How to Use Hydraulic Tunneling Jumbo?

Table of Contents

The hydraulic tunneling jumbos is a rock drilling equipment widely used in underground projects such as tunnels, roadways, and other underground projects. It has the advantages of high efficiency, accuracy, and safety, which can significantly improve the efficiency and safety of rock drilling operations. It is also one of the indispensable equipment in mining engineering.

Classification of hydraulic tunneling jumbo

1. Hydraulic tunneling jumbos are divided into pneumatic and hydraulic according to the power.

2. According to the applicable roadway section, it is divided into five types: micro (<6㎡), small (6-20㎡), medium (10-50㎡), large (12-70㎡), and extra-large (18-150㎡).

3. According to the walking chassis, hydraulic tunneling jumbo is divided into four types: rail-wheel type, tire type, crawler type, and gantry type.

To optimize the working efficiency of hydraulic tunneling jumbos and ensure the personal safety of the operators, meticulous preparation is imperative before their utilization.

Preparation before use

  • Before entering the working surface, deal with loose stones and debris on the working surface, clean up the roadway, check whether the track installation meets the requirements, and the distance between the front end of track and the most concave part of rocks on the working surface should not be more than 2.5m.
  • Turn on the power and drive drill jumbo to the working surface, then use rail to fix drill jumbo in the proper position, the front wheel axis is not more than 2.5m from the working surface or make the top of the slide frame not more than 0.5m from the working surface.
  • Check whether oil tank storage is sufficient. If oil level is lower than indicated scale, the qualified hydraulic oil should be replenished in time.
  • Each lubrication part should be filled with lubricating oil, to prevent friction parts from burning out because of not filling oil in time.
  • Connect the gas and water pipes. When connecting gas pipes, you should send gas to blow clean debris such as mud and sand in the pipe to avoid damaging the pneumatic equipment.
  • Prepare drill rods, rock drill bits, necessary tools, and wearing parts.
  • Before rock drilling, conduct a trial run of the hydraulic tunneling jumbo. Check whether the parts of each department are intact and whether the fastening parts are loose. Screws on each motor coupling and the two tie rod nuts of drill jumbo must not have any loose phenomenon. Check whether there is any leakage in the gas, water, and oil circuit system, and if there is any abnormality, it should be dealt with before starting production.
  • Connect the lighting.
hydraulic tunneling jumbo

How to use hydraulic tunneling jumbo?

  • Drill jumbo operator must be familiar with the role and position of each operation valve, to operate drill jumbo accurately.
  • Strictly follow the operation sequence of pump opening, lifts, pendulum supports, jack supports cobalt openings, and closing pumps (except booster pumps).
  • To ensure that the slide frame is always tightened to the working surface when drilling, the control handle of cylinder (oil cylinder) is always triggered to the forward position, for the drilling carriage with oil cylinder should also make the oil pump motor control to run at low speed to input a small amount of hydraulic oil to make up for the leakage of cylinder.
  • Regulator for piston-type pneumatic motor should be adjusted so that the working pressure of the oil is at 5.5MPa. In general, do not trigger the air valve handle. However, when air pressure is insufficient, you can increase the amount of air. After air pressure is increased, return the air to the normal value. Do not adjust the valve to the maximum position and ignore it, not only wastes pressure gas but also makes the pressure oil do a useless cycle, to the oil temperature increases and damages the high-pressure oil pipe.
  • Before each hole is drilled, the hole position and direction must be accurately found, and the orientation should not be adjusted at will during drilling to avoid accidents of stuck and broken drills.
  • When drill is stuck, turn off gas (oil) source of propulsion and pull out drill rod with the propulsion cylinder while knocking the rod with a hammer, and do not pull out drill rod with the compensation cylinder.
  • During rock drilling operations, always pay attention to whether the connection between stabilizer device and various parts is firm and whether the oil temperature and pressure are too high.
  • During the operation of drill jumbo, oil should be injected into each oil injection part at any time. Running parts such as propulsion air motor, rock drill, pallet, screw, and drill arm should be oiled more than twice a shift.
  • When swinging drill arm and slide frame, make sure to return the slide frame so that tip leaves the working surface. Movement of drill arm shift must be accurate and be careful not to make the two drill arms touch violently.
  • When drill jumbo is working, it is strictly forbidden to stand around drill jumbo and under drill arm to prevent people from being bruised or crushed.
  • After rock drilling operation is finished, the two arms are gathered together, slide frame is returned and is in a horizontal position, gas hose is organized, and all parts of drill jumbo are blown and cleaned (pay attention to prevent water and dirt from entering the tank), then drill rod is withdrawn from the working surface and parked in a safe place to avoid damage from flying stones and loose stones falling when the gun is released.
  • When using a locomotive to pull drill jumbo for long-distance operation, the walking handle should be put into neutral position to reduce the driving resistance.
  • After stopping rock drilling, the operator must disconnect the switch on the drilling rig and the switch of the main power supply when leaving the drilling rig avoid oil leakage and electricity leakage, etc.

Precautions when using hydraulic tunneling jumbos

  • Operators must undergo professional training and assessment and master the correct use of equipment and safe operating procedures.
  • During operation, the operator should always pay attention to the operating status and sound of the equipment. If any abnormalities are found, stop the machine immediately for inspection.
  • During the construction process, operators must wear labor protective equipment, such as helmets, protective clothing, gloves, and so on. In addition, warning signs and safe passages should be set up at the construction site to ensure the safety of workers and equipment.
  • When moving the equipment, it needs to be fixed to prevent it from moving or tipping.
  • During the drilling process, the operator should always pay attention to the temperature and wear of the drill bit. If any abnormalities are found, replace or repair them in time.

Maintenance of hydraulic tunneling jumbos

To maintain the good operating condition and service life of the hydraulic tunneling jumbos, regular maintenance is required.

  • Clean the surface and internal parts of the equipment to remove dust and debris.
  • Check whether the fasteners are loose. If there are any problems, tighten or replace them in time.
  • Check whether the oil volume, pressure, and flow of the oil tank and hydraulic system are proper. If there are any deficiencies, they should be replenished and repaired in time.
  • Check whether parts such as rock drill bits and drill rods are worn or damaged. If there are any problems, they should be replaced or repaired in time.
  • Conduct comprehensive inspections and maintenance of the equipment regularly to ensure the proper operating status and service life of the equipment.

In general, hydraulic tunneling jumbos is one of the indispensable pieces of equipment in underground engineering. Proper use of hydraulic tunneling jumbos can significantly improve the efficiency and safety of rock drilling operations. During use, the operator should always pay attention to the operating status and sound of the equipment and should stop the machine in time to check the abnormality. At the same time, regular equipment maintenance can maintain the good operating condition and service life of the equipment. When encountering a problem, you should first determine the cause of the problem and then take appropriate measures to repair it.

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