Constant deceleration hydraulic station

The hoist hydraulic station is the hydraulic power source of the hoist brake system, and provides services for the brakes such as opening, closing, working braking, and safety braking.

Safe braking conditions are an important working process of the hoist. In the past, the traditional safe braking process was mainly the second-level braking in the well and the emergency first-level braking at the wellhead. The second-level braking was performed with a fixed braking torque. The brake disc does not change with the load condition of the hoist. In fact, the hoist brakes under lifting and lowering conditions, under heavy and light loads, single rope and multi-rope brakes, etc. If the traditional fixed torque is used for unified braking, it will be The brake deceleration is very different, which can not meet the safety, stability and reliability. Especially when the friction wheel multi-rope hoist is doing second-level braking, the steel deceleration and drum may be caused due to the excessive brake deceleration The dynamic slip between them causes the increase of unsafe factors. Therefore, seeking constant deceleration dynamic control measures under safe braking has become the ideal safe braking direction of various mine hoists.

Characteristics of constant deceleration hydraulic system

(1) The constant deceleration hydraulic system adopts a completely independent dual-tank dual-station type, one for one and one for standby. When a certain station is completely unable to be put into use, the electrical control and hydraulic control can be switched to another station Continue to maintain system work and carry out non-stop repair and maintenance work.

(2) Applicable to multi-rope, single-rope, single-cylinder, double-cylinder (with adjusting rope) hoist.

(3) On the multi-rope friction hoist, each station can use three-channel redundancy technology. When constant deceleration and safe braking are performed, once a channel fails, the hydraulic system combines the closed-loop adjustment function of the electrical control system. It still maintains its constant deceleration braking to ensure that the constant deceleration function can be implemented smoothly in the event of a fault.

(4) With independent working brake and safety brake control circuit, the constant deceleration safety brake actuator adopts a reliable and no-wait design concept, so that the constant deceleration safety brake has no time and space gaps, and further increases the safety brake reliability .

(5) The constant deceleration hydraulic circuit parameter setting is carried out jointly by the gate control system test bench and the control cabinet, so that the constant deceleration hydraulic and electrical parameters are set before shipment to 90%, making the on-site constant deceleration debugging link convenient and fast, no longer dependent on Waiting for the site conditions.

(6) Install an emergency oil return device. In the extreme case where the hydraulic circuit is completely ineffective and cannot reliably drain the oil, the oil in the brake is bypassed by the emergency manual oil return device to ensure safe braking.

(7) During the emergency braking of the system, the constant deceleration brake is put in advance. If the constant deceleration fails completely, the second-level brake is put in. If the second-level brake fails, the first-level brake is put in again to ensure the safety and reliability of the hoist. parking. This constant deceleration hydraulic system can prevent the hoist from sliding rope, broken rope, steel wire rope tremor and mechanical system impact.

(8) The hydraulic system adopts imported hydraulic parts and electrical appliances such as Italy Atos, Japan Yuken, Germany Rexroth and Sweden ABB.

(9) The system has a complete hydraulic parameter detection function, making the full hydraulic system in an effective control and monitoring state.

(10) All the oil inlet and outlet links adopt fine filtration to reduce oil circuit pollution and effectively protect the liquid circuit components; the oil outlet filter adopts a large flow design to make the brake return oil quickly and ensure the reliable braking of the brake device.

(11) Equipped with automatic temperature increase control structure, which can automatically increase temperature when the oil temperature is low and needs to be put into work.

(12) Equipped with automatic oil cooling control mechanism to cool the hydraulic system temperature to a reasonable range when the oil temperature is high.

(13) The fully enclosed design protects the hydraulic system from environmental influences and allows the system to work in a clean environment.

(14) The whole system adopts imported ferrule connection technology to ensure safety, reliability and no leakage.

Features of constant deceleration double closed-loop electrical control system

(1) The constant deceleration control cabinet tracks the main electronic control system and accepts the working direction signal, safety signal and gate control signal of the main electronic control system, and reacts to the normal working instructions and working brake instructions issued by the main electronic control; The electronic control system conveys the sensory measurement and control information of the intelligent brake system and the hydraulic system.

(2) When an abnormal situation occurs, the constant deceleration control cabinet is disconnected from the main electronic control, enters an independent safety processing program, and automatically makes a judgment to select constant deceleration braking. At the same time, referring to the transmitted position, speed, oil pressure and braking time history signals, it automatically determines whether it is necessary to release the constant deceleration braking action, the second-level braking action, and whether to put in the first-level braking action to complete a series of safety systems. Judgment and execution of actions.

(3) The constant deceleration cabinet comes with an uninterrupted power supply to maintain a series of executive functions such as PLC, detection components, hydraulic system valves, and alarms in the event of a safety failure; perceive all the sensors provided by the constant deceleration hydraulic station and the hoist mechanical system Signal and react to it.

(4) Responsible for exchanging control information with operation console and depth indicating device under normal working conditions, safe braking conditions, emergency braking conditions.

(5) With touch screen man-machine dialogue function, query various operating records and history curves.

(6) It has the function of self-diagnosis and inspection of the constant deceleration hydraulic system, so that the hydraulic brake system can be in a normal working state.

(7) The constant deceleration control cabinet is designed with two sets of systems, so that it can be repaired and maintained without stopping production, achieving one use and one preparation

Selection parameters of constant deceleration hydraulic system