Method and system for quickly judging main quality problem of electric tool

Abstract

The invention belongs to the technical field of quality problem judgment, and discloses a rapid judgment method for main quality problems existing in an electric tool, and the main quality problems existing in the electric tool specifically comprise the problems existing in a power plug; problems existing in power supply connection and external connection of flexible wires are solved; the problem of electromagnetic compatibility is solved; the problem of electrical strength; the problems of a flexible wire fixing device are solved; the problems of a wiring terminal of an external wire are solved; problems exist in internal wiring; the grounding problem is solved; and existing problems are marked. According to the method, main quality problems of the electric tool are effectively identified, different rapid judgment methods are provided for different quality problems, corresponding solutions can be conveniently taken, the quality problems can be solved in time, economic losses are reduced, and serious potential safety hazards are avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of quality problem determination, and in particular relates to a method and system for quickly determining main quality problems existing in electric tools. Background Art

[0002] 80% of the large amount of power tools consumed worldwide each year are produced and exported by Chinese companies, and many of the parts of the remaining 20% ​​of power tools produced by foreign power tool companies are also produced and exported by Chinese companies. To meet such a huge market demand, power tool and parts manufacturers are required to strictly control quality.

[0003] Although the country has implemented "3C" certification for power tools for many years, some companies cannot organize production according to national standards; some foreign-related companies, due to many reasons such as sluggish overseas markets and lax freight management, mistakenly put export products that do not meet the circulation requirements of the domestic market into the domestic market for circulation and sales. This leads to substandard performance of power tools and even safety hazards. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a method for quickly determining the main quality problems existing in electric tools. The main categories of quality problems that can be quickly determined specifically include:

[0005] (1) Problems with the power plug;

[0006] (2) Problems with power connection and external flexible cables;

[0007] (3) Problems with electromagnetic compatibility;

[0008] (4) Problems with electrical strength;

[0009] (5) Problems with cord fixing devices;

[0010] (6) Problems with the wiring terminals for external wires;

[0011] (7) Problems with internal wiring;

[0012] (8) Grounding problems;

[0013] (9) Problems with the logo.

[0014] The present invention is implemented as follows: a method for quickly determining the main quality problems of an electric tool, characterized in that the method is used to quickly determine the main problems of the electric tool. Examples include:

[0015] Furthermore, the problems with the power plug are as follows:

[0016] Some companies cut corners and produce shoddy products, causing the structural dimensions of their power tool power plugs to fail to comply with Article 24.1 of GB4706.1-2005 "Safety of Household and Similar Electrical Appliances Part 1: General Requirements" and GB 1002-1996 "Types, Basic Parameters and Dimensions of Single-Phase Plugs and Sockets for Household and Similar Purposes", which can easily lead to safety accidents.

[0017] Furthermore, the problems with the power connection and external flexible wire are as follows:

[0018] a. Article 24.4 of GB 3883.1 "Safety of Hand-held Electric Tools Part 1: General Requirements" stipulates that the lightest cable used for the power cord should have a cross-sectional area of ​​not less than 0.75mm 2 , GB 5013.4 245IEC53 (YZ) ordinary strength rubber sheathed wire soft, or the cross-sectional area should be not less than 0.75mm 2 , GB 5033.5 227IEC53 PVC sheathed wire, and some unqualified products have a measured cross-sectional area of ​​0.65mm 2 、0.63mm 2 , 0.50mm 2 , some are even smaller, and some even use aluminum core wires to impersonate copper wires;

[0019] b. Article 24.4 of the new electric hammer standard GB 3883.7 stipulates that the lightest cable used for the power cord is heavy-duty chloroprene rubber cable, i.e. 245IEC66 (YCW) cable of GB 5013.4, with a cross-sectional area of ​​at least 1.0mm 2 .. Some electric hammers still follow the old standard GB 3833.7-1991 Article 23.3: The power cord uses ordinary chloroprene rubber sheathed soft cable, that is, GB5013.4 245IEC57 (YCW) cable with a cross-sectional area of ​​0.75mm2, and some use polyvinyl chloride cable instead of rubber cable;

[0020] c. Article 23.3 of GB 3883.18 "Safety of Hand-held Electric Tools Part 2: Special Requirements for Electric Stone Cutting Machines" stipulates that the lightest cable used for the power cord is ordinary chloroprene rubber sheathed soft cable, that is, 245IEC57 (YCW) of GB 5013.4, with a cross-sectional area of ​​0.75mm 2 Some use polyvinyl chloride cables instead of rubber cables;

[0021] The nominal cross-sectional area of ​​the power cord is too small or the use of aluminum core wire will cause the resistance of the wire to be too large, causing the power tool to overheat; using polyvinyl chloride cable instead of rubber cable will reduce the strength of the cable, causing power cord leakage and other phenomena, bringing potential dangers to the user's life and property safety;

[0022] Furthermore, the electromagnetic compatibility problems are as follows: the method for eliminating electromagnetic interference in electric tools is usually to install an electrical filter device; common electrical filters are composed of a filter capacitor device and a filter inductor, and there are also filters composed of a single filter capacitor; currently, some electric tools do not have an electrical filter device at the power input switch, which causes the power terminal interference voltage and interference power, as well as harmonic current to exceed the standard when the electric tools are tested for electromagnetic compatibility in accordance with GB 4343.1 and GB 17625.1 standards;

[0023] Furthermore, the electrical strength problem is as follows: According to the national mandatory standard GB 3883.1 electrical strength requirements: the live windings and exposed metal parts of Class II electric tools must withstand a withstand voltage test of 50Hz 3750V for 1min. However, some companies cut corners and produce Class II electric tools with no insulation isolation measures between the exposed metal chuck and its motor rotor core (direct connection), and only basic insulation between the motor rotor core and the motor winding, resulting in the electrical strength of many electric tools failing to meet the national mandatory standard requirements.

[0024] Furthermore, the problems with the cord fixing device are as follows: at least one of the parts of the cord fixing device is firmly fixed to the power tool, unless it is a part of a specially prepared cord. If the cord is not properly fixed, it may be pulled and worn, and damaged wires may cause leakage and be dangerous. Some companies use sealing glands as cord fixing devices, while others tie a knot in the cord instead of a fixing device. These practices may cause the power cord to be pulled inside the power tool, which is expressly prohibited by the standard.

[0025] Furthermore, the problems with the wiring terminals of the external wires are as follows: some wires are damaged to varying degrees at the clamping points of the terminals, some wires are not protected by copper foil, some wires are twisted and inserted into the wiring holes, and some wires are directly inserted into the wiring holes, and the wiring terminals directly break the insulation layer of the wires to reach the passage. These measures can easily damage the wires, which may cause the risk of circuit breaking, resulting in the inability of the power tool to start normally, and even causing leakage of the power tool, endangering the personal safety of the operator;

[0026] Furthermore, the problems existing in the internal wiring are as follows: according to GB 3883.1 "Safety of Hand-held Electric Tools Part 1: General Requirements", "when a bushing is used as additional insulation for internal wiring, reliable measures should be taken to keep the bushing in its proper position"; if the bushing cannot be kept in its proper position, it cannot play the role of additional insulation, thereby reducing the electrical clearance of the electric tool to below the specified value, resulting in leakage hazard;

[0027] Furthermore, the problems with grounding are as follows: since electric tools are frequently used and may come into contact with conductive media (such as dust, etc.), from the perspective of personal safety, higher safety performance requirements are placed on electric tools;

[0028] The specific problems with the logo are: unclear markings on electric tools cause great inconvenience to consumers when using such products. More seriously, missing or non-standard markings may cause misoperation.

[0029] Another object of the present invention is to provide a method for quickly determining the main quality problems of the electric tool, the method specifically comprising:

[0030] S1: For the problems with the power plug, according to the requirements of GB 1002 "Types, basic parameters and dimensions of single-phase plugs and sockets for household and similar purposes", use a vernier caliper or micrometer to test. If any indicator of the test result exceeds the requirements of the following table, it can be preliminarily determined that the product quality is unqualified;

[0031] S2: For problems with power connection and external soft wire, use a micrometer to measure the wire area; use an electronic scale and ruler to measure the actual area of ​​the wire; use a lighter to measure the melting point of the wire to determine the material; use a bridge or DC resistance meter to measure the resistance to determine whether it exceeds the standard;

[0032] S3: For the problems of electromagnetic compatibility, turn on the power input switch of the power tool and make a visual inspection; if there is no electrical filter device installed, samples should be sent to the statutory quality inspection agency for inspection;

[0033] S4: For the problem of electrical strength, use the capacitance range of FULUK17+ multimeter to measure the capacitance between the exposed metal chuck of the Class II electric tool and its motor input terminal (turn on its power switch), that is, the capacitance between the motor winding and the exposed metal parts. Usually, the exposed metal chuck of the Class II electric tool and its motor rotor core are insulated and isolated, and its capacitance is about 0.20nf. If its capacitance is about 1.00nf, it indicates that the exposed metal chuck of the Class II electric tool is directly connected to its motor rotor core, and it needs to be sent to the statutory quality inspection agency for insulation of its electrical strength.

[0034] S5: For problems with cord anchorages, the determination is based on at least one of the parts of the cord anchorage being securely fastened to the power tool, unless it is part of a specially prepared cord;

[0035] S6: For problems with the wiring terminals of external wires, the judgment is made according to the requirement of GB 3883.1-2005 standard that "the terminals should be able to clamp the wires but not damage them";

[0036] S7: For the grounding problem, make a judgment according to the requirement of GB 3883.1 standard: "Those easily accessible metal parts of Class I tools that may be energized in the event of insulation damage should be permanently and reliably connected to the grounding terminal or grounding wire connector inside the tool, or to the grounding pin of the tool inlet socket."

[0037] S8: Regarding the problems with the markings, according to GB 3883.1 "Safety of hand-held power tools Part 1: General requirements" and GB 3883.18, "The model, power type symbol, maximum cutting depth and maximum nominal diameter of the cutting disc should be marked on the power tool", which may even endanger the personal safety of the operator and can be judged by visual inspection or wiping with water.

[0038] In combination with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solutions to be protected by the present invention are as follows:

[0039] The present invention effectively identifies the main quality problems existing in the electric tool, provides different quick determination methods for different quality problems, and can also facilitate the adoption of corresponding solutions to solve the quality problems in a timely manner, reduce economic losses, and avoid serious safety hazards.

[0040] The technical solution of the present invention is mainly aimed at a method and system for quickly determining the quality problems of power tools. Traditional power tool detection methods usually rely on manual detection, which is time-consuming, low-precision, and easily affected by human factors, and cannot perform quality control in a systematic and standardized manner. In response to this problem of the prior art, the present invention proposes a fully automated and standardized quality problem determination system, which significantly improves the detection efficiency and accuracy.

[0041] The present invention adopts a modular detection method to automatically complete the quality inspection of key components such as power plugs, flexible cords, electromagnetic compatibility, electrical strength, grounding, and markings in steps, and uses precision measuring equipment such as vernier calipers, micrometers, electronic scales, and capacitance measuring instruments to achieve accurate collection of test data. Each module makes judgments based on different national standards, automatically compares the test results with standard requirements, and through systematic measuring equipment and data analysis, not only ensures the accuracy of the measurement, but also can identify products that do not meet national safety standards, thereby greatly reducing the risk of unqualified products entering the market.

[0042] In addition, the system solution of the present invention also has the function of result feedback and data recording, automatically generates test reports and stores them in the database, and provides data support for product quality improvement. In industrial applications, this solution realizes the full automation of the test process, improves the test efficiency, reduces the test cost, and significantly improves the reliability and consistency of the test quality through refined data analysis, which has a wide range of promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a flow chart of a method for quickly determining the main quality problems of an electric tool provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0045] The following is a detailed description of the working principle of the power tool quality problem rapid determination system provided by the present invention.

[0046] 1. Working principle of the power plug detection module: The power plug detection module is used to quickly evaluate whether the power plug of the power tool meets the requirements of the national standard GB 1002. The module contains precision measuring tools, such as vernier calipers or micrometers, which are used to measure the structural dimensions of the plug and compare the measured values ​​with the parameters in the standard. The system first places the plug under the caliper or micrometer for measurement, and determines whether it is within the standard tolerance range based on the read dimensional data. Once an indicator is found to be beyond the specified range of the standard, the system will determine that the plug has quality problems and mark it as a substandard product.

[0047] 2. Working principle of the soft wire detection module: The soft wire detection module uses a variety of measuring tools to detect the cross-sectional area, material and resistance of the power cord of the power tool. First, the system uses a micrometer to accurately measure the cross-sectional area of ​​the wire to ensure that it meets the minimum cross-sectional requirements of the GB 3883.1 standard. Then, use an electronic scale and ruler to further confirm whether the cross-sectional area of ​​the wire is consistent with the nominal value. At the same time, the melting point is detected by a lighter to confirm that the material is a copper core rather than an aluminum core. Finally, a bridge or DC resistance meter is used to measure the resistance value to determine whether its resistance exceeds the specified value. Exceeding the standard indicates that the power tool has a potential risk of overheating or leakage, which requires further investigation.

[0048] 3. Working principle of the electromagnetic compatibility detection module: This module is mainly used to detect whether an electrical filter device is installed at the power input switch of the power tool to meet the electromagnetic compatibility requirements. The system first turns on the power input switch and visually determines whether an electrical filter (usually a combination of capacitors and inductors) is installed. If there is no filter device, the system will automatically remind the operator and mark it as an item that requires further inspection. Such equipment may generate excessive electromagnetic interference, so the system will recommend that the tool be sent to a statutory quality inspection agency for a more comprehensive electromagnetic compatibility test.

[0049] 4. Working principle of the electrical strength detection module: The electrical strength detection module is used to verify whether the electrical insulation strength of the power tool meets the national standards. This module is equipped with the capacitance range of the FULUK17+ multimeter to evaluate the reliability of insulation isolation by measuring the capacitance between the exposed metal parts and the motor windings. If the capacitance value exceeds 0.20nF, it means that the exposed metal chuck is directly connected to the motor core and the insulation isolation is insufficient, which indicates that further testing is required to confirm whether its electrical strength meets the standards.

[0050] 5. Working principle of the terminal detection module: The terminal detection module is used to evaluate the protection and clamping force of the external wire of the power tool at the terminal clamping point. In accordance with the GB 3883.1 standard, the module uses a clamping force test device to check whether the terminal can effectively clamp the wire without damaging the wire. In operation, the system first inserts the wire into the terminal and performs a clamping test. If the wire is found to be damaged during the terminal clamping process, the system determines that the terminal design does not meet the standard and there is a safety hazard.

[0051] 6. Working principle of the ground connection detection module: The ground connection detection module is used to detect the reliability of the ground terminal of the power tool to ensure that the power tool meets the grounding requirements of the GB 3883.1 standard. The system is connected to the ground terminal of the power tool and verifies the continuity and reliability of the ground terminal through the current detection device. If the system detects that the ground terminal has poor contact or cannot achieve a stable connection, it will prompt a ground connection problem and mark it as a non-conforming item, requiring further repair or replacement.

[0052] 7. Working principle of the mark clarity detection module: The mark clarity detection module is mainly used to evaluate whether the marks on the power tool are clear, easy to read, and durable. The module consists of a visual inspection device and a water wiping component. The system automatically visually inspects the model, power type symbol, maximum cutting depth and other marks of the power tool, and then tests the durability of the mark by water wiping. If the mark fades or falls off during the test, the system will mark the tool as unqualified and prompt the operator to re-mark or replace the product.

[0053] 8. Test result feedback and recording function: The entire system also integrates the test result feedback and recording function. After all modules have completed the test, the system will automatically summarize the test data and generate a test report. The system will list the unqualified items separately and mark them in detail to remind the operator to deal with them in time. At the same time, the system will store the test results in the database for future tracking and quality improvement, thereby improving the overall safety and reliability of the power tool.

[0054] like Figure 1 As shown, an embodiment of the present invention provides a method for quickly determining the main quality problems of an electric tool, and the method specifically includes:

[0055] The main quality problems of the power tools that can be quickly identified include:

[0056] (1) Problems with the power plug;

[0057] (2) Problems with power connection and external flexible cables;

[0058] (3) Problems with electromagnetic compatibility;

[0059] (4) Problems with electrical strength;

[0060] (5) Problems with cord fixing devices;

[0061] (6) Problems with the wiring terminals for external wires;

[0062] (7) Problems with internal wiring;

[0063] (8) Grounding problems;

[0064] (9) Problems with the logo.

[0065] Furthermore, the problems with the power plug are as follows:

[0066] Some companies cut corners and produce shoddy products, causing the structural dimensions of their power tool power plugs to fail to comply with Article 24.1 of GB4706.1-2005 "Safety of Household and Similar Electrical Appliances Part 1: General Requirements" and GB 1002-1996 "Types, Basic Parameters and Dimensions of Single-Phase Plugs and Sockets for Household and Similar Purposes", which can easily lead to safety accidents.

[0067] Furthermore, the problems with the power connection and external flexible wire are as follows:

[0068] a. Article 24.4 of GB 3883.1 "Safety of Hand-held Electric Tools Part 1: General Requirements" stipulates that the lightest cable used for the power cord should have a cross-sectional area of ​​not less than 0.75mm 2 , GB 5013.4 245IEC53 (YZ) ordinary strength rubber sheathed wire soft, or the cross-sectional area should be not less than 0.75mm 2 , GB 5033.5 227IEC53 PVC sheathed wire, and some unqualified products have a measured cross-sectional area of ​​0.65mm 2 、0.63mm 2 , 0.50mm 2 , some are even smaller, and some even use aluminum core wires to impersonate copper wires;

[0069] b. Article 24.4 of the new electric hammer standard GB 3883.7 stipulates that the lightest cable used for the power cord is heavy-duty chloroprene rubber cable, i.e. 245IEC66 (YCW) cable of GB 5013.4, with a cross-sectional area of ​​at least 1.0mm 2 Some electric hammers still follow the old standard GB 3833.7-1991 Article 23.3: The power cord uses ordinary chloroprene rubber sheathed soft cable, that is, GB 5013.4 245IEC57 (YCW) cable with a cross-sectional area of ​​0.75mm2, and some use polyvinyl chloride cable instead of rubber cable;

[0070] c. Article 23.3 of GB 3883.18 "Safety of Hand-held Electric Tools Part 2: Special Requirements for Electric Stone Cutting Machines" stipulates that the lightest cable used for the power cord is ordinary chloroprene rubber sheathed soft cable, that is, 245IEC57 (YCW) of GB 5013.4, with a cross-sectional area of ​​0.75mm 2 Some use polyvinyl chloride cables instead of rubber cables;

[0071] The nominal cross-sectional area of ​​the power cord is too small or the use of aluminum core wire will cause the resistance of the wire to be too large, causing the power tool to overheat; using polyvinyl chloride cable instead of rubber cable will reduce the strength of the cable, causing power cord leakage and other phenomena, bringing potential dangers to the user's life and property safety;

[0072] Furthermore, the electromagnetic compatibility problems are as follows: the method for eliminating electromagnetic interference in electric tools is usually to install an electrical filter device; common electrical filters are composed of a filter capacitor device and a filter inductor, and there are also filters composed of a single filter capacitor; currently, some electric tools do not have an electrical filter device at the power input switch, which causes the power terminal interference voltage and interference power, as well as harmonic current to exceed the standard when the electric tools are tested for electromagnetic compatibility in accordance with GB 4343.1 and GB 17625.1 standards;

[0073] Furthermore, the electrical strength problem is as follows: According to the national mandatory standard GB 3883.1 electrical strength requirements: the live windings and exposed metal parts of Class II electric tools must withstand a withstand voltage test of 50Hz 3750V for 1min. However, some companies cut corners and produce Class II electric tools with no insulation isolation measures between the exposed metal chuck and its motor rotor core (direct connection), and only basic insulation between the motor rotor core and the motor winding, resulting in the electrical strength of many electric tools failing to meet the national mandatory standard requirements.

[0074] Furthermore, the problems with the cord fixing device are as follows: at least one of the parts of the cord fixing device is firmly fixed to the power tool, unless it is a part of a specially prepared cord. If the cord is not properly fixed, it may be pulled and worn, and damaged wires may cause leakage and be dangerous. Some companies use sealing glands as cord fixing devices, while others tie a knot in the cord instead of a fixing device. These practices may cause the power cord to be pulled inside the power tool, which is expressly prohibited by the standard.

[0075] Furthermore, the problems with the wiring terminals of the external wires are as follows: some wires are damaged to varying degrees at the clamping points of the terminals, some wires are not protected by copper foil, some wires are twisted and inserted into the wiring holes, and some wires are directly inserted into the wiring holes, and the wiring terminals directly break the insulation layer of the wires to reach the passage. These measures can easily damage the wires, which may cause the risk of circuit breaking, resulting in the inability of the power tool to start normally, and even causing leakage of the power tool, endangering the personal safety of the operator;

[0076] Furthermore, the problems existing in the internal wiring are as follows: according to GB3883.1 "Safety of Handheld Electric Tools Part 1: General Requirements", "when a bushing is used as additional insulation for internal wiring, reliable measures should be taken to keep the bushing in its proper position"; if the bushing cannot be kept in its proper position, it cannot play the role of additional insulation, thereby reducing the electrical clearance of the electric tool to below the specified value, resulting in a leakage hazard;

[0077] Furthermore, the problems with grounding are as follows: since electric tools are frequently used and may come into contact with conductive media (such as dust, etc.), from the perspective of personal safety, higher safety performance requirements are placed on electric tools;

[0078] The specific problems with the logo are: unclear markings on electric tools cause great inconvenience to consumers when using such products. More seriously, missing or non-standard markings may cause misoperation.

[0079] like Figure 1 As shown, the present invention applies a method for quickly determining the main quality problems of an electric tool to the main quality problems of the electric tool, and the method specifically includes:

[0080] S1: For the problems with the power plug, according to the requirements of GB 1002 "Types, basic parameters and dimensions of single-phase plugs and sockets for household and similar purposes", use a vernier caliper or micrometer to test. If any indicator of the test result exceeds the requirements of the following table, it can be preliminarily determined that the product quality is unqualified;

[0081] S2: For problems with power connection and external soft wire, use a micrometer to measure the wire area; use an electronic scale and ruler to measure the actual area of ​​the wire; use a lighter to measure the melting point of the wire to determine the material; use a bridge or DC resistance meter to measure the resistance to determine whether it exceeds the standard;

[0082] S3: For the problems of electromagnetic compatibility, turn on the power input switch of the power tool and make a visual inspection; if there is no electrical filter device installed, samples should be sent to the statutory quality inspection agency for inspection;

[0083] S4: For the problem of electrical strength, use the capacitance range of FULUK17+ multimeter to measure the capacitance between the exposed metal chuck of the Class II electric tool and its motor input terminal (turn on its power switch), that is, the capacitance between the motor winding and the exposed metal parts. Usually, the exposed metal chuck of the Class II electric tool and its motor rotor core are insulated and isolated, and its capacitance is about 0.20nf. If its capacitance is about 1.00nf, it indicates that the exposed metal chuck of the Class II electric tool is directly connected to its motor rotor core, and it needs to be sent to the statutory quality inspection agency for insulation of its electrical strength.

[0084] S5: For problems with cord anchorages, the determination is based on at least one of the parts of the cord anchorage being securely fastened to the power tool, unless it is part of a specially prepared cord;

[0085] S6: For problems with the wiring terminals of external wires, the judgment is made according to the requirement of GB 3883.1-2005 standard that "the terminals should be able to clamp the wires but not damage them";

[0086] S7: For the grounding problem, make a judgment according to the requirement of GB 3883.1 standard: "Those easily accessible metal parts of Class I tools that may be energized in the event of insulation damage should be permanently and reliably connected to the grounding terminal or grounding wire connector inside the tool, or to the grounding pin of the tool inlet socket."

[0087] S8: Regarding the problems with the markings, according to GB 3883.1 "Safety of hand-held power tools Part 1: General requirements" and GB 3883.18, "The model, power type symbol, maximum cutting depth and maximum nominal diameter of the cutting disc should be marked on the power tool", which may even endanger the personal safety of the operator and can be judged by visual inspection or wiping with water.

[0088] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. A system for quickly determining quality problems of electric tools, characterized in that: The system comprises: A power plug detection module, used to detect the structural dimensions of the power plug of the electric tool according to the GB 1002 standard, wherein the power plug detection module comprises a vernier caliper or a micrometer detection device, which can detect the key dimensional parameters of the power plug and preliminarily determine whether it meets the quality requirements; A cord detection module is used to measure the cross-sectional area, material and resistance of the power cord and external cord of the electric tool. The cord detection module includes a micrometer, an electronic scale, a ruler and a bridge or a DC resistance meter to confirm whether it meets the requirements of GB3883.1 standard; The electromagnetic compatibility detection module is used to detect whether an electrical filter device is installed at the power input switch of the power tool. If not, a prompt will be output and the device will be sent to a statutory quality inspection agency to test the electromagnetic compatibility performance; The electrical strength detection module, including the FULUK17+ multimeter capacitance range, is used to measure the capacitance between the exposed metal parts of Class II power tools and the motor windings to determine whether the electrical insulation isolation meets the mandatory standard requirements.

2. The power tool quality problem rapid determination system according to claim 1, characterized in that: The system further comprises: The terminal detection module is used to detect the clamping force and protection performance of the terminal of the external wire of the power tool. The module meets the requirement of "the terminal should be able to clamp the wire but not damage the wire" in the GB 3883.1 standard, and can detect whether the terminal clamping force meets the requirement and determine whether there is any damage to the wire.

3. The power tool quality problem rapid determination system according to claim 1, characterized in that: The system further comprises: The ground connection detection module is used to detect the reliability of the ground connection of the power tool. It complies with the requirements of GB 3883.1 standard and can detect whether the easily accessible metal parts in Class I tools are permanently and reliably connected to the ground terminal or ground wire connector to ensure the safety of the power tool.

4. The power tool quality problem rapid determination system according to claim 1, characterized in that: The system comprises: The mark clarity detection module is used to detect the clarity and wipe resistance of the power tool mark, which complies with the requirements of GB 3883.1 and GB 3883.18 standards. The mark clarity detection module includes a visual inspection device and a water wipe detection component, which is used to determine whether the markings of information such as the power tool model, power type, maximum cutting depth, etc. meet the quality requirements.

5. A method for quickly determining the main quality problems of electric tools, characterized in that: The method includes determining the following quality issues of power tools: The structural dimensions of the power plug; The cross-sectional area and material of the power connection and external flexible wires; Electromagnetic compatibility; Electrical strength; Reliability of cord anchorages; Clamping and protection of the terminal blocks for external wires; Supplementary insulation of internal wiring; Reliability of ground connection; The clarity and scratch resistance of the logo.

6. The method for quickly determining the main quality problems of an electric tool as claimed in claim 5, characterized in that: The power plug determination method comprises: According to GB 1002 standard, use a vernier caliper or micrometer to check the structural dimensions of the power plug; If any item in the test results exceeds the specified value, it is preliminarily determined that the power plug does not meet the quality requirements.

7. The method for quickly determining the main quality problems of an electric tool as claimed in claim 5, characterized in that: The method for determining the power connection and the external flexible wire includes: Use a micrometer to measure the cross-sectional area of ​​the wire; Use an electronic scale and ruler to measure the actual area of ​​the wire, and use a lighter to test the melting point to confirm the material; Measure the wire resistance value using a bridge or DC resistance meter. If the resistance exceeds the standard, the soft wire is judged to not meet the quality requirements.

8. The method for quickly determining the main quality problems of an electric tool as claimed in claim 5, characterized in that: The electromagnetic compatibility determination method comprises: Check whether an electrical filter device is installed at the power input switch of the power tool; If the electrical filter is not installed, send the power tool to a statutory quality inspection agency for electromagnetic compatibility testing.

9. The method for quickly determining the main quality problems of an electric tool as claimed in claim 5, characterized in that: The method for determining the electrical strength includes: Use the capacitance range of the FULUK17+ multimeter to measure the capacitance between the exposed metal chuck and the motor input terminal of the Class II power tool; If the capacitance is around 1.00nF, it indicates that the exposed metal chuck of the power tool is directly connected to the motor rotor core and needs to be sent to a statutory quality inspection agency for electrical strength testing.

10. The method for quickly determining the main quality problems of an electric tool according to claim 5, characterized in that: The method for determining the sign includes: According to GB 3883.1, the clarity of the power tool markings shall be checked by visual inspection or wiping with water; If the mark is blurred or falls off, it is judged that the mark does not meet the quality requirements.

Images