A durability testing method and device for automatic cord reel of household appliances

Abstract

The durability test method of the automatic cord reel of household appliances provided by the present invention is as follows: according to the set speed and stroke, the driving motor drives the connected cord reel to operate, and the power cord is pulled onto the cord reel by the steel wire rope; at the end of the stroke, the motor stops, and the automatic cord reel retracts the power cord; then according to the set number of times, the driving motor is repeatedly driven to drive the cord reel to operate and pull out the power cord; when it is found according to the stroke signal that the power cord is entangled and the automatic cord reel fails to be fully retracted, the driving motor is paused, and the clamping cylinder of the steel wire rope and the telescopic cylinder used for towing are started to eliminate the entanglement of the power cord; then according to the stroke position signal, it is detected whether the entanglement of the power cord is eliminated, and if it is still not eliminated, the action of eliminating the entanglement of the power cord is repeated; if it has been eliminated, the driving motor is turned on to repeat the test steps. The present invention can test the automatic cord reel strictly according to the counting requirements of speed, length, angle, number of times, etc. specified in different standards, so as to ensure the accuracy of the test and have good versatility.

Description

Technical Field

[0001] The invention relates to the technical field of a durability testing method and device for an automatic wire reel. Background Art

[0002] The automatic cord reel for household appliances is a structure commonly used in household appliances such as vacuum cleaners, carpet and floor cleaning equipment to store power cords. Its durability is an important safety and quality indicator. According to the requirements of IEC 60335-1:2010, EN 60335-1:2012, UL 1017, Eighth Edition, Dated September 10, 2010, CSA C22.2No. 243-10, GB 4706.1-2005 and other standards, when testing the durability of the automatic cord reel, it is necessary to establish a device that drives the power cord to pull out and retract reciprocating motion to simulate its working state in actual use.

[0003] The equipment currently used to test the durability of automatic wire reels has the following defects:

[0004] a. During the test, it is not possible to detect whether the automatic cord reel is fully retracted, which has a great impact on the accuracy of the test results. During the test, due to the irregularity of the power cord being reeled on the reel shaft, the power cord often crosses and overlaps, causing the automatic cord reel to be unable to be fully retracted. Currently, common automatic cord reel test devices cannot automatically check whether the automatic cord reel is fully retracted. The test equipment continues to pull out the power cord, causing the stretching stroke to not meet the standard requirements, and the endurance times cannot be accurately recorded, affecting the accuracy of the test results.

[0005] b. Poor versatility, and cannot be used for tests specified in IEC 60335-1:2010, EN 60335-1:2012, UL 1017, Eighth Edition, Dated September 10, 2010, CSA C22.2 No. 243-10, GB 4706.1-2005 and other standards. Different standards have different requirements for the test of automatic cable reels, such as the pull-out angle, pull-out length, speed and number of times. Currently, the common automatic cable reel test equipment does not fully consider the difference requirements of the standards, and requires major changes when testing according to different standards, and even cannot implement different standard tests in the same set of equipment.

[0006] c. Low degree of automation. When the automatic wire reel cannot be fully retracted, the tester needs to manually stop the machine for adjustment, which increases the tester's workload and prolongs the test cycle. When the automatic wire reel cannot be fully retracted, the current common automatic wire reel test device cannot eliminate the problem by itself. It completely relies on the tester's visual inspection and needs the tester to manually stop the machine for adjustment. When the frequency of failure to fully retract occurs frequently, the tester needs to increase the number of observations and stop the machine for adjustment multiple times, which prolongs the test cycle.

[0007] Therefore, the method and device for testing the automatic cord reel of household appliances need to be further improved. Summary of the invention

[0008] The purpose of the present invention is to solve the above-mentioned defects of the prior art and provide an automated testing method that can detect whether an automatic cable reel is fully retracted.

[0009] Another object of the present invention is to provide a household appliance automatic cord reel testing device which can automatically pull out and retract the power cord in the cord reel to perform reciprocating motion.

[0010] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0011] A durability testing method for an automatic cord reel of a household appliance comprises the following steps:

[0012] (1) Fix the household appliance sample to be tested, pull out a section of the power cord and fix it on the wire rope;

[0013] (2) Set the test speed, stroke and number of times;

[0014] (3) The driving motor drives the connected winding wheel to rotate according to the set speed and stroke, and the power cord is pulled onto the winding wheel through the wire rope; when the stroke ends, the motor stops, and the automatic winding device on the household appliance sample retracts the power cord; then, the driving motor drives the winding wheel to rotate to pull out the power cord and the automatic winding device retracts the power cord, repeating the reciprocating action of the driving motor driving the winding wheel to rotate to pull out the power cord and the automatic winding device to retract the power cord according to the set number of times;

[0015] (4) When it is found according to the stroke signal that the power cord is entangled and the automatic reel cannot be fully retracted, the drive motor is paused, and the clamping cylinder of the wire rope and the telescopic cylinder used for towing are started to eliminate the tangle of the power cord; then, according to the stroke position signal, it is detected whether the tangle of the power cord is eliminated. If it is still not eliminated, the action of eliminating the tangle of the power cord is repeated; if it is eliminated, the drive motor is turned on to continue step (3).

[0016] Furthermore, the steps (2) and (3) are set on a controller connected to the drive motor, the distance sensor, the clamping cylinder and the telescopic cylinder.

[0017] A durability testing device for an automatic wire reel of a household appliance comprises a sample fixture, a driving motor, a winding wheel, a guiding device, an upper distance sensor, a lower distance sensor and a controller arranged on a frame, wherein the rotating shaft of the driving motor is connected to the central axis of the winding wheel, the winding wheel is provided with a wire rope, the guiding device comprises an angle adjuster, an angle guide rod and a vertical guide rod, the angle adjuster is movably connected to the lower part of the angle guide rod; part of the wire rope is arranged in the angle guide rod and the vertical guide rod, the distance sensor is fixed on the vertical guide rod, and the controller is respectively connected to the driving motor, the angle adjuster, the upper distance sensor and the lower distance sensor.

[0018] Furthermore, the durability test device for the automatic cord reel of household appliances also includes a clamping cylinder and a telescopic cylinder for dragging, the clamping cylinder and the telescopic cylinder are fixed on the guide device, the clamping cylinder and the telescopic cylinder are respectively connected to the controller, and when the controller receives the abnormal stroke signal of the upper distance sensor and the lower distance sensor and finds that the power cord of the sample cord reel cannot be fully retracted, the power cord is tangled. Furthermore, the clamping cylinder and the telescopic cylinder are fixed on the vertical guide rod of the guide device.

[0019] Furthermore, the sample clamp includes a column, a horizontal connecting rod, a first locking piece, a second locking piece, a pressing piece, a first slider and a second slider. The column is fixed to the frame by bolts; the horizontal connecting rod is movably connected to the column through the first slider and is fixed to the column through the first locking piece; the pressing piece is movably connected to the horizontal connecting rod through the second slider and is fixed to the horizontal connecting rod through the second locking piece.

[0020] Furthermore, the winding wheel is arranged below the vertical guide rod.

[0021] Beneficial effects of the present invention:

[0022] Existing household appliance cord reel testing methods and testing equipment cannot be applied to tests of different standards, cannot detect whether the automatic cord reel is fully retracted, require on-site observation and adjustment by testers, and have many test pauses, which is very labor-intensive for testers. The testing method and device provided by the present invention can test the automatic cord reel in strict accordance with the counting requirements of speed, length, angle, number of times, etc. specified in different standards, thereby ensuring the accuracy of the test; and can implement testing according to different requirements of multiple standards on the same set of testing equipment, thereby improving the versatility of the equipment.

[0023] At the same time, the device of the present invention has a high degree of automation, and can automatically adjust the automatic wire reel in response to the possible situation that the automatic wire reel cannot be fully retracted during the experiment, thereby ensuring the accuracy of the test and reducing the workload of the tester.

[0024] From the perspective of practical application, the method and device for testing automatic cord reels for household appliances of the present invention have raised the technical appraisal of my country's household appliances exported to the United States, Europe and sold domestically to a certain level, because such products are tested in full accordance with international and national standards, the safety technology level of domestic household appliance manufacturers has been improved, and the unqualified rate of random inspections of my country's products in domestic and foreign markets has been greatly reduced, indirectly increasing my country's ability to earn foreign exchange through exports.

[0025] The present invention can make a correct evaluation of the product at the first time, greatly shortening the preparation time for domestic home appliance manufacturers to export and sell their products domestically, and gaining an active position for domestic home appliance manufacturers in sales in the domestic and international markets. Its brand effect is very obvious, and the safety level of my country's home appliance products in the domestic and international markets is well proven. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the planar structure of a durability testing device for an automatic cord reel of a household appliance according to the present invention.

[0027] Description of reference numerals:

[0028] 1 Sample fixture 101 Column 102 Horizontal connecting rod 103 First locking piece 104 Second locking piece 105 Pressing piece

[0029] 106 first slider 107 second slider

[0030] 2. Drive Motor

[0031] 3 reel 301 wire rope

[0032] 4 guide device 401 angle adjuster 402 angle guide rod 403 vertical guide rod

[0033] 5 Rack

[0034] 6 Controller

[0035] 7 Upper distance sensor

[0036] 8 Lower distance sensor

[0037] 9 Clamping cylinder

[0038] 10 Telescopic cylinder DETAILED DESCRIPTION

[0039] like Figure 1As shown, the durability testing device for the automatic wire reel of household appliances provided by the present invention comprises a sample fixture 1, a driving motor 2, a wire reel 3, a guide device 4, an upper distance sensor 7, a lower distance sensor 8, a controller 6, a clamping cylinder 9 and a telescopic cylinder 10 for dragging, the rotating shaft of the driving motor 2 is connected to the central axis of the wire reel 3, the wire reel 3 is provided with a wire rope 301, the guide device 4 comprises an angle adjuster 401, an angle guide rod 402 and a vertical guide rod 403, the angle adjuster (401) and the angle guide rod (402) are connected to each other. ) is movably connected to the lower part; the winding wheel 3 is arranged below the vertical guide rod 403, and the wire rope 301 passes through the vertical guide rod 403 and enters the angle guide rod 402. Therefore, part of the wire rope 301 is arranged inside the vertical guide rod 403 and the angle guide rod 402, the upper distance sensor 7 and the lower distance sensor 8 are respectively fixed on the vertical guide rod 403, the clamping cylinder 9 and the telescopic cylinder 10 are fixed on the guide device 4, and the controller 6 is respectively connected to the drive motor 2, the angle adjuster 401, the upper distance sensor 7, the lower distance sensor 8, the clamping cylinder 9 and the telescopic cylinder 10. When the controller 6 receives the stroke abnormality signal of the upper distance sensor 7 and the lower distance sensor 8 and finds that the power cord of the sample reel cannot be fully retracted, the clamping cylinder 9 is started to fix the power cord, and the telescopic cylinder 10 is started to pull the power cord to eliminate the entanglement of the power cord.

[0040] The sample fixture 1 comprises a column 101, a horizontal connecting rod 102, a first locking member 103, a second locking member 104, a pressing member 105, a first slider 106 and a second slider 107. The column 101 is fixed to the frame 5 by bolts; the horizontal connecting rod 102 is movably connected to the column 101 by the first slider 106 and is fixed to the column 101 by the first locking member 103; the pressing member 105 is movably connected to the horizontal connecting rod 102 by the second slider 107 and is fixed to the horizontal connecting rod 102 by the second locking member 104. The horizontal connecting rod 102 is rotated by the lifting plane of the first slider 106 and is locked by the first locking member 103. The pressing member 105 moves along the horizontal connecting rod 102 by the second slider 107 and presses the sample and is locked by the second locking member 104.

[0041] During the test,

[0042] (1) The household appliance sample to be tested is fixed between the pressure seat and the base of the sample fixture, and the end of the power cord pulled out is fixed on the wire rope 301 of the winding reel 3. The wire rope 301 is dragged to the automatic winding device of the test sample through the guide device 4. The winding reel 3 is used to wind the wire rope 301.

[0043] (2) The test speed, stroke, angle and number of times can be set through the controller panel, and the test can be started or stopped manually.

[0044] The real-time speed and number of times the steel wire rope is pulled out of the power line are controlled by the controller 6, and it can judge whether the test fails.

[0045] (3) According to the set speed, stroke and number of times, the drive motor drives the reel to operate after receiving the signal from the controller, and the wire rope pulls the power cord to make reciprocating motion;

[0046] (4) If the power cord is tangled and the automatic cord reel cannot be fully retracted, the controller will suspend the original set action according to the position signal obtained by the travel switch, and pull the clamping cylinder of the wire rope and the telescopic cylinder used for pulling to eliminate the tangle of the power cord. Then, according to the position signal obtained by the travel switch, it will be detected whether the tangle of the power cord has been eliminated. If it has not been eliminated, the elimination action will be repeated; if it has been eliminated, the remaining actions of the original setting will continue.

[0047] The working principle of the durability testing device for the automatic cord reel of household appliances of the present invention is as follows:

[0048] According to the requirements of the standard, the power cord on the automatic cord reel is pulled out at the speed specified by the standard, and the power cord is automatically retracted by relying on the pulling force of the winding spring of the automatic cord reel.

[0049] The servo motor is used to drive the wire rope turntable to rotate forward and reverse at a certain rotation speed. When rotating forward, the wire rope on the turntable pulls the power cord of the automatic reel. The pulling length is set according to the standard and realized by the positioning device. When reversing, if the reel reel recovery speed is less than the wire rope turntable linear speed, there is a natural swinging space at the outlet of the wire rope reel for storing and straightening the wire rope, so that the reel can rewind at its recovery speed. If the reel retracts faster than the wire rope turntable linear speed, it will pull the reel and return at the speed of the wire rope turntable.

[0050] If the power cord on the automatic cord reel cannot be fully retracted, the distance sensor can detect this situation. At this time, the servo motor stops pulling out the power cord, and the counter on the controller automatically stops counting accordingly, thereby avoiding insufficient stretching stroke affecting the accuracy of the test.

[0051] The servo motor can be set to different speeds according to the standards to correspond to the stretching rates of different standards; the height of the wire rope turntable (winding wheel 3) is adjustable, and the position of the test sample on the fixed platform can be adjusted forward and backward to correspond to the stretching angles and lengths of different standards; the number of tests can be set through the controller on the device and intuitively displayed by the built-in electronic counter.

[0052] When the power cord on the automatic cord reel cannot be fully retracted, the test device of the present invention can automatically perform short-distance pulling adjustment to fully retract the power cord to trigger the positioning device and continue the test. The test device automatically completes the detection, adjustment, and continued testing without manual operation by the tester.

Claims

1. A durability testing method for an automatic cord reel for household appliances, comprising the following steps: (1) Fix the household appliance sample to be tested on the fixture of the household appliance automatic cord reel durability test device, then pull out a section of the power cord and fix it on the wire rope; (2) Set the test speed, stroke and number of times according to the required standards; (3) The driving motor drives the connected winding wheel to rotate according to the set speed and stroke, and the power cord is pulled onto the winding wheel through the wire rope; when the stroke ends, the motor stops, and the automatic winding device on the household appliance sample retracts the power cord; then, the driving motor drives the winding wheel to rotate to pull out the power cord and the automatic winding device retracts the power cord, repeating the reciprocating action of pulling out the power cord and retracting the power cord according to the set number of times; The above steps (2) and (3) are set on a controller connected to the drive motor, the distance sensor, the clamping cylinder and the telescopic cylinder; (4) When it is found according to the stroke signal that the power cord is entangled and the automatic cord reel cannot be fully retracted, the drive motor is stopped, and the clamping cylinder of the wire rope and the telescopic cylinder used for towing are started to eliminate the tangle of the power cord; then, according to the stroke position signal, it is detected whether the tangle of the power cord is eliminated. If it is still not eliminated, the action of eliminating the tangle of the power cord is repeated; if it is eliminated, the drive motor is turned on to continue step (3); The durability testing device for an automatic wire reel for household appliances comprises a sample fixture (1), a drive motor (2) and a wire reel (3) arranged on a frame (5), and is characterized in that: The invention also comprises a guide device (4), an upper distance sensor (7), a lower distance sensor (8), a controller (6), a clamping cylinder (9) and a telescopic cylinder (10) for pulling. The rotating shaft of the driving motor (2) is connected to the central axis of the winding wheel (3). The winding wheel (3) is provided with a steel wire rope (301). The guide device (4) comprises an angle adjuster (401), an angle guide rod (402) and a vertical guide rod (403). The angle adjuster (401) is movably connected to the lower part of the angle guide rod (402). Part of the steel wire rope (301) is arranged in the vertical guide rod (403) and the angle guide rod (402); the upper distance sensor (7) and the lower distance sensor (8) are fixed on the vertical guide rod (403); the controller (6) is respectively connected to the drive motor (2), the angle adjuster (401), the upper distance sensor (7) and the lower distance sensor (8); the clamping cylinder (9) and the telescopic cylinder (10) are fixed on the guide device (4); and the clamping cylinder (9) and the telescopic cylinder (10) are respectively connected to the controller (6).

2. The durability testing method for an automatic cord reel for household appliances as claimed in claim 1, characterized in that: The sample clamp (1) comprises a column (101), a transverse connecting rod (102), a first locking piece (103), a second locking piece (104), a pressing piece (105), a first sliding block (106) and a second sliding block (107); the column (101) is fixed to the frame (5) by bolts; the transverse connecting rod (102) is movably connected to the column (101) by the first sliding block (106) and is fixed to the column (101) by the first locking piece (103); the pressing piece (105) is movably connected to the transverse connecting rod (102) by the second sliding block (104) and is fixed to the transverse connecting rod (102) by the second locking piece (104).

3. The durability testing method for an automatic cord reel for household appliances as claimed in claim 2, characterized in that: The height of the reel (3) is adjustable.

4. The durability testing method for an automatic cord reel for household appliances as claimed in claim 2, characterized in that: The position of the test sample on the fixed platform can be adjusted forward and backward.

5. The durability testing method for an automatic cord reel for household appliances as claimed in claim 2, characterized in that: The winding wheel (3) is arranged below the vertical guide rod (403).

6. The durability testing method for an automatic cord reel for household appliances as claimed in claim 3, characterized in that: The clamping cylinder (9) and the telescopic cylinder (10) are fixed on the vertical guide rod (403) of the guide device (4).

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