow prevention cover 40 and the opening 13 of the case 10 by maintaining the state hooked on the upper end of the case 10 . It is preferable to form a structure, an example of which is, as shown in FIGS. 2, 6 (a), (b), both edges in the longitudinal direction of the bottom surface of the backflow prevention cover (40) of the case (10) The upper end is to form a case insertion hole 43 that is fitted and coupled.

In this way, when the case insertion hole 43 is formed at both ends of the backflow prevention cover 40, and a fixing means such as a fixing screw or bolt is installed in only a part of the case 10 in the state where the upper end of the case 10 is fitted in the case insertion hole 43, the backflow prevention cover The backflow prevention cover 40 can be firmly coupled to the case 10 without creating a gap between the 40 and the opening 13 .

Another coupling structure for coupling the backflow prevention cover 40 to the case 10 is, as shown in FIG. 7 , both ends of the backflow prevention cover 40 in the longitudinal direction are bent toward the sidewall of the case 10 . A coupling port 44 for preventing backflow is formed, and case coupling grooves 15 are formed on both side walls of the case 10 .

That is, both ends of the backflow prevention cover 40 may be formed to have a "" shape so that they are slidably coupled to the case coupling groove 15, and may be coupled in various other forms.

The coupling structure configured in this way aligns the backflow prevention cover 40 to one end of the case 10. After aligning the backflow prevention cover coupling hole 44 to correspond to the case coupling groove 15, the backflow prevention cover 40. The backflow prevention cover 40 is coupled to the case 10 by pushing the backflow prevention cover coupling hole 44 toward the case 10 to slide and fit into the case coupling groove 15 . At this time, it is possible to prevent the backflow prevention cover 40 from flowing down to the lower side of the case 10 by tightening one or more bolts to the sidewall in a state in which the backflow prevention cover 40 completely covers the opening 13 of the case.

In addition, the device for preventing backflow of the screw conveyor of the present invention configured as described above can be used not only to transport a moisture-rich transport object including sewage contaminants (sludge), but also to transport a dry transport object.

At this time, contaminated water discharged from the object to be transported flows toward the driving means 30 for rotating the screw shaft 20 , and the driving means 30 may be contaminated and damaged.

Accordingly, sealing parts 16 and 17 are provided at both ends of the case 10, respectively.

Among the sealing parts 16 and 17, the lower sealing part 16 of the case is coupled to the lower end of the case 10 via a sealing gasket 165, as shown in FIGS. 4 and 5 . Oilless bearing 162 to which the shaft of the sealing blocking plate 161 and the screw shaft 20 penetrating the through hole formed in the center of the case sealing blocking plate 161 is inserted and connected; Installed between the case sealing blocking plate 161 and the oilless bearing cover 163 into which the oilless bearing 162 is inserted and installed, and the case sealing blocking plate 161 and the oilless bearing cover 163 . It is composed of a sealed gasket (164).

The oilless bearing 162 supports one end of the screw shaft 20 and functions as a bearing so that it can rotate, and the screw shaft 20 can be rotated through a through hole formed in the case sealing plate 161 . strongly support

In addition, it is preferable that a sealing gasket 164 is interposed and a bearing cover 163 is further installed to prevent leakage of water between the oilless bearing 162 and the case sealing plate 161 .

Among the sealing parts 16 and 17 , the upper sealing part 17 of the case 10 is installed at the top of the case 10 to seal the top of the case 10 , the duct 171 , and the duct 171 . ) and a sealed gasket 172 installed between the upper end of the case.

Of course, a through hole through which the screw shaft 20 passes is formed in the duct 171 , and the screw shaft 20 passing through the through hole is connected to the driving means 30 .

In addition, the driving means 30 of the present invention is preferably installed at the end of the case 10 in the direction in which the relatively high outlet 14 is formed.

In addition, the driving means 30 is preferably composed of a hollow shaft motor 31 for generating power, and a gear assembly 32 installed eccentrically from the rotating shaft of the motor to which the screw shaft 20 is coupled.

As shown in FIG. 3 , the driving means 30 has the output shaft of the gear assembly 32 coupled to the screw shaft 20 , and the hollow shaft motor 31 is installed above the gear assembly 32 to provide a hollow The shaft motor 31 is installed higher than the case 10 .

In this way, the contaminated water leaking from the case 10 does not flow into the hollow shaft motor 31 , thereby preventing damage due to contamination of the hollow shaft motor 31 .

10: case
11: arc bottom 12: vertical wall 13: opening
14: outlet 15: case coupling groove
16: lower sealing portion 161: case sealing blocking plate 162: oilless bearing
163: bearing cover 164: gasket 165: sealing gasket
17: upper sealing portion 171: case sealing closure plate 172: sealing gasket
20: screw shaft
30: drive means 31: hollow shaft motor 32: gear assembly
40: backflow prevention cover
41: inlet 42: semi-circular groove 43: case insert
44: cover coupling for preventing backflow

Claims (6)

It includes a case 10 installed inclinedly, and a screw shaft 20 installed inside the case 10 and rotating by the driving of the driving means 30 to transport the object to be transferred supplied to the inside of the case 10 . In the screw conveyor constructed by
The case 10 is formed with vertical walls 12 on both sides of the semi-circular arc-shaped bottom 11 to form a receiving space therein, and the upper part is opened to form an opening 13,
At both ends of the case 10, sealing parts 16 and 17 are formed,
A backflow prevention cover 40 having an inlet 41 formed on one side of the opening 13 of the case 10 is detachably installed,
The backflow prevention cover 40 is formed with a semi-circular groove 42 having the same diameter as the inner diameter of the case 10 to form a circular space when installed in the case 10, so that the screw blade 21 A device for preventing backflow of a screw conveyor, characterized in that it prevents the object to be transferred from flowing back between the screw blades 21 and the cover for preventing backflow when the is rotated to transfer the object to be transferred. According to claim 1,
A backflow prevention device for a screw conveyor, characterized in that at both edges in the longitudinal direction of the bottom surface of the backflow prevention cover (40), a case insertion hole (43) to which the upper end of the case (10) is fitted and coupled is formed. According to claim 1,
On both sides of the longitudinal direction of the backflow prevention cover 40, a backflow prevention cover coupling hole 44 bent toward the sidewall of the case 10 is formed, and the backflow prevention cover is coupled to both side walls of the case 10. A backflow prevention device for a screw conveyor, characterized in that a case coupling groove (15) to which the sphere (44) is slid and coupled is formed. According to claim 1,
The driving means 30 is installed on the upper end of the inclined case 10, the hollow shaft motor 31 for generating power, and the screw shaft 20 is installed eccentrically downward from the rotation shaft of the motor is coupled. Consists of a gear assembly 32, characterized in that the hollow shaft motor 31 is installed on the case 10 so as to be able to protect the hollow shaft motor 31 from the transfer object flowing down from the case 10 Backflow prevention device of screw conveyor. According to claim 1,
Sealing portions 16 and 17 are formed at both ends of the case 10, respectively,
The lower end sealing part 16 of the case includes a case sealing blocking plate 161 that is coupled to the lower end of the case 10 through a sealing gasket 165, and a through hole formed in the center of the case sealing blocking plate 161. an oilless bearing 162 to which the shaft of the screw shaft 20 passing through the hole is inserted and connected; Installed between the case sealing blocking plate 161 and the oilless bearing cover 163 into which the oilless bearing 162 is inserted and installed, and the case sealing blocking plate 161 and the oilless bearing cover 163 . A backflow prevention device of a screw conveyor, characterized in that it is composed of a sealed gasket (164). 7. The method of claim 6,
The upper end sealing portion 17 of the case 10 includes a duct 171 installed at the upper end of the case to seal the upper end of the case, and a sealing gasket 172 installed between the duct and the upper end of the case. Backflow prevention device of screw conveyor with

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