Bicycle safety test method

Abstract

The invention provides a bicycle safety test method, and relates to the technical field of children bicycles. The bicycle safety test method comprises the following steps: placing a child test model of which the feet are provided with force sensors in a child bicycle to be tested; the to-be-tested child bicycle is positioned at a preset test position, wherein the preset test position is arranged at the high position of the slope in the test site; loosening the to-be-tested child bicycle to enable the to-be-tested child bicycle to move from the preset test position to the low position along the slope; repeating the testing process for multiple times, and observing and recording the sensing value of the force sensor after the foot is clamped between the crank and the frame of the child bicycle in the testing process for multiple times; and risk assessment and improvement measures are made according to sensing values of the force sensor in multiple testing processes. According to the bicycle safety test method, the riding risk of a child bicycle with a dead flight structure can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of children's bicycles, and in particular to a bicycle safety testing method. Background Art

[0002] Children's bicycles are extremely popular. Frequent riding of children's bicycles can not only bring children the joy of playing and entertainment, but also play a good exercise role, promoting children's physical health and mental development. Some existing children's bicycles use a fixed gear structure. However, when riding a children's bicycle with a fixed gear structure, the rotation direction of the crank is always consistent with the movement direction of the rear wheel, that is, when the pedal is stepped forward, the bicycle moves forward, and when the pedal is stepped backward, the bicycle moves backward. If the pedal is stepped on and not moved, the bicycle stops rotating. In the absence of adult supervision, when children ride fast, if they encounter an emergency such as downhill, they usually subconsciously use their feet to brake. At this time, the rapidly rotating crank will bring the child's ankle into the gap between the crank and the frame. Due to the characteristics of the fixed gear structure, as the rear wheel rotates, the child's ankle becomes more and more stuck. In severe cases, professional cutting tools are required to cut off the crank before the foot can be pulled out. At present, although there are industry testing standards for children's bicycles, the standards do not stipulate and require the above risk items, and there are no safety requirements and testing methods for children's bicycles with fixed gear structures. Summary of the invention

[0003] The object of the present invention is to provide a bicycle safety testing method, which can reduce the riding risk of a children's bicycle with a fixed gear structure.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A bicycle safety test method is applied to a children's bicycle with a fixed gear structure and is used to test the safety of the children's bicycle. The bicycle safety test method includes:

[0006] S1, placing a child test model with force sensors on its feet on the children's bicycle to be tested;

[0007] S2, positioning the child bicycle to be tested provided with the child test model at a predetermined test position, wherein the predetermined test position is set at a high position of a slope in a test site;

[0008] S3. Start the test, release the children's bicycle to be tested, so that the children's bicycle to be tested moves along the slope from the predetermined test position to a lower position;

[0009] S4, repeating the test process for multiple times, observing and recording the sensing value of the force sensor after the foot of the child test model is stuck between the crank and the frame of the children's bicycle during the multiple tests;

[0010] S5, making risk assessment and improvement measures according to the sensing values ​​of the force sensor during multiple tests.

[0011] As a further technical solution, the test process adopts a variable control test method, and the variable control test method includes:

[0012] The child test model corresponding to a certain age group is used, and the same child bicycle to be tested equipped with the child test model is placed on slopes with different inclination angles to complete multiple test processes, and the sensing value of the force sensor during each test process is recorded.

[0013] As a further technical solution, the inclination angle of the slope is set to 12°, 15°, or 20°.

[0014] As a further technical solution, the test process adopts a variable control test method, which includes:

[0015] The child test models corresponding to different age groups are used, and the same children's bicycle to be tested with the child test models of the corresponding age groups is placed on the same slope to complete multiple test processes, and the sensing value of the force sensor during each test process is recorded.

[0016] As a further technical solution, the age groups of the child test model correspond to 4 years old, 6 years old, and 8 years old respectively.

[0017] As a further technical solution, a re-inspection is also included before the risk assessment is made according to the sensing values ​​of the force sensor during multiple tests. The re-inspection method includes:

[0018] The first step is to place the child bicycle to be tested provided with the child test model at a re-inspection site, connect the mounting shaft of the front wheel of the child bicycle to be tested to a positioning assembly, and suspend the front wheel in the air;

[0019] The second step is to connect the rear wheel of the children's bicycle to be tested to the re-inspection power assembly, and the re-inspection power assembly rotates to drive the rear wheel to rotate;

[0020] The third step is to adjust the rotation frequency of the re-test power assembly to simulate the rotation frequency of the rear wheel of the children's bicycle to be tested when it moves on the slope;

[0021] Step 4, repeating the re-testing process multiple times, observing and recording the number of times the foot of the child test model is stuck between the crank and the frame of the child bicycle during the multiple re-testing processes, and recording the sensing value of the force sensor placed on the foot of the child test model after the foot is stuck;

[0022] Step 5, comparing the sensing values ​​of the force sensor after the foot is stuck during the test process and the re-test process, and calculating the deviation value;

[0023] Step 6. If the deviation value after comparison is less than the set deviation value, a risk assessment is made. If the deviation value after comparison is greater than the set deviation value, the testing process and re-inspection process are repeated.

[0024] As a further technical solution, the method for calculating the deviation value includes: Among them, H is the deviation value, N1 is the sensing value of the force sensor during the test process, and N2 is the sensing value of the force sensor during the re-inspection process.

[0025] As a further technical solution, the deviation value is set to be less than 0.05.

[0026] As a further technical solution, before the safety testing process begins, a plurality of sensors are provided on the child test model. After the feet of the child test model are stuck, the sensing values ​​of the plurality of sensors are observed and recorded to interpret the secondary injuries on the child test model after the children's bicycle to be tested falls over.

[0027] As a further technical solution, before starting the test, a torque sensor among the multiple sensors is arranged on the neck of the child test model, a compression sensor is arranged on the abdomen of the child test model, and a displacement sensor and an acceleration sensor are arranged on the torso of the child test model;

[0028] After the test process, the secondary injuries on the child test model are interpreted by comparing the sensing values ​​of the multiple sensors after multiple overturnings during each test process.

[0029] Compared with the prior art, the present invention has the following technical advantages:

[0030] Since a force sensor is provided at the foot of the child test model, during the test process, the child test model with a force sensor at the foot is placed at the high part of the slope in the outdoor test site, and then the child bicycle is released, so that the child bicycle with the child test model is moved from the predetermined test position at the middle and high part of the slope to the low part of the slope to simulate the riding process of the child bicycle with a fixed gear structure, and during the movement, it is observed whether the foot of the child test model is stuck between the crank and the frame; then the above test process is repeated many times, and the sensing value on the foot force sensor after the foot of the child test model is stuck between the crank and the frame is recorded; according to the sensing value on the force sensor, a risk assessment is made for the safety problems that may occur during the riding of the child bicycle with a fixed gear structure, and improvement measures are proposed. During the whole process, with the help of the child test model, the slope and the force sensor, the safety test of the child bicycle with a fixed gear structure is completed, and a risk assessment is made, and improvement measures are proposed to reduce the riding risk of the child bicycle with a fixed gear structure during the actual riding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0032] Figure 1 is a schematic diagram of a children's bicycle during a test in a bicycle safety test method provided by an embodiment of the present invention;

[0033] Figure 2 The present invention is a simplified schematic diagram of a children's bicycle during a re-inspection process in a bicycle safety testing method provided by an embodiment of the present invention.

[0034] In the figure:

[0035] 100, children's bicycle; 110, crank; 120, frame; 130, front wheel; 140, rear wheel;

[0036] 200, positioning component;

[0037] 300. Re-inspect the power components. DETAILED DESCRIPTION

[0038] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0039] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0040] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects before and after are in an "and / or" relationship.

[0041] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0042] In the present application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, and the like. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0043] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0044] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0045] Combination Figure 1 and Figure 2 As shown, the bicycle safety testing method is applied to a children's bicycle 100 with a fixed gear structure, and is used to test the safety of the children's bicycle 100, and make risk assessment and improvement measures according to the test results. The bicycle safety testing method includes the following steps:

[0046] In the first step, a force sensor in the sensor assembly is set at the foot of the child test model, and the child test model is placed on the children's bicycle 100 to be tested.

[0047] In the second step, the child bicycle 100 to be tested provided with the child test model is positioned at a predetermined test position, wherein the predetermined test position is set at a high position of a slope in an outdoor test field.

[0048] The third step is to start the test by releasing the bicycle 100 to be tested so that the bicycle 100 to be tested moves from a predetermined test position to a lower position along the slope.

[0049] The fourth step is to repeat the test process for multiple times, and observe and record the sensing value of the force sensor after the foot of the child test model is stuck between the crank 110 and the frame 120 of the children's bicycle 100 during the multiple tests.

[0050] The fifth step is to make risk assessment and improvement measures based on the sensing values ​​of the force sensor during multiple tests.

[0051] Since a force sensor is provided at the foot of the child test model, during the test process, the child test model with a force sensor at the foot is placed at the high part of the slope in the outdoor test site, and then the child bicycle 100 is released, so that the child bicycle 100 provided with the child test model moves from the predetermined test position at the high part of the slope to the low part of the slope to simulate the riding process of the child bicycle 100 with a fixed gear structure, and observes whether the foot of the child test model is stuck between the crank 110 and the frame 120 during the movement; then the above test process is repeated many times, and the sensing value on the force sensor after the foot of the child test model is stuck in the crank 110 and the frame 120 is recorded; according to the sensing value on the force sensor, a risk assessment is made for the safety problems that occur during the riding process of the child bicycle 100 with a fixed gear structure, and improvement measures are proposed. During the whole process, with the help of the child test model, the slope and the force sensor, the safety test of the child bicycle 100 with a fixed gear structure is completed, and a risk assessment is made, and improvement measures are proposed to reduce the riding risk of the child bicycle 100 with a fixed gear structure during the actual riding process.

[0052] In order to further improve the comprehensiveness of the test results during the test process, force sensors are set on both feet of the child test model; in order to further improve the accuracy of the test results during the test process, multiple force sensors are set on the feet on the same side of the child test model. When the foot of the child test model is inserted between the crank 110 and the frame 120, the multiple force sensors on the same side of the foot corroborate each other to further improve the accuracy of the test results.

[0053] Preferably, the test process adopts a variable control test method, which includes: using a child test model corresponding to the same age group, and placing the same child bicycle 100 to be tested with the child test model on slopes with different inclination angles to complete multiple test processes, and recording the sensing value of the force sensor. Repeat the test multiple times on slopes with different inclination angles to simulate different driving speeds of the child bicycle 100. During the repeated test process, record the relevant data, and then perform corresponding comparative analysis on the data corresponding to the slopes with different inclination angles to ensure the accuracy when making risk assessments. In order to improve the accuracy and objectivity of the test results, thereby improving the accuracy and comprehensiveness of the risk assessment results, and further reduce the riding risk of the child bicycle 100 during actual riding.

[0054] During the test, if the inclination angle of the slope is too small, the speed of the children's bicycle 100 when driving autonomously on the slope will be relatively small, or it may not be able to drive autonomously on the slope, making it impossible to conduct a safety test; if the inclination angle of the slope is too large, the speed of the children's bicycle 100 when driving autonomously on the slope will increase accordingly, making the test process more dangerous and unable to obtain objective test results. In order to ensure the accuracy and objectivity of the safety test results, in this embodiment, three slopes with different inclination angles are selected for testing, and the inclination angles of the slopes are 12°, 15°, and 20°, respectively. In other embodiments, four, five, six, etc. slopes with different inclination angles may also be selected for safety testing.

[0055] Preferably, the test process adopts a variable control test method, which includes: using child test models corresponding to different age groups, and placing the same child bicycle 100 to be tested with the corresponding child test models on the same slope to complete multiple test processes, and recording the sensing values ​​of each force sensor. Place the child test models corresponding to different age groups to simulate the driving safety of children of different ages at the same driving speed. During the repeated test process, record the relevant data, and then perform corresponding comparative analysis on the data corresponding to the child test models of different age groups to further ensure the accuracy, comprehensiveness and objectivity of the test results.

[0056] Preferably, in this embodiment, the age groups of the child test models correspond to 4 years old, 6 years old, and 8 years old. In other embodiments, the age groups of the child test models may also correspond to 4 years old, 5 years old, and 7 years old.

[0057] In this embodiment, based on the above test conditions, a test is conducted to obtain the probability of the foot getting stuck between the crank 110 and the frame 120 and the bicycle tipping over. The specific test data are as follows:

[0058]

[0059] In this embodiment, based on the above test conditions, a test is conducted to obtain multiple force conditions of the foot after the foot is clamped between the crank 110 and the frame 120. The specific test data are as follows:

[0060]

[0061]

[0062] In order to further improve the accuracy of the test results and thus ensure safety during subsequent riding, in this embodiment, a re-inspection is also included before making a risk assessment based on the sensing values ​​of the force sensor during multiple tests. The re-inspection method includes: placing the child bicycle 100 to be tested with a child test model at a re-inspection site, connecting the mounting shaft of the front wheel 130 in the child bicycle 100 to be tested to the positioning assembly 200, and leaving the front wheel 130 suspended in the air.

[0063] The rear wheel 140 of the children's bicycle 100 to be tested is placed on the re-inspection power assembly 300 , and the re-inspection power assembly 300 rotates to drive the rear wheel 140 to rotate.

[0064] The rotation frequency of the re-test power assembly 300 is adjusted to simulate the rotation frequency of the rear wheel 140 when the children's bicycle 100 to be tested moves on a slope.

[0065] The re-testing process is repeated multiple times, and the number of times the foot of the child test model is stuck between the crank 110 and the frame 120 of the children's bicycle 100 is observed and recorded during the multiple re-testing processes, and the sensing value of the force sensor placed on the foot of the child test model after the foot is stuck is recorded.

[0066] Compare the sensing values ​​of the force sensor after the foot is stuck during the test process and the re-test process, and calculate the deviation value.

[0067] If the deviation value after comparison is less than the set deviation value, a risk assessment is made. If the deviation value after comparison is greater than the set deviation value, it means that the test result or re-inspection result is inaccurate, and the test process and re-inspection process need to be repeated to make the deviation value less than the set deviation value to ensure the accuracy of the test results, thereby ensuring the accuracy and comprehensiveness of the risk assessment results.

[0068] The re-inspection power assembly 300 is set as a rotating wheel assembly; during the re-inspection, the mounting shaft of the front wheel 130 of the children's bicycle 100 is connected to the positioning assembly 200 and is suspended, and the rear wheel 140 is matched with the rotating wheel assembly in transmission; during the test, the rotating wheel assembly rotates counterclockwise to drive the rear wheel 140 to rotate clockwise, thereby driving the crank 110 to rotate clockwise to simulate the running of the children's bicycle 100. By adjusting the rotation speed of the rotating wheel assembly, the rotation speed of the rear wheel 140 of the children's bicycle 100 is equal to the rotation speed of the children's bicycle 100 running autonomously on a slope with an inclination angle of 12°, so as to facilitate the re-inspection. At the same time, according to the different friction coefficients of the slippery road surface after rain and the dry road surface in a sunny state, the rotation speed of the rotating wheel assembly can also be adaptively adjusted to simulate the running state of the children's bicycle 100 on the slippery road surface after rain and the dry road surface in a sunny state; to ensure the convenience and efficiency of the re-inspection.

[0069] In this embodiment, the child test models corresponding to the age groups of 4, 6, and 8 are placed on the children's bicycle 100, and the re-inspection process is completed on a slope with an inclination angle of 12°. During the re-inspection process, after the feet are stuck between the crank 110 and the frame 120, according to the multiple force conditions of the feet, the specific re-inspection data are obtained as follows:

[0070] age Retest value (N) 4 years old ＞350 6 years old ＞360 8 years old ＞360

[0071] Preferably, the method for calculating the deviation value includes: Among them, H is the deviation value, N1 is the sensing value of the force sensor during the test, and N2 is the sensing value of the force sensor during the re-test. And the deviation value is set to <0.05.

[0072] Specifically:

[0073] age Retest value (N) Field test value (N) deviation 4 years old ＞350 ＞340 0.029 6 years old ＞360 ＞370 0.027 8 years old ＞360 ＞350 0.028

[0074] This shows that the above experiment complies with the setting of the deviation value. Therefore, a risk assessment can be made for the above safety testing process, and improvement measures can be proposed based on the risks that may exist in the testing process.

[0075] Furthermore, after the foot of the child test model is stuck, the sensing value of the sensor component is observed and recorded to interpret the secondary injury on the child test model after the tested children's bicycle 100 falls over.

[0076] Specifically, before starting the test, the torque sensor in the sensing assembly is set on the neck of the child test model to evaluate the degree and frequency of sprains on the neck according to the sensing value of the torque sensor; the compression sensor is set on the abdomen of the child test model to evaluate the degree and frequency of crush injuries and contusions on the neck according to the sensing value of the compression sensor; the displacement sensor and the acceleration sensor are set on the child test model to evaluate the degree and frequency of abrasions or bruises on the neck according to the corresponding sensing values; after the test process, the secondary injuries on the child test model are interpreted by comparing the sensing values ​​of each sensor after multiple overturns.

[0077] According to the force applied to the feet of the child test model, the following interpretation can be made: during riding, the inclination angle of the slope (the running speed of the child bicycle 100) is directly proportional to the probability of the child bicycle 100 tipping over after the foot is stuck between the crank 110 and the frame 120, and is inversely proportional to the age group corresponding to the child test model, that is, in the same age group, the greater the inclination angle of the slope, the greater the probability of the child bicycle 100 tipping over after the foot is stuck between the crank 110 and the frame 120; on the same slope, the child test model The older the age group, the lower the probability that the child bicycle 100 will tip over after the foot is stuck between the crank 110 and the frame 120; and on the same slope, if the age group corresponding to the child test model is over six years old, the external force received by the child test model after the foot is stuck is smaller than the external force received by the child test model when the age group corresponding to the child test model is less than six years old; in the same age group, the greater the inclination angle of the slope, the greater the external force received after the foot is stuck between the crank 110 and the frame 120. Therefore, combined with the overall tipping probability, a child bicycle 100 with a fixed gear structure will have a few injury incidents during riding, but the possibility is small, and the child bicycle 100 with a fixed gear structure is more suitable for older children, preferably over six years old, and is more suitable for riding at a slow speed or on a field with a smaller slope. When the foot is stuck between the crank 110 and the frame 120, the skin of the foot may be damaged by the friction between the crank 110 and the frame 120; the crank 110 and the frame 120 place the ankle in an uneven space, which may easily cause damage to the skin and tissue of the foot; when the ankle is under the pressure of the crank 110 and the frame 120 for a long time, the blood circulation will be affected, which may cause tissue hypoxia and ischemia, thereby causing foot injury; in the process of the children's bicycle 100 tipping over, the head, chest, back and other areas may hit the ground, causing abrasions or contusions, and the neck may be twisted; in the process of the children's bicycle 100 tipping over, the abdomen may be bruised by the handlebar of the children's bicycle 100, and after the children's bicycle 100 tipping over, the legs may be squeezed. Based on the above interpretation, when children aged 3-8 ride a children's bicycle 100 with a fixed gear structure, in an emergency such as going downhill, their feet may get stuck between the crank 110 and the frame 120, causing abrasions, sprains or crush injuries to the children's feet; after the feet are stuck between the crank 110 and the frame 120, the children's bicycle 100 may tip over, causing secondary injuries such as abrasions, contusions, and crush injuries to the trunk and head. Based on the above assessment, the corresponding improvement measures are: adding a brake mechanism to provide the rider with stronger braking force and more controllable vehicle balance to avoid the risk of injury caused by excessive speed in emergency situations.A foot harness is added to the pedal of the crank 110. When the crank 110 rotates at a high frequency, the foot harness can prevent the foot from slipping off the pedal, improve the safety factor, and facilitate the rider to control the pedal when decelerating or braking. A guard plate is added between the crank 110 and the frame 120. During the pedaling process, due to the large gap between the crank 110 and the frame 120, the child's ankle is easily stuck between the crank 110 and the plug-in frame. A guard plate is added between the crank 110 and the frame 120 to reduce the gap and reduce the probability of the foot being stuck. The following warnings are added to the children's bicycle 100: It is strictly forbidden to ride on roads, slopes, wet and slippery places; the caregiver must not leave during the child's riding; children must wear safety riding protective gear when riding; high-speed riding is strictly prohibited; the best age for the rider should be greater than six years old, and the minimum age should not be less than 4 years old.

[0078] In order to ensure the safety of the test results, the above test process uses the same children's bicycle 100 with a fixed gear structure. In this embodiment, a 12-inch children's bicycle 100 is used as a sample to carry out the above process.

[0079] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A bicycle safety testing method, characterized in that: The method is applied to a children's bicycle (100) with a fixed gear structure and is used to test the safety of the children's bicycle (100). The bicycle safety test method comprises: S1, placing a child test model with force sensors on its feet on the children's bicycle (100) to be tested; S2, positioning the children's bicycle (100) to be tested provided with the children's test model at a predetermined test position, wherein the predetermined test position is set at a high position on a slope in a test site; S3. Start the test, release the children's bicycle (100) to be tested, so that the children's bicycle (100) to be tested moves along the slope from the predetermined test position to a lower position; S4, repeating the test process multiple times, observing and recording the sensing value of the force sensor after the foot of the child test model is stuck between the crank (110) and the frame (120) of the children's bicycle (100) during the multiple test processes; S5, making risk assessment and improvement measures according to the sensing values ​​of the force sensor during multiple tests.

2. The bicycle safety testing method according to claim 1, characterized in that: The test process adopts a variable control test method, which includes: The child test model corresponding to a certain age group is used, and the same child bicycle (100) to be tested provided with the child test model is placed on slopes with different inclination angles to complete multiple test processes, and the sensing value of the force sensor during each test process is recorded.

3. The bicycle safety testing method according to claim 2, characterized in that: The inclination angles of the slope are set to 12°, 15°, and 20°.

4. The bicycle safety testing method according to claim 1, characterized in that: The test process adopts a variable control test method, which includes: The child test models corresponding to different age groups are used, and the same child bicycle (100) to be tested provided with the child test models of the corresponding age groups is placed on the same slope to complete multiple test processes, and the sensing value of the force sensor during each test process is recorded.

5. The bicycle safety testing method according to claim 4, characterized in that: The age groups of the child test model correspond to 4 years old, 6 years old, and 8 years old respectively.

6. The bicycle safety testing method according to claim 1, characterized in that: Before making a risk assessment based on the sensing values ​​of the force sensor during multiple tests, a re-inspection is also included, and the re-inspection method includes: The first step is to place the child bicycle (100) to be tested provided with the child test model at a re-inspection site, connect the mounting shaft of the front wheel (130) in the child bicycle (100) to be tested to a positioning assembly (200), and suspend the front wheel (130); The second step is to connect the rear wheel (140) of the children's bicycle (100) to be tested to the re-inspection power assembly (300) by transmission, and the re-inspection power assembly (300) rotates to drive the rear wheel (140) to rotate; The third step is to adjust the rotation frequency of the retest power assembly (300) to simulate the rotation frequency of the rear wheel (140) when the children's bicycle (100) to be tested moves on the slope; The fourth step is to repeat the re-testing process multiple times, observe and record the number of times the foot of the child test model is stuck between the crank (110) and the frame (120) of the children's bicycle (100) during the multiple re-testing processes, and record the sensing value of the force sensor placed on the foot of the child test model after the foot is stuck; Step 5, comparing the sensing values ​​of the force sensor after the foot is stuck during the test process and the re-test process, and calculating the deviation value; Step 6. If the deviation value after comparison is less than the set deviation value, a risk assessment is made. If the deviation value after comparison is greater than the set deviation value, the testing process and re-inspection process are repeated.

7. The bicycle safety testing method according to claim 6, characterized in that: Methods for calculating the deviation value include: Among them, H is the deviation value, N1 is the sensing value of the force sensor during the test process, and N2 is the sensing value of the force sensor during the re-inspection process.

8. The bicycle safety testing method according to claim 7, characterized in that: Set the deviation value to <0.

05.

9. The bicycle safety testing method according to claim 1, characterized in that: Before the safety test process begins, a plurality of sensors are provided on the child test model, and after the foot of the child test model is stuck, the method further includes observing and recording the sensing values ​​of the plurality of sensors after the foot is stuck, so as to interpret the secondary damage on the child test model after the child bicycle (100) to be tested falls over.

10. The bicycle safety testing method according to claim 9, characterized in that: Before starting the test, a torque sensor among the plurality of sensors is arranged on the neck of the child test model, a compression sensor is arranged on the abdomen of the child test model, and a displacement sensor and an acceleration sensor are arranged on the torso of the child test model; After the test process, the secondary injuries on the child test model are interpreted by comparing the sensing values ​​of the multiple sensors after multiple overturnings during each test process.

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