CN111846755A - Stable support piece of conveyer belt module - Google Patents
Stable support piece of conveyer belt module Download PDFInfo
- Publication number
- CN111846755A CN111846755A CN202010620423.9A CN202010620423A CN111846755A CN 111846755 A CN111846755 A CN 111846755A CN 202010620423 A CN202010620423 A CN 202010620423A CN 111846755 A CN111846755 A CN 111846755A
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- Prior art keywords
- ball
- support
- supporting
- conveyor belt
- belt module
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 230000004888 barrier function Effects 0.000 claims abstract description 14
- 230000003014 reinforcing effect Effects 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 10
- 230000003019 stabilising effect Effects 0.000 claims 1
- 238000005192 partition Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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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
- 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
- B65G15/30—Belts or like endless load-carriers
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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
- 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
- B65G15/30—Belts or like endless load-carriers
- B65G15/50—Endless load-carriers consisting of a series of parallel ropes or belt strips
- B65G15/52—Endless load-carriers consisting of a series of parallel ropes or belt strips interconnected by transverse slats
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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
- 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
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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
- B65G39/00—Rollers, e.g. drive rollers, or arrangements thereof incorporated in roller-ways or other types of mechanical conveyors
- B65G39/02—Adaptations of individual rollers and supports therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rollers For Roller Conveyors For Transfer (AREA)
Abstract
The invention discloses a stable support member for a conveyor belt module, wherein the conveyor belt module comprises a sheet and a plurality of balls assembled in the sheet, a ball frame is arranged in the sheet, the balls are arranged in the ball frame, two sides of each ball are provided with ball barriers, and the lower parts of the balls protrude out of the sheet, and the stable support member is characterized by comprising: a plurality of support wheels and a support shaft; a plurality of supporting wheels are sleeved on a supporting shaft, a plurality of ball grooves used for containing the lower parts of balls are formed in the outer edge of the supporting wheel, each ball groove contains one ball, supporting parts are formed on two sides of each ball groove, the top surface of each supporting part is abutted to the bottom of each ball partition, each supporting wheel is abutted to at least three ball partitions, gaps are formed between the balls contained in the ball grooves and the inner side surfaces of the ball grooves, and supporting stability of the conveying belt is enhanced.
Description
Technical Field
The invention relates to the field of conveyor belts, in particular to a stable support for a conveyor belt module.
Background
At present, compared with a belt conveyor belt, the modular conveyor belt is not prone to snaking and deflection, has the characteristics of cutting resistance, collision resistance, oil resistance, water resistance and the like, can be widely applied to the fields of assembly lines, automatic production, logistics transmission and the like, and is necessary equipment for conveying articles in various fields.
The existing modular conveying belt is formed by combining a plurality of modular units, a plurality of balls are arranged in a sheet of each module, the conveying belt is driven by gears to move, meanwhile, the balls can rotate after being driven, and the moving direction of goods driven by the rotation of the balls is perpendicular to the conveying direction of the conveying belt, so that the goods can be sorted. For example, goods are conveyed on the conveying belt in the front-back direction at the beginning, and when the goods reach a sorting point, the corresponding balls rotate to drive the goods to move in the left-right direction and exit from the main conveying belt, so that sorting is realized.
The overall structure of the modular conveyor belt can refer to the attached figure 1 of the specification of the chinese invention with the application number of cn201910926125.x, because the length of the conveyor belt is usually longer, and the conveyor belt has a tendency of sagging under the action of its own weight, and in addition, because the conveyor belt needs to play a role of conveying goods and also needs to bear the weight of the goods, support wheels are arranged at intervals below the conveyor belt to provide stable support for the conveyor belt.
The structure of the existing conveyor belt module can refer to the chinese invention with application number cn201910922882.x, the conveyor belt module comprises a sheet and a plurality of balls assembled in the sheet, two sides of the balls are ball barriers, and the existing support wheel is supported in the following manner: the supporting wheel is a common cylindrical wheel, the outer edge of the supporting wheel is a cylindrical surface, and a supporting surface at the top of the supporting wheel is in direct contact with the lower part of the ball bearing so as to support the conveying belt. However, in the actual working process, the balls at the supporting points are often easily worn because the balls are injection-molded parts, and the outer layers of the balls are usually made of soft plastics, so that the balls frequently interact with the supporting wheels due to the weight born by the conveyor belt and the generated vibration, and the soft plastics layer is easily damaged, thereby frequently replacing the conveyor belt modules and bringing about higher maintenance cost.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a stable support for a conveyor belt module, which avoids the direct contact between the balls and the support wheel by arranging a groove capable of accommodating the lower part of the balls on the outer edge surface of the support wheel, so that the balls above the support wheel are not worn.
The invention is realized by the following technical scheme:
a stabilizing support for a conveyor belt module comprising a sheet and a plurality of balls assembled in the sheet, a ball cage being provided in the sheet, the balls being provided in the ball cage, each ball being flanked by ball barriers, the lower part of the ball protruding from the sheet, the support comprising: a plurality of support wheels and a support shaft; the supporting wheels are sleeved on one supporting shaft, a plurality of ball grooves used for containing the lower parts of the balls are formed in the outer edge of one supporting wheel, each ball groove contains one ball, supporting parts are formed on two sides of each ball groove, the top surfaces of the supporting parts are abutted to the bottoms of the ball barriers, each supporting wheel is abutted to at least three ball barriers, and gaps are formed between the balls contained in the ball grooves and the inner side surfaces of the ball grooves.
Furthermore, each supporting wheel forms two ball grooves to accommodate two adjacent balls, and the same supporting wheel abuts against the three ball barriers.
Furthermore, the ball groove is arranged on the outer edge of the supporting wheel in a surrounding mode, and the cross section of the ball groove is V-shaped.
Further, the supporting part is a cylindrical surface.
Further, the width of the support part is equal to the width of the ball fence.
Further, the width of each support part is equal.
Further, the support for the conveyor belt module further comprises a bearing; the bearing sleeve is arranged at the outer edge of the supporting shaft, and the supporting wheel is arranged at the outer edge of the bearing in a sleeved mode.
Furthermore, a ring of annular reinforcing ribs are arranged at the center of the inner edge of the supporting wheel, two bearing grooves which are bilaterally symmetrical are formed between the reinforcing ribs and the inner edge of the supporting wheel, and the two bearings are respectively arranged in the two bearing grooves.
Further, the inner diameter of the reinforcing rib is smaller than that of the bearing.
Furthermore, the opening of the bearing groove is provided with a chamfer structure which is obliquely arranged upwards.
Compared with the prior art, the invention can achieve the following beneficial effects: set up a plurality of ball grooves that can the holding ball lower part on the outer fringe of supporting wheel, simultaneously through each the supporting part of supporting wheel supports at least three ball jube, can guarantee to realize under the prerequisite of stable supporting to the conveyer belt module at both sides supporting part, has avoided the ball directly to contact with the supporting wheel, and the outer wearing and tearing of being difficult to reappear of ball have prolonged the life of ball, has also protected the supporting wheel to support at least three ball jube simultaneously, makes the conveyer belt support more firm.
Drawings
FIG. 1 is a schematic view of the conveyor belt as a whole;
FIG. 2 is a schematic view of a conveyor belt module;
FIG. 3 is a perspective view of the present invention in cooperation with a conveyor belt module;
FIG. 4 is a front view of the present invention in cooperation with a conveyor belt module;
FIG. 5 is a front view of the support wheel;
fig. 6 shows a perspective view of the support wheel.
In the figure: 10. a sheet material; 11. a ball cage; 20. a ball bearing; 30. a support wheel; 31. a ball groove; 32. a support portion; 34. reinforcing ribs; 35. a bearing groove; 33. a chamfering structure; 40. a support shaft; 50. and a bearing.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
The invention discloses a support for a conveyor belt module, and in order to facilitate understanding of the background, the following first describes an overall conveyor belt:
the conveying belt module belongs to a local component module unit in the modular conveying belt, as shown in fig. 1, the modular conveying belt is formed by mutually splicing a plurality of modules, the lower surface of the conveying belt is provided with clamping grooves which are longitudinally distributed, the clamping grooves are matched with teeth of the gears on the conveying belt, and the teeth of the gears drive the conveying belt to advance when the gears rotate. Wherein a single conveyer belt module includes sheet 10 and spacing ball 20 on sheet 10, and the gear drive sheet 10 motion to drive the goods and move along the length direction of conveyer belt, when the goods arrived near the letter sorting point, adopt other mechanisms (for example sorting machine) drive ball 20 to rotate, make the goods move along the width direction of conveyer belt, thereby realize the letter sorting function.
The conveyor belt module comprises a sheet 10 and a plurality of balls 20 assembled in the sheet 10, wherein a ball frame is arranged in the sheet 10, the balls 20 are arranged in the ball frame, two sides of each ball 20 are ball barriers 11, and the lower parts of the balls 20 protrude out of the sheet 10, as shown in fig. 2.
Referring to fig. 3 to 4, the supporting member for a conveyor belt module disclosed by the present invention includes a supporting wheel 30 and a supporting shaft 40, wherein the supporting wheel 30 is sleeved on the supporting shaft 40, the outer edge of the supporting wheel 30 is provided with two adjacent ball grooves 31 for accommodating the lower portions of the balls 20 (i.e. the portions of the balls 20 protruding below the sheet 10), two sides of each ball groove 31 form a supporting portion 32, and the top surface of each supporting portion 32 is abutted against the bottom of the ball fence 11, so that each supporting wheel 30 forms three supporting portions 32 and is abutted against three ball fences 11 at the same time, thereby increasing the supporting force of each supporting wheel 30 on the conveyor belt module and greatly promoting the stable operation of the conveyor module; a gap is formed between the ball 20 received in the ball groove 31 and the inner side surface of the ball groove 31, i.e., there is no contact between the ball 20 and the ball groove 31. Of course, it is understood that the supporting shaft 40 is not suspended, and other components, such as a supporting base, a workbench, etc., are connected to both ends of the supporting shaft, which are not included in the scope of the present invention, and therefore not shown in the drawings, and will not be described again.
The outer edge of the supporting wheel 30 is provided with a ball groove 31 capable of accommodating the lower part of the ball 20, and the ball barrier 11 is supported by the supporting parts 32 on both sides, so that the ball 20 is prevented from directly contacting the supporting wheel 30 on the premise that the supporting parts 32 on both sides can ensure stable support of the conveyor belt module. In the process of conveying the conveying belt at a high speed, because the balls 20 and the supporting wheel 30 are not in contact with each other, the outer layer of the balls 20 is not easy to abrade, the service life of the balls 20 is prolonged, meanwhile, the supporting wheel 30 is protected, the service life of the supporting wheel 30 is prolonged, and frequent replacement and maintenance are avoided; in addition, because the friction between the conveying belt module and the supporting piece is reduced, the influence on the transmission of the conveying belt is less, and unnecessary loss is not easily caused to the motor and the gear.
Preferably, the ball groove 31 is opened around the outer edge of the support wheel 30, and the cross section of the ball groove 31 is V-shaped. Of course, the structure of the ball groove 31 is not limited to the V-shaped groove, and may be a U-shaped groove, a semicircular groove, or any other structure type groove as long as it is ensured that any type of contact and friction is not generated between the side wall of the ball groove 31 and the ball 20.
Preferably, referring to fig. 5 to 6, the support 32 is a cylindrical surface. Because the edge of the cylindrical surface is a horizontal straight line, the ball partition 11 can be stably supported; further, the widths of each supporting portion 32 are equal, so that the contact area between each supporting portion 32 and the ball partition 11 is equal, the conveying belt is guaranteed to be subjected to balanced friction resistance in the operation process, the operation stability of the equipment is guaranteed, in addition, in the process that the conveying belt is conveyed forwards at a high speed, the supporting wheel 30 needs to rotate around the supporting shaft 40 at a high speed, the cylindrical surface can be always attached to the lower portion of the conveying belt and enables the conveying belt to transmit stably, and vibration and noise of the conveying belt caused by the fact that the surface is uneven are avoided.
Preferably, with reference to fig. 4, the width of the support portion 32 is equal to the width of the ball cage 11. Since the bottom of the ball cage 11 abuts against the support portion 32, the contact area therebetween is increased to enhance the stability of the bearing, and therefore, when the width of the support portion 32 is made not smaller than the width of the ball cage 11, the contact area can be maximized. Meanwhile, the width of the support portion 32 cannot be too large, which would interfere with the adjacent balls 20 and cause friction, so it is preferable that the width of the support portion 32 is equal to the width of the ball barriers 11.
Preferably, the present invention also includes a bearing 50. The bearing 50 is sleeved on the outer edge of the supporting shaft 40, and the supporting wheel 30 is sleeved on the edge of the bearing 50; the bearing 50 serves to reduce frictional resistance between the support wheel 30 and the support shaft 40, reduce abrasion generated between the wheel shafts, and be easily replaced.
Further preferably, referring to fig. 4 to 6, the number of the bearings 50 is 2, a ring of annular reinforcing ribs 34 is disposed at the center position of the inner edge of the supporting wheel 30, and since the supporting wheel 30 has a hollow axis, the reinforcing ribs 34 and the inner edge of the supporting wheel 30 can form two grooves, which are bilaterally symmetrical bearing grooves 35, and the two bearings 50 are disposed in the two bearing grooves 35, respectively. The purpose of this embodiment is: since the concave ball groove 31 is formed at the center of the outer edge of the support wheel 30, the corresponding position is thin, the connection strength is low, and if the bearing 50 is installed at the center of the support wheel 30 in a conventional manner, cracking due to insufficient strength is easily caused. Therefore, a rib 34 is additionally provided at this position, so that the connection strength at the center position is enhanced, and the bearing grooves 35 at the left and right sides are formed, and the support wheel 30 is stably connected to the support shaft 40 by installing two symmetrical bearings 50.
Further preferably, the inner diameter of the rib 34 is smaller than the inner diameter of the bearing 50. As described above, the reinforcing rib 34 may form two bearing grooves 35 for mounting the bearing 50 while the inner race of the bearing 50 is engaged with the support shaft 40, and the inner diameter of the reinforcing rib 34 is made smaller than the inner diameter of the bearing 50, i.e., the reinforcing rib 34 is retracted without coming into contact with the surface of the support shaft 40, thereby reducing unnecessary frictional resistance between the support wheel 30 and the support shaft 40.
Preferably, the opening of the bearing groove 35 is further provided with a chamfer structure 33 opening obliquely upwards. The chamfer structure 33 has the advantages that the bearing groove 35 is of a structure with a wide upper part and a narrow lower part, so that the bearing 50 can be easily sleeved in during assembly, and meanwhile, the chamfer can prevent sharp edges from scratching hands, so that the safety is improved.
Preferably, the widths of the two supporting portions 32 are equal, which is used for keeping the gravity borne by the two supporting portions 32 consistent, so as to avoid uneven stress on the two sides, thereby avoiding the situation that the supporting portion 32 on one side is worn quickly, and ensuring the service life of the supporting wheel 30.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. A stabilizing support for a conveyor belt module comprising a sheet and a plurality of balls assembled in the sheet, a ball cage being provided in the sheet, the balls being provided in the ball cage, each ball being flanked by ball barriers, the lower part of the ball protruding from the sheet, the support comprising: a plurality of support wheels and a support shaft; the supporting wheels are sleeved on one supporting shaft, a plurality of ball grooves used for containing the lower parts of the balls are formed in the outer edge of one supporting wheel, each ball groove contains one ball, supporting parts are formed on two sides of each ball groove, the top surfaces of the supporting parts are abutted to the bottoms of the ball barriers, each supporting wheel is abutted to at least three ball barriers, and gaps are formed between the balls contained in the ball grooves and the inner side surfaces of the ball grooves.
2. A stabilizing support for a conveyor belt module as in claim 1 wherein each of said support wheels defines two of said ball grooves for receiving two adjacent balls, one of said support wheels abutting three of said ball barriers.
3. A stabilizing support for a conveyor belt module as in claim 1 wherein said ball groove opens around the outer edge of said support wheel, said ball groove being V-shaped in cross section.
4. A stabilizing support for a conveyor belt module according to claim 1, wherein said support is cylindrical.
5. A stabilizing support for a conveyor belt module according to claim 1 or claim 3, wherein the width of the support portion is equal to the width of the ball barriers.
6. A stabilizing support for a conveyor belt module as in claim 1 wherein each of the support portions is of equal width.
7. The stabilizing support for a conveyor belt module as in claim 1 further comprising a bearing; the bearing sleeve is arranged at the outer edge of the supporting shaft, and the supporting wheel is arranged at the outer edge of the bearing in a sleeved mode.
8. A stabilising support for a conveyor belt module according to claim 6, wherein the support wheel has an annular rib centrally located on an inner edge thereof, the rib and the inner edge of the support wheel defining two bilaterally symmetrical bearing grooves, the two bearings being disposed in the two bearing grooves respectively.
9. A stabilizing support for a conveyor belt module as in claim 7 wherein the inner diameter of the reinforcing bars is less than the inner diameter of the bearings.
10. A stabilizing support for a conveyor belt module according to claim 7, wherein the bearing slot opening has a chamfered configuration that opens obliquely upward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010620423.9A CN111846755A (en) | 2020-07-01 | 2020-07-01 | Stable support piece of conveyer belt module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010620423.9A CN111846755A (en) | 2020-07-01 | 2020-07-01 | Stable support piece of conveyer belt module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111846755A true CN111846755A (en) | 2020-10-30 |
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ID=72988286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010620423.9A Pending CN111846755A (en) | 2020-07-01 | 2020-07-01 | Stable support piece of conveyer belt module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111846755A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112696472A (en) * | 2021-03-24 | 2021-04-23 | 华南新海(深圳)科技股份有限公司 | Driving belt tensioning device with annular groove and belt driving system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207174680U (en) * | 2017-07-05 | 2018-04-03 | 边均明 | Straight line carrier chain |
| CN208856315U (en) * | 2018-09-20 | 2019-05-14 | 广州盛原成自动化科技有限公司 | Chain conveyor line and its cargo location regulating device |
| CN111017479A (en) * | 2019-12-10 | 2020-04-17 | 六安市富源塑胶五金制品有限公司 | Chain plate type mesh belt |
| CN210619261U (en) * | 2019-06-04 | 2020-05-26 | 浙江佐尔传动设备有限公司 | Novel chain slat type conveyer belt structure |
| CN213010154U (en) * | 2020-07-01 | 2021-04-20 | 深圳市华南新海传动机械有限公司 | Stable support piece of conveyer belt module |
-
2020
- 2020-07-01 CN CN202010620423.9A patent/CN111846755A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207174680U (en) * | 2017-07-05 | 2018-04-03 | 边均明 | Straight line carrier chain |
| CN208856315U (en) * | 2018-09-20 | 2019-05-14 | 广州盛原成自动化科技有限公司 | Chain conveyor line and its cargo location regulating device |
| CN210619261U (en) * | 2019-06-04 | 2020-05-26 | 浙江佐尔传动设备有限公司 | Novel chain slat type conveyer belt structure |
| CN111017479A (en) * | 2019-12-10 | 2020-04-17 | 六安市富源塑胶五金制品有限公司 | Chain plate type mesh belt |
| CN213010154U (en) * | 2020-07-01 | 2021-04-20 | 深圳市华南新海传动机械有限公司 | Stable support piece of conveyer belt module |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112696472A (en) * | 2021-03-24 | 2021-04-23 | 华南新海(深圳)科技股份有限公司 | Driving belt tensioning device with annular groove and belt driving system |
| CN112696472B (en) * | 2021-03-24 | 2021-06-01 | 华南新海(深圳)科技股份有限公司 | Driving belt tensioning device with annular groove and belt driving system |
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