Opening and closing life testing machine and testing method for horizontal display refrigerator door body

Abstract

The invention discloses an opening and closing life testing machine and a testing method for a horizontal display refrigerator door body, the opening and closing life testing machine comprises a support frame, a first box body and a second box body, the first box body slides directionally relative to the support frame, the second box body is fixedly connected with the support frame, and a clamp is arranged on the corresponding support frame between the first box body and the second box body. Height-adjustable mechanical driving mechanisms are arranged on the opposite side surfaces of the first box body and the second box body, and are controlled by a control system; the mechanical driving mechanism comprises a vacuum adsorption unit, a connecting rod unit, an angle adjusting unit and a driving unit, the connecting rod unit is driven by the driving unit to achieve reciprocating motion, the connecting rod unit is connected with the vacuum adsorption unit through the angle adjusting unit, and the angle adjusting unit achieves angle adjustment of 0-90 degrees. The rapid quality detection requirement in large-scale production can be met, the testing process is safe and reliable, the universality of the equipment is improved, the manufacturing cost is reduced, and remarkable technical progress and practical application value are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment testing, in particular to a switch life testing machine and a testing method for a horizontal display refrigerator door. Background Art

[0002] Sliding doors, as a crucial component of refrigerators, not only facilitate user access and placement of items but also effectively isolate cold air and maintain a stable temperature inside the refrigerator. Sliding glass doors frequently open and close during use, and their lifespan directly impacts the overall performance and cost of use. Issues such as aging door structure, worn sealing strips, and damaged pulleys can lead to decreased refrigeration efficiency, increased energy consumption, and even compromise food safety.

[0003] Currently, the lifespan testing of refrigerator sliding glass doors primarily relies on manual door opening and closing to count the number of times the doors are opened and closed. Manual testing is slow, making it difficult to complete a large number of door opening and closing tests in a short period of time, and thus unable to meet the quality testing requirements of large-scale production. Furthermore, it is difficult to maintain consistent force, speed, and frequency of manual operation, resulting in poor repeatability and accuracy in test results, making it impossible to accurately assess the actual service life of sliding glass doors. Furthermore, prolonged manual operation can easily lead to fatigue, increase the risk of operational errors, and even cause harm to operators. Although some companies have adopted simple mechanical devices for testing, these devices are typically complex in structure, have a single function, and are often driven by motors. Frequent starting and stopping can easily lead to motor overheating, making them unable to meet the various requirements for refrigerator door lifespan testing and unable to obtain comprehensive test results on multiple performance aspects. Summary of the Invention

[0004] In order to overcome the above problems existing in the prior art, the present invention provides a switch life testing machine and a testing method for a horizontal display refrigerator door.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a switch life testing machine for a horizontal display refrigerator door body, comprising a support frame, a first box, and a second box, wherein the first box slides directionally relative to the support frame, the second box is fixedly connected to the support frame, a clamp is provided on the corresponding support frame between the first box and the second box, and a height-adjustable mechanical drive mechanism is provided on the opposite sides of the first box and the second box, and the mechanical drive mechanism is controlled by a control system; The mechanical driving mechanism includes a vacuum adsorption unit, a connecting rod unit, an angle adjustment unit, and a driving unit. The connecting rod unit is driven by the driving unit to achieve reciprocating motion. The connecting rod unit is connected to the vacuum adsorption unit through the angle adjustment unit. The angle adjustment unit achieves angle adjustment of 0°-90°.

[0006] In the above-mentioned switch life tester for a horizontal display refrigerator door, the opposite sides of the first box body and the second box body are both provided with strip-shaped fixing grooves, and the mechanical drive mechanism is detachably mounted on the strip-shaped fixing grooves.

[0007] The above-mentioned switch life testing machine for horizontal display refrigerator doors, the vacuum adsorption unit includes a silicone suction cup and a vacuum tube. Through the continuous action of the vacuum tube, the silicone suction cup maintains a negative pressure state of -60kPa to -80kPa.

[0008] The above-mentioned switch life testing machine for the horizontal display refrigerator door body is provided with a guide groove on the support frame corresponding to the first box body, the first box body is provided with a guide block matching the guide groove, the bottom of the first box body is provided with a directional wheel, and the directional wheel is provided with a brake structure.

[0009] The above-mentioned switch life testing machine for horizontal display refrigerator door body has two groups of clamps, and the opposite sides of the two groups of clamps are provided with slide grooves. One end of the clamp is fixedly connected to the support frame, and the other end is provided with a fixing clamp that can slide along the slide groove.

[0010] In the above-mentioned switch life tester for a horizontal display refrigerator door, the fixing clamp is provided with a fastening structure for fixing the position of the fixing clamp.

[0011] The above-mentioned switch life testing machine for horizontal display refrigerator doors, the control system includes a displacement sensor, a pressure sensor, a data storage unit, a fault self-diagnosis unit, and a controller. The displacement sensor is used to monitor the position data during the door opening and closing process and transmit the data to the controller; the pressure sensor is used to monitor the pressure of the vacuum adsorption unit and transmit the data to the controller; the fault self-diagnosis unit has multiple built-in fault types, and judges the fault type through the data collected by the controller, and triggers an emergency response according to the fault type; the data storage unit saves the displacement, pressure, frequency, fault event and timestamp of each test.

[0012] A test method for a switch life tester for a horizontal display refrigerator door is based on the above-mentioned switch life tester for a horizontal display refrigerator door, and includes three modes: continuous test, cycle counting test, and fault simulation test.

[0013] The beneficial effects of the present invention are: (1) the present invention adopts a modular structural design, and through the dynamic adjustment of the double box and the mechanical arm, it can adapt to the specifications of most refrigerators on the market, thereby reducing the equipment procurement cost.

[0014] The present invention is equipped with a user-friendly human-computer interaction interface. Users can easily set test parameters (such as push and pull times, push and pull frequency, stroke, etc.) through the touch screen and view the test progress and data in real time.

[0015] The present invention can realize the alternating driving of dual robotic arms, and the efficiency of a single machine is greatly improved compared with manual operation.

[0016] The present invention adopts an angle adjustment joint design between the electric push rod and the suction cup, so that the force direction of the electric push rod can be converted arbitrarily, avoiding uneven force on the sliding door during the sliding process, reducing motor overload failure and internal thread wear, significantly extending the service life of the equipment, and reducing maintenance costs.

[0017] This system is equipped with a high-precision displacement sensor that monitors the sliding door's opening and closing frequency and displacement in real time, ensuring the accuracy and reliability of test data. The data acquisition module, combined with a PLC, automatically generates detailed test reports, providing a scientific basis for sliding door lifespan assessment.

[0018] The present invention can identify a variety of abnormal codes, brake in time to avoid damage to the equipment or the tested component, and ensure unattended safety.

[0019] The drive of the present invention adopts an adjustable pressure system, which saves 30% energy compared with traditional motor drive and reduces noise to below 65dB.

[0020] (8) The equipment of the present invention adopts a modular design, and the silicone suction cup, sensor and other wearing parts adopt a quick-disassembly structure, which is convenient for maintenance and upgrading and reduces resource waste.

[0021] (9) The present invention significantly reduces the manufacturing and maintenance costs of the equipment by optimizing the structural design and using highly durable materials. Furthermore, the efficiency and versatility of the equipment reduce the need for customers to purchase multiple units, further reducing customer costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a stereogram of the present invention; Figure 2 This invention Figure 1 Enlarged view of part A; Figure 3 It is a top view of the present invention.

[0023] Among them, 1. support frame, 2. first box body, 3. strip fixing groove, 4. fixing clamp, 5. clamp, 6. second box body, 7. vacuum tube, 8. connecting rod unit, 9. angle adjustment unit, 10. silicone suction cup, 11. driving unit. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1-3 As shown, this embodiment discloses a horizontal display refrigerator door opening and closing life testing machine. Through the innovative integration of a modular mechanical structure and an intelligent control system, the device enables automated life testing for refrigerators of various specifications, effectively addressing key technical challenges associated with traditional manual testing, such as low efficiency, inaccurate data, and poor equipment versatility. Its core design utilizes a dual-chamber frame system constructed from high-load-bearing industrial aluminum profiles. A directional pulley mechanism is located on the left side (i.e., the first chamber 2), while a fixed chamber (i.e., the second chamber 6) is located on the right. Pulleys allow the distance between the two chambers to be adjusted within a 1900mm range.

[0026] It includes a support frame 1, a first box body 2, and a second box body 6. The first box body 2 slides directionally relative to the support frame 1, and the second box body 6 is fixedly connected to the support frame 1. A clamp is provided on the support frame 1 corresponding to the first box body 2 and the second box body 6. The opposite sides of the first box body 2 and the second box body 6 are provided with a height-adjustable mechanical drive mechanism, and the mechanical drive mechanism is controlled by a control system.

[0027] The support frame corresponding to the first housing is provided with a guide groove, and the first housing is provided with a guide block that cooperates with the guide groove. The bottom of the first housing is provided with a fixed wheel, and the fixed wheel is provided with a brake structure. The cooperation between the guide groove and the guide block allows the first housing to be translated left and right. By changing the position of the first housing, the distance between the first housing and the second housing can be changed, making the test machine disclosed in this embodiment applicable to a variety of horizontal refrigerators of different specifications.

[0028] like Figure 1 As shown, in this embodiment, the opposite sides of the first box body and the second box body are provided with a strip fixing groove 3, and the mechanical drive mechanism is detachably mounted on the strip fixing groove through a mounting bracket. In this embodiment, the mounting bracket is fixed by bolts.

[0029] The mechanical drive mechanism includes a vacuum adsorption unit, a connecting rod unit 8, an angle adjustment unit 9, and a drive unit 11. The connecting rod unit is driven by the drive unit to achieve reciprocating motion. The connecting rod unit 8 is connected to the vacuum adsorption unit through the angle adjustment unit, and the angle adjustment unit 9 achieves angle adjustment of 0°-90°. The drive unit can be a drive device that can achieve reciprocating motion, such as a cylinder or an oil cylinder. In this embodiment, the drive unit is a pneumatic drive cavity connected to an external air source. The connecting rod unit 8 generates differential pressure power through the pneumatic drive cavity with an adjustable working pressure of 0.5-0.8MPa. In conjunction with the strip fixing groove and mounting bracket with a vertical adjustment stroke of ±150mm, precise control of door bodies of different specifications is ensured.

[0030] The mechanical drive mechanism is connected to an external air source and pneumatically drives two independent connecting rod units, allowing the left and right mechanical drive mechanisms to operate independently. By flexibly adjusting the width between the boxes and the height of the mechanical arms, this embodiment can fully meet the various requirements of refrigerator testing.

[0031] The vacuum adsorption unit includes a silicone suction cup 10 and a vacuum conduit 7. Through the continuous action of the vacuum conduit 7, the silicone suction cup maintains a negative pressure state of -60kPa to -80kPa.

[0032] There are two groups of clamps, and the opposite sides of the two groups of clamps 5 are provided with slide grooves. One end of the clamp is fixedly connected to the support frame, and the other end is provided with a fixing clamp that can slide along the slide groove. The fixing clamp is provided with a fastening structure for fixing the position of the fixing clamp 4.

[0033] The control system includes a displacement sensor, pressure sensor, data storage unit, fault self-diagnosis unit, and controller. With a PLC as its core, it integrates a touchscreen human-machine interface, displacement sensor, pressure feedback module, fault self-diagnosis system, and data storage unit. As the control center, the PLC is responsible for receiving sensor signals, executing logical operations, outputting control commands, and coordinating the operation of various modules. The system supports 16 digital inputs / outputs, 4 analog inputs, and 2 high-speed counters, and can simultaneously run door opening and closing tests, data acquisition, and fault diagnosis programs.

[0034] The touch human-machine interface supports a dynamic graphical operation interface, which can set the test mode, push and pull times, frequency and suction cup start and stop timing, and supports real-time adjustment of pressure threshold and movement stroke.

[0035] A displacement sensor is installed at the end of the connecting rod, capturing the position data y(t) during the freezer door opening and closing process and transmitting it synchronously to the PLC. The PLC reads the sensor data, compares it with the target position r(t), and calculates the instantaneous error e(t) = r(t) - y(t). The PLC then executes the digital PID algorithm. Among them, T s : The sampling time (synchronized with the sensor sampling frequency) converts the PID output u(k) into a control signal to adjust the air pressure to drive the robotic arm, correct the position of the refrigerator door, and form a closed-loop feedback.

[0036] A pressure sensor integrated into the vacuum tube monitors the air pump pressure in real time. If pressure fluctuations exceed ±5 kPa, the PLC automatically adjusts the air pump power or triggers the pressure relief valve. If pressure abnormalities persist, the system releases suction force and shuts down.

[0037] The fault self-diagnosis unit has 12 preset fault types, including mechanical jam (E002), sensor failure (E003), and communication interruption (E004). The PLC periodically verifies sensor data against preset thresholds and triggers three levels of emergency response when an anomaly occurs: Level 1: an early warning with a flashing yellow screen; Level 2: a buzzer alarm and test pause; Level 3: emergency braking of the circuit, power supply cutoff, and pneumatic pressure relief to prevent equipment damage.

[0038] The data storage unit stores displacement, pressure, frequency, fault events, and timestamps for each test, supporting data for 100,000 test cycles. The system automatically summarizes test results and outputs a PDF report.

[0039] Based on the above-mentioned horizontal display refrigerator door switch life tester, this embodiment also discloses three test modes: continuous test, cycle count test and fault simulation test. It fully covers the quality inspection requirements of refrigerator products. The continuous test mode is suitable for long-term and continuous durability testing of products to evaluate the stability and life of refrigerator doors under long-term use. First, the test parameters must be set, including the total number of tests N. max , switching frequency f, opening stroke S, then the robot arm performs the switching action according to a fixed cycle and stops when the number of detection cycles N(t) meets any of the conditions: in, i =1 indicates the i-th complete switching action.

[0040] The cycle mode supports multi-stage parameter combination testing. Users can set the stage switching frequency f according to actual needs. j , each stage can set different opening and closing times N j 、Itinerary S j , inter-stage retention time t hold,j This mode is suitable for simulating various working conditions that a refrigerator may encounter during actual use, in order to comprehensively evaluate its performance and lifespan. The equipment performs each stage of the test in sequence according to the set order and parameters until all stages of the cycle test are completed. The state transition equation is: CurrentStage= Total number of tests N total = .

[0041] The fault simulation mode is in the time window [t k , t k +ΔF], such as mechanical failure (additional resistance F is applied). fault =F normal+ΔF), control failure (modify the vacuum setting value P vacuum =P0±ΔP), etc. The equipment will simulate these abnormal conditions during the test and observe the response and performance of the product: This mode is designed to verify the reliability and safety of the product when encountering failures or abnormal situations, and provide data support for product optimization and improvement.

[0042] This invention provides a horizontal display refrigerator door switch life tester. It addresses the problems of low test accuracy and poor repeatability in existing refrigerator testing processes, meeting the rapid quality inspection requirements of large-scale production. It also avoids operator errors and safety hazards caused by fatigue, ensuring a safe and reliable testing process. While meeting these requirements, the device's structural design is optimized, improving its universality and reducing manufacturing costs. This represents a significant technological advancement and has practical application value.

[0043] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the spirit and scope of protection of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present invention.

Claims

1. A switch life tester for horizontal display refrigerator door, characterized in that: The invention comprises a support frame, a first box body, and a second box body, wherein the first box body slides directionally relative to the support frame, the second box body is fixedly connected to the support frame, a clamp is provided on the support frame corresponding to the first box body and the second box body, and a height-adjustable mechanical drive mechanism is provided on the opposite sides of the first box body and the second box body, and the mechanical drive mechanism is controlled by a control system; The mechanical driving mechanism includes a vacuum adsorption unit, a connecting rod unit, an angle adjustment unit, and a driving unit. The connecting rod unit is driven by the driving unit to achieve reciprocating motion. The connecting rod unit is connected to the vacuum adsorption unit through the angle adjustment unit. The angle adjustment unit achieves angle adjustment of 0°-90°.

2. The switch life testing machine for a horizontal display refrigerator door according to claim 1, characterized in that: The opposite sides of the first box body and the second box body are both provided with strip-shaped fixing grooves, and the mechanical driving mechanism is detachably mounted on the strip-shaped fixing grooves.

3. The switch life testing machine for a horizontal display freezer door according to claim 1, characterized in that: The vacuum adsorption unit includes a silicone suction cup and a vacuum tube. Through the continuous action of the vacuum tube, the silicone suction cup maintains a negative pressure state of -60kPa to -80kPa.

4. The switch life testing machine for a horizontal display refrigerator door according to claim 1, characterized in that: A guide groove is provided on the support frame corresponding to the first box body, a guide block matched with the guide groove is provided on the first box body, a directional wheel is provided at the bottom of the first box body, and a brake structure is provided on the directional wheel.

5. The switch life testing machine for a horizontal display refrigerator door according to claim 1, characterized in that: The clamps are provided in two groups, and slide grooves are provided on opposite sides of the two groups of clamps. One end of the clamp is fixedly connected to the support frame, and the other end is provided with a fixing clamp that can slide along the slide groove.

6. The switch life testing machine for a horizontal display freezer door according to claim 5, characterized in that: The fixing clip is provided with a fastening structure for fixing the position of the fixing clip.

7. The switch life testing machine for a horizontal display refrigerator door according to claim 1, characterized in that: The control system includes a displacement sensor, a pressure sensor, a data storage unit, a fault self-diagnosis unit, and a controller. The displacement sensor is used to monitor position data during the door opening and closing process and transmit the data to the controller; the pressure sensor is used to monitor the pressure of the vacuum adsorption unit and transmit the data to the controller; the fault self-diagnosis unit has multiple built-in fault types, and determines the fault type through data collected by the controller, and triggers an emergency response based on the fault type; the data storage unit saves the displacement, pressure, frequency, fault event and timestamp of each test.

8. A test method for a switch life tester for a horizontal display refrigerator door, characterized in that: A switch life testing machine for a horizontal display freezer door according to any one of claims 1 to 7 includes three modes: continuous testing, cycle counting testing, and fault simulation testing.

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