An EMC test method for a household treadmill and a load device for the test

Abstract

The present invention discloses an EMC test method for a household treadmill and a load device for testing the same. The EMC test method adds a set load to the treadmill under test, and respectively tests the EMC characteristics at the lowest operating speed, half speed (half the maximum operating speed), and maximum operating speed, and examines the influence of different speeds on the EMC characteristics of the treadmill to the greatest extent, meets the requirement of "the EUT should be tested under all relevant operating modes and load conditions of the intended use" required in the standard, and examines the performance of the product more comprehensively. The load device of the present invention includes a support frame, a load bracket, a load-adjusting assembly, and a roller, and all the components are non-metallic. The load bracket can be moved up and down on the support frame, and the roller is used to press on the treadmill under test. By adjusting the load-adjusting assembly, the load weight of the roller pressing on the treadmill under test can be adjusted. The load device of the present invention will not interfere with the EMC test, and is more suitable for use in the EMC test of the treadmill.

Description

Technical Field

[0001] The present invention relates to the technical field of EMC testing of household treadmills, and in particular to an EMC testing method of a household treadmill and a load device for the testing. Background Art

[0002] As people's living standards improve, their pursuit of a healthy life is also increasing. In August 2021, the "National Fitness Plan (2021-2025)" once again emphasized the importance of improving the physical fitness of the whole people. The accompanying fitness craze also stimulated the development of the fitness product market. At the same time, the ensuing epidemic era has made people pay more attention to health, the sports and fitness consumer market continues to expand, and home fitness products have become mainstream. According to data from an e-commerce backend, more than 110 million people searched for sports products within one month during the epidemic. More and more users choose to exercise at home, and fitness needs are more diversified. More users intend to pursue better exercise results. Treadmills, as the most common home fitness product, are favored by users and have a large ownership volume. New products emerge in an endless stream, and the resulting safety issues have also brought new challenges to related standardized testing.

[0003] The testing of home treadmills involves EMC testing (electromagnetic compatibility testing). Nowadays, EMC testing for home treadmills is mainly carried out according to the relevant requirements of GB 4343.1-2024 and GB / T 4343.2-2020. However, as general standards, GB 4343.1-2024 and GB / T 4343.2-2020 do not make specific requirements for the testing methods of treadmills. There is still no unified standard for the testing conditions and methods such as operating status and load status.

[0004] As for the current EMC test methods for treadmills, the industry generally tests the treadmills at no load and at medium speed. However, treadmills are necessarily under load in actual use, and the interference characteristics of high-speed and low-speed operation are also different. Tests completed at no load and medium speed cannot truly reflect the electromagnetic interference and anti-interference capabilities generated by the treadmill in actual working conditions, and may not be able to discover hidden electromagnetic interference risks and product performance defects.

[0005] Therefore, we believe that it is necessary to conduct EMC tests on treadmills under load in order to obtain accurate data. In order to illustrate the necessity of treadmill load testing, we designed a set of comparative tests to read the conduction project data by applying a 60kg load to a treadmill of the same brand at different speeds. Figure 4 and Figure 5 By comparison, we can see that ( Figure 4 This is the state of the treadmill when it is unloaded and running at a speed of 1km. Figure 5The treadmill is loaded with 60kg and runs at a speed of 1km. When the treadmill runs at a low speed, the loaded data is close to the unloaded data, and only glitches appear in a few frequency bands. Figure 6 and Figure 7 By comparison, we can see that ( Figure 6 This is the state of the treadmill when it is unloaded and running at a speed of 6km. Figure 7 The treadmill is loaded with 60kg and runs at a speed of 6km / h. When running at medium speed, the peak value of the disturbance in the loaded state shifts slightly forward in the frequency domain, and the low-frequency disturbance shows an upward trend. Figure 8 and Fig. 9 By comparison, we can see that ( Figure 8 This is the state of the treadmill when it is unloaded and running at a speed of 12km.

[0006] Fig. 9 This is the state of the treadmill when it is loaded with 60kg and running at a speed of 12km / h. When running at high speed, the low-frequency interference increases significantly, and even exceeds the standard limit in the starting frequency band. The qualified samples in the no-load state become unqualified in the loaded state. This shows that whether it is loaded and the running speed will have a great impact on the EMC test results of the treadmill.

[0007] However, the existing treadmill test and load-increasing devices are not suitable for treadmill EMC testing, mainly in the following aspects:

[0008] 1. Currently, most treadmill tests are aimed at safety or performance. There is no test method and load for EMC testing of treadmills. Moreover, due to the particularity of EMC testing, load devices based on metal structures such as electronic control, magnetic attraction, and hydraulic pressure cannot be shared and cannot be used to examine the EMC characteristics of treadmills.

[0009] 2. The existing load devices are basically fixed structures and are not easy to move. Different from other conventional test items of treadmills, for EMC tests with special requirements for sites and layouts, the auxiliary load devices should usually have the characteristics of easy disassembly and easy assembly, so as to be transported between different test environments such as shielding rooms, darkrooms and immunity rooms with different requirements.

[0010] 3. According to the current EMC test process specified in GB 4343.1-2024 and GB / T 4343.2-2020, it is impossible to comprehensively evaluate the performance of the treadmill. There are no accurate requirements for the operating conditions and operating status of the treadmill. The test results cannot truly reflect the possible electromagnetic interference risks and product performance defects of the treadmill that cannot be detected.

[0011] For example, the Chinese patent application number 2017206287038 discloses a treadmill load tester, which involves the test of treadmill load and is a performance test. Another example is the Chinese patent application number 2021213667856 discloses a treadmill durability test device, which involves the test of treadmill durability and is a performance test. Moreover, the structures of the technical solutions of the above two patent documents are basically metal structures, and the components are not easy to disassemble, which are not suitable for EMC testing of treadmills.

[0012] The main reasons for the above problems are:

[0013] 1. The reason why there is no suitable load device in the prior art is that some existing load designs are mainly aimed at other test items such as safety regulations and materials. The electrical control, fixation and other structural designs are also designed to achieve test automation to the greatest extent, reduce the impact of human factors, and improve the rigor and accuracy of other type tests. These are beneficial designs for safety regulations, materials and other test items, but as mentioned above, they are not suitable for EMC test items.

[0014] 2. The reason why the existing test methods cannot examine the electromagnetic compatibility characteristics of the treadmill under actual operating conditions is that there is no clear system regulation for the EMC test methods of treadmills in the current standards. Even in the newly issued household appliance standard GB 4343.1-2024, the test requirements for treadmill products are still unclear. There is no clear explanation as to whether the test is loaded and under what operating conditions. Moreover, the test methods and load equipment of safety regulations, materials, and environmental tests cannot be used together for EMC testing. As a result, the current EMC test of treadmills does not actually meet the requirements of the standard that "the EUT should be tested under all relevant operating modes and load conditions of the intended use", which leads to the problem of being unable to fully examine the EMC characteristics of treadmills. This is mainly caused by the lack of targeted requirements in the standard.

[0015] Therefore, it is necessary to find a testing method that can meet the basic requirements of GB 4343.1-2024 and GB / T4343.2-2020 while making specific requirements and designs for the actual operating status of the treadmill, close to the actual working state of the treadmill, to simulate the electromagnetic interference and anti-interference ability generated during its actual use, thereby improving the accuracy and rigor of the test. Summary of the invention

[0016] The first object of the present invention is to provide an EMC testing method for a household treadmill, which is more comprehensive for the EMC testing of the household treadmill.

[0017] The second object of the present invention is to provide a load device used in the EMC test method of the household treadmill, which will not interfere with the EMC test and is more suitable for the EMC test of the treadmill.

[0018] The first object of the present invention is achieved by the following technical solutions:

[0019] An EMC test method for a household treadmill, characterized by comprising the following steps:

[0020] S1, place the treadmill under test on an insulating board and arrange it in the corresponding test environment;

[0021] S2, adding a set load to the test treadmill through a non-metallic load device;

[0022] S3, turning on the treadmill under test and adjusting the running speed to half of the maximum running speed of the treadmill under test until it runs stably;

[0023] S4, adjusting the running speed of the treadmill to the lowest running speed to obtain data at low speed;

[0024] S5, adjusting the running speed of the treadmill to half of the maximum running speed, and obtaining data at half speed;

[0025] S6, adjusting the running speed of the treadmill to the maximum running speed to obtain data at high speed.

[0026] The method for increasing the set load for the test treadmill in step S2 is: when 60% of the rated maximum load-bearing capacity of the test treadmill is equal to or greater than 70kg, the load is adjusted to 60% of the rated maximum load-bearing capacity of the test treadmill; when 60% of the rated maximum load-bearing capacity of the test treadmill is less than 70kg, the load is adjusted to 70kg.

[0027] A further technical solution of the present invention is that the treadmill under test is connected to an external AC power source through an artificial power network.

[0028] A further technical solution of the present invention is that the distance between the tested treadmill and the artificial power network is equal to 1.0±0.1m.

[0029] A further technical solution of the present invention is that a filter is provided between the industrial power supply network and the external AC power supply.

[0030] A further technical solution of the present invention is that the thickness of the insulating board is 0.1 m.

[0031] The second object of the present invention is achieved by the following technical solutions:

[0032] A load device used in the EMC test method for a household treadmill, characterized in that all components of the load device are non-metallic, including a support frame, a load bracket, a weight adjustment assembly and a roller. The support frame is provided with a crossbar, the crossbar is provided with a vertical sliding hole, a vertical upward sliding bar is provided on the top of the load bracket, the sliding bar movably passes through the sliding hole, the roller is rotatably arranged under the load bracket, the roller is used to press on the treadmill under test, the weight adjustment assembly is arranged on the load bracket, and the load weight pressed by the roller on the treadmill under test can be adjusted by adjusting the weight adjustment assembly.

[0033] A further technical solution of the present invention is that two rubber springs are vertically downwardly arranged below the load bracket, the roller is located between the two rubber springs, and the two ends of the rotating shaft in the middle of the roller are respectively rotatably connected to the lower ends of the rubber springs.

[0034] A further technical solution of the present invention is that the weight adjustment assembly includes two groups of barbell plates, a load rod is provided in the middle of the load bracket, and the two groups of barbell plates are respectively installed at both ends of the load rod.

[0035] A further technical solution of the present invention is that the support frame includes supporting feet located on both sides and a crossbeam connecting the upper ends of the supporting feet on both sides together, and the crossbar is arranged below the crossbeam.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. The EMC test method for a household treadmill of the present invention provides a more comprehensive and standardized test process, which adds a set load to the treadmill under test and tests the EMC characteristics at the lowest operating speed, half speed (half the maximum operating speed), and maximum operating speed respectively, making the test more rigorous and scientific.

[0038] 2. All components of the load device of the present invention are non-metallic and will not interfere with the EMC test, and are more suitable for use in the EMC test of a treadmill.

[0039] 3. The load device of the present invention has a simple structure and can be easily transferred by disassembling the load bracket, the load-adjusting assembly and the support frame, so that it can be conveniently moved to different test environments, which is convenient for testers to use and improves the convenience of testing.

[0040] 4. The present invention further connects the rollers through rubber springs, which can play a shock-absorbing role and improve the stability of the load device, while avoiding the impact of using conventional metal springs on EMC testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a structural schematic diagram of a treadmill under test when the EMC test method according to an embodiment of the present invention is used to test the treadmill under test;

[0042] Figure 2 is a schematic structural diagram of a load device according to an embodiment of the present invention;

[0043] Figure 3 is a flowchart of an EMC testing method according to an embodiment of the present invention;

[0044] Figure 4 This is the data change chart obtained when the treadmill is unloaded and running at a speed of 1km;

[0045] Figure 5 This is the data change chart obtained when the treadmill is tested with a load of 60kg and a running speed of 1km;

[0046] Figure 6 This is the data change chart obtained when the treadmill is unloaded and running at a speed of 6km;

[0047] Figure 7 This is the data change chart obtained when the treadmill is tested with a load of 60kg and a running speed of 6km;

[0048] Figure 8 This is the data change chart obtained when the treadmill is unloaded and running at a speed of 12km;

[0049] Fig. 9 This is the data change chart obtained when the treadmill is tested with a load of 60kg and a running speed of 12km.

[0050] Meaning of reference numerals in the figure:

[0051] 1-computer; 2-measurement receiver; 3-artificial power network; 4-filter; 5-AC power supply; 6-test treadmill; 7-insulation board; 8-load device; 801-support frame; 802-slide bar; 803-cross bar; 804-barbell plate; 805-load rod; 806-load bracket; 807-roller; 808-rubber spring; 809-support foot; 810-cross beam; 811-triangular support seat. DETAILED DESCRIPTION

[0052] The present invention is further described below in conjunction with embodiments.

[0053] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0054] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0055] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0056] Example:

[0057] like Figure 3 As shown, the EMC test method for a household treadmill in this embodiment includes the following steps:

[0058] S1, such as Figure 1 As shown, the test treadmill 6 is placed on an insulating board 7 and arranged in a corresponding test environment; wherein the thickness of the insulating board 7 is 0.1 m, and the test environment is the shielding room, darkroom, anti-interference room and other test environments mentioned in the background technology.

[0059] The tested treadmill 6 is connected to an external AC power supply 5 through an artificial power network 3 and a filter 4, and the artificial power network 3 is also connected to a computer 1 through a measuring receiver 2. The artificial power network 3 is mainly used to provide stable impedance and isolate external interference, and transmit the interference signal of the tested treadmill to the measuring receiver 2. The distance between the tested treadmill 6 and the artificial power network 3 is equal to 1.0±0.1m. The filter 4 is used to isolate the mutual interference between the tested device and the power grid. The artificial power network 3 of the present embodiment is a V-shaped artificial power network. The measuring receiver 2 is responsible for receiving and processing test data, and the computer 1 is responsible for processing test data, and drawing a test result diagram according to the standard limit value and outputting the test data.

[0060] S2, adding a set load to the test treadmill 6 through a non-metallic load device 8, which can avoid interference with the EMC test.

[0061] The above-mentioned load refers to the weight pressed on the running belt of the treadmill. The specific method of increasing the set load is: when 60% of the rated maximum load of the tested treadmill 6 is equal to or greater than 70kg, the load is adjusted to 60% of the rated maximum load of the tested treadmill 6; when 60% of the rated maximum load of the tested treadmill 6 is less than 70kg, the load is adjusted to 70kg (70kg is the average weight of adults published in the "National Physical Fitness Monitoring Bulletin" of the State Sports General Administration). The purpose of increasing the set load is to examine the typical state of the treadmill during normal operation.

[0062] S3, turning on the treadmill 6 to be tested, and adjusting the running speed of the treadmill 6 to half of the maximum running speed of the treadmill 6 to run stably, that is, the treadmill 6 to be tested runs at a constant speed;

[0063] S4, adjusting the running speed of the treadmill 6 to the lowest running speed to obtain test data at low speed;

[0064] S5, adjusting the running speed of the treadmill 6 to half of the maximum running speed, and obtaining test data at half speed;

[0065] S6, adjusting the running speed of the treadmill 6 to the maximum running speed to obtain the test data at high speed.

[0066] When testing the above EMC test method, the validity of the treadmill 6 to be tested should be checked first to see if it is within the calibration validity period. It can be used for testing only after confirmation. At the same time, the maximum operating speed, minimum operating speed and rated maximum load of the treadmill 6 to be tested should be obtained according to the instructions, nameplate and other information provided by the manufacturer.

[0067] Since there are many items in the EMC test of the treadmill 6 under test, in steps S4, S5 and S6, different items will use different conventional data acquisition equipment to obtain different test data. In this embodiment, taking the conducted disturbance test item as an example, the test data obtained is generally the frequency domain characteristics of the voltage and current of the treadmill 6 under test, and the data acquisition equipment is the measurement receiver 2, the artificial power network 3, and the matching radio frequency switch, attenuator, and filter.

[0068] The above EMC test method uses typical weights to perform multi-speed tests to examine the impact of different speeds on the EMC characteristics of the treadmill to the greatest extent. It meets the requirement of the standard that "the EUT should be tested under all relevant operating modes and load conditions of its intended use", increases the rigor of the test, and examines the performance of the product more comprehensively.

[0069] In the above EMC test method, the treadmill 6 under test is tested under load, which is more in line with the actual use situation.

[0070] like Figure 2 The load device 8 used in the EMC test method for a household treadmill according to this embodiment is shown, which includes a support frame 801, a load bracket 806, a weight adjustment assembly and a roller 807, all of which are non-metallic.

[0071] The support frame 801 includes support legs 809 on both sides, a crossbeam 810 connecting the upper ends of the support legs 809 on both sides, and a crossbar 803 fixed below the crossbar 810, and two vertical sliding holes are provided on the crossbar 803. Below the support legs 809 is a triangular support seat 811, which provides more stable support. The support frame 801 acts as a fixing device to prevent the device from tilting and tipping over during use, and ensures that the roller 807 will not fall off the running belt of the treadmill during the test.

[0072] Two vertical upward slide bars 802 are arranged on the load bracket 806. The load bracket 806 is located below the cross bar 803. The slide bars 802 are correspondingly inserted into the slide holes. The load bracket 806 can move freely up and down. The load bracket 806 can be directly separated from the support frame 801 up and down to achieve quick disassembly. A horizontal load bar 805 is arranged in the middle of the load bracket 806. The two ends of the load bar 805 extend from the two ends of the load bracket 806.

[0073] The weight adjustment assembly includes two groups of barbell plates 804, each group includes a plurality of barbell plates 804, and a sleeve hole is provided in the middle of the barbell plates 804. The barbell plates 804 are sleeved on the ends of the load rod 805 through the sleeve hole to achieve the installation of the barbell plates 804. By adjusting the number of barbell plates at both ends of the load rod 805, the load weight of the roller 807 pressed on the test treadmill 6 can be adjusted. Conventional buckles can also be provided at both ends of the load rod 805, and the barbell plates 804 can be better locked to the ends of the load rod 805 through the buckles. The weight of the barbell plates 804 at both ends of the load rod 805 of this embodiment can be adjusted in multiple weight levels between 1-50kg.

[0074] In this embodiment, two rubber springs 808 are vertically downwardly arranged below the load bracket 806, and the roller 807 is located between the two rubber springs 808. A rotating shaft is arranged in the middle of the roller 807, and the two ends of the rotating shaft are respectively installed in cooperation with the shaft holes at the lower ends of the rubber springs 808 to achieve a rotating connection. During the test, the roller 807 is used to press on the running belt of the treadmill 6 to increase the load on the treadmill 6.

[0075] Among them, the materials of the support frame 801, the load bracket 806, the slide bar 802, the load rod 805, and the roller 807 can be wood, plastic or lipid materials, etc. The preferred structure of the barbell plate 804 is: the inside is filled with concrete and the outside is wrapped with a rubber layer.

[0076] When the above-mentioned load device 8 is in use, the treadmill 6 to be tested will be placed between the legs 809 on both sides and below the load bracket 806, and the roller 807 will be pressed on the middle position of the running belt of the treadmill, and the weight of the load bracket 806 will be adjusted to the weight required for the test by adjusting the number of barbell plates 804. The load device 8 of this embodiment has a simple structure, and the load bracket 806, the load-adjusting assembly and the support frame 801 can be easily disassembled and transferred, so that it is convenient to move to different test environments, which is convenient for test personnel to use and improves the convenience of the test.

[0077] The above embodiments of the present invention are not intended to limit the protection scope of the present invention, and the implementation modes of the present invention are not limited thereto. All other modifications, replacements or changes made to the above structures of the present invention based on the above contents of the present invention, in accordance with common technical knowledge and customary means in the art, without departing from the above basic technical ideas of the present invention, should fall within the protection scope of the present invention.

Claims

1. An EMC test method for a household treadmill, characterized in that: The following steps are involved: S1, place the treadmill under test on an insulating board and arrange it in the corresponding test environment; S2, adding a set load to the test treadmill through a non-metallic load device; S3, turning on the treadmill under test and adjusting the running speed to half of the maximum running speed of the treadmill under test until it runs stably; S4, adjusting the running speed of the treadmill to the lowest running speed to obtain data at low speed; S5, adjusting the running speed of the treadmill to half of the maximum running speed, and obtaining data at half speed; S6, adjusting the running speed of the treadmill to the maximum running speed to obtain data at high speed.

2. The EMC testing method for a household treadmill according to claim 1, characterized in that: The method for increasing the set load for the test treadmill in step S2 is: when 60% of the rated maximum load-bearing capacity of the test treadmill is equal to or greater than 70kg, the load is adjusted to 60% of the rated maximum load-bearing capacity of the test treadmill; when 60% of the rated maximum load-bearing capacity of the test treadmill is less than 70kg, the load is adjusted to 70kg.

3. The EMC testing method for a household treadmill according to claim 1, characterized in that: The tested treadmill is connected to an external AC power source via an artificial power network.

4. The EMC testing method for a household treadmill according to claim 3, characterized in that: The distance between the tested treadmill and the artificial power network is equal to 1.0±0.1m.

5. The EMC testing method for a household treadmill according to claim 3, characterized in that: A filter is provided between the industrial power supply network and the external AC power supply.

6. The EMC testing method for a household treadmill according to claim 1, characterized in that: The thickness of the insulating plate is 0.1 m.

7. A load device used in the EMC test method of a household treadmill according to any one of claims 1 to 6, characterized in that: All parts of the load device are non-metallic, and include a support frame, a load bracket, a weight adjustment assembly and a roller. The support frame is provided with a cross bar, and the cross bar is provided with a vertical sliding hole. A vertical upward sliding bar is provided on the top of the load bracket, and the sliding bar is movably inserted into the sliding hole. The roller is rotatably arranged under the load bracket, and the roller is used to press on the treadmill to be tested. The weight adjustment assembly is arranged on the load bracket, and the load weight pressed by the roller on the treadmill to be tested can be adjusted by adjusting the weight adjustment assembly.

8. The load device according to claim 7, characterized in that: Two rubber springs extending vertically downward are arranged below the load bracket, the roller is located between the two rubber springs, and the two ends of the rotating shaft in the middle of the roller are respectively rotatably connected to the lower ends of the rubber springs.

9. The load device according to claim 7, characterized in that: The load-adjusting assembly comprises two groups of barbell plates, a load rod is provided in the middle of the load bracket, and the two groups of barbell plates are respectively mounted at two ends of the load rod.

10. The load device according to claim 7, characterized in that: The support frame comprises supporting feet on both sides and a crossbeam connecting the upper ends of the supporting feet on both sides together, and the crossbar is arranged below the crossbeam.

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