Document Number:BBK-DVP-2026-101

Preparation Department:Production Technology Department

Prepared Date:January 2026

Effective Date:January 2026

Scope of application:Daily maintenance, inspection, and emergency handling of nitrogen gas springs for all production equipment of BBK-JINGBA GOTEBO KOFUO

catalogue

1. General Provisions

2. Daily inspection and regular maintenance standards

3. Daily Inspection Record of Nitrogen Spring

4. Fault emergency response quick check card

5. Safety Management Supplementary Provisions

1. General Provisions

1.1 Purpose of Preparation

In order to standardize the maintenance work of the company's nitrogen gas springs, ensure their operational stability and service life, reduce equipment failure and shutdown rates, and ensure production safety and product accuracy, this manual is specially formulated.

1.2 Applicable equipment

This manual is applicable to various standards and customized nitrogen gas springs used in the company's mold production, hardware processing, and other processes.

1.3 Core Principles

-Prevention oriented: Adhere to the combination of daily inspections and regular in-depth maintenance, and identify hidden dangers in advance.

-Professional operation: Work involving high-pressure inflation, seal replacement, disassembly and maintenance must be carried out by professionals or manufacturers.

-Safety first: Strictly abide by the operating specifications of high-voltage components and prevent safety accidents caused by illegal operations.

2. Daily inspection and regular maintenance standards

2.1 Inspection cycle

2.2 Core Inspection Items and Judgment Criteria

2.2.1 Appearance and sealing inspection

Inspection content: Check whether there are scratches, deformations, rust on the surface of the cylinder body, piston rod, and seals, and whether there are signs of oil or gas leakage.

Judgment criteria: It is normal for the surface to be smooth and undamaged, and for the sealing area to have no oil stains or air bubbles leaking.

2.2.2 Pressure and stroke inspection (measured by professional equipment)

Inspection content: Use a dedicated pressure gauge to detect the initial inflation pressure; Empty load test for full range operation status.

Judgment criteria: The error between the pressure value and the value indicated on the product nameplate is ≤± 5%; It is normal for the travel to be smooth without any lag, abnormal noise, or insufficient travel.

2.2.3 Attachment Inspection

Inspection content: degree of wear of guide sleeve, tightness of installation bolts, and integrity of limit device function.

Judgment criteria: The bolt is not loose and there is no sliding wire; The sensitivity of the limit device is considered normal.

2.2.4 Environmental and working condition inspection

Inspection content: Check whether the operating environment temperature, cleanliness, and the direction of force on the nitrogen gas spring are consistent with the axis.

Judgment criteria: The ambient temperature is within the range of -20 ℃ to 80 ℃; No large amount of dust or corrosive media; No unbalanced load and normal lateral force.

2.3 Routine maintenance measures

Cleaning: Wipe the surface of the piston rod and cylinder body with a dust-free cloth daily to remove dust, iron filings, and other impurities; Install dust-proof and anti-corrosion protective covers under harsh working conditions.

Lubrication: During regular deep inspections, apply special high-temperature resistant grease to the joint between the piston rod and the guide sleeve, and it is strictly prohibited to use ordinary engine oil.

Recharge: When the pressure is lower than the standard value by ≥ 10%, use a dedicated inflation tool to replenish high-purity nitrogen gas. It is strictly prohibited to fill with air or mixed gases.

Replacement: If the wear of key components (seals, guide sleeves) exceeds the standard, or if the piston rod is deformed or the cylinder body is cracked, immediately replace it as a whole or send it to the factory for repair.

3. Daily Inspection Record of Nitrogen Spring

Equipment Number:____________________

Nitrogen spring model/nameplate pressure:____________________

Use workstation:____________________

Note:

1. The specific location and degree of abnormal items should be clearly stated in the "Abnormal Details Description", and the results should be indicated in the "Handling Measures" column after processing.

2. Regular in-depth inspections should be accompanied by pressure detection value records.

3. This form is in duplicate, with one copy retained by the production team and one copy filed by the technical department.

4. Fault emergency response quick check card

4.1 Emergency Response Table for Core Faults

4.2 Shorthand mnemonic for emergency response

Stop the machine if there is a leak, clean the lag first;

Oil leakage needs to be inspected, and if it exceeds the temperature limit, it should be cooled down first;

Unbalanced load adjustment installation, safety in mind.

5. Safety Management Supplementary Provisions

1. Operators must undergo nitrogen spring safety operation training and be familiar with the content of this manual before they can take up their posts.

2. High risk operations such as high-pressure inflation, disassembly and maintenance must be carried out by qualified professionals, and safety warning signs must be set up on site.

3. After the nitrogen gas spring reaches its design cycle life (usually one million cycles), regardless of whether the appearance is normal, it needs to be replaced as a whole, and it is prohibited to use it beyond the expiration date.

4. This manual is interpreted and revised by the Production Technology Department and shall be implemented from the effective date.