In a brake device configured to perform braking and releasing of a disc by moving a rod having a lining at a leading end of the rod by a spring device, a cylinder tube of a pressure control unit is arranged adjacent to a pressure storage unit configured to store a compressed fluid. When the disc is to be released, a pressure-receiving piston is moved to a releasing position. When the disc is to be braked, the pressure-receiving piston is returned to braking position.

In a brake device configured to perform braking and releasing of a disc by moving a rod having a lining at a leading end of the rod by a spring device, a cylinder tube of a pressure control unit is arranged adjacent to a pressure storage unit configured to store a compressed fluid. When the disc is to be released, a pressure-receiving piston is moved to a releasing position. When the disc is to be braked, the pressure-receiving piston is returned to braking position.

A modular reel drive assembly comprises two reel drive tower modules (12, 14), a reel hub adapter (54) and a reel hub adapter support module (22, 24). The hub adapter support module (22, 24) comprises at least one support pin which is configured to be movable between a storage position in which the at least one support pin is not aligned with at least one aperture (38, 39, 40, 41) on the hub adapter support module (22, 24) and an operational position in which the support pin is aligned with at least one aperture (38, 39, 40, 41) on the hub adapter support module (22, 24).

A modular reel drive assembly comprises two reel drive tower modules (12, 14), a reel hub adapter (54) and a reel hub adapter support module (22, 24). The hub adapter support module (22, 24) comprises at least one support pin which is configured to be movable between a storage position in which the at least one support pin is not aligned with at least one aperture (38, 39, 40, 41) on the hub adapter support module (22, 24) and an operational position in which the support pin is aligned with at least one aperture (38, 39, 40, 41) on the hub adapter support module (22, 24).

A system includes a first transmission having a first planetary gearset, a first drive shaft, and a first annular sleeve. The first annular sleeve is positioned circumferentially about the first drive shaft, and the first annular sleeve is configured to move axially relative to the first drive shaft and the first planetary gearset from a first axial position in which the first annular sleeve engages a first sun gear of the first planetary gearset to a second axial position in which the first annular sleeve engages a first ring gear of the first planetary gearset to adjust a gear ratio of the first transmission.

A pneumatic load balancing system comprises a pressure sensor for determining the pressure in a chamber of the actuating cylinder, and a controller for controlling the air pressure in the chamber of the actuating cylinder via at least one air supply valve. The controller is configured to during a load balancing sequence continuously or periodically obtain a current air pressure in the chamber from the pressure sensor when supplying air to the chamber via said at least one air supply and to determine a balancing air pressure in the chamber when, if air fed to the chamber, the air pressure stops increasing or when the gradient of the pressure increase is below a pre-determined threshold value; or if the air pressure is let out from the chamber, the air pressure starts to decrease. The balancing air pressure thus determined is then used as the balancing air pressure for the actuating cylinder of the pneumatic load balancing system. Hereby an automatic setting of the air pressure required for load balancing can be achieved. The user does then not need to manually feed the required air-pressure and the system will use the correct air-pressure and mistakes in setting of the air pressure can be avoided.

A pneumatic load balancing system comprises a pressure sensor for determining the pressure in a chamber of the actuating cylinder, and a controller for controlling the air pressure in the chamber of the actuating cylinder via at least one air supply valve. The controller is configured to during a load balancing sequence continuously or periodically obtain a current air pressure in the chamber from the pressure sensor when supplying air to the chamber via said at least one air supply and to determine a balancing air pressure in the chamber when, if air fed to the chamber, the air pressure stops increasing or when the gradient of the pressure increase is below a pre-determined threshold value; or if the air pressure is let out from the chamber, the air pressure starts to decrease. The balancing air pressure thus determined is then used as the balancing air pressure for the actuating cylinder of the pneumatic load balancing system. Hereby an automatic setting of the air pressure required for load balancing can be achieved. The user does then not need to manually feed the required air-pressure and the system will use the correct air-pressure and mistakes in setting of the air pressure can be avoided.

The present invention relates to an apparatus for passively preventing a marine floating body from twisting during mooring by controlling tension in ropes connected to the marine floating body within a predetermined allowable limit. The apparatus includes: a floating main body connected to the ropes, fixed on the sea, and providing a space for marine work; winches disposed on the floating main body and retracting or releasing the ropes fixing the floating main body; fairleads disposed on portions of the floating main body and guiding the ropes to the winches through themselves; and braking units disposed on portions of the floating main body at a predetermined distance from the fairleads, with the ropes passing through the fairleads and themselves, and controlling a speed of the ropes that are retracted to the winches at a predetermined speed.

The present invention discloses a multi-channel impact-resistant intelligent-constant-deceleration hydraulic braking system, and relates to the field of safety braking control for mine hoist systems. A technical point of the braking system is that the braking system includes a braking circuit formed by a constant-deceleration hydraulic system, a constant-deceleration electrical closed-loop control system, and a detection and feedback apparatus. The constant-deceleration hydraulic system is provided with N+1 independent complete oil return channels, where N is a positive integer greater than or equal to 3. The oil return channels are disposed in parallel to form parallel independent braking circuits, that is, are multi-channel and do not have a common output point. The oil return channel includes a backup oil source, an electro-hydraulic signal conversion and amplification component, an operating mode switching apparatus, and an execution component that are sequentially connected. The oil return channels include one backup channel and N working channels. Functions such as constant-deceleration braking, impact and vibration limiting, rope slip prevention, derailing prevention, and overwinding prevention can be safely and reliably achieved when a mine hoist system normally stops, performs operation braking or performs safety braking, thereby greatly reducing an accident rate.

A drawworks system for a mineral extraction system includes a drum mounted on a drum shaft and configured to support a cable. The system also includes a gearbox assembly having a gearbox housing, a gearbox supported by the gearbox housing and having a gearbox input shaft and a gearbox output shaft, wherein the gearbox input shaft is configured to be coupled to at least one motor and the gearbox output shaft is coupled to the drum shaft to drive rotation of the drum shaft and the drum, and a brake supported by the gearbox housing and coupled to the drum shaft to block rotation of the drum shaft and the drum, wherein the gearbox and the brake are positioned on one side of the drum along an axial axis of the drawworks system.