CN108225758B - Testing method and control system of refrigerator door opening and closing fatigue testing machine - Google Patents
Testing method and control system of refrigerator door opening and closing fatigue testing machine Download PDFInfo
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- CN108225758B CN108225758B CN201810064561.6A CN201810064561A CN108225758B CN 108225758 B CN108225758 B CN 108225758B CN 201810064561 A CN201810064561 A CN 201810064561A CN 108225758 B CN108225758 B CN 108225758B
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Abstract
A refrigerator door opening and closing fatigue testing machine testing method and a control system thereof relate to the field of fatigue testing machines, and comprise a sensor used for detecting the position of a refrigerator door; the timing module is connected with the sensor and used for calculating the time interval between two touch signals; a CPU; the counting module is respectively connected with the comparing module and the CPU, carries out accumulation technology when receiving counting signals and inputs counting results into the CPU; the driving module is used for driving the door to be opened, the door pushing frequency of the equipment is recorded through the CPU, and if the door body can automatically return and collide with the trigger origin proximity switch, the experiment continues. If the door body does not return within a certain time and collides with the trigger proximity switch, the experiment is finished, and an alarm is sent out, so that the effect of automatically testing the fatigue resistance of the door is achieved.
Description
Technical Field
The invention relates to the field of fatigue testing machines, in particular to a testing method and a control system of a refrigerator door opening and closing fatigue testing machine.
Background
The refrigerator door can be automatically closed after being opened, the refrigerator door can show the quality of the fatigue performance of the automatic closing of the refrigerator door only by long-time use after the refrigerator door is installed, and the refrigerator door does not have a fatigue performance detection device corresponding to the refrigerator door at the present stage, so that the fatigue resistance degree of the refrigerator door does not form a standard fatigue resistance value standard.
Disclosure of Invention
The invention aims to provide a testing method and a control system of a refrigerator door opening and closing fatigue testing machine.
The technical purpose of the invention is realized by the following technical scheme:
a testing method of a refrigerator door opening and closing fatigue testing machine comprises the following steps:
and S1, driving the motor to work to drive the rollers at the edge of the turntable to push the door to open.
S2, when the box door is opened to a certain angle, the cylinder at the bottom end of the roller contracts to enable the position of the roller to descend, the box door is automatically closed under the acting force of the rotating shaft spring, and when the box door returns to the original position, the sensor touches the sensor, and the sensor sends out a timing signal.
S3, the timing module calculates the time interval between two timing signals and outputs a time interval signal;
s4, through presetting a time interval reference value and comparing the time interval reference value with the time interval signal, entering S5 when the time interval is smaller than the time interval reference value, and entering S6 when the time interval is larger than the time interval reference value;
s5, the counting module counts the times of the door touching the sensor in an accumulating way, outputs the counting information to the upper computer through the CPU for displaying, and simultaneously enters S1 to start circulation;
and S6, outputting the last counting result and controlling the motor to stop working after the test is finished.
Through the technical scheme, driving motor can drive the rolling disc when rotating and rotate, the gyro wheel at rolling disc edge can promote the chamber door and open, automatic recovery normal position under the effect of pivot spring after the chamber door is opened, touch the sensor and send timing signal when the chamber door returns the normal position, timing module judges whether the chamber door is qualified through the time interval of calculating between the both sides timing signal, prove that the chamber door opens and shuts fatigue degree in normal range when the chamber door returns the normal position within the time of predetermineeing, the counter adds up the technique to timing signal, do not touch the sensor within the time of predetermineeing when the chamber door, prove that the chamber door opens and shuts fatigue degree and surpasss normal range, the test ends, the counter outputs the last count result, with this test chamber door effectively opens and shuts the maximum number of times.
The invention is further configured to: the CPU controls the rotating speed of the driving motor through the frequency converter, when the air cylinder contracts to drive the roller to descend, the motor rotates in an accelerating mode, the rotating disc rotates to the original point rapidly, and then the initial speed is changed to carry out next door pushing.
Through the technical scheme, the CPU controls the rotating speed of the driving motor through the frequency converter, so that the rotating disc can be located at the initial position to push the box door to be opened when the box door is restored, seamless connection is realized, and the testing efficiency and the testing accuracy are improved.
A refrigerator door body opening and closing fatigue testing machine testing system comprises
The sensor is used for detecting the position of the box door and outputting a touch signal when the box door touches the sensor;
the timing module is connected with the sensor and used for calculating the time interval between two touch signals;
CPU, is used for data handling and logical operation;
the comparison module is connected with the timing module, a time interval preset value is set in the CPU, the comparison module compares a time interval signal with a preset time interval value, an end signal is output when the time interval is larger than the preset value, and a counting signal is output when the time interval is smaller than the preset value;
the counting module is respectively connected with the comparison module and the CPU, and carries out accumulation technology when receiving counting signals and inputs counting results into the CPU;
the upper computer is used for sending a control command to the CPU and displaying the working state;
and the driving module is used for driving the door to open.
According to the technical scheme, the sensor is used for detecting the position of the box door, the timing module can record the time for the box door to return to the original position and transmit data to the CPU, the CPU analyzes and calculates the time, an end signal is output when the time interval is larger than a preset value, the time interval is smaller than the preset value and continues to perform cycle test, the counter is used for accumulating and calculating the touch times and sending the counting information to the CPU, the CPU sends the maximum times and the time interval information to the upper computer to be displayed, a user can observe the test state of the equipment visually, the upper computer can also send a control command to the CPU, and the functions of controlling the rotating speed of the motor and changing the preset time.
The invention is further configured to: the sensor is arranged at the position when the box door is closed.
Through the technical scheme, the sensor can be touched when the box door returns to the original position, and a timing signal is sent.
The invention is further configured to: the driving module comprises a driving motor and a frequency converter, and the frequency converter is connected with the CPU and used for controlling the driving motor to rotate.
Through the technical scheme, the frequency converter can adjust the frequency of the motor, and the variable-speed operation of the motor is realized.
The invention is further configured to: the bottom end of the box door is provided with a rotating disc, the middle position of the rotating disc is connected with the driving motor, and the edge of the rotating disc is provided with a pushing assembly used for pushing the box door to open.
Through above-mentioned technical scheme, the rolling disc rotates under driving motor's drive, and the pushing assembly and the chamber door butt of rolling disc edge part push away the chamber door under the drive of carousel, reach the effect of automatic opening chamber door.
The invention is further configured to: the pushing assembly comprises a roller for pushing the box door and an air cylinder arranged at the lower end of the roller and used for controlling the roller to ascend and descend, and a gap for the roller to pass through when the air cylinder contracts is formed between the bottom end of the box door and the rotating disc.
Through above-mentioned technical scheme, the frictional force between the reducible chamber door of gyro wheel and chamber door surface butt and the promotion subassembly avoids causing the mar to the chamber door when pushing away the chamber door, and the cylinder of gyro wheel bottom is controlled by CPU, but the gyro wheel butt chamber door when the cylinder stretches out, and the gyro wheel descends when the cylinder contracts and makes the gyro wheel be located the gap between chamber door base and the rolling disc, makes the chamber door can reply the normal position under the spring force effect of pivot spring.
The invention is further configured to: the cylinder is controlled to stretch and retract through an electric control valve, and the electric control valve is connected with the CPU.
Through above-mentioned technical scheme, thereby the electrically controlled valve can control the break-make control cylinder of cylinder gas circuit flexible, and the electrically controlled valve is controlled by CPU, and the accessible procedure realizes the flexible accurate control to the cylinder, controls the cylinder shrink when the chamber door is opened certain angle, makes the angle that the chamber door was opened every time all equal.
In conclusion, the invention has the following beneficial effects:
according to the invention, the roller at the top of the rotating disc is adopted to push the box door, the opening and closing of the box door are simulated, and the descending of the roller is controlled by the cylinder and the electric control valve at the bottom end of the roller, so that the accurate control of the rotating speed of the cylinder and the motor can be realized, the accurate control of the opening angle of the box door can be realized, the rebound effect of the box door is judged by calculating the time interval between the touch sensors of the box door, the effect of testing the opening and closing fatigue degree of the box door is achieved, and the problem that the fatigue resistance of the box door can be known only by long-time use after the existing box door is installed is solved.
Drawings
FIG. 1 is a schematic view of the overall structure of the fatigue testing machine for the box door;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is an enlarged view of portion B of FIG. 1;
FIG. 4 is a side view of the bin door fatigue tester;
FIG. 5 is a control system block diagram;
fig. 6 is a control system flow chart.
In the figure, 1, a top plate; 11. a column; 12. heightening the motor; 13. adjusting a rod; 2. an adjusting plate; 3. a base; 31. rotating the disc; 32. a cylinder; 33. a roller; 4. a box door; 51. a sensor; 52. a timing module; 53. a CPU; 54. a comparison module; 55. a counting module; 56. an upper computer; 57. a drive module; 571. a drive motor; 6. a control cabinet; 7. a buffer assembly; 71. a buffer rod; 72. a contact portion; 73. a spring.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a refrigerator door opening and closing fatigue testing machine comprises a top plate 1, an adjusting plate 2 and a base 3 which are sequentially arranged from top to bottom, wherein the top plate 1 is fixedly connected with the base 3 through a stand column 11, a rotating disc 31 is arranged on the base 3, and a refrigerator door 4 is arranged between the rotating disc 31 and the adjusting plate 2. The edge of the upper end of the rotating disc 31 is provided with a pushing component for pushing the box door 4 to rotate, and the pushing component is used for simulating the opening and closing of the box door 4. One side of the upper end of the base 3 is provided with a control cabinet 6.
As shown in fig. 4, since the heights of the various doors 4 are different, the adjusting plate 2 is used to adjust the height of the center shaft on the door 4. Adjusting plate 2 cup joints outside stand 11 and rather than sliding connection, 1 upper end of roof is provided with heightening motor 12, heightening motor 12 output end fixed connection adjusts pole 13, adjust pole 13 wear to establish with roof 1 and adjusting plate 2, and adjust pole 13 and adjusting plate 2 contact segment and be provided with the external screw thread, be provided with on adjusting plate 2 with adjust pole 13 complex internal thread, can adjust the distance between adjusting plate 2 and the rolling disc 31 when adjusting motor rotates.
As shown in fig. 1 and 3, the pushing assembly includes a roller 33 for pushing the door 4 and an air cylinder 32 disposed at a lower end of the roller 33 for controlling the roller 33 to ascend and descend, and a gap for the roller 33 to pass through is formed between the lower end of the door 4 and the rotating disc 31 when the air cylinder 32 contracts. The roller 33 abuts against the surface of the box door 4 to reduce the friction between the box door 4 and the pushing component, thereby avoiding scratches on the box door 4 when the box door 4 is pushed open, the roller 33 can abut against the box door 4 when the cylinder 32 extends out, and the roller 33 descends when the cylinder 32 contracts to enable the roller 33 to be positioned in a gap between the bottom edge of the box door 4 and the rotating disc 31, so that the box door 4 can be restored under the elastic force action of the rotating shaft spring 73.
As shown in FIG. 5, a testing system for a fatigue testing machine for opening and closing a door 4 of a refrigerator comprises
A sensor 51, the sensor 51 being provided at a position where the door 4 is closed, the sensor 51 outputting a touch signal when the door 4 touches the sensor 51;
a timing module 52 connected to the sensor 51 for calculating the time interval between two touch signals and transmitting the data to the CPU53 for processing;
a CPU53 for data processing and logical operations;
a comparison module 54 connected to the timing module 52, wherein a preset time interval value is set in the CPU53, the comparison module 54 compares the time interval signal with the preset time interval value, outputs an end signal when the time interval is greater than the preset value, and outputs a count signal when the time interval is less than the preset value;
a counting module 55, which is respectively connected with the comparing module 54 and the CPU53, and when receiving the counting signal, the counting module 55 accumulates the counting number and inputs the counting result into the CPU 53;
the upper computer 56 is used for sending a control command to the CPU53 and displaying the working state; the upper computer 56 can also send a control command to the CPU53 to realize the functions of controlling the motor speed and changing the preset time;
the driving module 57 is configured to drive the box door 4 to open, and the driving module 57 includes a driving motor 571 and a frequency converter, and the frequency converter can control the driving motor 571 to perform variable-speed motion. The driving motor 571 is disposed at the upper end edge of the base 3, and the driving motor 571 drives the rotating disc 31 to rotate through a belt (not shown in the figure).
More specifically, as shown in fig. 1 and 2, the sensor 51 is further provided with a buffer assembly 7 on a side facing the middle position of the rotating disc 31, the buffer assembly 7 includes a buffer rod 71 arranged side by side with the sensor 51, an end of the buffer rod 71 is provided with a contact portion 72 sleeved outside the buffer rod 71, and a spring 73 is arranged between the contact portion 72 and the other end of the buffer rod 71. The position of contact part 72 is longer than sensor 51, when chamber door 4 rotated to sensor 51 one side, chamber door 4 contacted with contact part 72 earlier, and spring 73 is compressed simultaneously, then chamber door 4 contacted sensor 51 again, played the cushioning effect to chamber door 4, avoided the impact force too big to cause the damage to sensor 51, contact part 72 adopts the rubber material simultaneously, has the cushioning effect, can cause the damage to chamber door 4 when striking repeatedly than avoiding chamber door 4, increase its life.
Further, as shown in fig. 5, the electronic control valve is connected with the CPU53 through a communication line, and can accurately control the expansion and contraction of the air cylinder 32 through a program, the electronic control valve controls the on/off of the air passage of the air cylinder 32 to control the expansion and contraction of the air cylinder 32, and when the door 4 is opened to a certain angle, the air cylinder 32 is controlled to contract, so that the opening angles of the door 4 are equal each time.
As shown in fig. 6, based on the control system, the embodiment further provides a method for testing a refrigerator door opening and closing fatigue testing machine, which includes the following steps:
s1, driving the motor 571 to work, and driving the roller 33 at the edge of the turntable to push the box door 4 to open;
s2, when the door 4 is opened to a certain angle, the cylinder 32 at the bottom end of the roller 33 contracts to enable the position of the roller 33 to descend, the door 4 automatically closes under the action of the rotating shaft spring 73, when the door 4 returns to the original position, the door touches the sensor 51, and the sensor 51 sends a timing signal;
s3, the timing module calculates the time interval between two timing signals and outputs a time interval signal;
s4, through presetting a time interval reference value and comparing the time interval reference value with the time interval signal, entering S5 when the time interval is smaller than the time interval reference value, and entering S6 when the time interval is larger than the time interval reference value;
s5, the counting module 55 counts the times of the door 4 touching the sensor 51 in an accumulating way, outputs the counting information to the upper computer 56 through the CPU53 for displaying, and simultaneously enters S1 to start circulation;
and S6, outputting the last counting result and controlling the motor to stop working after the test is finished, and simultaneously sending out an alarm signal.
The driving motor 571 can drive the rotating disc 31 to rotate when rotating, the roller 33 at the edge of the rotating disc 31 can push the box door 4 to open, the box door 4 automatically returns to the original position under the action of the rotating shaft spring 73 after opening, the box door 4 touches the sensor 51 and sends out a timing signal when returning to the original position, the timing module judges whether the box door 4 is qualified or not by calculating the time interval between the timing signals at two sides, when the box door 4 returns to the original position within the preset time, the fatigue degree of the opening and closing of the box door 4 is proved to be within the normal range, the counter carries out the accumulation technology on the timing signal, when the box door 4 does not touch the sensor 51 within the preset time, the fatigue degree of the opening and closing of the box door 4 is proved to be beyond the normal range, the test is finished, and the alarm signal is sent out, and the counter.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (4)
1. A refrigerator door body opening and closing fatigue testing machine testing system comprises
The sensor (51) is used for detecting the touch position of the box door (4), and outputting a touch signal when the box door (4) touches the sensor (51);
the timing module (52) is connected with the sensor (51) and used for calculating the time interval between two touch signals;
a CPU (53) for data processing and logical operation;
the comparison module (54) is connected with the timing module (52), a time interval preset value is arranged in the CPU (53), the comparison module (54) compares a time interval signal with the preset time interval value, an end signal is output when the time interval is larger than the preset value, and a counting signal is output when the time interval is smaller than the preset value;
a counting module (55) which is respectively connected with the comparing module (54) and the CPU (53), and when the counting module (55) receives the counting signal, the counting module carries out the accumulation technology and inputs the counting result into the CPU (53);
the upper computer (56) is used for sending a control command to the CPU (53) and displaying the working state;
the driving module (57) is used for driving the box door (4) to be opened;
the driving module (57) comprises a driving motor (571) and a frequency converter, and the frequency converter is connected with the CPU (53) and is used for controlling the driving motor (571) to rotate; the bottom end of the box door (4) is provided with a rotating disc (31), the middle position of the rotating disc (31) is connected with the driving motor (571), and the edge of the rotating disc (31) is provided with a pushing component for pushing the box door (4) to open; the pushing assembly comprises a roller (33) used for pushing the box door (4) and an air cylinder (32) arranged at the lower end of the roller (33) and used for controlling the roller (33) to ascend and descend, and a gap used for allowing the roller (33) to penetrate when the air cylinder (32) contracts is formed between the bottom end of the box door (4) and the rotating disc (31).
2. The refrigerator door opening and closing fatigue testing machine testing system of claim 1, which is characterized in that: the sensor (51) is arranged at the position when the door (4) is closed.
3. The refrigerator door opening and closing fatigue testing machine testing system of claim 1, which is characterized in that: the cylinder (32) is controlled to extend and retract through an electric control valve, and the electric control valve is connected with the CPU (53).
4. A testing method of a refrigerator door opening and closing fatigue testing machine adopts the testing system of the refrigerator door opening and closing fatigue testing machine according to claims 1-3, and is characterized in that: comprises the following steps
S1, driving the motor (571) to work, and driving the roller (33) at the edge of the turntable to push the box door (4) to open;
s2, when the box door (4) is opened to a certain angle, the cylinder (32) at the bottom end of the roller (33) contracts to enable the position of the roller (33) to descend, the box door (4) automatically closes under the action of the rotating shaft spring (73), when the box door (4) returns to the original position, the box door touches the sensor (51), and the sensor (51) sends a timing signal;
s3, the timing module calculates the time interval between two timing signals and outputs a time interval signal;
s4, through presetting a time interval reference value and comparing the time interval reference value with the time interval signal, entering S5 when the time interval is smaller than the time interval reference value, and entering S6 when the time interval is larger than the time interval reference value;
s5, the counting module (55) counts the times of the door (4) touching the sensor (51) in an accumulating way, outputs counting information to the upper computer (56) through the CPU (53) for displaying, and simultaneously enters S1 to start circulation; the CPU (53) controls the rotating speed of the driving motor (571) through the frequency converter, when the cylinder (32) contracts to drive the roller (33) to descend, the motor rotates in an accelerating way, and the turntable rotates to the original point quickly and then becomes the initial speed to push the door next time;
and S6, outputting the last counting result and controlling the motor to stop working after the test is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810064561.6A CN108225758B (en) | 2018-01-23 | 2018-01-23 | Testing method and control system of refrigerator door opening and closing fatigue testing machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810064561.6A CN108225758B (en) | 2018-01-23 | 2018-01-23 | Testing method and control system of refrigerator door opening and closing fatigue testing machine |
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| Publication Number | Publication Date |
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| CN108225758A CN108225758A (en) | 2018-06-29 |
| CN108225758B true CN108225758B (en) | 2020-10-09 |
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| CN201810064561.6A Active CN108225758B (en) | 2018-01-23 | 2018-01-23 | Testing method and control system of refrigerator door opening and closing fatigue testing machine |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109141848B (en) * | 2018-07-27 | 2020-03-13 | 宁波市产品质量监督检验研究院 | Tester for pedal cover-turning mechanism of garbage can |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100204759B1 (en) * | 1996-05-09 | 1999-06-15 | 박문규 | Endurance tester of a car staydamper |
| CN2695946Y (en) * | 2003-03-19 | 2005-04-27 | 上海出入境检验检疫局机电产品检测技术中心 | Device for investigating service life of door and door-trip of electrical equipment |
| CN101750207A (en) * | 2008-12-05 | 2010-06-23 | 上海轩源金属建材有限公司 | Automatic door part service life testing machine |
| CN202153186U (en) * | 2011-06-30 | 2012-02-29 | 东莞市海达仪器有限公司 | Vertical-type refrigerator door life tester |
| CN102410924B (en) * | 2011-08-08 | 2013-08-14 | 山东省科学院海洋仪器仪表研究所 | Door body hinge durability detection method and apparatus thereof |
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Effective date of registration: 20200903 Address after: 266700, Shandong Province, Qingdao Pingdu street and the north side of Fu Fu Road Office Applicant after: QINGDAO HAIBAILI MACHINERY Co.,Ltd. Address before: 266500 Haier new industrial park, Huangdao District, Qingdao, Shandong 8 Applicant before: QINGDAO FEITUO ELECTRICAL APPLIANCE Co.,Ltd. |
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