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Why hydraulic breaker need nitrogen and how to charge?

Views: 939     Author: Site Editor     Publish Time: 30-03-2023      Origin: Site

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Regularly charging nitrogen is a common practice for excavator operators who frequently utilize hydraulic breakers. However, a lack of knowledge regarding the appropriate amount of nitrogen to add is prevalent among many operators. Today, we'll delve into determining the correct quantity of nitrogen needed and the proper procedure for its addition.



Why Nitrogen Charging Matters for Hydraulic Breakers?

When discussing nitrogen's role, a crucial component takes the spotlight: the accumulator. Filled with nitrogen, the accumulator serves to store the residual energy from the hydraulic breaker's prior impact and the recoil of the piston. This stored energy is then released simultaneously during the subsequent impact, amplifying the striking force. Essentially, nitrogen's impact lies in augmenting the striking energy, thereby directly influencing the hydraulic breaker's performance based on the quantity of nitrogen employed.


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What's the Recommended Quantity of Nitrogen for Addition?

Many excavator operators are concerned about the ideal nitrogen quantity. As more nitrogen goes in, the accumulator pressure increases. Optimal working pressure for accumulators differs based on the hydraulic breaker model and external factors. Typically, it should hover around 1.4-1.6 MPa (roughly 14-16 kg), but this can vary.



How does hydraulic pulverizers improve work efficiency?

Driven by a hydraulic cylinder, hydraulic pulverize achieves the purpose of crushing objects by controlling the angle between the movable jaw and the fixed jaw. Jiangtu hydraulic pulverizer uses the speed-increasing valve to hydraulically return the oil in the rod cavity of the oil cylinder to the rodless cavity and then increase the speed when the hydraulic cylinder extends outwards, reducing time spent on empty stroke. While keeping the thrust of the oil cylinder unchanged, the operating speed of the oil cylinder is increased and then the working efficiency of hydraulic pulverizer is improved.

The oil cylinder is designed to be installed upside down, which avoids bumps and scratches on the piston rod.


What are the Consequences of a Nitrogen Deficiency?

Insufficient nitrogen leads to reduced accumulator pressure, resulting in weaker striking force. Damaged diaphragms require complex and costly whole-unit disassembly during maintenance. Thus, it's crucial to charge nitrogen to the specified pressure to avoid these issues.


How does an excess of nitrogen impact hydraulic breaker performance?

Is increasing nitrogen always a beneficial solution?

Adding excessive nitrogen results in heightened accumulator pressure. Consequently, the hydraulic oil pressure becomes insufficient to push the cylinder rod upward for nitrogen compression. This renders the accumulator incapable of storing energy, causing the hydraulic breaker to malfunction.


What's the Procedure for Nitrogen Charging?

Here are the instructions for charging nitrogen:

1. Attach the pressure gauge to the three-way valve and turn the valve handle counterclockwise.

2. Connect the hose to the nitrogen cylinder.

3. Remove the screw plug from the breaker and install the three-way valve on the charging valve of the cylinder, ensuring the O-ring is in place.

4. Connect the other end of the hose to the three-way valve.

5. Turn the nitrogen cylinder valve counterclockwise to release nitrogen gas (N2). Slowly turn the three-way valve handle clockwise to reach the specified set pressure.

6. Turn the three-way valve counterclockwise to close, then close the valve handle on the nitrogen bottle by turning it clockwise.

7. After removing the hose from the three-way valve, ensure the valve is closed.

8. Turn the three-way valve handle clockwise to recheck the cylinder pressure.

9. Remove the hose from the three-way valve.

10. Securely install the three-way valve on the charge valve.

11. When turning the three-way valve handle clockwise, the pressure value in the cylinder will display on the pressure gauge.

12. If the nitrogen pressure is low, repeat steps 1 to 8 until reaching the specified pressure.

13. If the pressure is too high, slowly turn the regulator on the three-way valve counterclockwise to discharge nitrogen from the cylinder. Close it clockwise once the pressure is at the proper level. High pressure may cause the hydraulic breaker to malfunction. Ensure the pressure stays within the specified range and that the O-ring is correctly installed on the three-way valve.

14. Follow the "turn left | turn right" instructions as needed.

Important Note: Before commencing operation, ensure that newly installed or repaired hydraulic breakers are charged with nitrogen, maintaining a pressure of 2.5, ±0.5MPa. If the hydraulic breaker will be inactive for an extended period, it's crucial to release the nitrogen and seal the oil inlet and outlet ports. Avoid storing it in high-temperature conditions or environments below -20 degrees Celsius.


Hence, insufficient or excessive nitrogen both impede its normal functioning. While charging nitrogen, it's vital to employ a pressure gauge to regulate the accumulator pressure within the optimal range. Adjustments based on actual working conditions not only safeguard the components but also enhance overall work efficiency.


Should you have any inquiries regarding hydraulic breakers or other excavator attachments, please don't hesitate to reach out to us anytime.


RAY Attachments' Excavator Breaker utilizes specialized carbon steel and undergoes heat treatment processes. This ensures minimal wear on the piston hitting surface while maximizing the piston's lifespan.


Precision tolerance control is employed in piston production to enable easy replacement of the piston and cylinder as a single unit, effectively lowering maintenance expenses.


The breaker housing demands an increasingly stringent sealing system. Thanks to NOK brand oil seals, our hydraulic breaker guarantees minimal (zero) leakage, along with reduced friction and wear, ensuring an extended service life.


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