Quality appraisal of road brick machine

road tile machine uses vibration pressurization and mold forming as its core principles, and achieves large-scale production of pavement tiles through concrete spreading, high-frequency vibration and molding processes. Its typical application scenarios include: municipal road paving, garden landscape construction, parking lot hardening projects, etc. Compared with traditional hand-made bricks, road tile machines have the characteristics of high automation, high precision, and low energy consumption, and are key equipment for the construction of modern urban infrastructure.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide quality appraisal services for road tile machines. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for the quality appraisal of road tile machines.

With the acceleration of urbanization, the number of quality disputes involving road tile machines has gradually increased. The judicial dispute focuses on:

1. Disputes over performance indicators: whether the compressive strength of the product meets the standard and whether the dimensional deviation meets the design value;

2. Material and process defects: insufficient wear resistance of the mold material, frequency of vibration Improper rate control leads to honeycomb pitting;

3. Control system failure: poor uniformity of cloth and unreasonable demoulding time setting lead to cracking of products;

4. Contract performance issues: delivered equipment does not match the technical agreement.

Road tile machine quality appraisal technical methods mainly include:

1. Appearance inspection: Check the overall appearance of the tile machine for defects such as deformation, cracks, abnormal wear and tear.

2. Dimensional measurement: Measure the key dimensions of the tile machine, such as frame size, platen size, etc., to verify whether it meets the design requirements.

3. Functional test: simulate the actual production environment and test the functions and performance of the tile machine, such as molding pressure, molding speed, finished product size, etc.

4. Material analysis: Conduct composition and performance analysis of the key materials of the tile machine, such as steel strength, wear resistance, etc.

The applicant, a municipal engineering company, and the respondent, a machinery company, signed a "Purchase Contract for Road Tile Machines", agreeing to purchase 3 units of equipment with model number HZJ-600. After being put into production, the compressive strength of the tiles was only 25MPa (contract requirement C30), and the fracture rate exceeded 10%. The engineering company believed that the equipment had quality defects and demanded compensation for losses. The machinery company argued that the problem was caused by improper concrete proportions, and both parties went to court.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of the "road tile machine", contract technical agreement, on-site investigation case materials and other data, and made the following quality analysis opinions:

The mold material of the road tile machine involved in the case is HT200 gray cast iron (contract requirements) QT500-7), the elongation is only 2%, and the wear resistance is insufficient; the vibration motor bearing material is ordinary carbon steel (stainless steel is required by the contract), and corrosion causes frequency fluctuations. The vibration time is only 20 seconds (standard 30 seconds), and the density of the concrete is insufficient; the release agent is unevenly applied, resulting in more than 5% of the honeycomb area on the surface of the product.

The machinery company failed to provide the specified material mold and vibration motor according to the contract, and the process parameter control was not up to standard, which was the main reason for the equipment problems.

Road tile machine quality appraisal report should include the following content:

1. The purpose and basis of the appraisal.

2. Model, specification, manufacturer and other information of the equipment being identified.

3. Identification method.

4. Identification results (including whether there are quality problems, causes of problems, etc.).