Intelligent door lock accelerated life test method

Abstract

The invention discloses an intelligent door lock accelerated life test method comprising the following steps: S1, taking M * N intelligent door locks as test samples, and dividing the test samples into N groups, each group comprising M test samples; s2, calculating the test temperature of each group of test samples; s3, respectively carrying out an accelerated stress test on each group of test samples; S4, calculating the accelerated stress average test life times of each group of test samples; s5, substituting the test temperature and the average test life times into Ln (Life) = LnA + Ea / (kT) to obtain coordinate axis points; s6, performing linear fitting on the coordinate axis points to obtain a slope Ea, namely the activation energy of the test sample; s7, calculating an acceleration factor AF of the test sample; and S8, calculating the number of estimated service life times of the intelligent door lock under the normal working condition temperature, wherein Tr = a * TN. The intelligent door lock life detection efficiency can be improved, and the accuracy of the working life prediction result of the test sample is high.

Description

Technical Field

[0001] The invention belongs to the field of daily hardware quality testing, and in particular relates to an accelerated life test method for an intelligent door lock. Background Art

[0002] A smart door lock is a lock that electronically identifies and processes relevant information, controls the actuator to open and close, and achieves a specified security level. As a hot-selling product in smart homes, it is often installed on entrance doors.

[0003] Smart door locks are frequently used in daily life. To ensure product quality, it is necessary to evaluate the service life of smart door locks. According to the GB21556-2008 "General Technical Requirements for Lock Safety" standard: Under rated voltage and rated load current, after 3,000 openings and closings, there should be no damage to electrical components, and no damage or adhesion failure to mechanical parts.

[0004] During daily testing, the sample needs to be installed on the simulated door and connected correctly according to the requirements of the instructions, and the rated current and voltage are applied at the same time, and then installed on the corresponding durable equipment for automatic continuous opening and closing to reach the index value. This method simulates the normal use of smart door locks. Although it can reproduce the number of times the product is opened and closed, the durable equipment needs 24 hours to complete. At present, the relevant standards and requirements for smart door locks are becoming more and more stringent. For example, the GA 374-2019 "Electronic Anti-theft Lock" standard stipulates: Under the rated voltage and rated load current, 10,000 lock opening and closing operations are performed. After the test, there should be no damage or failure of electrical or mechanical components, and they should be able to work normally. Since this test method is roughly the same as the former, the time for the durable equipment to complete is also increased to 80 hours with the increase in the number of times; in addition, in some certification technical specifications, at high-level requirements, smart door locks need to meet the requirements of 100,000 opening and closing times, and the time for the durable equipment to complete rises to 800 hours to complete. In the past two years, my country's smart door lock industry has developed rapidly, and companies have an increasingly strong demand for the export of smart door locks. In the European standard EN 14846; 2008, the highest level test number of electric locks reaches 200,000 times.

[0005] The above test method has the following disadvantages:

[0006] 1. Long testing time: 100,000 tests take 2 months to complete, which cannot meet the needs of rapid life testing of products for rapid development, production and market launch.

[0007] 2. The wear and tear on durable equipment is large: after completing a test, the equipment will be depreciated greatly, and the economic benefits are low.

[0008] 3. The test through the endurance machine is only for one sample. If the test sample fails during the life test, a new test sample is required for retesting. This test method cannot accurately reflect the overall quality status of the sample. Summary of the invention

[0009] The purpose of the present invention is to provide a smart door lock accelerated life test method which is simple and easy to implement, can improve detection efficiency and has accurate life prediction results.

[0010] The purpose of the present invention is achieved by the following technical measures: a method for accelerating the life test of a smart door lock, characterized by comprising the following steps:

[0011] S1. Take M×N smart door locks as test samples and divide them into N groups, with M test samples in each group;

[0012] S2. Calculate the test temperature C1, C2, C3, ..., CN of each group of test samples;

[0013] S3. Carry out accelerated stress test on each group of test samples:

[0014] (1) Install one group of test samples on the temperature accelerated stress test device, and then place the temperature accelerated stress test device with the group of test samples in the temperature test chamber;

[0015] (2) Adjust the temperature of the temperature test chamber to the test temperature of the group of test samples, and when the test temperature is reached in the temperature test chamber, the temperature acceleration stress test device performs the set X actions on the group of test samples, and records the number of times the lock tongue of the group of test samples is extended;

[0016] If the test sample does not fail after completing X actions, the number of opening and closing times of this test sample is recorded as X times;

[0017] If the test sample fails before completing X actions, record the number of actions completed before the test sample fails;

[0018] S4, calculating the average accelerated stress test life times T1, T2, ..., TN of each group of test samples;

[0019] S5. Using the Arrhenius Index model:

[0020] Life=Aexp{Ea / (kT)}Formula ⑴

[0021] Where: A is a constant; Ea is the activation energy; T is the Kelvin temperature; k is the Boltzmann constant = 8.617×10-5ev / k;

[0022] Taking the natural logarithm of both sides of formula (1) yields the following formula:

[0023] Ln(Life)=LnA+Ea / (kT) formula (2)

[0024] Substitute the test temperature obtained in step S2 and the average test life times obtained in step S4 into formula (2) to obtain the coordinate axis points: {(1 / C1+K), Ln(T1)}, …{(1 / CN+K), Ln(TN)};

[0025] S6. Linearly fit these coordinate axis points to obtain the slope Ea, that is, the activation energy of the test sample;

[0026] S7, substitute the daily working temperature Cr of the smart door lock design, the test temperature CN of the Nth group of test samples obtained in step S2, and the activation energy of the test samples into the Arrhenius equation:

[0027] AF=exp{(Ea / k)×(1 / Tu-1 / Ts)}Formula⑶

[0028] Where: AF is the acceleration factor; Tu is the Kelvin temperature under normal use of the product; Ts is the environmental stress temperature during the product accelerated life test;

[0029] Get the acceleration factor AF of the test sample;

[0030] S8. Calculate the estimated working life of the smart door lock under normal working conditions and temperature according to the following formula: Tr = a × TN Formula (4)

[0031] Where a is the acceleration factor AF; TN is the average number of accelerated stress test life of the Nth group of test samples.

[0032] The present invention is simple and easy to implement, can improve the efficiency of intelligent door lock life detection, and has the advantage of high accuracy in predicting the working life of test samples.

[0033] The number of groups of test samples of the present invention is N≥4, and the number of test samples in each group is M≥5. The more the number of groups of test samples and the number of test samples in each group, the closer the estimated working life times predicted by the present invention are to the actual working life times of the tested smart door lock, but the corresponding test time is also longer.

[0034] In the step S2 of the present invention, the test temperature of the first group of test samples is C1=1.8×Cr, Cr is the designed daily working temperature of the smart door lock, and the test temperature of the i-th group of test samples is Ci=C1+(i-1)×Δ, Δ=(CN-C1) / 3, 2≤i≤N.

[0035] In the step S6, the present invention uses the chart function in Excel to substitute a number of coordinate axis points, and configures the distribution line according to the principle that the trend line of the data substitution is a linear and distribution line to display the fitted formula. Thus, the process of obtaining the distribution line can be simplified, avoiding cumbersome problems in the process of linear fitting.

[0036] The temperature acceleration stress test device of the present invention comprises a three-dimensional frame, a lock frame for mounting a test sample, a detection unit for detecting the lock tongue of the test sample, an action unit for unlocking the test sample, and a control unit for controlling the action times of the action unit and recording the detection times of the detection unit. The two sides of the frame are respectively provided with a slide groove arranged along the X direction. The lock frame, the detection unit and the action unit are all several and can be slidably mounted on the slide groove so that the lock frame, the detection unit and the action unit can all be adjusted in position in the X direction and multiple test samples can be tested at the same time. The present invention can detect several test samples at the same time, which can further improve the detection efficiency.

[0037] The detection unit of the present invention includes a detection member and a first vertical bracket, wherein the first vertical bracket can be slidably mounted on a slide slot, and the detection member can be slidably mounted on the first vertical bracket along the Y direction and the Z direction so that the detection member can be adjusted in position in the X direction, the Y direction and the Z direction.

[0038] The action unit of the present invention comprises an action piece and a second vertical bracket, wherein the second vertical bracket can be slidably mounted on a slide slot, and the action piece can be slidably mounted on the second vertical bracket along the Y direction and the Z direction so that the action piece can be positionally adjusted in the X direction, the Y direction and the Z direction.

[0039] In the step S3⑵ of the present invention, the temperature acceleration stress testing device controls the action unit through the control unit to perform the set X actions on the smart door lock and simultaneously records the number of times the lock tongue of the smart door lock is extended through the detection unit.

[0040] Compared with the prior art, the present invention has the following significant effects:

[0041] (1) The present invention is simple and easy to implement, can improve the efficiency of intelligent door lock life detection, and has the advantage of high accuracy in predicting the working life of the test sample.

[0042] (2) The present invention can test multiple test samples simultaneously by setting up an accelerated stress test device, which is convenient and quick and can further improve the detection efficiency.

[0043] ⑶ The present invention can solve the problems of the existing life test method, such as long test time and large loss of durability test equipment, has significant application value, is suitable for all smart door locks, is helpful for quality inspection, and is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] Figure 1 It is a flowchart of the present invention;

[0046] Figure 2 It is a structural schematic diagram of the temperature accelerated stress test device used in the present invention.

[0047] In the figure: 1-detection unit, 2-locking frame, 3-action unit, 4-frame, 5-control unit, 6-slide slot, 7-first vertical bracket, 8-second vertical bracket. DETAILED DESCRIPTION

[0048] The present invention is further illustrated below through the description of specific implementation methods, but this is not a limitation of the present invention. Those skilled in the art can make various modifications or improvements based on the basic idea of ​​the present invention, but as long as they do not deviate from the basic idea of ​​the present invention, they are all within the protection scope of the present invention.

[0049] like Figure 1 As shown, the present invention provides an accelerated life test method for a smart door lock, which specifically includes the following steps:

[0050] S1. Take M×N smart door locks as test samples and divide them into N groups, with M test samples in each group;

[0051] The more the number of test sample groups and the number of test samples in each group, the closer the estimated working life times that can be predicted by the present invention are to the actual working life times of the tested smart door lock, but the corresponding test time is also longer. Therefore, this embodiment selects N=4, M=5, which can effectively balance the accuracy of the predicted working life and the corresponding test time.

[0052] In addition, a temperature accelerated stress test device is set up, such as Figure 2As shown, the temperature acceleration stress test device includes a rectangular frame 4, a lock frame 2 for mounting a test sample, an action unit 3 for unlocking the test sample, a detection unit 1 for detecting the lock tongue of the test sample, and a control unit 5 for controlling the number of actions of the action unit 3 and recording the number of detections of the detection unit 1. Slide grooves 6 arranged along the X direction are respectively provided on both sides of the frame 4. The lock frame 2, the detection unit 1 and the action unit 3 are all in number and can be slidably installed on the slide grooves so that the lock frame 2, the detection unit 1 and the action unit 3 can be adjusted in position in the X direction and multiple test samples can be tested simultaneously. Among them, the detection unit 1 includes a detection piece and a first vertical bracket 7, the lower end of the first vertical bracket 7 can be slidably mounted on the slide groove 6, and the detection piece can be slidably mounted on the first vertical bracket 7 along the Y direction and the Z direction so that the detection piece can be adjusted in position in the X direction, the Y direction and the Z direction; the action unit 3 includes an action piece and a second vertical bracket 8, the upper end of the second vertical bracket 8 can be slidably mounted on the slide groove 6, and the action piece can be slidably mounted on the second vertical bracket 8 along the Y direction and the Z direction so that the action piece can be adjusted in position in the X direction, the Y direction and the Z direction.

[0053] S2. Calculate the test temperature C1, C2, C3, ..., CN of each group of test samples, that is, the temperature stress to which the test samples are subjected during the test;

[0054] The test temperature of the first group of test samples is C1 = 1.8 × Cr, where Cr is the designed daily operating temperature of the smart door lock, for example, 25 degrees Celsius;

[0055] Assume 2≤i≤N, the test temperature Ci of the i-th group of test samples satisfies Ci=C1+(i-1)×Δ, Δ=(CN-C1) / 3, and the test temperatures C2, C3, …, CN of the second to N-th groups of test samples are obtained;

[0056] S3. Carry out accelerated stress test on each group of test samples:

[0057] (1) Install one group of test samples on the temperature accelerated stress test device, and then place the temperature accelerated stress test device with the group of test samples in the temperature test chamber;

[0058] (2) Adjust the temperature of the temperature test box to the test temperature of the group of test samples, and when the test temperature is reached in the temperature test box, the temperature acceleration stress test device controls the action unit 3 to perform the set X actions on the group of test samples through the control unit 5, and the detection unit 1 records the number of times the lock tongue of the group of test samples is extended to ensure that the test samples complete one opening and closing operation;

[0059] If the test sample does not fail after completing X actions, the number of opening and closing times of this test sample is recorded as X times;

[0060] If the test sample fails before completing X actions, record the number of actions completed before the test sample fails;

[0061] The accelerated stress test ends when the above situation occurs to all the M test samples in the i-th group. The failure of the test sample is marked by the inability of the lock tongue of the test sample to retract, that is, after the action unit completes one action, the detection unit does not detect that the lock tongue has been extended once within a period of time.

[0062] S4, calculating the average accelerated stress test life times T1, T2, ..., TN of each group of test samples;

[0063] S5. Using the Arrhenius index model:

[0064] Life=Aexp{Ea / (kT)}Formula ⑴

[0065] Where: A is a constant; Ea is the activation energy; T is the Kelvin temperature; k is the Boltzmann constant

[0066] =8.617×10-5ev / k;

[0067] Taking the natural logarithm of both sides of formula (1), we get Ln(Life) as Y, (1 / T) as X, then X and Y form a straight line with a slope of Ea / k, and we get the following formula:

[0068] Ln(Life)=LnA+Ea / (kT) formula (2)

[0069] Substituting the test temperature obtained in step S2 and the average test life times obtained in step S4 into formula (2), we obtain:

[0070] Ln(T1)=LnA+(Ea / k)*(1 / C1+K);

[0071] …

[0072] Ln(TN)=LnA+(Ea / k)*(1 / CN+K);

[0073] That is, we get the coordinate axis points: {(1 / C1+K),Ln(T1)},…{(1 / CN+K),Ln(TN)};

[0074] S6. Linearly fit these coordinate axis points to obtain the slope Ea, that is, the activation energy of the test sample;

[0075] In this step, the chart function in Excel is used to substitute several coordinate axis points and configure the distribution line according to the following two principles:

[0076] Principle 1: The trend line into which the data is substituted is linear;

[0077] Principle 2: The distribution straight line shows the fitted formula.

[0078] This can simplify the process of obtaining the distribution line and avoid cumbersome problems in the process of linear fitting.

[0079] S7. Substitute the daily operating temperature Cr of the smart door lock design, the test temperature CN of the Nth group of test samples obtained in step S2, and the activation energy of the test samples into the Arrhenius equation as a relationship model between temperature and life times:

[0080] AF=exp{(Ea / k)×(1 / Tu-1 / Ts)}Formula⑶

[0081] Where: AF is the acceleration factor; Tu is the Kelvin temperature under normal use of the product; Ts is the environmental stress temperature during the product accelerated life test;

[0082] Get the acceleration factor AF of the test sample;

[0083] S8. Assuming the acceleration factor AF = a, it means that the life of the test sample under the test environment stress at the test temperature CN is a times that under the use environment temperature of Cr;

[0084] Calculate the estimated working life of the smart door lock under normal working conditions and temperature according to the following formula:

[0085] Tr=a×TN Formula⑷

[0086] Where a is the acceleration factor AF; TN is the average number of accelerated stress test life of the Nth group of test samples.

[0087] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for accelerating the life test of a smart door lock, characterized in that The following steps are involved: S1. Take M×N smart door locks as test samples and divide them into N groups, with M test samples in each group; S2. Calculate the test temperature C1, C2, C3, ..., CN of each group of test samples; S3. Carry out accelerated stress test on each group of test samples: (1) Install one group of test samples on the temperature accelerated stress test device, and then place the temperature accelerated stress test device with the group of test samples in the temperature test chamber; (2) Adjust the temperature of the temperature test chamber to the test temperature of the group of test samples, and when the test temperature is reached in the temperature test chamber, the temperature acceleration stress test device performs the set X actions on the group of test samples, and records the number of times the lock tongue of the group of test samples is extended; If the test sample does not fail after completing X actions, the number of opening and closing times of this test sample is recorded as X times; If the test sample fails before completing X actions, record the number of actions completed before the test sample fails; S4, calculating the average accelerated stress test life times T1, T2, ..., TN of each group of test samples; S5. Using the Arrhenius Index model: Life=Aexp{Ea / (kT)}Formula ⑴ Where: A is a constant; Ea is the activation energy; T is the Kelvin temperature; k is the Boltzmann constant = 8.617×10-5ev / k; Taking the natural logarithm of both sides of formula (1) yields the following formula: Ln(Life)=LnA+Ea / (kT) formula (2) Substitute the test temperature obtained in step S2 and the average test life times obtained in step S4 into formula (2) to obtain the coordinate axis points: {(1 / C1+K), Ln(T1)}, …{(1 / CN+K), Ln(TN)}; S6. Linearly fit these coordinate axis points to obtain the slope Ea, that is, the activation energy of the test sample; S7, substitute the daily working temperature Cr of the smart door lock design, the test temperature CN of the Nth group of test samples obtained in step S2, and the activation energy of the test samples into the Arrhenius equation: AF=exp{(Ea / k)×(1 / Tu-1 / Ts)}Formula⑶ Where: AF is the acceleration factor; Tu is the Kelvin temperature under normal use of the product; Ts is the environmental stress temperature during the product accelerated life test; Get the acceleration factor AF of the test sample; S8. Calculate the estimated working life of the smart door lock under normal working conditions and temperature according to the following formula: Tr=a×TN Formula⑷ Where a is the acceleration factor AF; TN is the average number of accelerated stress test life of the Nth group of test samples.

2. The method for accelerating the life test of a smart door lock according to claim 1, characterized in that: The number of test sample groups N≥4, and the number of test samples in each group M≥5.

3. The method for accelerating life test of smart door locks according to claim 2, characterized in that: In step S2, the test temperature of the first group of test samples is C1=1.8×Cr, Cr is the designed daily working temperature of the smart door lock, and the test temperature of the i-th group of test samples is Ci=C1+(i-1)×Δ, Δ=(CN-C1) / 3, 2≤i≤N.

4. The method for accelerating the life test of a smart door lock according to claim 3, characterized in that: In step S6, a plurality of coordinate axis points are substituted by using the chart function in Excel, and a distribution line is configured according to the principle that the trend line of the substituted data is a linear and distribution line displays the fitted formula.

5. The method for accelerating the life test of a smart door lock according to claim 4, characterized in that: The temperature acceleration stress test device comprises a three-dimensional frame, a lock frame for mounting a test sample, a detection unit for detecting a lock tongue of the test sample, an action unit for unlocking the test sample, and a control unit for controlling the action times of the action unit and recording the detection times of the detection unit. Slide grooves arranged along the X direction are respectively arranged on both sides of the frame. The lock frame, the detection unit and the action unit are all in number and can be slidably mounted on the slide grooves so that the lock frame, the detection unit and the action unit can all be adjusted in position in the X direction and multiple test samples can be tested simultaneously.

6. The method for accelerating the life test of a smart door lock according to claim 5, characterized in that: The detection unit includes a detection member and a first vertical bracket, the first vertical bracket can be slidably installed on the slide slot, and the detection member can be slidably installed on the first vertical bracket along the Y direction and the Z direction so that the detection member can be adjusted in position in the X direction, the Y direction and the Z direction.

7. The method for accelerating life test of smart door locks according to claim 6, characterized in that: The action unit includes an action piece and a second vertical bracket, the second vertical bracket is slidably mounted on the slide slot, and the action piece is slidably mounted on the second vertical bracket along the Y direction and the Z direction so that the action piece can be adjusted in position in the X direction, the Y direction and the Z direction.

8. The method for accelerating the life test of a smart door lock according to claim 7, characterized in that: In step S3⑵, the temperature acceleration stress testing device controls the action unit through the control unit to perform the set X actions on the smart door lock and simultaneously records the number of times the lock tongue of the smart door lock is extended through the detection unit.

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