KR100460577B1 - A free control contract apparatus of conveyer for construction waste - Google Patents

A free control contract apparatus of conveyer for construction waste Download PDF

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Publication number
KR100460577B1
KR100460577B1 KR1020040061813A KR20040061813A KR100460577B1 KR 100460577 B1 KR100460577 B1 KR 100460577B1 KR 1020040061813 A KR1020040061813 A KR 1020040061813A KR 20040061813 A KR20040061813 A KR 20040061813A KR 100460577 B1 KR100460577 B1 KR 100460577B1
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KR
South Korea
Prior art keywords
fastening
conveyor belt
plate
fastener
deflection
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KR1020040061813A
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Korean (ko)
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KR20040076240A (en
Inventor
김길평
성수복
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(주)씨에스티개발
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Priority to KR1020040061813A priority Critical patent/KR100460577B1/en
Publication of KR20040076240A publication Critical patent/KR20040076240A/en
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Publication of KR100460577B1 publication Critical patent/KR100460577B1/en

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Classifications

    • 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
    • B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
    • B65G43/02—Control devices, e.g. for safety, warning or fault-correcting detecting dangerous physical condition of load carriers, e.g. for interrupting the drive in the event of overheating
    • 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
    • B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
    • B65G15/22—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration comprising a series of co-operating units
    • B65G15/26—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration comprising a series of co-operating units extensible, e.g. telescopic
    • 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
    • B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
    • B65G15/60—Arrangements for supporting or guiding belts, e.g. by fluid jets
    • 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
    • B65G17/26—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 co-operating units, e.g. interconnected by pivots
    • B65G17/28—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 co-operating units, e.g. interconnected by pivots extensible, e.g. telescopic
    • 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
    • B65G21/00—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors
    • B65G21/20—Means incorporated in, or attached to, framework or housings for guiding load-carriers, traction elements or loads supported on moving surfaces
    • B65G21/2045—Mechanical means for guiding or retaining the load on the load-carrying surface
    • B65G21/2063—Mechanical means for guiding or retaining the load on the load-carrying surface comprising elements not movable in the direction of load-transport
    • 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
    • B65G2201/06—Articles and bulk

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structure Of Belt Conveyors (AREA)

Abstract

PURPOSE: A free control connecting unit of a conveyor belt for construction waste transfer is provided to improve productivity by adjusting the lowering of a belt using a spring and securing the smooth flow of processes. CONSTITUTION: A free control connecting unit of a conveyor belt is installed between a moving rail frame and a rear fixing unit on the side of lower rollers of a conveyor belt(400). The free control connecting unit is formed by combining a front connecting unit and a rear connecting unit. The lowering of the conveyor belt is corrected by a high tension spring of the free control connecting unit.

Description

건설폐기물용 컨베이어 벨트의 자유조절 체결대{A FREE CONTROL CONTRACT APPARATUS OF CONVEYER FOR CONSTRUCTION WASTE}Free control fastening of conveyor belt for construction wastes {A FREE CONTROL CONTRACT APPARATUS OF CONVEYER FOR CONSTRUCTION WASTE}

본 발명은 건설폐기물용 컨베이어 벨트의 자유조절 체결대에 관한 것으로서, 건설폐기물의 골재의 이동시설로 사용되는 컨베이어 시설의 작업중 발생되는 벨트의 처짐을 처짐보정대 내부에 구성된 자유조절 체결대에 자연스럽게 보정될 수 있도록 하여 작업중 벨트의 처짐으로 작업을 중단하는 현상을 미연에 방지할 수 있도록 하는 건설폐기물용 컨베이어 벨트의 자유조절 체결대에 관한 것이다.The present invention relates to a freely adjustable fastening of the conveyor belt for construction waste, and naturally to the deflection of the belt generated during the operation of the conveyor facility used as a moving facility of the aggregate of construction waste to the freely adjustable fastening configured inside the deflection correction system. The present invention relates to a freely adjustable fastener of a conveyor belt for construction wastes, which prevents the phenomenon of stopping work due to sagging of the belt during operation.

일반적으로 건설폐기물 처리공정에 사용되는 컨베이어 시설은 도 1과 같이 받침대(10), 회전모터(20), 회전롤러(30), 컨베이어 벨트(40)로 구성되고, 컨베이어 벨트(40)의 경사면의 하단측으로는 처짐보정대(50)가 설치되는 방식으로 구성된다.In general, the conveyor facility used in the construction waste treatment process is composed of a pedestal 10, a rotating motor 20, a rotating roller 30, a conveyor belt 40, as shown in Figure 1 of the inclined surface of the conveyor belt 40 The lower side is configured in such a way that the deflection correction table 50 is installed.

그러나 기존의 처짐보정대(50)는, 컨베이어 벨트(40)의 보정을 길이조절용 볼트(51)를 회전시켜 이동레일틀(52)을 후면으로 이동할 수 있도록 도 2에서 보는 봐와 같이 구성되어 있어, 컨베이어 벨트(40)의 처짐으로 인한 보정이 필요할 경우에는 작업공정을 전면 중단하고 길이조절용 볼트(51)를 회전시켜야 하는 문제점이 발생되어 생산량 차질의 우려가 나타나고 있는 실정이다.However, the existing deflection correction table 50 is configured as shown in FIG. 2 so that the moving rail 52 can be moved to the rear side by rotating the length adjusting bolt 51 to correct the conveyor belt 40. When the correction is required due to the sag of the conveyor belt 40, the work process is stopped and the length adjusting bolt 51 is rotated.

본 발명은 상술한 문제점을 감안하여, 본 발명은, 건설폐기물의 공정에 필수적으로 사용되는 컨베이어 벨트를 장시간 사용하여도 벨트의 처짐을 처짐보정대의 자유조절 체결대에서 스스로 고강력 스프링에 의해 조정할 수 있도록 하여 작업공정의 원활한 흐름을 확보하여 생산성을 향상시킬 수 있도록 하는 것을 그 목적으로 한다.The present invention in view of the above problems, the present invention can adjust the deflection of the belt by the high-strength spring by itself in the free adjustment fastening of the deflection correction even if the conveyor belt used for the construction waste is used for a long time. The purpose is to ensure a smooth flow of the work process to improve productivity.

도 1은 종래의 컨베이어 시설의 설치상태를 나타내는 개념도.1 is a conceptual diagram showing an installation state of a conventional conveyor facility.

도 2는 도 1의 "A"를 확대한 상태를 나타내는 도면.2 is a view showing an enlarged state "A" in FIG.

도 3은 본 발명의 컨베이어 벨트의 자유조절 체결대를 설치한 상태를 나타내는 개념도.Figure 3 is a conceptual diagram showing a state in which the free adjustment fastening of the conveyor belt of the present invention is installed.

도 4는 도 3의 "A"를 확대한 상태를 나타내는 도면.4 is a view showing an enlarged state "A" in FIG.

도 5는 본 발명의 컨베이어 벨트의 자유조절 체결대의 제작상태를 나타내는 도면.5 is a view showing a manufacturing state of the free adjustment fastening of the conveyor belt of the present invention.

< 도면의 주요부분에 대한 부호의 설명 ><Description of Symbols for Major Parts of Drawings>

100: 받침대 200: 회전모터100: pedestal 200: rotary motor

300: 회전롤러 400: 컨베이어 벨트300: rotating roller 400: conveyor belt

500: 처짐보정대 510: 이동레일틀500: deflection correction 510: moving rail

520: 후면 고정대 530: 자유조절 체결대520: rear fastener 530: freely adjustable fastener

540: 전면체결대 541: 갈고리540: Fastener 541: Hook

542,542': 플레이트 543: 고강력 스프링542,542 ': Plate 543: High force spring

544: 체결볼트 550: 후면체결대544: fastening bolt 550: rear fastening

551: 볼트부551: bolt portion

본 발명은 상술한 목적달성을 위해, 본 발명은, 건설폐기물의 처리공정에 사용되는 컨베이어 벨트의 처짐을 자연스럽게 보정할 수 있도록 처짐보정대에 설치되는 자유조절 체결대에 있어서, 상기 자유조절 체결대는, 컨베이어 벨트 하단 롤러측면의 이동레일틀과 후면 고정대 사이에 설치되어 전면체결대와 후면체결대가 결합되는 구조로 자유조절 체결대를 형성시켜 컨베이어 벨트의 회전시 발생되는 처짐을 컨베이어 벨트 하단 롤러측면의 이동레일틀과 후면 고정대 사이에 설치된 자유조절 체결대의 고강력 스프링에 의해 자연스럽게 보정하도록 구성하고, 상기 전면체결대는, 한측으로 갈고리를 부착된 플레이트가 제작되고, 타측으로는 홈과 체결홀이 형성된 플레이트를 형성시켜, 중앙부에는 고강력 스프링을 설치하여 양측으로 갈고리가 부착된 플레이트와 홈과 체결홀이 형성된 플레이트를 용접고정하고, 상기 후면체결대는, 한측으로 홈과 체결홀이 형성된 플레이트로 형성되고 타측으로는 볼트부가 형성된 플레이트가 형성되어, 중앙부에 고강력 스프링을 설치하여 양측으로 플레이트를 용접고정하며, 상기 전면체결대와 후면체결대는 체결볼트로 체결 고정시켜 상기 이동레일틀과 후면고정대 사이에 설치하여 컨베이어 벨트의 작업중 발생되는 처짐을 고강력 스프링에 의해 보정할 수 있도록 구성되는 것을 특징으로 하는 건설폐기물용 컨베이어 벨트의 자유조절 체결대를 제공한다.The present invention, in order to achieve the above object, the present invention, in the free adjustment fastener is installed on the deflection correction table to naturally compensate for the deflection of the conveyor belt used in the construction process of the waste, the free control fastening is It is installed between the moving rail frame and the rear fixing stand on the lower roller side of the conveyor belt to form a freely adjustable fastening stand that combines the front fastening stand and the rear fastening stand so that the deflection generated during the rotation of the conveyor belt is It is configured to be naturally compensated by the high-force spring of the free adjustment fastening rod installed between the moving rail and the rear fastening, the front fastening plate is made of a plate attached to the hook on one side, the other side of the plate formed with grooves and fastening holes Forming a high-strength spring is installed in the center of the hook is attached to both sides Weld and fix the plate and the plate formed with the groove and the fastening hole, the rear fastening plate is formed of a plate formed with the groove and the fastening hole on one side and a plate formed with the bolt portion on the other side, the high-strength spring is installed The plate is welded to both sides, and the front fastening and rear fastening are fastened and fastened by fastening bolts to be installed between the moving rail and the rear fastening so that deflections generated during the operation of the conveyor belt can be corrected by high-strength springs. It provides a freely adjustable fastening of the conveyor belt for construction wastes, characterized in that the configuration.

이하, 첨부 도면을 참조하여 본 발명의 구성을 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention is demonstrated with reference to an accompanying drawing.

도 3은 본 발명의 컨베이어 벨트의 자유조절 체결대를 설치한 상태를 나타내는 개념도이고, 도 4는 도 3의 "A"를 확대한 상태를 나타내는 도면이다.3 is a conceptual view showing a state in which the free adjustment fastening of the conveyor belt of the present invention is installed, Figure 4 is a view showing an enlarged state "A" of FIG.

건설폐기물의 골재 및 이물질의 운반을 위해 설치되는 컨베이어 시설은, 받침대(100), 회전모터(200), 회전롤러(300), 컨베이어 벨트(400)로 구성되고, 컨베이어 벨트(400)의 경사면의 하단측으로는 처짐보정대(500)가 설치되며, 상기 처짐보정대(500)의 내부에는 자유조절 체결대(530)가 설치되고,Conveyor facilities are installed for the transport of aggregates and foreign matter of construction waste, is composed of a pedestal 100, a rotating motor 200, a rotating roller 300, a conveyor belt 400, the slope of the conveyor belt 400 The deflection compensation table 500 is installed at the lower side, and the free adjustment fastening table 530 is installed inside the deflection compensation table 500,

건설폐기물의 처리공정에 사용되는 컨베이어 벨트의 처짐을 자연스럽게 보정할 수 있도록 처짐보정대(500)에 설치되는 자유조절 체결대(530)는, 컨베이어 벨트(400) 하단 롤러측면의 이동레일틀(510)과 후면 고정대(520) 사이에 설치되어 전면체결대(540)와 후면체결대(550)가 결합되는 구조로 자유조절 체결대(530)를 형성시켜 컨베이어 벨트(400)의 회전시 발생되는 처짐을 컨베이어 벨트(400) 하단 롤러측면의 이동레일틀(510)과 후면 고정대(520) 사이에 설치된 자유조절 체결대(530)의 고강력 스프링(543)에 의해 자연스럽게 보정하도록 구성한다.The freely adjustable fastening table 530 installed on the deflection correction table 500 to naturally compensate the deflection of the conveyor belt used in the construction waste treatment process is a movable rail 510 of the roller side of the lower end of the conveyor belt 400. Installed between the rear fastener 520 and the front fastener 540 and the rear fastener 550 to form a freely adjustable fastener 530 so that the deflection occurs when the conveyor belt 400 is rotated. It is configured to naturally correct by the high force spring 543 of the freely adjustable fastener 530 installed between the moving rail frame 510 and the rear fixing 520 on the lower roller side of the conveyor belt 400.

도 5는 본 발명의 컨베이어 벨트의 자유조절 체결대의 제작상태를 나타내는 도면으로서, 자유조절 체결대(530)는, 전면체결대(540)와 후면체결대(550)로 구성되며,5 is a view showing the manufacturing state of the free adjustment fastening of the conveyor belt of the present invention, the free control fastening 530 is composed of the front fastening 540 and the rear fastening 550,

상기 전면체결대(540)는, 한측으로 갈고리(541)를 부착된 플레이트(542')가 제작되고, 타측으로는 홈과 체결홀이 형성된 플레이트(542)를 형성시켜, 중앙부에는 고강력 스프링(543)을 설치하여 양측으로 갈고리(541)가 부착된 플레이트(542')와 홈과 체결홀이 형성된 플레이트(542)를 용접고정하고,The front fastening table 540 is a plate 542 'with a hook 541 on one side is made, the other side is formed with a plate 542 formed with a groove and a fastening hole, the high portion of the spring ( 543) to fix the plate 542 'with the hooks 541 on both sides and the plate 542 with the grooves and the fastening holes to be welded thereto.

상기 후면체결대(550)는, 한측으로 홈과 체결홀이 형성된 플레이트(542)로형성되고 타측으로는 볼트부(551)가 형성된 플레이트(542')가 형성되어, 중앙부에 고강력 스프링(543)을 설치하여 양측으로 플레이트(542,542')를 용접고정하며, 상기 전면체결대(540)와 후면체결대(550)는 체결볼트(544)로 체결 고정시켜 상기 이동레일틀(510)과 후면고정대(520) 사이에 설치하여 컨베이어 벨트(400)의 작업중 발생되는 처짐을 고강력 스프링(543)에 의해 보정할 수 있도록 구성된다.The rear fastening stand 550 is formed of a plate 542 formed with a groove and a fastening hole on one side and a plate 542 'formed with a bolt 551 on the other side, and has a high force spring 543 at the center thereof. Install and fix the plates 542 and 542 'to both sides, and the front fastening table 540 and the rear fastening table 550 are fastened and fastened with fastening bolts 544 to the movable rail 510 and the rear fastening table. Installed between the 520 is configured to be able to correct the deflection generated during the operation of the conveyor belt 400 by the high-strength spring 543.

상술한 구성에서 알 수 있는 바와 같이, 상기 건설폐기물용 컨베이어 벨트의 자유조절 체결대는, 컨베이어 벨트의 작업중 처짐을 고강력 스프링에 의해 스스로 조절할 수 있도록 구성하여 컨베이어 벨트의 처짐으로 인한 작업중단을 미연에 방지할 수 있도록 구성한다.As can be seen from the above configuration, the freely adjustable fastening of the conveyor belt for construction wastes is configured to adjust the deflection during operation of the conveyor belt by means of a high-strength spring, thus preventing work interruption due to deflection of the conveyor belt. Configure to prevent.

상술한 본 발명의 구성에 의한 효과를 설명한다.The effect by the structure of this invention mentioned above is demonstrated.

본 발명의 건설폐기물용 컨베이어 벨트의 자유조절 체결대는, 건설폐기물 처리공정에 사용되는 컨베이어 벨트의 늘어짐으로 인한 문제점을 미연에 방지하여 작업의 효율성을 높혀 많은 물량의 재처리를 가능토록 하는 효과를 갖도록 한다.Free control fastening of the conveyor belt for construction waste of the present invention, to prevent the problems caused by the sagging of the conveyor belt used in the construction waste treatment process in advance to increase the efficiency of the work to have the effect of enabling a large amount of reprocessing. do.

Claims (1)

건설폐기물의 처리공정에 사용되는 컨베이어 벨트의 처짐을 자연스럽게 보정할 수 있도록 처짐보정대(500)에 설치되는 자유조절 체결대(530)에 있어서,In the free adjustment fastener 530 which is installed on the deflection correction table 500 to naturally correct the deflection of the conveyor belt used in the construction waste treatment process, 상기 자유조절 체결대(530)는, 컨베이어 벨트(400) 하단 롤러측면의 이동레일틀(510)과 후면 고정대(520) 사이에 설치되어 전면체결대(540)와 후면체결대(550)가 결합되는 구조로 자유조절 체결대(530)를 형성시켜 컨베이어 벨트(400)의 회전시 발생되는 처짐을 컨베이어 벨트(400) 하단 롤러측면의 이동레일틀(510)과 후면 고정대(520) 사이에 설치된 자유조절 체결대(530)의 고강력 스프링(543)에 의해 자연스럽게 보정하도록 구성하고,The freely adjustable fastener 530 is installed between the moving rail frame 510 and the rear fastener 520 of the lower roller side of the conveyor belt 400 so that the front fastener 540 and the rear fastener 550 are coupled to each other. The free adjustment fastener 530 is formed in such a structure that the deflection generated during the rotation of the conveyor belt 400 is freely installed between the moving rail 510 and the rear fixing member 520 of the lower roller side of the conveyor belt 400. It is configured to naturally correct by the high force spring 543 of the adjustment fastening 530, 상기 전면체결대(540)는, 한측으로 갈고리(541)를 부착된 플레이트(542')가 제작되고, 타측으로는 홈과 체결홀이 형성된 플레이트(542)를 형성시켜, 중앙부에는 고강력 스프링(543)을 설치하여 양측으로 갈고리(541)가 부착된 플레이트(542')와 홈과 체결홀이 형성된 플레이트(542)를 용접고정하고,The front fastening table 540 is a plate 542 'with a hook 541 on one side is made, the other side is formed with a plate 542 formed with a groove and a fastening hole, the high portion of the spring ( 543) to fix the plate 542 'with the hooks 541 on both sides and the plate 542 with the grooves and the fastening holes to be welded thereto. 상기 후면체결대(550)는, 한측으로 홈과 체결홀이 형성된 플레이트(542)로 형성되고 타측으로는 볼트부(551)가 형성된 플레이트(542')가 형성되어, 중앙부에 고강력 스프링(543)을 설치하여 양측으로 플레이트(542,542')를 용접고정하며, 상기 전면체결대(540)와 후면체결대(550)는 체결볼트(544)로 체결 고정시켜 상기 이동레일틀(510)과 후면고정대(520) 사이에 설치하여 컨베이어 벨트(400)의 작업중 발생되는 처짐을 고강력 스프링(543)에 의해 보정할 수 있도록 구성되는 것을 특징으로 하는 건설폐기물용 컨베이어 벨트의 자유조절 체결대.The rear fastening stand 550 is formed of a plate 542 formed with a groove and a fastening hole on one side and a plate 542 'formed with a bolt portion 551 on the other side, and has a high force spring 543 at the center thereof. Install and fix the plates 542 and 542 'to both sides, and the front fastening table 540 and the rear fastening table 550 are fastened and fastened with fastening bolts 544 to the movable rail 510 and the rear fastening table. The free adjustment fastening of the conveyor belt for construction wastes, characterized in that configured to be installed between the (520) to correct the deflection generated during the operation of the conveyor belt 400 by the high-strength spring (543).
KR1020040061813A 2004-08-05 2004-08-05 A free control contract apparatus of conveyer for construction waste KR100460577B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101919592B1 (en) * 2017-10-11 2019-02-08 (주)미래지반연구소 Apparatus for spreading of ground stiffener
KR101962926B1 (en) * 2018-06-04 2019-03-28 (주)미래지반연구소 The construction method for spreading of ground stiffener

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101919592B1 (en) * 2017-10-11 2019-02-08 (주)미래지반연구소 Apparatus for spreading of ground stiffener
KR101962926B1 (en) * 2018-06-04 2019-03-28 (주)미래지반연구소 The construction method for spreading of ground stiffener

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