BC90MA Holdback Bckstop Clutch with High Torque Transmission
Technical Datas of Holdback Backstop Clutch
SUMA automatic backstops are precision built safety devices designed to protect inclined conveyors or vertical elevators from the dangers of gravity accelerated reversed runaway. To be assured of reliable protection and the longest possible service life, it is important that the following recommendations be observed for the installation, lubrication, and maintenance of Marland backstops. As soon as the unit has been received, examine it carefully for damage in transit and report any breakage discovered to the transit company at once. All tags and bulletins attached to the unit should be carefully read before placing the unit in operation and then filed for future reference.
Dimensions and Capacities of Holdback Backstop Clutch
| Backstop Size | Torque N-m | Rated Torque lb. ft. | Max RPM | Load "L" Kgs. | Load "L" lbs. | Max.* Bore mm | Max.* Bore in. | Max.* Bore Keyway mm | Max.* Bore Keyway in. | Ship Weight Kgs. | Ship Weight lbs. |
| 3MA | 4067 | 3,000 | 300 | 510 | 1,120 | 75 | 2.94 | 20 x 4.9 | .75 x .25 | 46 | 100 |
| 6MA | 8135 | 6,000 | 250 | 920 | 2,000 | 95 | 3.69 | 25 x 5.4 | .88 x .31 | 69 | 150 |
| 12MA | 16270 | 12,000 | 210 | 1325 | 2,880 | 115 | 4.50 | 32 x 7.4 | 1.00 x .38 | 100 | 220 |
| 18MA | 24405 | 18,000 | 180 | 1776 | 3,860 | 140 | 5.44 | 36 x 8.4 | 1.25 x .44 | 152 | 330 |
| Backstop Size | A | B | C | D | E | F | G |
| mm | in. | mm | in. | mm | in. | mm | in. | mm | in. | mm | in. | mm | in. |
| 3MA | 210 | 8.25 | 143 | 5.62 | 146 | 5.75 | 64 | 2.50 | 76 | 3 | 813 | 32 | 105 | 4.12 |
| 6MA | 248 | 9.75 | 165 | 6.50 | 169 | 6.62 | 70 | 2.75 | 102 | 4 | 914 | 36 | 124 | 4.87 |
| 12MA | 292 | 11.50 | 203 | 8.00 | 178 | 7.00 | 83 | 3.25 | 127 | 6 | 1270 | 50 | 146 | 5.75 |
| 18MA | 343 | 13.50 | 235 | 9.25 | 189 | 7.44 | 92 | 3.62 | 152 | 6 | 1422 | 56 | 168 | 6.6 |
| Backstop Size | Torque N-m | Rated Torque lb. ft. | Max RPM | Load "L" Kgs | Load "L" lbs. | Max.* Bore mm | Max.* Bore in. | Max.* Bore Keyway mm | Max.* Bore Keyway in. | Ship Weight Kgs. | Ship Weight lbs. |
| 27MA | 36607 | 27,000 | 150 | 2259 | 4,910 | 165 | 6.50 | 40 x 9.4 | 1.50 x .50 | 207 | 450 |
| 45MA | 61012 | 45,000 | 135 | 3450 | 7,500 | 180 | 7 | 45 x 10.4 | 1.75 x .56 | 276 | 600 |
| 63MA | 85417 | 63,000 | 120 | 4462 | 9,700 | 205 | 8 | 50 x 11.4 | 2.00 x .69 | 381 | 830 |
| 90MA | 122024 | 90,000 | 105 | 6072 | 13,200 | 235 | 9 | 56 x 12.4 | 2.50 x .75 | 520 | 1,130 |
| 135MA | 183035 | 135,000 | 90 | 8464 | 18,400 | 265 | 10 | 63 x 12.4 | 2.50 x .87 | 690 | 1,500 |
| 180MA | 244047 | 180,000 | 80 | 10580 | 23,000 | 300 | 11.75 | 70 x 14.4 | 3.00 x 1.00 | 966 | 2,100 |
| Backstop Size | A | B | C | D | E | F | G |
| mm | in. | mm | in. | mm | in. | mm | in. | mm | in. | mm | in. | mm | in. |
| 27MA | 384 | 15.12 | 254 | 10.00 | 222 | 8.75 | 98 | 3.87 | 178 | 7 | 1676 | 66 | 191 | 7.50 |
| 45MA | 445 | 17.50 | 289 | 11.37 | 235 | 9.25 | 105 | 4.12 | 203 | 8 | 1829 | 72 | 216 | 8.50 |
| 63MA | 498 | 19.62 | 311 | 12.25 | 244 | 9.62 | 127 | 5.00 | 254 | 10 | 1981 | 78 | 244 | 9.62 |
| 90MA | 584 | 25.75 | 362 | 14.25 | 276 | 10.87 | 140 | 5.50 | 305 | 12 | 2083 | 82 | 270 | 10.62 |
| 135MA | 654 | 30.37 | 406 | 16.00 | 314 | 12.37 | 143 | 5.62 | 381 | 15 | 2235 | 88 | 308 | 12.12 |
| 180MA | 772 | 34.50 | 419 | 16.50 | 330 | 13.00 | 159 | 6.25 | 457 | 18 | 2388 | 94 | 349 | 13.75 |
Mounting and Coupling of Holdback Backstop Clutch
When the conveyor decelerates and the cam subsequently comes to rest, the spring actuated roller cage, Illustration 1, has already positioned the rollers into the contact zone. All rollers have been positively guided to engage uniformly and maintain their relative positions accurately to assure uniform load distribution. The rollers then engage in compression between the precision ground, hardened cam plane surfaces and the inside diameter of the outer race. Relative motion between the cam and outer race is not required to engage rollers. When the backstop is in the "engaged" or "backstopping" condition, the cam, rollers, and outer race are relatively stationary and therefore, not subject to wear if used within normal tabulated rating.
Mounting Details of Holdback Backstop Clutch
Marland backstops are furnished with a clearance fit between the bore and shaft for easy field installations. The key should be a “drive tight” fit on the sides only. As a result a method of axial shaft retention is required for all backstops. The preferred method of accomplishing this is with the use of set collars which can be furnished by Marland upon request.
Pictures of Holdback Backstop Clutch
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Holdback Bckstop Clutch With High Torque Transmission Precision Built Images
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