A pressure test device and test method for a folding stroller

Abstract

The application provides a pressure test device and test method for a folding baby carriage, and belongs to the technical field of baby carriage pressure test. The device comprises a workbench and a test mechanism. The test mechanism comprises a cylinder one fixed on the top of the workbench through a support. The application sets an arc-shaped part, a V-shaped part and a ball head. After the wheel is sleeved on the wheel shaft and positioned by a positioning assembly, the cylinder continuously presses the wheel surface of the wheel by the arc-shaped part to simulate the working condition of the wheel rolling on the hard protrusions on the road surface. Then, the ball head is downward by rotating the pressure head, and the wheel is rotated by 120 degrees. The ball head continuously presses the wheel to simulate the working condition of the wheel rolling on the stones. Then, the V-shaped part is downward, and the wheel is rotated by 120 degrees again. The V-shaped part continuously presses the wheel and temporarily stops to simulate the working condition of the wheel passing through the steps. Through the above design, the test of the wheel is more in line with the actual use environment, and the accuracy and reliability of the subsequent test results are ensured.

Description

Technical Field

[0001] This invention relates to the field of pressure testing technology for strollers, and particularly to a pressure testing device and method for folding strollers. Background Technology

[0002] Folding strollers are baby carriages that can be folded down to reduce their size, making them easy to store and carry. The pressure test simulates various static or dynamic pressures experienced by the stroller during use, testing the structural strength, stability, and load-bearing limits of its frame, folding locking mechanism, seat, and other parts. It verifies whether the product can withstand the specified pressure without deformation, damage, or locking failure. When the folding stroller is subjected to a walking bump test under pressure, multiple raised strips of different heights are installed on the conveyor belt. The folding stroller is placed on the conveyor belt, and the rotation of the conveyor belt causes the wheels of the folding stroller to rotate. When the wheels pass over the raised strips of different heights, bumps are generated, thus simulating the road conditions encountered in actual use.

[0003] When a folding stroller undergoes a walking bump test under pressure, different height convex strips installed on the conveyor belt simulate different road conditions encountered by the stroller in actual use. However, in actual use, there are also situations where the stroller runs over stones and passes over steps. When the wheels run over stones, they will be subjected to localized hard instantaneous compression and impact from the stones. When the wheels pass over steps, they will be subjected to instantaneous impact and brief jamming. It is difficult to accurately simulate the situation of the wheels running over stones and passing over steps using only convex strips of different heights. Therefore, this application provides a pressure testing device and testing method for a folding stroller to meet the requirements. Summary of the Invention

[0004] This invention provides a pressure testing device and method for folding strollers to solve the problem that when a folding stroller is subjected to a walking bump test under pressure, it is difficult to accurately simulate the situation of the wheels running over stones and passing through steps using only raised strips of different heights.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A pressure testing device for a folding stroller includes a workbench and further includes: The testing mechanism includes a cylinder fixed to the top of the workbench by a bracket. A pressure sensor is fixed to the telescopic end of the cylinder. A connecting seat is fixed to the bottom of the pressure sensor. A pressure head is rotatably connected to the connecting seat via a rotating shaft. An arc-shaped part, a V-shaped part, and a ball head are fixed to the pressure head. The included angle between the V-shaped part, the ball head, and the arc-shaped part is 120 degrees. A locking bolt is threaded to the side of the connecting seat and abuts against the rotating shaft. A support platform is fixed to the top of the workbench. A fixing rod is fixed to the top of the support platform. An axle is rotatably connected to the side of the fixing rod. A wheel is fitted on the axle and is located above the workbench. A positioning component for positioning the wheel is provided on the axle. During testing, the wheel is fitted onto the axle and positioned using a positioning component. Then, the cylinder drives the arc-shaped part, V-shaped part, and ball head to press onto the wheel.

[0006] Preferably, the positioning component includes a circular box that is fixedly fitted onto the axle by a rotating lock. An air pipe connector is fixed on the side of the circular box away from the wheel. The air pipe connector is connected to an air pump through an air pipe. Multiple clamping components are provided on the side of the circular box near the wheel. Three pressure sensors are embedded in the inner wall of the circular box corresponding to the axle. All three pressure sensors are attached to the axle. After the wheel is fitted onto the axle, the air pump operates, and compressed air enters the clamping components from the circular box. After the clamping components are ventilated, they expand and clamp into the wheel hub.

[0007] Preferably, three positioning rings are fixed on the side of the round box away from the wheel, a support base is fixed on the top of the support platform, the outer wall of the round box is rotatably connected to the top of the support base, and a positioning bolt is threadedly connected to the side of the support base, with the end of the positioning bolt inserted into the socket located at the bottom.

[0008] Preferably, the pressure head is fixed with insert one, insert two and insert three respectively, and the included angle between insert one, insert two and insert three is 120 degrees. Three sockets are fixed on the side of the round box near the wheel. Insert one, insert two and insert three are all inclined. The inclination angle of insert two is greater than that of insert one, and the inclination angle of insert three is greater than that of insert two. The shape of the inner wall of the three sockets is adapted to the shape of insert one, insert two and insert three respectively.

[0009] Preferably, the clamping component includes a circular tube fixed to the side of the circular box near the wheel, the circular tube being connected to the circular box, a circular disc being fixed to the side of the circular tube near the wheel axle, and an air bladder being fixed to the side of the circular disc near the wheel axle. The circular disc has a large air hole, which is connected to the circular tube. After the air pump is turned on, compressed air enters the air bladder through the circular tube and the large air hole, and the air bladder expands and clamps the wheel hub.

[0010] Preferably, a sealing plate is fixed to the inner wall of the airbag. The central area of ​​the sealing plate has an integrally formed recess. Small air holes are opened on the recess. The area of ​​the small air holes is smaller than that of the large air holes. A guide rod and a tension spring are fixed to the inner wall of the recess. A guide sleeve is fixed to the side of the disc near the wheel axle. The guide rod is slidably connected in the guide sleeve. The side of the tension spring away from the wheel axle is fixedly connected to the side of the disc near the wheel axle. The tension spring is sleeved on the guide rod and the guide sleeve. A side rod is fixed to the side of the sealing plate away from the wheel axle. The end of the side rod away from the tension spring is fixedly inserted through the airbag and fixed with a pressure strip. A rubber sleeve is fixedly sleeved on the pressure strip. The rubber sleeve abuts against the wheel hub.

[0011] Preferably, an annular groove is provided on the side rod corresponding to the position of the airbag, the airbag is wrapped in the inner wall of the annular groove, and a side protrusion is integrally formed on the inner wall of the airbag corresponding to the side rod, the side protrusion is wrapped in the side rod.

[0012] Preferably, the airbag has an integrally formed extension on the side away from the wheel center, the extension is fixed to the side of the disc near the wheel axle, the side of the airbag has an integrally formed protrusion, the protrusion is located between the extension and the sealing disc, and the thickness of the middle part of the protrusion is less than the thickness of the top and bottom parts, the side of the airbag near the wheel axle has an integrally formed thickened part, the outer wall of the thickened part abuts against the wheel hub, and multiple spring pieces are fixed to the inner wall of the thickened part, the spring pieces are fixed to the side of the sealing disc near the wheel axle.

[0013] Preferably, a second cylinder is fixed to the top of the workbench, and a displacement sensor is fixed to the telescopic end of the second cylinder.

[0014] A testing method for a folding stroller, applied to the aforementioned pressure testing equipment for a folding stroller, includes the following steps: S1: Fit the wheel onto the axle and clamp the wheel by inflating the airbag; S2: The arc-shaped part is locked downwards, and the starting cylinder drives the arc-shaped part to press down on the wheel to simulate the working condition of crushing hard protrusions; S3: Lock the ball head downwards, start the cylinder to drive the ball head to press down the wheel to simulate the crushing of stones; S4: Lock the V-shaped part downwards, and start the cylinder to drive the V-shaped part to press down the wheel to simulate the working condition of passing through the step; S5: After the test is completed, turn off the air pump to release the compressed air in the airbag. The airbag will then contract and reset. Remove the wheel from the axle. The test is now complete.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: In the above scheme, by setting up an arc-shaped part, a V-shaped part, and a ball head, the wheel is fitted onto the axle and positioned by a positioning component. Then, the cylinder drives the arc-shaped part to continuously press down on the wheel surface, simulating the condition of the wheel rolling over hard protrusions on the road surface. Then, the pressure head is rotated so that the ball head faces down, and the wheel is rotated 120 degrees at the same time, so that the ball head continuously presses down on the wheel to simulate the condition of the wheel rolling over stones. Next, the V-shaped part faces down and the wheel is rotated 120 degrees again, so that the V-shaped part continuously presses down on the wheel and pauses briefly to simulate the condition of the wheel passing over a step. Through the above design, the wheel test is more in line with the actual use environment, providing a strong guarantee for the accuracy and reliability of subsequent test results.

[0016] By setting up pressure sensor one, the downward pressure of the arc-shaped part, V-shaped part and ball head can be controlled, making the test pressure more accurate and reliable.

[0017] By setting up a circular box, which is fixed to the axle by a rotating lock, the circular box can be moved on the axle by opening the rotating lock. After adjusting the position of the circular box to a suitable position, the rotating lock can be tightened. Then, the wheel is placed on the axle and the side of the wheel is aligned with the side of the circular box to achieve initial wheel positioning. By adjusting the position of the circular box, it can be adapted to the testing of wheels of different widths, ensuring that the center point of the wheel is located on the telescopic axis of cylinder one, thus laying the foundation for the accuracy of subsequent measurement results. At the same time, the positioning of the airbag can also make the clamping device adaptable to wheels of different sizes of the same type, improving the adaptability of the clamping device.

[0018] By setting up pressure sensor two, there are three pressure sensors, which correspond to the arc-shaped part, V-shaped part and ball head position respectively. When the arc-shaped part, V-shaped part or ball head presses down on the wheel, the wheel axle will also be subjected to pressure. At this time, the pressure sensor at the corresponding position can detect whether the wheel axle is bent.

[0019] By setting up an airbag, after the wheel is in contact with the round box, the air pump is started, and compressed air enters the airbag through the round pipe and the large air hole. The airbag expands and clamps the wheel in the wheel hub to achieve wheel positioning, preventing the wheel from rotating randomly on the axle. This ensures that the wheel is stably driven to rotate when the round box rotates, thereby ensuring that the distance between the three test items remains consistent and preventing two adjacent test areas from being too close to affect the test results.

[0020] By setting up three positioning rings, corresponding to the arc-shaped part, V-shaped part, and ball head respectively, the end of the positioning bolt is inserted into one of the positioning rings to prevent the wheel from rotating arbitrarily. Once the clamping device positions the wheel, the test can be started. When the positioning bolt is inserted into another positioning ring, it indicates that the wheel has rotated 120 degrees, and the next test item can be performed. The cooperation between the positioning bolt and the positioning rings ensures that the spacing between the three test areas is consistent, further preventing two adjacent test areas from being too close and affecting the test accuracy.

[0021] By setting up inserts one, two, and three, insert one is inserted into the corresponding socket when the wheel is pressed down on the curved part. When the wheel is pressed down on the ball head, the round box needs to rotate the wheel 120 degrees. At this time, the other socket is aligned with the position of insert two. When the wheel is pressed down on the V-shaped part, the round box rotates the wheel another 120 degrees, and the last socket is aligned with the position of insert three. At the same time, due to the influence that the tilt angle of insert two is greater than that of insert one, and the tilt angle of insert three is greater than that of insert two, inserts one, two, and three can only be inserted into the corresponding sockets. This design effectively avoids the problem that the pressure head rotates but the wheel does not rotate, and the three tests only act on the same area of ​​the wheel, thus greatly ensuring the accuracy and reliability of the test results.

[0022] By incorporating a sealing disc, tension spring, and pressure bar, when the airbag is inflated, the area of ​​the airbag far from the axle expands rapidly due to the obstruction of the sealing disc and the larger area of ​​the large air pore compared to the small air pore. This causes the sealing disc to move the pressure bar on the side rod closer to the axle. The tension spring is in a stretched state, and the rubber sleeve on the pressure bar presses against the wheel hub to position the wheel. Simultaneously, the area of ​​the airbag near the axle moves closer to the axle during the slow expansion process. As the airbag's inflation volume increases, the area near the axle expands and presses against the wheel hub, repositioning the wheel. This design improves the wheel positioning capability and effectively prevents the wheel from rotating arbitrarily on the axle, thus affecting the test.

[0023] By incorporating an annular groove and a side protrusion, the annular groove increases the contact area between the airbag and the side rod, improving the sealing at the point where the side rod passes through the airbag and preventing air leakage. Meanwhile, the side protrusion further increases the contact area between the airbag and the side rod, further preventing air leakage at the point where the side rod passes through the airbag, thereby improving the service life of the airbag.

[0024] By providing an extension, the contact area between the airbag and the disc is increased, thereby improving the tightness of the connection between the airbag and the disc.

[0025] By setting a protrusion, when the wheel is released, the compressed air inside the airbag is discharged. At this time, the sealing disc moves in the opposite direction under the tension of the tension spring, causing the airbag to contract. The protrusion provides guidance for the airbag's contraction action, causing the airbag to deform at the protrusion position. At the same time, the thickness of the middle part of the protrusion is less than the thickness of the top and bottom. When the protrusion deforms, the thinner middle part can further guide the deformation of the airbag, making the airbag's contraction action smoother.

[0026] By incorporating a thickened section located on the side of the airbag closest to the wheel axle, the design of the thickened section improves the wear resistance of the contact area between the airbag and the wheel hub, thereby extending the service life of the airbag. At the same time, the design of the thickened section increases the expansion resistance of the airbag at the corresponding thickened position, providing strong support for the rapid expansion of the airbag away from the wheel axle area.

[0027] By setting a spring clip, the elastic force of the spring clip acts on the thickened part, further increasing the expansion resistance of the airbag at the corresponding thickened part. This provides reliable support for the rapid expansion of the airbag away from the axle area, effectively ensuring that the rubber sleeve on the pressure strip first presses against the wheel hub for effective positioning, and then the thickened part expands and presses against the wheel hub for repositioning. At the same time, when the compressed air inside the airbag is discharged, the spring clip returns to its undeformed state. During this process, the spring clip can prevent the thickened part located above from sagging excessively and rubbing against the wheel hub, thereby further improving the service life of the airbag.

[0028] By setting up cylinder two and a displacement sensor, after the wheel is positioned and before testing, cylinder two drives the displacement sensor to move, so that the end of the displacement sensor is in contact with the wheel surface to obtain an initial value. When the test item is completed and the next test is performed, the wheel needs to be rotated to change the wheel state and positioned by the positioning bolt. At this time, the area on the wheel to be tested is aligned with the displacement sensor. Cylinder two drives the displacement sensor to move, so that the end of the displacement sensor is in contact with the area to be tested and the test value is obtained. The test value is compared with the initial value to determine whether the test is qualified. When performing subsequent tests, the above steps are used to obtain the values ​​of different test items, and the values ​​are compared with the initial values ​​for judgment. The displacement sensor realizes the automatic measurement of values, which is convenient for operators to use. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a three-dimensional structural diagram of two parts of the cylinder of the present invention; Figure 3 This is a cross-sectional view of the pressure head of the present invention; Figure 4 This is a three-dimensional structural diagram of the V-shaped portion of the present invention; Figure 5 This is a three-dimensional structural diagram of the wheel section of the present invention; Figure 6 This is a three-dimensional structural diagram of the circular box section of the present invention; Figure 7 This is a cross-sectional view of the wheel section of the present invention; Figure 8 This is a cross-sectional view of the airbag portion of the present invention; Figure 9 This is a three-dimensional structural diagram of the circular tube section of the present invention; Figure 10 This is a three-dimensional structural diagram of the disk portion of the present invention; Figure 11 This is a three-dimensional structural diagram of the tension spring section of the present invention; Figure 12This is a three-dimensional structural diagram of the sealing plate of the present invention.

[0030] In the diagram: 1. Workbench; 2. Testing mechanism; 3. Cylinder 1; 4. Pressure sensor 1; 5. Connecting seat; 6. Pressure head; 7. Arc-shaped part; 8. V-shaped part; 9. Ball head; 10. Insert 1; 11. Insert 2; 12. Insert 3; 13. Support platform; 14. Wheel; 15. Axle; 16. Round box; 17. Pressure sensor 2; 18. Air pipe connector; 19. Socket; 20. Support seat ; 21. Round tube; 22. Round disc; 23. Airbag; 24. Extension; 25. Protrusion; 26. Thickened part; 27. Sealing plate; 28. Recessed part; 29. ​​Tension spring; 30. Side rod; 31. Pressure strip; 32. Rubber sleeve; 33. Spring; 34. Large air hole; 35. Small air hole; 36. Positioning ring; 37. Cylinder II; 38. Displacement sensor; 39. Annular groove; 40. Side protrusion.

[0031] As shown in the figure, specific structures and devices are labeled in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs, and such adjustments or modifications are still included in the scope of the appended claims. Detailed Implementation

[0032] The pressure testing device and method for a folding stroller provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0033] like Figures 1-12 As shown, an embodiment of the present invention provides a pressure testing device for a folding stroller, including a workbench 1, and further comprising: The testing mechanism 2 includes a cylinder 3 fixed to the top of the workbench 1 by a bracket. The movement of the cylinder 3 is controlled by a programmable controller. A pressure sensor 4 is fixed to the telescopic end of the cylinder 3. A connecting seat 5 is fixed to the bottom of the pressure sensor 4. A pressure head 6 is rotatably connected to the connecting seat 5 via a rotating shaft. An arc-shaped part 7, a V-shaped part 8, and a ball head 9 are fixed to the pressure head 6 respectively. The included angle between the V-shaped part 8, the ball head 9, and the arc-shaped part 7 is 120 degrees. A locking bolt is threaded to the side of the connecting seat 5 and abuts against the rotating shaft. A support platform 13 is fixed to the top of the workbench 1. A fixing rod is fixed to the top of the support platform 13. A wheel axle 15 is rotatably connected to the side of the fixing rod. A wheel 14 is fitted on the wheel axle 15 and is located above the workbench 1. A positioning component for positioning the wheel 14 is provided on the wheel axle 15. During testing, wheel 14 is fitted onto axle 15 and positioned using a positioning component. Cylinder 3 drives the arc-shaped part 7, V-shaped part 8, and ball head 9 to press down on wheel 14. Workbench 1 provides a stable installation and operating foundation for the entire testing equipment. Testing mechanism 2, in conjunction with cylinder 3 and pressure sensor 4, controls and detects the downward pressure of arc-shaped part 7, V-shaped part 8, and ball head 9, ensuring the accuracy of the test pressure. Arc-shaped part 7, V-shaped part 8, and ball head 9 on pressure head 6 can simulate three actual usage conditions of folding stroller wheel 14 running over hard protrusions, stones, and steps on the road surface. The test conditions can be switched by rotating pressure head 6 and fixing it with locking bolts. The operation is convenient. The positioning component achieves precise positioning and anti-rotation of wheel 14, ensuring that wheel 14 has no displacement or rotation during testing. The rotation design of axle 15 is adapted to the angle adjustment requirements of wheel 14, so that the three test conditions act on different areas of wheel 14 respectively. The test results are more in line with the actual use environment, providing reliable pressure data support for the structural optimization of folding stroller wheel 14.

[0034] like Figure 5 and Figure 6As shown, in this embodiment, the positioning component includes a circular box 16 fixedly fitted onto the axle 15 via a rotating lock. An air pipe connector 18 is fixed to the side of the circular box 16 away from the wheel 14. The air pipe connector 18 is connected to an air pump (not shown) via an air pipe. Multiple clamping components are provided on the side of the circular box 16 closest to the wheel 14. Three pressure sensors 17 are embedded in the inner wall of the circular box 16 corresponding to the axle 15. All three pressure sensors 17 are attached to the axle 15. After the wheel 14 is fitted onto the axle 15, the air pump operates, and compressed air enters the clamping components from the circular box 16. The clamping components expand after being vented and clamp into the hub of the wheel 14. The circular box 16 can move freely and be fixed on the axle 15 via the rotating lock, adapting to stroller wheels 14 of different widths. After adjustment, the center point of the wheel 14 coincides with the telescopic axis of the cylinder 3, ensuring that the test pressure acts perpendicularly on the wheel 14, thus improving test accuracy. The rotary lock mainly consists of a round sleeve and a spring plate. The round sleeve is threaded to the round box 16. The inner wall of the round sleeve has a bevel. Tightening the round sleeve causes the bevel of the round sleeve to press against the bevel of the spring plate, and the spring plate clamps onto the wheel axle 15, thereby fixing the position of the round box 16. Loosening the round sleeve causes the round sleeve to stop pressing against the spring plate, and the spring plate separates from the wheel axle 15 under its own elastic force. After separation, the round box 16 can move on the wheel axle 15. The air pump provides compressed air to the clamping component through the air pipe connector 18. After the clamping component is inflated, it fits tightly against the wheel hub of the wheel 14, achieving a firm positioning of the wheel 14 and preventing the wheel 14 from rotating or displacing during the test. The three pressure sensors 17 correspond one-to-one with the arc-shaped part 7, the V-shaped part 8, and the ball head 9, which can detect the stress on the wheel axle 15 in real time under the corresponding test conditions, determine whether the wheel axle 15 has bent, and simultaneously obtain dual pressure data of the wheel 14 and the wheel axle 15, making the test results more comprehensive.

[0035] like Figure 6As shown in this embodiment, three positioning rings 36 are fixed on the side of the circular box 16 away from the wheel 14. A support base 20 is fixed on the top of the support platform 13. The outer wall of the circular box 16 is rotatably connected to the top of the support base 20. Positioning bolts are threaded onto the side of the support base 20. The ends of the positioning bolts are inserted into the socket 19 located at the bottom. The three positioning rings 36 are distributed at a 120-degree angle to each other, corresponding one-to-one with the arc-shaped part 7, V-shaped part 8, ball head 9 on the pressure head 6 and the three test areas of the wheel 14, providing a reference for the angular positioning of the wheel 14. The support base 20 provides rotation support for the circular box 16. The support ensures that the circular box 16 remains coaxial with the wheel axle 15 during rotation, improving the accuracy of wheel 14 angle adjustment. The cooperation between the positioning bolt and the positioning ring 36 fixes the angle of the circular box 16, thereby achieving the angle positioning of the wheel 14 and preventing the circular box 16 from driving the wheel 14 to rotate during the test. When the positioning bolt is inserted into different positioning rings 36, the circular box 16 can drive the wheel 14 to rotate precisely 120 degrees, ensuring that the three test conditions act on different areas of the wheel 14 with consistent spacing, avoiding overlapping or close proximity of test areas that could lead to distorted test results and improving test accuracy.

[0036] like Figure 3 , Figure 4 and Figure 9 As shown in this embodiment, insert 10, insert 21, and insert 312 are fixed on the pressure head 6, respectively. The included angle between insert 10, insert 21, and insert 312 is 120 degrees. Three sockets 19 are fixed on the side of the round box 16 near the wheel 14. Insert 10, insert 21, and insert 312 are all inclined. The inclination angle of insert 21 is greater than that of insert 10, and the inclination angle of insert 312 is greater than that of insert 21. The shape of the inner wall of the three sockets 19 is adapted to the shape of insert 10, insert 21, and insert 312, respectively. The insert 10, insert 21, and insert 312 correspond one-to-one with the three sockets 19. The 120-degree angle distribution matches the arc-shaped part 7, V-shaped part 8, ball head 9 on the pressure head 6 and the three test areas of the wheel 14. The progressively increasing tilt angles of insert 10, insert 21, and insert 312, together with the three sockets 19 that are adapted to the shape, form a foolproof structure, effectively preventing the pressure head 6 from rotating while the wheel 14 does not, and preventing the three test conditions from acting on the same area of ​​the wheel 14. Structurally, this ensures the uniqueness of the test area and the consistency of the spacing, further improving the test accuracy.

[0037] like Figures 5-10As shown, in this embodiment, the clamping component includes a circular tube 21 fixed to the side of the circular box 16 near the wheel 14. The circular tube 21 is connected to the circular box 16. A disc 22 is fixed to the side of the circular tube 21 near the axle of the wheel 14. An air bladder 23 is fixed to the side of the disc 22 near the axle of the wheel 14. A large air hole 34 is opened on the disc 22 and is connected to the circular tube 21. After the air pump is turned on, compressed air enters the air bladder 23 through the circular tube 21 and the large air hole 34. The air bladder 23 inflates and clamps the wheel 14 in the hub. The circular tube 21 provides a flow channel for the compressed air, realizing the circular... The air passage of box 16 is connected to airbag 23, ensuring that the compressed air output by the air pump is stably delivered to airbag 23. Disc 22 provides a fixed installation base for airbag 23 and provides a carrier for opening large air hole 34. The large diameter design of large air hole 34 ensures that compressed air enters airbag 23 quickly, so that airbag 23 can inflate quickly. Airbag 23 is made of rubber material. After inflation, it can adaptively deform according to the shape of wheel hub 14 and fit tightly with wheel hub. It can not only achieve firm clamping and positioning, but also adapt to wheels 14 of the same type but different specifications, improving the versatility of clamping parts.

[0038] like Figure 8 , Figure 11 and Figure 12As shown, in this embodiment, a sealing plate 27 is fixed to the inner wall of the airbag 23. A recessed portion 28 is integrally formed in the central area of ​​the sealing plate 27. Small air holes 35 are provided on the recessed portion 28. The area of ​​the small air holes 35 is smaller than that of the large air holes 34. A guide rod and a tension spring 29 are fixed to the inner wall of the recessed portion 28. A guide sleeve is fixed to the side of the disc 22 near the axle of the wheel 14. The guide rod is slidably connected in the guide sleeve. The side of the tension spring 29 away from the axle of the wheel 14 is fixedly connected to the side of the disc 22 near the axle of the wheel 14. The tension spring 29 is sleeved on the guide rod and the guide sleeve. The sealing disc 27 is fitted with a side rod 30 fixed on the side away from the axle of the wheel 14. The end of the side rod 30 away from the tension spring 29 is fixed through the airbag 23 and a pressure strip 31 is fixed thereon. A rubber sleeve 32 is fixedly fitted onto the pressure strip 31 and rests against the wheel hub of the wheel 14. The sealing disc 27 divides the interior of the airbag 23 into two areas. The recessed part 28 provides a carrier for the installation and opening of the small air hole 35, the guide rod, and the tension spring 29. The area difference between the small air hole 35 and the large air hole 34 allows compressed air to first quickly enter the area of ​​the airbag 23 away from the axle 15 through the large air hole 34. The rapid expansion of this area pushes the sealing plate 27 towards the axle 15, stretching the tension spring 29. The side rod 30 drives the pressure strip 31 to move synchronously, causing the rubber sleeve 32 to first press against the hub of the wheel 14, achieving the first positioning of the wheel 14. Subsequently, compressed air slowly enters the area of ​​the airbag 23 near the axle 15 through the small air hole 35. After this area expands, it clamps the hub of the wheel 14 a second time, achieving a second positioning. This dual positioning significantly improves the clamping strength of the wheel 14, preventing the wheel 14 from rotating during testing and preventing the guide rod and guide sleeve from sliding. The sealing disc 27 is guided to move stably, thus ensuring the precise clamping position of the pressure strip 31. The tension spring 29 provides a reset force after the airbag 23 is deflated, causing the sealing disc 27, side rod 30 and pressure strip 31 to move in opposite directions, making the airbag 23 retract quickly, which facilitates the removal of the wheel 14. The side rod 30 realizes the fixed connection between the sealing disc 27 and the pressure strip 31 and transmits the moving force of the sealing disc 27. The pressure strip 31 provides a mounting carrier for the rubber sleeve 32. The rubber sleeve 32 increases the friction between the pressure strip 31 and the wheel hub of the wheel 14, improving the positioning effect.

[0039] like Figure 8 , Figure 11 and Figure 12As shown in this embodiment, an annular groove 39 is provided on the side rod 30 corresponding to the position of the airbag 23. The airbag 23 is wrapped around the inner wall of the annular groove 39. A side protrusion 40 is integrally formed on the inner wall of the airbag 23 corresponding to the side rod 30. The side protrusion 40 is wrapped around the side rod 30. The annular groove 39 increases the contact area between the side rod 30 and the airbag 23, making the fit between the airbag 23 and the side rod 30 tighter. The side protrusion 40 and the annular groove 39 cooperate to form a double sealing structure, which effectively prevents compressed air from leaking from the connection between the side rod 30 and the airbag 23, ensures the stability of the inflation pressure inside the airbag 23, and ensures the firmness of the clamping and positioning.

[0040] like Figure 8 and Figure 11 As shown, in this embodiment, the airbag 23 has an integrally formed extension 24 on the side away from the center of the wheel 14. The extension 24 is fixed to the side of the disc 22 near the axle of the wheel 14. A protrusion 25 is integrally formed on the side of the airbag 23, located between the extension 24 and the sealing disc 27. The thickness of the middle part of the protrusion 25 is less than the thickness of the top and bottom. A thickened part 26 is integrally formed on the side of the airbag 23 near the axle of the wheel 14. The outer wall of the thickened part 26 abuts against the hub of the wheel 14. Multiple spring clips 33 are fixed to the inner wall of the thickened part 26, and the spring clips 33 are fixed to the side of the sealing disc 27 near the axle of the wheel 14. The extension 24 increases the contact area between the airbag 23 and the disc 22, improving the connection strength and sealing performance, preventing the airbag 23 from falling off the disc 22 during inflation or deflation. The protrusion 25 provides a guide for the deflation of the airbag 23. The variable structure, with its central thickness less than the top and bottom thicknesses, allows the airbag 23 to deform first from the middle when it contracts, guiding the airbag 23 to contract smoothly as a whole. The thickened portion 26 increases the thickness of the contact area between the airbag 23 and the wheel hub 14, improving the wear resistance of this area and extending the service life of the airbag 23. At the same time, the thickened portion 26 increases the expansion resistance of the airbag 23 in the corresponding area, ensuring that the area of ​​the airbag 23 away from the axle 15 completes expansion and positioning first, ensuring the sequential nature of the dual positioning. Multiple springs 33 provide elastic support for the thickened portion 26, further increasing the expansion resistance of the thickened portion 26 and strengthening the sequential nature of the dual positioning. When the airbag 23 deflates and contracts, the springs 33 return to their undeformed state under their own elastic force, preventing the thickened portion 26 located at the top from sag excessively due to gravity and rubbing against the wheel hub 14, further improving the service life of the airbag 23.

[0041] like Figure 2As shown in this embodiment, a cylinder 37 is fixed on the top of the workbench 1. A displacement sensor 38 is fixed on the telescopic end of the cylinder 37. The cylinder 37 provides the displacement sensor 38 with the power to move, which can drive the displacement sensor 38 to move, so that the end of the displacement sensor 38 can smoothly and accurately fit or separate from the wheel surface of the wheel 14. Before the test, the displacement sensor 38 can accurately detect the initial value of the wheel surface of the wheel 14. After the test of each working condition is completed, the value of the wheel surface of the corresponding test area of ​​the wheel 14 can be detected again. By comparing the test value with the initial value, it is possible to quickly and accurately determine whether the wheel 14 has undergone permanent deformation under the pressure condition.

[0042] A testing method for a folding stroller, applied to the aforementioned pressure testing equipment for a folding stroller, includes the following steps: S1: Place wheel 14 onto axle 15 and clamp wheel 14 by inflating airbag 23; S2: The arc-shaped part 7 is locked downwards, and the starting cylinder 3 drives the arc-shaped part 7 to press down the wheel 14 to simulate the working condition of crushing hard protrusions; S3: Lock the ball head 9 downwards, start cylinder 3 to drive the ball head 9 to press down on wheel 14 to simulate the crushing of stones; S4: Lock the V-shaped part 8 downwards, start cylinder 3 to drive the V-shaped part 8 to press down the wheel 14 to simulate the working condition of passing through the step; S5: After the test is completed, turn off the air pump to discharge the compressed air in the airbag 23. The airbag 23 will retract and reset. Remove the wheel 14 from the axle 15. The test is over.

[0043] Working principle: Before testing, the wheel 14 is first put on the axle 15. The round box 16 is fixedly fitted on the axle 15 by a rotating lock. Loosening the rotating lock can push the round box 16 to move on the axle 15 to adapt to wheels 14 of different widths. After adjusting until the center point of the wheel 14 coincides with the telescopic axis of the cylinder 3, tighten the rotating lock so that the side of the wheel 14 fits against the side of the round box 16, completing the initial positioning of the wheel 14. Then the air pump is started, and compressed air enters the round box 16 through the air pipe connector 18, and then enters the airbag 23 through the round pipe 21 and the large air hole 34. Because the area of ​​the large air hole 34 is smaller than the area of ​​the small air hole 35, the area of ​​the airbag 23 away from the wheel axle 15 expands rapidly, pushing the sealing plate 27 to move the side rod 30 towards the wheel axle 15. The tension spring 29 is in a stretched state, and the side rod 30 drives the pressure strip 31 to move, so that the rubber sleeve 32 on the pressure strip 31 first presses into the wheel hub of the wheel 14, realizing the pressure on the vehicle. After the first positioning of wheel 14, the thickened part 26 of airbag 23 near wheel axle 15 slowly expands. The thickened part 26 on airbag 23 presses into the wheel hub of wheel 14, completing the second positioning of wheel 14 and preventing wheel 14 from rotating freely on wheel axle 15. The elastic force generated by the spring sheet 33 on the inner wall of the thickened part 26 acts on the thickened part 26, increasing the expansion resistance of airbag 23 at the corresponding thickened part 26 position, further ensuring that the area of ​​airbag 23 away from wheel axle 15 completes expansion positioning first. The extension 24 on the airbag 23 increases the contact area between the airbag 23 and the disc 22, and improves the connection strength between the airbag 23 and the disc 22. The annular groove 39 on the side rod 30 and the side protrusion 40 on the inner wall of the airbag 23 improve the sealing at the connection between the side rod 30 and the airbag 23, and prevent air leakage at this position. After the wheel 14 is positioned, the end of the positioning bolt on the side of the support seat 20 is inserted into the corresponding positioning ring 36 to prevent the wheel 14 from rotating randomly. At the same time, the cylinder 2 37 is started. The extension end of the cylinder 2 37 drives the displacement sensor 38 to move, so that the end of the displacement sensor 38 is in contact with the wheel surface of the wheel 14 to obtain the initial value of the wheel surface of the wheel 14. Then, cylinder 3 is activated, and the telescopic end of cylinder 3 moves down. Pressure sensor 4 controls the downward pressure of the arc-shaped part 7, the V-shaped part 8, and the ball head 9. The telescopic end of cylinder 3 drives the connecting seat 5 to move down, and the connecting seat 5 drives the pressure head 6 to move down, so that the arc-shaped part 7 on the pressure head 6 continuously presses down on the wheel surface of the wheel 14, simulating the working condition of the wheel 14 rolling over hard protrusions on the road surface. During this process, the insert 10 on the pressure head 6 is inserted into the corresponding socket 19. The pressure on the wheel axle 15 is transmitted to the pressure sensor 17 on the inner wall of the round box 16. The pressure sensor 17 corresponding to the position of the arc-shaped part 7 detects whether the wheel axle 15 is bent. After the test is completed, loosen the locking bolt on the side of the connecting seat 5, rotate the pressure head 6 so that the ball head 9 faces down, and then tighten the locking bolt to fix the pressure head 6. Then rotate the round box 16, which drives the wheel 14 to rotate 120 degrees. Insert the end of the positioning bolt into the next positioning ring 36 to complete the positioning of the wheel 14. At this time, the second insert 11 is aligned with the corresponding socket 19 and inserted. Because the tilt angle of the second insert 11 is greater than that of the first insert 10, the first insert 10 and the second insert 11 can only be inserted into the corresponding socket 19 to avoid the problem that the pressure head 6 rotates but the wheel 14 does not rotate and the test is applied to the same area of ​​the wheel 14. Then, cylinder 3 is started again, driving ball head 9 to continuously press down on wheel 14, simulating the working condition of wheel 14 rolling over stones. Pressure sensor 17, corresponding to the position of ball head 9, continuously detects the force on wheel axle 15. After wheel 14 rotates 120 degrees, the test area corresponding to arc part 7 on wheel 14 is aligned with the position of displacement sensor 38. Cylinder 37 is started, driving displacement sensor 38 to move, so that the end of displacement sensor 38 is attached to the wheel surface in the test area, and the test value is obtained. The test value is compared with the initial value to complete the test judgment of the working condition of wheel 14 rolling over hard protrusions on the road surface. After the test of the simulated wheel 14 crushing stones is completed, the pressure head 6 is rotated again so that the V-shaped part 8 faces down. The round box 16 is rotated to drive the wheel 14 to rotate 120 degrees again. The end of the positioning bolt is inserted into the last positioning ring 36 to complete the positioning of the wheel 14. At this time, the insertion strip 3 12 is aligned with the corresponding socket 19 and inserted. Because the tilt angle of the insertion strip 3 12 is greater than the tilt angle of the insertion strip 2 11, the insertion strip 3 12 can only be inserted into the corresponding socket 19 to further ensure that the test area is not repeated. Then, the cylinder 2 37 is started again so that the end of the displacement sensor 38 is attached to the test area of ​​the ball head 9 on the wheel 14 to complete the test judgment of the wheel 14 crushing stones. Then, cylinder 3 is started, which drives the V-shaped part 8 to continuously press down on the wheel 14 and pause briefly to simulate the working condition of the wheel 14 passing over the step. The pressure sensor 17 corresponding to the position of the V-shaped part 8 detects the force on the wheel axle 15. After the test is completed, the wheel 14 is rotated 120 degrees, and then cylinder 37 is started. Cylinder 37 drives the displacement sensor 38 to move, so that the end of the displacement sensor 38 is attached to the test area of ​​the V-shaped part 8 on the wheel 14 to obtain the test value. The test value is compared with the initial value to complete the test judgment of this working condition. After all three working condition tests are completed, the air pump is turned off, the compressed air inside the airbag 23 is discharged, and the sealing plate 27 moves in the opposite direction under the tension of the tension spring 29, causing the airbag 23 to contract. The protrusion 25 on the airbag 23 provides guidance for the contraction action of the airbag 23. The thickness of the middle part of the protrusion 25 is less than the thickness of the top and bottom, which further guides the deformation of the airbag 23, making the contraction action of the airbag 23 smoother. The spring 33 returns to the undeformed state under its own elastic force, thereby assisting the contraction of the thickened part 26, preventing the thickened part 26 located above from drooping excessively and rubbing against the wheel hub of the wheel 14, and improving the service life of the airbag 23. The wheel 14 can then be removed from the axle 15, completing the entire testing process. Throughout the process, the arc-shaped part 7, the V-shaped part 8, and the ball head 9 simulate different pressure conditions of the wheel 14 in actual use. Multiple positioning ensures that the spacing of the test area of ​​the wheel 14 is consistent. Pressure sensor 1 4, pressure sensor 2 17, and displacement sensor 38 achieve precise pressure control and numerical detection, making the test results more consistent with the actual use environment and providing reliable data support for product optimization.

[0044] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A pressure testing device for a folding stroller, characterized in that, Including the workbench (1), it also includes: The testing mechanism (2) includes a cylinder (3) fixed to the top of the workbench (1) by a bracket. A pressure sensor (4) is fixed to the telescopic end of the cylinder (3). A connecting seat (5) is fixed to the bottom of the pressure sensor (4). A pressure head (6) is rotatably connected to the connecting seat (5) through a rotating shaft. An arc-shaped part (7), a V-shaped part (8) and a ball head (9) are fixed on the pressure head (6). The included angle between the V-shaped part (8), the ball head (9) and the arc-shaped part (7) is 120 degrees. A locking bolt is threaded on the side of the connecting seat (5). The locking bolt abuts against the rotating shaft. A support platform (13) is fixed to the top of the workbench (1). A fixing rod is fixed to the top of the support platform (13). A wheel axle (15) is rotatably connected to the side of the fixing rod. A wheel (14) is fitted on the wheel axle (15). The wheel (14) is located above the workbench (1). A positioning component for positioning the wheel (14) is provided on the wheel axle (15). During the test, the wheel (14) is placed on the axle (15) and positioned by the positioning component. The cylinder (3) drives the arc part (7), V-shaped part (8) and ball head (9) to press on the wheel (14) respectively.

2. The pressure testing device for a folding stroller according to claim 1, characterized in that, The positioning component includes a round box (16) fixedly fitted onto the axle (15) by a rotating lock. An air pipe connector (18) is fixed on the side of the round box (16) away from the wheel (14). The air pipe connector (18) is connected to an air pump through an air pipe. Multiple clamping parts are provided on the side of the round box (16) close to the wheel (14). Three pressure sensors (17) are embedded in the inner wall of the round box (16) corresponding to the axle (15). The three pressure sensors (17) are all attached to the axle (15). After the wheel (14) is fitted onto the axle (15), the air pump operates, and compressed air enters the clamping parts from the round box (16). After the clamping parts are ventilated, they expand and clamp into the hub of the wheel (14).

3. The pressure testing device for a folding stroller according to claim 2, characterized in that, Three positioning rings (36) are fixed on the side of the round box (16) away from the wheel (14). A support seat (20) is fixed on the top of the support platform (13). The outer wall of the round box (16) is rotatably connected to the top of the support seat (20). A positioning bolt is threaded on the side of the support seat (20). The end of the positioning bolt is inserted into the socket (19) located at the bottom.

4. The pressure testing device for a folding stroller according to claim 2, characterized in that, The pressure head (6) is fixed with insert one (10), insert two (11) and insert three (12), and the included angle between insert one (10), insert two (11) and insert three (12) is 120 degrees. The round box (16) is fixed with three sockets (19) on the side near the wheel (14). Insert one (10), insert two (11) and insert three (12) are all inclined. The inclination angle of insert two (11) is greater than that of insert one (10), and the inclination angle of insert three (12) is greater than that of insert two (11). The shape of the inner wall of the three sockets (19) is adapted to the shape of insert one (10), insert two (11) and insert three (12).

5. The pressure testing device for a folding stroller according to claim 2, characterized in that, The clamping component includes a round tube (21) fixed to the side of the round box (16) near the wheel (14). The round tube (21) is connected to the round box (16). A disc (22) is fixed to the side of the round tube (21) near the axle of the wheel (14). An air bladder (23) is fixed to the side of the disc (22) near the axle of the wheel (14). A large air hole (34) is opened on the disc (22). The large air hole (34) is connected to the round tube (21). After the air pump is running, compressed air enters the air bladder (23) through the round tube (21) and the large air hole (34). The air bladder (23) expands and clamps the wheel (14) in the hub.

6. The pressure testing device for a folding stroller according to claim 5, characterized in that, The inner wall of the airbag (23) is fixed with a sealing plate (27). The central area of ​​the sealing plate (27) is integrally formed with a recess (28). Small air holes (35) are opened on the recess (28). The area of ​​the small air holes (35) is smaller than that of the large air holes (34). A guide rod and a tension spring (29) are fixed on the inner wall of the recess (28). A guide sleeve is fixed on the side of the disc (22) near the axle of the wheel (14). The guide rod is slidably connected in the guide sleeve. The tension spring (29) is away from the wheel. (14) One side of the axle is fixedly connected to the side of the disc (22) near the axle of the wheel (14), and the tension spring (29) is sleeved on the guide rod and the guide sleeve. The side of the sealing disc (27) away from the axle of the wheel (14) is fixed with a side rod (30). The end of the side rod (30) away from the tension spring (29) is fixedly inserted through the airbag (23) and fixed with a pressure strip (31). A rubber sleeve (32) is fixedly sleeved on the pressure strip (31), and the rubber sleeve (32) abuts against the hub of the wheel (14).

7. The pressure testing device for a folding stroller according to claim 6, characterized in that, An annular groove (39) is provided on the side rod (30) at the position corresponding to the airbag (23). The airbag (23) is wrapped in the inner wall of the annular groove (39). A side protrusion (40) is integrally formed on the inner wall of the airbag (23) at the position corresponding to the side rod (30). The side protrusion (40) is wrapped in the side rod (30).

8. The pressure testing device for a folding stroller according to claim 6, characterized in that, The airbag (23) has an integrally formed extension (24) on the side away from the center of the wheel (14). The extension (24) is fixed on the side of the disc (22) near the axle of the wheel (14). The side of the airbag (23) has an integrally formed protrusion (25). The protrusion (25) is located between the extension (24) and the sealing disc (27). The thickness of the middle part of the protrusion (25) is less than the thickness of the top and bottom. The side of the airbag (23) near the axle of the wheel (14) has an integrally formed thickened part (26). The outer wall of the thickened part (26) abuts against the hub of the wheel (14). The inner wall of the thickened part (26) is fixed with a plurality of spring pieces (33). The spring pieces (33) are fixed on the side of the sealing disc (27) near the axle of the wheel (14).

9. The pressure testing device for a folding stroller according to claim 1, characterized in that, The top of the workbench (1) is fixed with cylinder 2 (37), and the telescopic end of cylinder 2 (37) is fixed with displacement sensor (38).

10. A testing method for a folding stroller, using the pressure testing equipment for a folding stroller as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Place the wheel (14) on the axle (15) and clamp the wheel (14) by inflating the airbag (23). S2: The arc-shaped part (7) is locked downwards, and the cylinder 1 (3) is started to drive the arc-shaped part (7) to press down the wheel (14) to simulate the working condition of crushing hard protrusions; S3: Lock the ball head (9) downwards, start cylinder one (3) to drive the ball head (9) to press down the wheel (14) to simulate the crushing of stones; S4: Lock the V-shaped part (8) downwards, start cylinder one (3) to drive the V-shaped part (8) to press down the wheel (14) to simulate the working condition of passing through the step; S5: After the test is completed, turn off the air pump to discharge the compressed air in the airbag (23), the airbag (23) will retract and reset, and the wheel (14) will be removed from the axle (15). The test is over.

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