KR20120063719A - System for handling bisphenol-a - Google Patents

System for handling bisphenol-a Download PDF

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Publication number
KR20120063719A
KR20120063719A KR1020100124816A KR20100124816A KR20120063719A KR 20120063719 A KR20120063719 A KR 20120063719A KR 1020100124816 A KR1020100124816 A KR 1020100124816A KR 20100124816 A KR20100124816 A KR 20100124816A KR 20120063719 A KR20120063719 A KR 20120063719A
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KR
South Korea
Prior art keywords
bpa
bucket
handling system
storage tank
pressure
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KR1020100124816A
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Korean (ko)
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KR101220962B1 (en
Inventor
신승대
Original Assignee
동양피엔에프 주식회사
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Priority to KR1020100124816A priority Critical patent/KR101220962B1/en
Publication of KR20120063719A publication Critical patent/KR20120063719A/en
Application granted granted Critical
Publication of KR101220962B1 publication Critical patent/KR101220962B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/04—Sorting according to size
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G17/00—Conveyors having an endless traction element, e.g. a chain, transmitting movement to a continuous or substantially-continuous load-carrying surface or to a series of individual load-carriers; Endless-chain conveyors in which the chains form the load-carrying surface
    • B65G17/12—Conveyors having an endless traction element, e.g. a chain, transmitting movement to a continuous or substantially-continuous load-carrying surface or to a series of individual load-carriers; Endless-chain conveyors in which the chains form the load-carrying surface comprising a series of individual load-carriers fixed, or normally fixed, relative to traction element
    • B65G17/126—Bucket elevators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G17/00—Conveyors having an endless traction element, e.g. a chain, transmitting movement to a continuous or substantially-continuous load-carrying surface or to a series of individual load-carriers; Endless-chain conveyors in which the chains form the load-carrying surface
    • B65G17/30—Details; Auxiliary devices
    • B65G17/32—Individual load-carriers
    • B65G17/36—Individual load-carriers having concave surfaces, e.g. buckets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
    • B65G2201/04—Bulk
    • B65G2201/042—Granular material

Abstract

PURPOSE: A BPA(Bisphenol-A) handling system is provided to effectively and safely distribute BPA having explosiveness to demanding places. CONSTITUTION: A BPA handling system(100) comprises a screen device(110), a pressure loss preventing part(120), a bucket conveyor(130), a distribution conveyor(140), a storage tank(150), and a pressure holding part. The screen device assorts size of BPA supplied from a prilling tower(10). The pressure loss preventing part is installed in a line through which the BPA is transferred from the screen device. The pressure loss preventing part allows the BPA to pass and shuts off pressure loss to the screen device side. The bucket conveyor vertically ascends the BPA passing through the pressure loss preventing part. The distribution conveyor horizontally transfers the BPA transferred from the bucket conveyor. The BPA discharged through the distribution conveyor is supplied to the storage tank from the upper part.

Description

BP handling system {SYSTEM FOR HANDLING BISPHENOL-A}

The present invention relates to a BPA handling system that is made of granular material and allows for efficient and safe handling for distributing explosive BPA to customers.

In general, bis (4-hydroxyaryl) alkanes called bisphenols are very important as starting materials or intermediates for producing many commercial products and can be prepared by condensation of phenols and carbonyl compounds. In particular, 2,2-bis (4-hydroxyphenyl) propane (bisphenol A, hereinafter referred to as 'BPA'), a condensation product from the reaction between phenol and acetone, is of industrial importance.

Such BPAs are used as starting materials for producing many different types of polymeric materials such as polyarylates, polyetherimides, polysulfones and modified phenol / formaldehyde resins, and applications include epoxy resins and polycarbonates. Preparation of the product. In particular, polycarbonates are widely used in a variety of mechanical parts, optical discs, automotive parts, food containers and other applications because of their good mechanical properties, such as good impact resistance, heat resistance and transparency.

In addition, BPA is converted into granules such as granules for distribution, distribution, and distribution to demand destinations for ease of storage, transport, and handling.BPA granules are not only difficult to handle due to their properties, but also explosive. Attention must be paid to the handling.

Therefore, there is a need for the development of a system that handles the distribution of BPA safely to demand.

The present invention is to solve the conventional problems as described above, so that the handling for distributing the BPA made of granular material to the demand destination can be made efficiently and safely.

According to an aspect of the present invention for achieving the above object, in the system for handling the BPA made of granular material, the particle size sorter for selecting the size of the BPA supplied from the frill tower, and the line BPA is transferred from the particle size sorter A pressure loss blocking unit for blocking the pressure loss toward the particle size selector while allowing the passage of the BPA, a bucket conveyor for vertically raising the BPA passing through the pressure loss blocking unit, and a BPA transferred from the bucket conveyor. A distribution conveyor for transporting in the horizontal direction, a BPA discharged through the distribution conveyor is supplied from the upper side, a storage tank for unloading the BPA to the transfer means through the unloading line, and from the pressure loss blocking portion to the storage tank from the outside Supply pressure maintaining purge gas to BPA's moving path formed to maintain airtightness It is provided with a BPA handling system characterized by including a pressure maintenance.

The pressure loss blocking unit is installed inside the rotor having a plurality of blades for conveying the BPA to rotate by the drive of the rotary motor, characterized in that the blade alternately blocks the inside when the rotor rotates. do.

The bucket conveyor, the chain is installed on both sides in the main body by the drive motor for infinitely orbital movement, a plurality of buckets are fixed to the chain, the link members fixed to both sides of the bucket horizontally by hinged coupling with each other The buckets are connected to each other, and an opening for injecting BPA is formed at an upper portion of the bucket, and a guide part is formed to be inclined toward an opening of a bucket adjacent to one side of the opening to guide opening of the BPA. It is characterized by.

The main body is characterized in that the horizontal portion formed horizontally on the lower end and the upper end of the vertical portion is formed vertically.

The bucket conveyor is characterized in that the scraper is formed vertically on the upper part of the bucket of the bucket.

The distribution conveyor, the belt is installed to the endless track movement by the drive motor on both sides of the main body, the transfer plate for transferring the BPA to the belt is fixed to a plurality of spaced intervals vertically, the storage at the bottom of the main body It is characterized in that the outlet is connected to each tank is provided in plurality at intervals along the longitudinal direction.

The distribution conveyor is characterized in that the discharge valve is installed in the discharge port.

The storage tank is characterized in that a plurality of unloading line is provided with a unloading valve for opening and closing the unloading of BPA.

The pressure holding unit may include a first supply unit having a first pressure control valve installed in a first supply line for supplying nitrogen gas from the nitrogen gas supply unit to the bucket conveyor.

The pressure holding unit may include a second supply unit having a second pressure control valve installed in a second supply line for supplying nitrogen gas from the nitrogen gas supply unit to the distribution conveyor.

The pressure holding unit is provided with a first control valve in a third supply line for supplying nitrogen gas from the nitrogen gas supply unit to the storage tank, and a second control valve is installed in a discharge line for discharging gas from the storage tank to the outside. And a third supply part provided with a pressure control part for measuring the pressure of the storage tank and controlling the first and second control valves, respectively.

The storage tank is characterized in that the dust collector is installed on the side to which the discharge line is connected.

According to the BPA handling system according to the present invention, handling for distributing BPA having granular matter and having explosive properties to the demand destination can be made efficiently and safely.

1 is a block diagram showing a BPA handling system according to the present invention,
2 is a plan view illustrating a bucket of the BPA handling system according to the present invention;
3 is a side view showing a bucket of the BPA handling system according to the present invention,
Figure 4 is a block diagram showing a distribution conveyor according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, the following examples may be modified in various other forms, the scope of the present invention Is not limited to the following examples.

1 is a block diagram showing a BPA handling system according to the present invention.

As shown in FIG. 1, the BPA handling system 100 according to the present invention is a system for handling so that BPA (Bisphenol-A) made of granular materials can be supplied to a customer, etc., which is supplied from a ruffle tower 10. BPA passed through the particle size selector 110 for selecting the size of the BPA, the pressure loss blocking unit 120 and the pressure loss blocking unit 120 installed in the line 123 from which the BPA is transferred from the particle size selector 110. The bucket conveyor 130 for vertically raising, the distribution conveyor 140 for conveying the BPA conveyed from the bucket conveyor 130 in the horizontal direction, and the BPA discharged through the distribution conveyor 140 is supplied from the upper storage The tank 150 may include a pressure holding unit 160 for supplying a pressure maintaining purge gas to the movement path of the BPA.

On the other hand, the frill tower 10 is filled with the BPA of the solid particles such as granules, and supplies the BPA to the collection unit 20 through the transfer screw 12 rotates by the drive of the motor 11 at the bottom. . The collection unit 20 collects the BPA supplied through the transfer screw 12 and supplies the BPA to the particle size selector 110 through the supply line 21 by opening the valve 22.

Particle size selector 110 is a mesh (Mesh) is formed to be inclined to form the through-holes of a predetermined size to select the particle size of the BPA so that the BPA is caught by the particles below the predetermined size when passing through the mesh, if necessary The driving force of the motor may be configured to apply vibration to the mesh or to make the mesh move.

The pressure loss blocking unit 120 is installed to maintain the airtight path of the BPA is transferred from the bucket conveyor 130 to the storage tank 150, the BPA is installed in the line, that is, the transfer line 123, While allowing the passage of the BPA to block the pressure loss to the particle size selector (110) side. Here, the transfer line 123 is provided with a valve 124 for opening and closing. In addition, the pressure loss blocking unit 120 is installed inside the rotor 122 having a plurality of blades for conveying the BPA, for example, to rotate by the drive of the rotary motor 121, the rotor 122 is The blades alternately block the inside while allowing the BPA to be transported by the blade during rotation, so that the gas inside is not easily discharged to the outside.

Bucket conveyor 130 is a pressure loss blocking unit 120 in consideration of the height of the storage tank 150 and the storage tank 150 is installed on the ground for supply to the transfer means (31, 32, 33). The BPA is passed vertically, for example, the chain 133 is installed on both sides of the main body 131 by the drive motor 132 to the endless track movement, a plurality of buckets ( 134 is fixed. Here, the main body 131 may be connected to the horizontal portion 131b which is horizontally formed at the bottom and the top of the vertical portion 131a which are vertically formed so that the BPA is easily supplied and stably supplied to the distribution conveyor 140. have.

In addition, the bucket 134 is to improve the transfer efficiency of the BPA, as well as for stable operation, as shown in Figures 2 and 3, the link member 135 is fixed to each side horizontally hinged to each other As a result, the hinge connector 135a is provided to be connected in line with the other buckets 134. Here, the hinge connecting portion 135a may be guided by a guide member or the like in the main body 131 when the bucket 134 moves by having a roller shape. In addition, the bucket 134 may be provided with fixing parts 134a for connecting to the chain 133 on both sides, and an opening 134b for inputting BPA is formed at the top of the bucket 134, and A guide part 134c may be formed to be inclined toward the opening 134b of the bucket 134 adjacent to one side, and guide the injection of the opening 134b of the BPA, and the bucket 1340 of a part of the bucket 134 may be formed. A scraper 134d for scraping BPA at the top may be formed vertically.

As shown in FIG. 4, the distribution conveyor 140 transports the BPAs transferred from the bucket conveyor 130 in a horizontal direction. For this purpose, for example, both sides of the main body 141 horizontally installed are driven motors 142. Belt 143 is installed to the endless track movement by a), the transfer plate 144 for transporting the BPA to the belt 143 is fixed to a plurality of vertically spaced apart, stored in the lower portion of the main body 141 A plurality of outlets 145 connected to each of the tanks 150 are provided at intervals along the longitudinal direction. At this time, the transfer plate 144 is fixed to the belt 143 by a fixing part (not shown) provided on the opposite side of the advancing direction, the lower end of the fixing belt 143 during the endless orbital movement of the fixing belt 143 When located, the BPA is transferred to the outlet 145. Here, the main body 141 is provided with an inlet 146 for injecting BPA from the bucket conveyor 130 is directed upward. In addition, the drive motor 142 transmits power through the drive belt 142a to the drive shaft 142b to which the belt 143 is connected, thereby allowing the belt 143 to make an endless track movement.

Outlet 145 is installed in plurality at intervals along the longitudinal direction of the main body 141, in order for the BPA to be introduced into all the outlet 145, the hole diameter of each of the outlet 145 for passing the BPA different from each other Alternatively, the hole position may be different, and alternatively, an opening timing of the discharge valve 147 installed at the outlet 145 or having a space under the outlet 145 may be adjusted, and various methods may be used. have.

Storage tank 150 may be made of a plurality, in this case the BPA discharged through the distribution conveyor 140 is supplied from the top, respectively, the conveying means (31, 32, 33), for example, the container through the unloading line 151 (31), the tank lorry (32), the backing area (Bagging area) 33, the BPA is unloaded. Here, the unloading line 151 may be provided in plurality for each storage tank 150, and the unloading valve 152 for opening and closing the unloading of the BPA is installed.

The pressure holding unit 160 supplies the pressure holding purge gas to the path of movement of the BPA which is formed to maintain the airtightness from the pressure loss blocking unit 120 to the storage tank 150 to facilitate the transfer of the BPA. Prevent BPA explosion.

The pressure holding unit 160 is, for example, a first supply unit 161 for supplying nitrogen gas to the bucket conveyor 130 as a purge gas, a second supply unit 162 for supplying the distribution conveyor 140, and a storage tank. It may include any one or all of the third supply unit 163 to supply to (150).

The first supply unit 161 may be provided with a first pressure control valve 161b in the first supply line 161a for supplying nitrogen gas as a purge gas from the nitrogen gas supply unit 170 to the bucket conveyor 130. Therefore, the first pressure control valve 161b repeats opening and closing of the first supply line 161a according to the set pressure so that nitrogen gas is supplied to the bucket conveyor 130 so that the bucket conveyor 130 maintains the desired pressure. do. Meanwhile, the first supply part 161 may be installed at both ends thereof in consideration of the length of the bucket conveyor 130.

The second supply unit 162 may be provided with a second pressure control valve 162b in the second supply line 162a for supplying nitrogen gas from the nitrogen gas supply unit 170 to the distribution conveyor 140. Therefore, the second pressure control valve 162b repeats the opening and closing of the second supply line 162a according to the set pressure so that the nitrogen gas is supplied to the distribution conveyor 140 so that the distribution conveyor 140 maintains the desired pressure. do.

The third supply unit 163 is provided with a first control valve 163b in a third supply line 163a for supplying nitrogen gas to the storage tank 150 from the nitrogen gas supply unit 170, and from the storage tank 150. The second control valve 163d is installed in the discharge line 163c for discharging gas to the outside, and the pressure for controlling the first and second control valves 163b and 163d by measuring the pressure of the storage tank 150, respectively. The controller 163e may be provided. Here, the pressure control unit 163e may include a pressure sensor for measuring the pressure inside the storage tank 150 or inside the third supply line 163a to control the pressure of the storage tank 150. Accordingly, the pressure control unit 163e controls the first and second control valves 163b and 163d in accordance with the internal pressure of the storage tank 150 or the internal pressure of the third supply line 163a to the storage tank 150, respectively. The internal pressure of the storage tank 150 is controlled by controlling the nitrogen gas supply and the gas discharge from the storage tank 150.

The storage tank 150 may be provided with a dust collector 153 for collecting and collecting particles from the gas discharged to the side connected to the discharge line (163c).

The operation of the BPA handling system according to the present invention will be described.

BPA consisting of granules such as granules from the prill tower 10 is selected through the particle size selector 110, the particle size is supplied to the pressure loss blocking unit 120. The pressure loss blocking unit 120 supplies the BPA to the bucket conveyor 130 while minimizing the loss of pressure, and the bucket conveyor 130 transfers the BPA to the upper side of the storage tank 150 to the distribution conveyor 140. do.

Distributing the BPA supplied to the distribution conveyor 140 in each of the storage tanks 150, and unloading the BPA from the storage tank 150 to the various transport means (31, 32, 33) through the unloading line 151 Done.

The pressure holding unit 160 supplies nitrogen to the transport path of the BPA, for example, the bucket conveyor 130, the distribution conveyor 140, and the storage tank 150, which maintains airtightness, to maintain the pressure in the transport path of the BPA. As a result, the BPA is smoothly transported and the BPA is prevented from being exploded.

As described above, the present invention has been described with reference to the accompanying drawings, but various modifications and changes can be made without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the following claims.

10: frill tower 11: motor
12: transfer screw 20: collecting unit
21: supply line 22: valve
31,32,33: conveying means 110: particle size sorter
120: pressure loss cutoff 121: rotating motor
122: rotating body 123: transfer line
124: valve 130: bucket conveyor
131: main body 132: drive motor
133: chain 134: bucket
134a: fixing portion 134b: opening
134c: guide part 134d: scraper
135: link member 135a: hinge connection
136: pressure gauge 140: distribution conveyor
141: main body 142: drive motor
142a: driving belt 142b: driving shaft
143: belt 144: transfer plate
145: outlet 146: inlet
150: storage tank 151: unloading line
152: loading valve 153: dust collector
160: pressure holding unit 161: first supply unit
161a: first supply line 161b: first pressure control valve
162: second supply unit 162a: second supply line
162b: second pressure control valve 163: third supply part
163a: third supply line 163b: first control valve
163c: discharge line 163d: second control valve
163e: pressure control unit 170: nitrogen supply unit

Claims (12)

In the system for handling the BPA made of granular material,
A particle size sorter for screening the size of the BPA supplied from the frill tower;
A pressure loss blocking unit installed in a line through which the BPA is transferred from the particle size selector and blocking the pressure loss toward the particle size selector while allowing the BPA to pass therethrough;
A bucket conveyor for vertically raising the BPA passing through the pressure loss blocking unit;
A distribution conveyor for transporting the BPA transferred from the bucket conveyor in a horizontal direction;
A storage tank supplied with the BPA discharged through the distribution conveyor from an upper portion, and unloading the BPA to a transport means through a loading line; And
Pressure holding unit for supplying a pressure holding purge gas to the path of movement of the BPA is formed to maintain the airtight from the pressure loss blocking portion to the storage tank from the outside
BPA handling system comprising a.
The method of claim 1, wherein the pressure loss blocking unit,
BPA handling system, characterized in that the rotating body having a plurality of blades for conveying the BPA is installed on the inside to rotate by the drive of the rotary motor, the blade alternately blocks the inside when the rotating body rotates.
The method of claim 1, wherein the bucket conveyor,
The chain is installed so that both sides of the main body are in orbital motion by the drive motor,
A plurality of buckets are fixed to the chain,
The bucket members are connected to each other by hinged coupling of link members fixed to both sides of the buckets horizontally,
The opening of the BPA is formed in the upper portion of the bucket, and the BPA handling system is formed to be inclined toward the opening of the bucket adjacent to one side of the opening is formed guide portion for guiding the opening of the BPA handling system .
The method of claim 3, wherein the main body,
BPA handling system, characterized in that the horizontal portion is formed horizontally connected to the bottom and the top of the vertical portion is formed vertically.
The method of claim 3, wherein the bucket conveyor,
BPA handling system, characterized in that the scraper is formed vertically on top of the bucket of some of the bucket.
The method of claim 1, wherein the distribution conveyor,
Belts are installed so that both sides of the main body move in endless tracks by a drive motor,
The transfer plate for transferring the BPA to the belt is fixed to a plurality of vertically spaced intervals,
BPA handling system, characterized in that provided in the lower portion of the main body is provided with a plurality of outlets connected to each of the storage tanks at intervals along the longitudinal direction.
The method of claim 6, wherein the distribution conveyor,
BPA handling system, characterized in that the discharge valve is installed in the outlet.
The method of claim 1, wherein the storage tank,
BPA handling system, characterized in that a plurality of unloading line is provided with a unloading valve for opening and closing the unloading of the BPA.
According to claim 1, wherein the pressure holding unit,
And a first supply part provided with a first pressure control valve in a first supply line for supplying nitrogen gas from the nitrogen gas supply part to the bucket conveyor.
The pressure holding unit according to claim 1 or 9,
And a second supply part provided with a second pressure control valve in a second supply line for supplying nitrogen gas from the nitrogen gas supply part to the distribution conveyor.
The pressure holding unit according to claim 1 or 9,
The first control valve is installed in the third supply line for supplying nitrogen gas from the nitrogen gas supply unit to the storage tank, the second control valve is installed in the discharge line for discharging the gas from the storage tank to the outside, the storage tank BPA handling system comprising a third supply unit is provided with a pressure control unit for measuring the pressure of the first and second control valves respectively.
The method of claim 11, wherein the storage tank,
BPA handling system, characterized in that the dust collector is installed on the side connected to the discharge line.
KR1020100124816A 2010-12-08 2010-12-08 System for handling bisphenol-a KR101220962B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100124816A KR101220962B1 (en) 2010-12-08 2010-12-08 System for handling bisphenol-a

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Application Number Priority Date Filing Date Title
KR1020100124816A KR101220962B1 (en) 2010-12-08 2010-12-08 System for handling bisphenol-a

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KR20120063719A true KR20120063719A (en) 2012-06-18
KR101220962B1 KR101220962B1 (en) 2013-01-23

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101497013B1 (en) * 2014-09-11 2015-03-06 (주)그린니스 Apparatus for manufacturing cover soil material using sewage sludge
CN105151832A (en) * 2015-06-29 2015-12-16 朱庭家 Pottery clay storing and loose-packing system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001171838A (en) * 1999-12-21 2001-06-26 Sanwa Sangyo Kk Air-tight conveyor
KR20020043928A (en) * 2000-12-05 2002-06-12 윤영달 Sizing Apparatus
JP4492149B2 (en) * 2004-02-19 2010-06-30 三菱化学株式会社 Bucket conveyor system
KR100921660B1 (en) * 2007-11-28 2009-10-16 한국콘베어공업주식회사 Airtight conveyor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101497013B1 (en) * 2014-09-11 2015-03-06 (주)그린니스 Apparatus for manufacturing cover soil material using sewage sludge
CN105151832A (en) * 2015-06-29 2015-12-16 朱庭家 Pottery clay storing and loose-packing system

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