Application and technical points of jaw crusher in water conservancy and hydropower engineering

As an important component of national infrastructure construction, water conservancy and hydropower projects require the handling of a large amount of stone materials during the construction process, including excavated rocks, preparation of concrete aggregates, and recycling of waste building materials. Jaw crusher has become one of the indispensable key equipment in water conservancy and hydropower engineering due to its simple structure, high crushing efficiency, and strong adaptability. This article will analyze in detail the practical application of jaw crushers in water conservancy and hydropower engineering from the aspects of working principle, selection and configuration, construction scenario application, and maintenance management.

1、 Working principle and performance advantages of jaw crusher

The jaw crusher achieves material crushing through periodic squeezing motion between the moving jaw and the fixed jaw. Its core components include the frame, movable jaw plate, fixed jaw plate, eccentric shaft, and adjustment device. During operation, the motor drives the eccentric shaft to rotate, driving the moving jaw to perform reciprocating motion. The material is squeezed, split, and broken between the two jaw plates, ultimately achieving the desired particle size.

In water conservancy and hydropower engineering, the advantages of jaw crushers are mainly reflected in the following aspects:

1. High crushing ratio: The primary crushing stage can process large rocks with a particle size of up to 1.5 meters, and the discharge particle size can be adjusted to meet the requirements of subsequent processes.

2. Sturdy structure: Suitable for high hardness materials such as granite and basalt, and can adapt to harsh construction environments.

3. Convenient maintenance: Modular design makes it easy to replace vulnerable parts (such as jaw plates) and reduces downtime.

4. Energy saving and environmental protection: The new hydraulic regulation and lubrication system reduces energy consumption, and some models are equipped with dust removal devices, which meet the requirements of green construction.

2、 Typical application scenarios in water conservancy and hydropower engineering

1. Aggregate processing production line

The demand for concrete in hydraulic engineering is huge, and it is necessary to crush the natural stone or tunnel excavation materials into aggregates of different specifications. Jaw crushers are usually used as primary crushing equipment, forming a joint production line with cone crushers, sand making machines, etc. For example, a certain hydropower project uses PE1200 × 1500 jaw crusher as the head crusher to crush the raw material to below 250mm, and then produces 5-40mm concrete aggregates after secondary crushing and screening, with a daily processing capacity of 3000 tons.

2. Treatment of excavation materials for cofferdam and dam foundation

In dam construction, excavated waste rocks can be crushed on-site by jaw crushers and backfilled or used as roadbed materials. For example, the Three Gorges Project once used mobile jaw crusher units to instantly crush excavated materials, reducing transportation costs and achieving resource recycling.

3. Crushing of tunnel excavation slag and stones

The slag generated during the construction of hydroelectric tunnels often contains impurities such as steel bars. The strong impact resistance of the jaw crusher enables it to handle such mixed materials, and the crushed slag can be used for backfilling or making blocks. Some projects also use a combination of "jaw crusher+magnetic separator" to separate metal impurities and improve the purity of aggregates.

4. Emergency rescue and post disaster reconstruction

In the dredging of barrier lakes or dam repair projects, mobile jaw breaking units can be quickly deployed to break and clean obstacles. Its flexibility and efficiency were outstanding in the rescue of a flood in 2020, and it only took 48 hours to clear the blocked flood discharge channel.

3、 Technical points for selection and configuration

1. Model matching: Select equipment based on project scale and material characteristics. Large hydropower projects (such as Baihetan Hydropower Station) often use JC series European version jaw crushers, whose hydraulic wedge adjustment device can quickly respond to different crushing needs; Small and medium-sized projects can choose PE or PEX series, balancing cost and efficiency.

2. Mobile and fixed options: Fixed crushing stations are suitable for long-term aggregate production, while mobile jaw crushers (such as the tracked MC series) are more suitable for frequent excavation material handling.

3. Upgrade of wear-resistant materials: Although high manganese steel jaw plates have low cost, their service life is short. It is recommended to use tungsten titanium alloy composite jaw plates for hydropower projects, which can extend their service life by 2-3 times.

4. Automation control: The intelligent jaw crusher integrated with PLC system can monitor bearing temperature, lubrication pressure and other parameters in real time to prevent equipment overload faults.

4、 Common problems and solutions during construction

1. Blockage of viscous materials:

Phenomenon: Materials with high mud content are prone to adhere to the crushing chamber.

Countermeasure: Pre screen or install high-pressure water flushing devices, and if necessary, use deep cavity jaw crushers to enhance discharge capacity.

2. Equipment foundation settlement:

Case: A certain project caused the jaw to break and the frame to shift due to unstable foundation.

Preventive measures: When pouring reinforced concrete foundation, it is necessary to achieve the designed compressive strength and regularly check the tightness of the anchor bolts.

3. Damage to iron components:

Risk point: Metal debris such as steel bars and drill bits entering the crushing chamber.

Improvement plan: Install a metal detector or iron remover at the feed inlet, and activate the hydraulic overload protection system in emergency situations.

5、 Maintenance and Safety Standards

1. Lubrication management:

Lubricate the bearings with high-temperature lithium grease, check the oil level every 8 hours, and add waterproof measures during rainy season construction.

2. Monitoring of vulnerable parts:

When the jaw plate wears down to 70% of its original thickness, it must be replaced to avoid a decrease in crushing efficiency.

3. Safe operation:

It is strictly prohibited to adjust the discharge port or clean the stuck material manually during operation, and the "power-off hanging" system must be followed.

6、 Future Development Trends

With the development of intelligent and low-carbon water conservancy and hydropower engineering, jaw crusher technology is also continuously upgrading.

New energy power: Electric and hybrid models are gradually replacing diesel drive to reduce carbon emissions.

Digital twin technology: Real time transmission of device status to BIM platform through sensors to achieve predictive maintenance.

Ultra fine crushing technology: The jaw crusher based on the new laminated crushing principle can produce fine materials below 3mm, which can be directly used for the construction of roller compacted concrete (RCC) dams.

Conclusion: The application of jaw crushers in water conservancy and hydropower projects not only improves construction efficiency, but also promotes efficient utilization of resources and environmental protection. In the future, through the combination of technological innovation and refined management, this traditional equipment will continue to provide reliable support for major water conservancy construction projects.