A fatigue testing device for water tank caps

Abstract

This invention provides a fatigue testing device for water tank caps, including a testing platform. The testing platform is equipped with a lifting mechanism and a quick-clamping mechanism for pressing the water tank. The lifting mechanism is driven by a cap-screwing mechanism, which moves the cap-screwing mechanism closer to or further away from the testing platform. The cap-screwing mechanism includes a cap-screwing drive motor, a torque sensing mechanism, and a cap-screwing clamping mechanism for gripping the cap. The cap-screwing drive motor has a motor shaft that is axially downward, and the drive motor is connected to the torque sensing mechanism and the clamping mechanism via a transmission connection. Both the lifting mechanism and the cap-screwing mechanism are electrically connected to a control system, and the lifting mechanism and the cap-screwing mechanism tighten or loosen the cap under the control of the control system. This invention simulates tightening and loosening the cap, monitors the torque value during the testing process, solves the problems of low efficiency and large data errors in manual testing, and improves the efficiency and accuracy of fatigue testing.

Description

Technical Field

[0001] This utility model belongs to the technical field of performance testing devices, specifically relating to a fatigue testing device for a water tank cap. Background Technology

[0002] With the continuous development of cleaning appliance technology, modern vacuum cleaners and robotic vacuum cleaners have evolved from simple dry vacuuming functions into intelligent devices capable of both wet and dry cleaning. To achieve wet mopping, these devices typically require a built-in or external water tank. During operation, this tank evenly distributes liquid onto the mop. The sealing cap is screwed onto the water tank body and a sealing ring is placed between them to achieve a liquid seal. Because users frequently need to open the sealing cap for refilling and cleaning, the sealing cap and its sealing ring are subjected to repeated mechanical twisting and wear over a long period. To ensure product quality and lifespan, simulated tests are needed to assess the durability of the water tank sealing cap and the reliability of the sealing ring. This evaluation aims to determine whether they can maintain effective sealing performance after long-term, frequent opening and closing, preventing liquid leakage and damage to internal components.

[0003] Currently, testing of this type of sealing cap is generally done manually. Testers need to manually repeat the cycle of "opening the sealing cap and tightening the sealing cap" and rely on manual counting to count the number of tests. This type of testing requires a large amount of manpower for repetitive labor, is inefficient and costly, and manual counting is prone to errors due to fatigue or negligence, resulting in inaccurate test results and affecting the objectivity and reliability of the data.

[0004] Therefore, the above problems urgently need to be solved. Utility Model Content

[0005] Purpose of the utility model: In order to overcome the above shortcomings, this utility model provides a water tank cap fatigue testing device that can automatically simulate tightening and unscrewing the sealing cap to replace manual operation, thereby improving the efficiency of fatigue testing. It can also collect torque values ​​during the testing process, solving the problems of low efficiency and large data errors in manual testing, and improving the efficiency and reliability of fatigue testing.

[0006] Technical Solution: To achieve the above objectives, this utility model provides a water tank cap fatigue testing device, including a testing platform. The testing platform is equipped with a lifting mechanism and a quick-clamping mechanism for pressing the water tank. The lifting mechanism is driven by a cap-screwing mechanism, which moves the cap-screwing mechanism closer to or further away from the testing platform. The cap-screwing mechanism includes a cap-screwing drive motor, a torque sensing mechanism, and a cap-screwing clamping mechanism for gripping the cap. The cap-screwing drive motor has its motor shaft positioned downwards. The cap-screwing drive motor is connected to the cap-screwing clamping mechanism via the torque sensing mechanism. The torque sensing mechanism is used to detect the torque value for tightening or unscrewing the cap. Both the lifting mechanism and the cap-screwing mechanism are electrically connected to a control system. Under the control of the control system, the lifting mechanism and the cap-screwing mechanism tighten or unscrew the cap to automatically execute a preset number of opening and tightening cycles.

[0007] This invention is used to test the durability of a water tank cap. The specific steps include: using a quick-clamping mechanism to press the water tank body onto the test station on the test platform, at which point the cap (i.e., the water tank sealing cap) is in a tightened state. The control system sets the number of test cycles (tightening the cap and untightening the cap constitutes one cycle), and sets the tightening and untightening torque values ​​and the rotation angle of the cap clamping mechanism. Next, the control system activates the lifting mechanism to drive the cap clamping mechanism down to the working position, i.e., the clamping arm of the cap clamping mechanism is aligned with the water tank opening. The cap drive motor drives the cap clamping mechanism to rotate a certain angle according to the set value through a torque sensing mechanism to untighten the cap. Then, it rotates in the opposite direction to tighten the cap. The above steps are repeated until the set number of cycles is reached. During the tightening and untightening of the cap, the torque sensing mechanism detects the torque value in real time. If the torque exceeds the threshold, the control system triggers an alarm and pauses the test. During the test, the control system automatically counts and records the torque value and rotation time during the test. This invention improves fatigue testing efficiency by controlling the lifting and capping mechanisms to work together through a control system, replacing manual operation. It also improves efficiency by accurately collecting torque values ​​during the test through a torque sensing mechanism to determine the wear of the cap threads and the elastic decay of the sealing ring. This solves the problems of low efficiency and large data errors in manual testing, providing reliable data support for the durability design of water tank caps and sealing rings, and improving the efficiency and accuracy of fatigue testing.

[0008] Furthermore, in the aforementioned water tank cap fatigue testing device, the cap clamping mechanism includes a gripper cylinder and grippers. The gripper cylinder has a cylinder shaft that extends and retracts to both sides. The gripper cylinder is driven by the cylinder shaft and the grippers, and the gripper cylinder drives the grippers to clamp or release the cap. By setting the gripper cylinder to drive the cylinder shaft to extend and retract, thereby driving the grippers to clamp or release the cap, the device ensures that the cap remains stably clamped during tightening or loosening, avoiding testing errors caused by loose clamping. Simultaneously, the cylinder structure is simple and responds quickly, improving the reliability and testing efficiency of the testing device.

[0009] Furthermore, in the aforementioned water tank cap fatigue testing device, the gripper includes a mounting plate and gripping arms. The mounting plate is connected to the cylinder shaft of the gripper cylinder, and the gripping arms are connected to the inner side of the mounting plate. The cross-section of the gripping arms is C-shaped, with the openings of the gripping arms facing each other. The C-shaped gripping arms form a wrapping clamp on the cap, ensuring clamping stability and improving testing accuracy.

[0010] Furthermore, in the aforementioned water tank cap fatigue testing device, the lifting mechanism includes two or more lifting guide columns vertically connected to the top surface of the testing platform. A lifting drive cylinder with a downward-pointing cylinder rod is connected to the top of each lifting guide column. A lifting plate is slidably connected to the lifting guide column. The cylinder rod of the lifting drive cylinder is driven to connect with the lifting plate, and the lifting drive cylinder drives the lifting plate to rise or fall along the lifting guide columns. To reduce swaying, the lifting plate and lifting guide columns are connected by a guide sleeve. The lifting guide columns serve as both the support frame for the lifting mechanism and the guiding reference during the lifting process of the lifting plate. This simplifies the structure while ensuring equipment stability, reducing swaying of the lifting mechanism, ensuring the positional accuracy of the cap clamping mechanism during lifting, and improving test stability.

[0011] Furthermore, in the aforementioned water tank cap fatigue testing device, a motor mounting base and a bearing housing are installed on the top surface of the lifting plate, and the motor mounting base and bearing housing are arranged in a straight line. The cap-screwing drive motor is connected to the top surface of the motor mounting base. A coupling is connected to the lower end of the motor shaft of the cap-screwing drive motor, and a drive shaft is connected to the lower end of the coupling. The drive shaft passes through the bearing housing and is driven by the torque sensing mechanism. The motor mounting base includes a square plate and round steel bars. The square plate is installed on the top surface of the lifting plate by the round steel bars at its four corners, and the bearing housing is connected to the lower center of the square plate. The bearing housing provides support for the drive shaft, reduces radial runout during the rotation of the drive shaft, and ensures the stability of the transmission.

[0012] Furthermore, in the aforementioned water tank cap fatigue testing device, a load-bearing ring is connected to the outer periphery of the drive shaft, and the bottom surface of the load-bearing ring abuts against the inner ring of the bearing in the bearing housing. The load-bearing ring reduces the load on the cap-driving motor shaft, decreases wear, and increases service life.

[0013] Furthermore, in the aforementioned water tank cap fatigue testing device, a rotating indicating mechanism is fixedly connected to the drive shaft. The rotating indicating mechanism rotates with the drive shaft to indicate the cap's rotation angle. The rotating indicating mechanism includes a follower disk connected to the drive shaft and an indicating part connected to the follower disk, the indicating part being cylindrical. The rotating indicating mechanism provides visual feedback during the testing process, facilitating monitoring of the testing process.

[0014] Furthermore, in the aforementioned water tank cap fatigue testing device, a pad is connected to the testing station on the top surface of the testing platform. The top surface of the pad has an clearance groove, and a limiting block is connected to the top surface of the testing platform, with the limiting block surrounding the outer periphery of the pad. During the test, the water tank body is placed on the top surface of the pad with the water inlet facing upwards, and the outer side of the water tank body abuts against the limiting block. Then, a quick-clamping mechanism is used to press the water tank body tightly. Installation and clamping are convenient, ensuring the positioning accuracy of the water tank body during the testing process.

[0015] Furthermore, in the aforementioned water tank cap fatigue testing device, the rapid clamping mechanism is a vertical quick clamp. By quickly moving the handle of the vertical quick clamp, the water tank can be quickly clamped or released, improving testing efficiency. Moreover, the clamping force of the vertical quick clamp is stable and reliable, ensuring the accuracy and repeatability of the test.

[0016] Furthermore, in the aforementioned water tank cap fatigue testing device, the torque sensing mechanism is a flange-type torque sensor. The flange-type torque sensor integrates input and output flanges, and can be directly connected in series between the cap drive motor and the cap clamping mechanism via bolts. It is easy to install, has good centering, sensitive response, and high measurement accuracy.

[0017] As can be seen from the above technical solution, this utility model has the following beneficial effects: The water tank cap fatigue testing device of this utility model controls the lifting mechanism and the capping mechanism to work together through the control system, replacing manual operation and improving the efficiency of fatigue testing. It also accurately collects the torque value during the test through the torque sensing mechanism to judge the wear of the cap thread and the elastic decay of the sealing ring, which solves the problems of low efficiency and large data error of manual testing, and provides reliable data support for the durability design of water tank caps and sealing rings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the water tank cap fatigue testing device of this utility model;

[0019] Figure 2 This is an internal schematic diagram of the fatigue testing device for the water tank cap of this utility model;

[0020] Figure 3 This is a schematic diagram of the screw cap clamping mechanism;

[0021] Figure 4 As shown Figure 2 Left side view;

[0022] Figure 5 As shown Figure 4 A magnified view of a portion of the image;

[0023] Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0024] Figure 7 This is a schematic diagram of the structure of the water tank and the screw cap.

[0025] In the diagram: 1. Test platform, 11. Pad, 12. Limit block, 2. Lifting mechanism, 21. Lifting guide column, 22. Lifting drive cylinder, 23. Lifting plate, 231. Motor mounting base, 232. Bearing seat, 3. Quick clamping mechanism, 4. Capping mechanism, 41. Capping drive motor, 411. Coupling, 412. Drive shaft, 413. Load-bearing ring, 414. Rotation indicator mechanism, 4141. Indicator, 42. Torque sensing mechanism, 43. Capping clamping mechanism, 431. Claw cylinder, 4311. Cylinder shaft, 432. Claw, 4321. Mounting plate, 4322. Clamping arm. Detailed Implementation

[0026] Example 1

[0027] like Figure 1-2 The illustrated water tank cap fatigue testing device includes a testing platform 1. The testing platform 1 is equipped with a lifting mechanism 2 and a quick-clamping mechanism 3 for pressing the water tank. The lifting mechanism 2 is driven by a capping mechanism 4, which moves closer to or away from the testing platform 1. The capping mechanism 4 includes a capping drive motor 41, a torque sensing mechanism 42, and a capping clamping mechanism 43 for gripping the cap. The capping drive motor 41 has its motor shaft positioned downwards. The capping drive motor 41 is connected to the capping clamping mechanism 43 via the torque sensing mechanism 42. The torque sensing mechanism 42 detects the torque value for tightening or unscrewing the cap. Both the lifting mechanism 2 and the capping mechanism 4 are electrically connected to a control system. Under the control of the control system, the lifting mechanism 2 and the capping mechanism 4 tighten or unscrew the cap to automatically execute a preset number of opening and tightening cycles.

[0028] In this embodiment, a pad 11 is connected to the test station on the top surface of the test platform 1. The top surface of the pad 11 is provided with an avoidance groove. A limit block 12 is connected to the top surface of the test platform 1. The limit block 12 is arranged around the outer periphery of the pad 11.

[0029] In this embodiment, the rapid clamping mechanism 3 is configured as a vertical rapid clamp. The vertical rapid clamp is preferably the one described in patent number CN110052986A.

[0030] In this embodiment, the torque sensing mechanism 42 is a flange-type torque sensor. The preferred flange-type torque sensor is a small-range flange-type torque sensor manufactured by Shanghai Jiuzhi Sensor Co., Ltd., model: MC10E.

[0031] like Figure 3The water tank cap fatigue testing device shown includes a cap clamping mechanism 43 comprising a gripper cylinder 431 and a gripper 432. The gripper cylinder 431 is provided with a cylinder shaft 4311 that extends and retracts to both sides. The gripper cylinder 431 is driven to connect the gripper 432 via the cylinder shaft 4311. The gripper cylinder 431 drives the gripper 432 to clamp or release the cap.

[0032] In this embodiment, the gripper 432 includes a mounting plate 4321 and gripping arms 4322. The mounting plate 4321 is connected to the cylinder shaft 4311 of the gripper cylinder 431. The gripping arms 4322 are connected to the inner side of the mounting plate 4321. The cross-section of the gripping arms 4322 is C-shaped, and the openings of the gripping arms 4322 are arranged opposite each other. An elastic pad is provided on the inner sidewall of the gripping arms 4322. The gripping arms 4322 and the mounting plate 4321 are connected in a detachable manner (such as by bolts). When different types of caps need to be tested, the gripping arms 4322 can be replaced individually to improve the adaptability of the testing device.

[0033] like Figure 4 The water tank cap fatigue testing device shown includes a lifting mechanism 2 comprising lifting guide columns 21 vertically connected to the top surface of the testing platform 1. Two or more, preferably three, lifting guide columns 21 are arranged in a triangular configuration. A lifting drive cylinder 22 with a downwardly oriented cylinder rod is connected to the top of each lifting guide column 21. A lifting plate 23 is slidably connected to the lifting guide column 21. The cylinder rod of the lifting drive cylinder 22 is drively connected to the lifting plate 23, causing the lifting drive cylinder 22 to drive the lifting plate 23 to rise or fall along the lifting guide column 21. To reduce swaying, the lifting plate 23 and the lifting guide column 21 are connected by a guide sleeve.

[0034] In this embodiment, a motor mounting base 231 and a bearing seat 232 are mounted on the top surface of the lifting plate 23, and the motor mounting base 231 and the bearing seat 232 are arranged in a straight line. A cap-screwing drive motor 41 is connected to the top surface of the motor mounting base 231. A coupling 411 is connected to the lower end of the motor shaft of the cap-screwing drive motor 41, and a drive shaft 412 is connected to the lower end of the coupling 411. The drive shaft 412 passes through the bearing seat 232 and is driven by a torque sensing mechanism 42. The motor mounting base 231 includes a square plate and round steel bars. The square plate is mounted on the top surface of the lifting plate 23 by the round steel bars at its four corners, and the bearing seat 232 is connected to the lower center of the square plate. The bearing seat 232 provides support for the drive shaft 412, reducing radial runout during rotation and ensuring transmission stability.

[0035] like Figure 5 The water tank cap fatigue testing device shown has a load-bearing ring 413 connected to the outer periphery of the drive shaft 412, and the bottom surface of the load-bearing ring 413 abuts against the inner ring of the bearing provided in the bearing seat 232.

[0036] In this embodiment, a rotation indicator mechanism 414 is fixedly connected to the drive shaft 412. The rotation indicator mechanism 414 rotates with the drive shaft 412 to indicate the rotation angle of the cap. The rotation indicator mechanism 414 includes a follower disk connected to the drive shaft 412 and an indicator part 4141 connected to the follower disk. The indicator part 4141 is cylindrical.

[0037] The specific steps for testing the durability of the water tank cap according to this utility model include:

[0038] Place the water tank body with the water inlet facing upwards on the top surface of the pad 11, with the outer side of the water tank body abutting against the limiting block 12. Move the handle of the quick-clamping mechanism 3 to press the water tank body tightly. At this time, the cap is tightened onto the water inlet of the water tank body.

[0039] The test begins by setting the number of test cycles (tightening the cap and untightening the cap constitutes one cycle), tightening and untightening torque thresholds (e.g., untightening torque ≤ 1.5 N·m, tightening torque ≥ 2 N·m), and the rotation angle of the cap clamping mechanism 43 (e.g., 45 degrees) via the control system. The control system controls the lifting drive cylinder 22 to drive the lifting plate 23 to descend along the lifting guide column 21, causing the cap clamping mechanism 4 to move down to the working position. The gripper cylinder 431 drives the cylinder shaft 4311 to extend and retract to both sides, causing the C-shaped gripper arm 4322 to clamp the cap. The drive motor 41 drives the cap clamping mechanism 43 to rotate at the set angle to fully untighten the cap. The rotation indicator mechanism 414 rotates accordingly. The torque sensing mechanism 42 detects the torque value during the untightening process in real time. If the torque exceeds the threshold, the control system immediately triggers an alarm and pauses the test.

[0040] Subsequently, the cap-screwing drive motor 41 reverses to drive the cap-screwing clamping mechanism 43 to tighten the cap. The cap-screwing clamping mechanism 43 rotates at a set angle, tightening the cap and completing one cycle. The control system automatically counts and records the peak torque and rotation time of that cycle. The torque sensing mechanism 42 detects the tightening torque in real time. When it reaches or exceeds a preset threshold, the motor stops rotating, the control system immediately triggers an alarm, and the test is paused. Finally, the cap-screwing clamping mechanism 43 releases the cap, and the lifting drive cylinder 22 drives the lifting plate 23 to rise, moving the cap-screwing clamping mechanism 43 away from the water tank. The above cycle is repeated until the preset number of cycles is reached. The test ends. The control system can output the tightening and loosening torque curve for reference.

[0041] Example 2

[0042] The difference between this embodiment and Embodiment 1 is that, as Figure 7The water tank cap fatigue testing device shown has a transparent enclosure with a lockable door. The side walls of the enclosure are made of transparent PC material to prevent dust contamination from affecting the testing process, ensuring the stability of the testing environment. The transparent enclosure allows for real-time monitoring of the testing process, facilitating problem tracing. The control system is located on the top of the transparent enclosure and includes an LCD display panel, operation buttons, and warning lights.

[0043] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A water tank cap fatigue testing device, characterized by: The test platform (1) is provided with a lifting mechanism (2) and a quick-pressing mechanism (3) for pressing the water tank. The lifting mechanism (2) is driven to connect to a capping mechanism (4). The lifting mechanism (2) drives the capping mechanism (4) to move closer to or away from the test platform (1). The capping mechanism (4) includes a capping drive motor (41), a torque sensing mechanism (42), and a capping clamping mechanism (43) for clamping the cap. The capping drive motor (41) is provided with a motor shaft that is set downward. The capping drive motor (41) is connected to the capping clamping mechanism (43) through the torque sensing mechanism (42). The torque sensing mechanism (42) is used to detect the torque value of tightening or unscrewing the cap. The lifting mechanism (2) and the capping mechanism (4) are both electrically connected to the control system. The lifting mechanism (2) and the capping mechanism (4) tighten or unscrew the cap under the control of the control system.

2. The water tank cap fatigue testing device of claim 1, wherein: The cap clamping mechanism (43) includes a gripper cylinder (431) and a gripper (432). The gripper cylinder (431) is provided with a cylinder shaft (4311) that extends and retracts to both sides. The gripper cylinder (431) is driven to connect the gripper (432) through the cylinder shaft (4311). The gripper cylinder (431) drives the gripper (432) to clamp or release the cap.

3. The water tank cap fatigue testing device of claim 2, wherein: The gripper (432) includes a mounting plate (4321) and a gripper arm (4322). The mounting plate (4321) is connected to the cylinder shaft (4311) of the gripper cylinder (431). The gripper arm (4322) is connected to the inner side of the mounting plate (4321). The cross-section of the gripper arm (4322) is C-shaped, and the openings of the gripper arm (4322) are arranged opposite to each other.

4. The water tank cap fatigue testing device of claim 1, wherein: The lifting mechanism (2) includes a lifting guide column (21) vertically connected to the top surface of the test platform (1). There are two or more lifting guide columns (21). The top of the lifting guide column (21) is connected to a lifting drive cylinder (22) with a cylinder rod set downward. The lifting guide column (21) is slidably connected to a lifting plate (23). The cylinder rod of the lifting drive cylinder (22) is driven to connect with the lifting plate (23). The lifting drive cylinder (22) drives the lifting plate (23) to rise or fall along the lifting guide column (21).

5. The water tank cap fatigue testing device according to claim 4, characterized in that: The top surface of the lifting plate (23) is equipped with a motor mounting base (231) and a bearing seat (232), which are arranged in a straight line. The cap-screwing drive motor (41) is connected to the top surface of the motor mounting base (231). The lower end of the motor shaft of the cap-screwing drive motor (41) is connected to a coupling (411), and the lower end of the coupling (411) is connected to a drive shaft (412). The drive shaft (412) passes through the bearing seat (232), and the drive shaft (412) is driven and connected to the torque sensing mechanism (42).

6. The water tank cap fatigue testing device of claim 5, wherein: The drive shaft (412) is connected to a load-bearing ring (413) on its outer periphery, and the bottom surface of the load-bearing ring (413) abuts against a bearing provided in the bearing seat (232).

7. The water tank cap fatigue testing device of claim 6, wherein: The drive shaft (412) is fixedly connected to a rotation indicator mechanism (414), which rotates with the drive shaft (412) to indicate the rotation angle of the cap; the rotation indicator mechanism (414) includes a follower disk connected to the drive shaft (412) and an indicator part (4141) connected to the follower disk, the indicator part (4141) being a cylinder.

8. The water tank cap fatigue testing device of claim 1, wherein: The test platform (1) has a test station on its top surface connected to a pad (11). The top surface of the pad (11) is provided with an avoidance groove. The top surface of the test platform (1) is connected to a limit block (12). The limit block (12) is arranged around the outer periphery of the pad (11).

9. The water tank cap fatigue testing device of claim 8, wherein: The rapid clamping mechanism (3) is configured as a vertical rapid clamp.

10. The water tank cap fatigue testing device of claim 8, wherein: The torque sensing mechanism (42) is configured as a flange-type torque sensor.

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