Quality appraisal of wood polishing machine

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wood grinder takes the synergy of high-torque grinding and wood fiber control as its core principle. By optimizing the cutterhead speed, feed pressure and tool wear resistance, it achieves the synergy of wood crushing particle size, processing efficiency and energy consumption control. It is widely used in papermaking wood pulp preparation, biomass fuel production, furniture waste recycling and artificial board raw material processing. In the pulping industry, it is used for fiber separation and homogenization of logs; in the field of biomass power generation, it meets the standardized production needs of sawdust fuel; in wood recycling, it ensures the efficient crushing and resource utilization of waste furniture. Compared with traditional crushing equipment, wood grinders have the characteristics of long tool life, excellent dust suppression and intelligent adjustment. They are the core equipment for wood resource utilization.

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

With the upgrade of environmental protection requirements for wood processing, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: processing capacity is not up to standard, wood chip particle size exceeds standard;

2, material defects: insufficient carbon content of blade base material, shrinkage and porosity of bearing seat casting;

3, process problems: spindle dynamic balance deviation, hydraulic system leakage rate;

4, contract performance dispute: key configurations (such as imported tool coating technology, intelligent dust removal module) are inconsistent with the technical agreement.

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Wood grinding machine quality appraisal technical methods mainly include:

1. Appearance inspection: Check the overall appearance of the wood grinding machine, including the body, guard, operating panel and other components, whether there is damage, rust or other defects.

2. Functional test: Carry out actual processing test on the wood grinding machine to check whether its processing accuracy, processing efficiency and processing quality meet the requirements.

3. Component testing: Test key components of the wood grinder, such as motors, bearings, grinding heads, etc., to check whether their performance, accuracy and reliability meet standards.

4. Material analysis: Analyze the materials used in the wood grinder to check whether the materials meet the standards and whether there are defects or contamination.

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A paper mill of the applicant signed a "Disc Wood Mill Purchase Contract" with an equipment manufacturer of the respondent, and it was agreed that the wood pulp fiber qualification rate was ≥95%. After being put into production, the coarse fiber residue rate exceeded 30%. The manufacturer argued that it was caused by the high moisture content of the wood.

Identification analysis results:

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

The cutter head speed of the wood grinder involved in the case is only 2500rpm (agreement ≥3000rpm), and the tool hardness is HRC 52 (agreement ≥58); the radial runout of the spindle is 0.15mm (agreement ≤0.05mm), resulting in uneven fiber tearing.

The appraisal conclusion concluded that equipment power system and material defects are the main causes of fiber quality.

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Wood grinding machine quality appraisal report should include:

1, appraisal purpose (such as attribution of performance disputes, environmental compliance verification) and reference standards;

2, involved equipment model, tool batch, production record;

3, testing method and equipment list (such as laser Optical particle size analyzer, vibration analyzer);

4, correlation analysis between detection data and failure (such as the impact of rotational speed on fiber separation);

05, clarify the conclusion and technical basis for quality responsibility determination;

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26, signature of the appraiser, forestry mechanical engineer qualification certificate and official seal of the organization.

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