CN109484801B - Belt conveyor tensioning control system and control method suitable for multiple stations - Google Patents
Belt conveyor tensioning control system and control method suitable for multiple stations Download PDFInfo
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- CN109484801B CN109484801B CN201710809180.1A CN201710809180A CN109484801B CN 109484801 B CN109484801 B CN 109484801B CN 201710809180 A CN201710809180 A CN 201710809180A CN 109484801 B CN109484801 B CN 109484801B
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- 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
- B65G23/00—Driving gear for endless conveyors; Belt- or chain-tensioning arrangements
- B65G23/44—Belt or chain tensioning arrangements
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- 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
- B65G21/10—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors movable, or having interchangeable or relatively movable parts; Devices for moving framework or parts thereof
- B65G21/14—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors movable, or having interchangeable or relatively movable parts; Devices for moving framework or parts thereof to allow adjustment of length or configuration of load-carrier or traction element
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structure Of Belt Conveyors (AREA)
- Drives For Endless Conveyors (AREA)
Abstract
The invention provides a belt conveyor tensioning control system and a belt conveyor tensioning control method suitable for multiple stations. The invention comprises a movable head pulley and a belt arranged on the movable head pulley, wherein the movable head pulley is arranged on a movable trolley, the movable trolley is arranged on a trolley track, a first station chute and a second station chute are respectively arranged below the trolley track, a first station signal detector and a second station signal detector are respectively arranged above the first station chute and the second station chute, which correspond to each other, a heavy wheel is arranged on the belt, the heavy wheel is connected with a tensioning driving oil cylinder through a tensioning steel wire rope, and a telescopic finishing device is arranged on the tensioning steel wire rope. The invention can effectively solve the problem that the movement of the head pulley is not synchronous with the extension of the belt tensioning driving oil cylinder, and solves the problems that the tensioning steel wire rope of the belt conveyor is not loose and does not slot in any state.
Description
The technical field is as follows:
the invention relates to a belt conveyor tensioning control system and method suitable for multiple stations, and belongs to the technical field of mechanical equipment.
Background art:
the belt conveyor can be realized by adopting a method of driving a head wheel of a machine head to move through a movable trolley in order to meet the requirements of different conveying processes, and the requirements of different conveying processes are met by the machine head being positioned at different stations. In the prior art, the movement of a machine head and the stretching of a hydraulic tensioning oil cylinder are difficult to synchronize, the moving trolley is easy to move with a load, the moving trolley is difficult to move, the tensioning steel wire ropes are wound and even separated from a groove due to the fact that the tension of the tensioning device is excessively released in the moving process of the moving trolley, and when the tensioning trolley is tensioned again, the steel wire ropes are extruded and deformed, and even the tensioning device is damaged. Chinese patent CN204124743U entitled control system of hydraulic tensioning device of belt conveyor, which provides a control system of a hydraulic tensioning device to realize constant control of belt tensioning force in the lifting process of a belt material tail vehicle, and Chinese patent CN204675251U entitled hydraulic tensioning system of belt conveyor and belt conveyor, which solves the problem of greatly reducing track resistance when a tensioning roller is adjusted, thereby accurately adjusting the tensioning roller; chinese patent CN205708514U entitled tension adjusting device for belt conveyor, which adjusts the tension of the driving belt of the belt conveyor through a tension roller; the three patents do not solve the problem that the head wheel moves to the belt conveyor tensioning at different stations and the problem that the head wheel moves and the belt tensioning driving oil cylinder stretches and retracts asynchronously, and can not ensure that a steel wire rope for tensioning the belt conveyor is not loosened and does not drop out of a groove in any state.
In summary, a need exists for a belt tensioning control system and a control method suitable for multi-station, which solve the problem that the movement of a head pulley and the extension and retraction of a belt tensioning driving cylinder are not synchronous, and solve the problems that a belt tensioning steel wire rope is not slack and does not groove in any state, but no report is found about the technology at present.
Disclosure of Invention
The invention aims to provide a belt conveyor tensioning control system and a belt conveyor tensioning control method suitable for multiple stations, which can effectively solve the problem that the movement of a head pulley and the stretching of a belt tensioning driving oil cylinder are not synchronous, and solve the problems that a belt conveyor tensioning steel wire rope is not loose or does not groove in any state.
The above purpose is realized by the following technical scheme:
the utility model provides a belt feeder tensioning control system suitable for multistation, includes portable head pulley and installs portable head pulley on the belt, portable head pulley set up on the travelling car, the travelling car set up on the dolly track, dolly track below be provided with first station chute and second station chute respectively, first station chute with the top that the second station chute corresponds be provided with first station signal detector and second station signal detector respectively, the belt on be provided with the heavy wheel, the heavy wheel pass through tensioning wire rope and connect tensioning actuating cylinder, tensioning wire rope on be provided with flexible finishing device.
Belt feeder tensioning control system suitable for multistation, flexible finishing device including setting up the movable pulley in wire rope below, the both sides of movable pulley be provided with respectively and be used for compressing tightly wire rope's second fixed pulley and third fixed pulley, the movable pulley pass through balancing weight wire rope and connect the balancing weight, balancing weight wire rope support through fifth fixed pulley and fourth fixed pulley.
The belt feeder tensioning control system suitable for multistation, the belt on lie in the both sides of heavy wheel and be provided with first directive wheel and second directive wheel.
The belt feeder tensioning control system suitable for multistation, the side position of balancing weight be provided with high-order signal detector and low level signal detector.
A method of belt tensioning control for multiple stations, the method comprising:
when the movable head pulley of the belt feeder of multistation needs to remove to the second station chute from first station chute, first step: the tensioning driving oil cylinder extends out, the moving trolley keeps a static state, the tensioning force of the tensioning steel wire rope and the belt is continuously released at the moment, the heavy wheel rises, when the tension of the tensioning driving oil cylinder shows zero tension, the heavy wheel stops rising, the tensioning driving oil cylinder continues to extend forwards without stopping, and the released tensioning steel wire rope is pulled up by the driven pulley under the action of the balancing weight and keeps a low-pressure tensioning state without disengaging; the second step is that: the tensioning driving oil cylinder continuously extends out, and the balancing weight continuously descends; the third step: when the balancing weight descends to the low-level signal detector, the balancing weight triggers the low-level signal detector to send out a stop signal, and the tensioning driving oil cylinder stops extending and keeps still; the fourth step: the movable trolley drives the movable head wheel to move towards the chute direction of the second station, and at the moment, the balancing weight is pulled up under the action of the tensioning steel wire rope and the balancing weight steel wire rope. But the tensioning steel wire rope still keeps a low-pressure tensioning state and does not fall off the groove in the movement process; the fifth step: when the movable head wheel is driven by the movable trolley to reach the second station chute, the movable head wheel triggers the second station signal detector to send out a stop signal, and the movable trolley stops acting and is static and positioned; in the fifth step, the counterweight block rises while the moving trolley moves, and if the high-position signal detector detects a signal before the second station signal detector, the second step is repeated; and a sixth step: tensioning the belt to a set tension by the tensioning driving oil cylinder, and completing the starting preparation of the belt conveyor on the chute sheet at the second station;
when the movable head pulley of the belt feeder of multistation needs to remove to first station chute from the second station chute, first step: the tensioning driving oil cylinder extends out, the movable trolley keeps a static state, the tensioning force of the tensioning steel wire rope and the belt is continuously released at the moment, and the tensioning driving oil cylinder stops extending out and keeps static until the display tension of the tensioning driving oil cylinder is zero; the second step is that: the movable head pulley moves from the second station chute to the first station chute along with the movable trolley, and the released tensioning steel wire rope is pulled up by the driven pulley under the action of the balancing weight and keeps a low-pressure tensioning state without disengaging from the chute; the movable trolley continuously moves towards the chute direction of the first station, and the balancing weight continuously descends; the third step: when the movable head wheel is driven by the movable trolley to reach the first station chute, the movable head wheel triggers the first station signal detector to send out a stop signal, and the movable trolley stops acting and is static and positioned; the fourth step: tensioning driving cylinder strains the belt to the pulling force of settlement, and the balancing weight is pulled and is risen to the top, and the belt feeder starts at first station chute department and prepares to accomplish.
Has the advantages that:
the belt tensioning device is suitable for tensioning systems of various multi-station belt conveyors, is particularly suitable for tensioning the belt conveyors with head wheels moving to different stations, ensures the running reliability of the belt conveyor system through the extension control program of the head trolley moving and the tensioning driving oil cylinder, completely achieves the minimum traction force when the head wheels of the belt conveyor move, and solves the problem that the head wheel moving and the belt tensioning driving oil cylinder are not synchronous; meanwhile, the tensioning steel wire rope of the belt conveyor is ensured not to loosen and not to drop out of the groove in any state.
Drawings
Fig. 1 is a schematic diagram of a first station state of a belt conveyor and a tensioning mechanism thereof suitable for multiple stations.
Fig. 2 is a schematic drawing of a multi-station belt conveyor and a tensioning mechanism thereof in a state that a tensioning steel wire is pulled up and prevented from loosening.
Fig. 3 is a schematic diagram of a second station state of a belt conveyor and a tensioning mechanism thereof suitable for multiple stations.
In the figure: 1. a belt; 2. a movable head pulley; 3. moving the trolley; 4. a trolley track; 5. a first direction-changing wheel; 6. a second direction-changing wheel; 7. a heavy wheel; 8. a first fixed pulley; 9. a second fixed pulley; 10. a third fixed pulley; 11. a movable pulley; 12. a counterweight steel wire rope; 13. a fourth fixed pulley; 14. a fifth fixed pulley; 15. a balancing weight; 16. a high-order signal detector; 17. a low-order signal detector; 18. tensioning the steel wire rope; 19. tensioning the driving oil cylinder; 20. a first station signal detector; 21. a second station signal detector; 22. a first station chute; 23. a second station chute.
Detailed Description
The present invention will be further illustrated below with reference to specific embodiments, which are to be understood as merely illustrative and not limitative of the scope of the present invention.
As shown in fig. 1 to 3, the belt tensioning control system suitable for multiple stations of the embodiment includes a multiple station chute, a belt conveyor with a movable machine head, a belt tensioning mechanism and a telescopic finishing device for tensioning a steel wire rope;
the multi-station chutes comprise a first station chute 22 and a second station chute 23; the first station chute 22 and the second station chute 23 are respectively arranged below the belt conveyor head direction;
the belt conveyor with the movable machine head comprises a belt 1, a movable head wheel 2, a movable trolley 3, a trolley track 4, a first direction-changing wheel 5, a second direction-changing wheel 6, a heavy wheel 7, a first station signal detector 20 and a second station signal detector 21; the movable head wheel 2 is fixed on the movable trolley 3 and can move together with the movable trolley 3 on the trolley track 4 between the first station chute 22 and the second station chute 23. The first station signal detector 20 and the second station signal detector 21 can respectively detect the alignment signals of the movable head wheel 2 between the first station chute 22 and the second station chute 23;
the belt tensioning mechanism comprises a first fixed pulley 8, a tensioning steel wire rope 18 and a tensioning driving oil cylinder 19; after the tensioning steel wire rope 18 passes through the fixed pulley 8, one end of the tensioning steel wire rope is connected with a frame of a heavy wheel 7 of the belt conveyor, and the other end of the tensioning steel wire rope is connected with the end part of a piston rod of a tensioning driving oil cylinder; when the piston rod of the tension driving oil cylinder 19 makes telescopic motion, the tension of the belt 1 can be tightened and released by tensioning the steel wire rope 18 and the heavy wheel 7.
The telescopic finishing device for tensioning the steel wire rope comprises a second fixed pulley 9, a third fixed pulley 10, a movable pulley 11, a counterweight steel wire rope 12, a fourth fixed pulley 13, a fifth fixed pulley 14, a counterweight 15, a high-position signal detector 16 and a low-position signal detector 17; one end of the counterweight steel wire rope 12 passes through a fourth fixed pulley 13 and a fifth fixed pulley 14 respectively to be connected with the movable pulley 11, and the other end of the counterweight steel wire rope is connected with a counterweight 15; the movable pulley 11 is positioned between the second fixed pulley 9 and the third fixed pulley 10 and passes through a tensioning steel wire rope 18; when the tensioning steel wire rope 18 is loosened, the balancing weight 15 can keep small tension on the tensioning steel wire rope 18 through the balancing weight steel wire rope 12 and the movable pulley 11, so that the tensioning steel wire rope 18 is prevented from loosening and escaping from the groove; the high-order signal detector 16 and the low-order signal detector 17 are installed on the side surface of the balancing weight 15, and when the balancing weight 15 moves up and down, the high-order signal detector 16 and the low-order signal detector 17 can respectively complete the detection of the balancing weight 15 at the high position and the low position.
The belt conveyor suitable for multiple stations and the control method of the tensioning mechanism thereof are as follows:
referring to fig. 1, fig. 2 and fig. 3, fig. 1 is a schematic view of a first station state of a belt conveyor and a tensioning mechanism thereof suitable for multiple stations; FIG. 2 is a schematic diagram of a multi-station belt conveyor and a tensioning mechanism thereof in a state that tensioning steel wires are pulled up and anti-loose; FIG. 3 is a schematic view of a second station state of a belt conveyor and tensioning mechanism thereof suitable for multiple stations; in the attached figure 1, a movable head pulley 2 of the belt conveyor is in a working state at a first station chute 22, and a tensioning driving oil cylinder 19, a tensioning steel wire rope 18 and a belt 1 are in a tensioning state;
when the movable head wheel 2 of the multi-station belt conveyor needs to be moved from the first station chute 22 to the second station chute 23, the first step: the tensioning driving oil cylinder 19 extends out, the moving trolley 3 keeps a static state, at the moment, the tensioning force of the tensioning steel wire rope 18 and the belt 1 is continuously released, the heavy wheel 7 rises, when the tension of the tensioning driving oil cylinder 19 shows zero tension, the heavy wheel 7 stops rising, the tensioning driving oil cylinder 19 continues to extend forwards without stopping, and at the moment, the released tensioning steel wire rope 18 is pulled up by the driven pulley 11 under the action of the counterweight block 15 and keeps a low-pressure tensioning state without groove separation; the second step is that: the tensioning driving oil cylinder 19 continuously extends out, and the balancing weight 15 continuously descends; the third step: as shown in fig. 2, when the counterweight block 15 descends to the low level signal detector 17, the counterweight block 15 triggers the low level signal detector 17 to send out a stop signal, and the tensioning driving cylinder 19 stops extending and keeps still; the fourth step: the movable trolley 3 drives the movable head pulley 2 to move towards the direction of the second station chute 23, and at the moment, the counterweight 15 is pulled up under the action of the tensioning steel wire rope 18 and the counterweight steel wire rope 12. But the tensioning steel wire rope 18 still keeps a low-pressure tensioning state without groove separation during movement; the fifth step: when the movable head pulley 2 is driven by the movable trolley 3 to reach the second station chute 23, the movable head pulley 2 triggers the second station signal detector 21 to send out a stop signal, and the movable trolley 3 stops acting and is static and positioned; in the fifth step, the counterweight block rises along with the moving trolley 3 while moving, and if the high-position signal detector 16 detects a signal before the second station signal detector 21, the second step is repeated; and a sixth step: the tensioning driving oil cylinder 19 tensions the belt 1 to a set tension, and the starting preparation of the belt conveyor is completed.
When the movable head wheel 2 of the multi-station belt conveyor needs to be moved from the second station chute 23 to the first station chute 22, the first step: the tensioning driving oil cylinder 19 extends out, the moving trolley 3 keeps a static state, the tensioning force of the tensioning steel wire rope 18 and the belt 1 is continuously released at the moment, and the tensioning driving oil cylinder 19 stops extending out and keeps static until the display tension of the tensioning driving oil cylinder 19 is zero; the second step is that: the movable head pulley 2 moves from the second station chute 23 to the first station chute 22 along with the movable trolley 3, and the released tensioning steel wire rope 18 is pulled up by the driven pulley 11 under the action of the balancing weight 15 and keeps a low-pressure tensioning state without groove release; the movable trolley 3 continuously moves towards the first station chute 22, and the balancing weight 15 continuously descends; the third step: when the movable trolley 3 drives the movable head wheel 2 to reach the first station chute 22, the movable head wheel 2 triggers the first station signal detector 20 to send out a stop signal, and the movable trolley 3 stops acting and is static and positioned; the fourth step: the tensioning driving oil cylinder 19 tensions the belt 1 to a set tension, the counterweight block 15 is lifted to the top, and the belt conveyor is ready to start.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for a person skilled in the art, several modifications and additions can be made without departing from the method of the present invention, and these modifications and additions should also be considered as the protection scope of the present invention.
Claims (1)
1. A belt conveyor tensioning control method for multiple stations is based on a belt conveyor tensioning control system suitable for multiple stations and comprises a movable head pulley and a belt mounted on the movable head pulley, wherein the movable head pulley is arranged on a movable trolley, the movable trolley is arranged on a trolley track, a first station chute and a second station chute are respectively arranged below the trolley track, a first station signal detector and a second station signal detector are respectively arranged above the first station chute and the second station chute, which correspond to each other, a heavy wheel is arranged on the belt, the heavy wheel is connected with a tensioning driving oil cylinder through a tensioning steel wire rope, and a telescopic finishing device is arranged on the tensioning steel wire rope;
the telescopic finishing device comprises a movable pulley arranged below a steel wire rope, a second fixed pulley and a third fixed pulley which are used for tightly pressing the steel wire rope are respectively arranged on two sides of the movable pulley, the movable pulley is connected with a balancing weight through a balancing weight steel wire rope, and the balancing weight steel wire rope is supported through a fifth fixed pulley and a fourth fixed pulley;
a high-order signal detector and a low-order signal detector are arranged at the side position of the balancing weight;
a first direction-changing wheel and a second direction-changing wheel are arranged on the belt and positioned on two sides of the heavy wheel;
the method is characterized in that: the method comprises the following steps:
when the movable head pulley of the belt feeder of multistation needs to remove to the second station chute from first station chute, first step: the tensioning driving oil cylinder extends out, the moving trolley keeps a static state, the tensioning force of the tensioning steel wire rope and the belt is continuously released at the moment, the heavy wheel rises, when the tension of the tensioning driving oil cylinder shows zero tension, the heavy wheel stops rising, the tensioning driving oil cylinder continues to extend forwards without stopping, and the released tensioning steel wire rope is pulled up by the driven pulley under the action of the balancing weight and keeps a low-pressure tensioning state without disengaging; the second step is that: the tensioning driving oil cylinder continuously extends out, and the balancing weight continuously descends; the third step: when the balancing weight descends to the low-level signal detector, the balancing weight triggers the low-level signal detector to send out a stop signal, and the tensioning driving oil cylinder stops extending and keeps still; the fourth step: the movable trolley drives the movable head wheel to move towards the direction of the chute of the second station, at the moment, under the action of the tensioning steel wire rope and the counterweight steel wire rope, the counterweight is pulled up, but the tensioning steel wire rope still keeps a low-pressure tensioning state in motion and does not fall out of the chute; the fifth step: when the movable head wheel is driven by the movable trolley to reach the second station chute, the movable head wheel triggers the second station signal detector to send out a stop signal, and the movable trolley stops acting and is static and positioned; in the fifth step, the counterweight block rises while the moving trolley moves, and if the high-position signal detector detects a signal before the second station signal detector, the second step is repeated; and a sixth step: tensioning the belt to a set tension by the tensioning driving oil cylinder, and completing the starting preparation of the belt conveyor at the chute at the second station;
when the movable head pulley of the belt feeder of multistation needs to remove to first station chute from the second station chute, first step: the tensioning driving oil cylinder extends out, the movable trolley keeps a static state, the tensioning force of the tensioning steel wire rope and the belt is continuously released at the moment, and the tensioning driving oil cylinder stops extending out and keeps static until the display tension of the tensioning driving oil cylinder is zero; the second step is that: the movable head pulley moves from the second station chute to the first station chute along with the movable trolley, and the released tensioning steel wire rope is pulled up by the driven pulley under the action of the balancing weight and keeps a low-pressure tensioning state without disengaging from the chute; the movable trolley continuously moves towards the chute direction of the first station, and the balancing weight continuously descends; the third step: when the movable head wheel is driven by the movable trolley to reach the first station chute, the movable head wheel triggers the first station signal detector to send out a stop signal, and the movable trolley stops acting and is static and positioned; the fourth step: tensioning driving cylinder strains the belt to the pulling force of settlement, and the balancing weight is pulled and is risen to the top, and the belt feeder starts at first station chute department and prepares to accomplish.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710809180.1A CN109484801B (en) | 2017-09-10 | 2017-09-10 | Belt conveyor tensioning control system and control method suitable for multiple stations |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710809180.1A CN109484801B (en) | 2017-09-10 | 2017-09-10 | Belt conveyor tensioning control system and control method suitable for multiple stations |
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| CN109484801A CN109484801A (en) | 2019-03-19 |
| CN109484801B true CN109484801B (en) | 2021-02-05 |
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| CN201710809180.1A Active CN109484801B (en) | 2017-09-10 | 2017-09-10 | Belt conveyor tensioning control system and control method suitable for multiple stations |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109986830A (en) * | 2019-04-04 | 2019-07-09 | 许昌裕同印刷包装有限公司 | A kind of patch silk ribbon abnormal detection mechanism and patch silk ribbon equipment |
| CN110228634B (en) * | 2019-06-15 | 2021-02-26 | 江阴市华夏包装机械有限公司 | High-precision automatic bagging machine |
| CN112027519B (en) * | 2020-09-25 | 2022-02-08 | 徐州华东机械有限公司 | Drum-type belt conveyor |
| CN114194722B (en) * | 2021-12-23 | 2024-01-19 | 河南省德耀节能科技股份有限公司 | Suspension type material conveying system for material shed |
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| CN1493509A (en) * | 2003-10-08 | 2004-05-05 | 张秀菊 | New style round pipe type rubber belt conveying machine capable of expansion, lifting and nontwisting |
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| CN103420130A (en) * | 2012-05-18 | 2013-12-04 | 宝山钢铁股份有限公司 | Dual-system material-smoothening automatic-balancing regulating control device and method |
| CN203359408U (en) * | 2013-07-18 | 2013-12-25 | 四川马蒂薛工程技术有限公司 | Tension device for belt conveyor |
| KR20160126758A (en) * | 2015-04-24 | 2016-11-02 | 현대제철 주식회사 | Apparatus for preventing swerving of belt conveyor |
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|---|---|---|---|---|
| CN1493509A (en) * | 2003-10-08 | 2004-05-05 | 张秀菊 | New style round pipe type rubber belt conveying machine capable of expansion, lifting and nontwisting |
| CN201330055Y (en) * | 2009-01-12 | 2009-10-21 | 戴庆为 | Head moving and feeding device for fixed type sealing tape machine |
| CN103420130A (en) * | 2012-05-18 | 2013-12-04 | 宝山钢铁股份有限公司 | Dual-system material-smoothening automatic-balancing regulating control device and method |
| CN203359408U (en) * | 2013-07-18 | 2013-12-25 | 四川马蒂薛工程技术有限公司 | Tension device for belt conveyor |
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