A centrifugal testing device and method

Abstract

This invention provides a centrifuge testing device and method. The centrifuge testing device includes a rotating arm, a drive mechanism, a second cable adapter box, a fixed bracket, and a first cable adapter box. A test computer and a product power supply test box are mounted on the upper end of the fixed bracket. The product power supply test box has a communication connector and a power supply connector. A product communication cable is connected to the communication connector, and a product power supply cable is connected to the power supply connector. A current collector is located inside the fixed bracket. The first cable adapter box is electrically connected to the product power supply test box and the current collector ring via power supply cables. The current collector ring is connected to the second cable adapter box via an external cable. The second cable adapter box is connected to a power supply via a parallel power supply adapter cable. The test computer is electrically connected to the product power supply test box. This invention ensures normal data acquisition and effectively solves the problem of data frame loss by preventing communication interference from the current collector ring.

Description

Technical Field

[0001] This invention relates to the field of reliability testing technology, and in particular to a centrifugal testing device and method. Background Technology

[0002] Centrifugation (acceleration) testing is widely used in industries such as defense, aviation, aerospace, communications, and electronics. Products used on transport vehicles, aerial vehicles, rotating machinery, and projectile objects need to operate under significant acceleration conditions. Currently, acceleration testing is primarily simulated using centrifuges. The sample is mounted on a mounting plane of a rotating arm at a certain radius from the main shaft. As the arm rotates at a constant speed driven by a motor and reducer, the sample on the arm experiences constant centrifugal acceleration. By changing the mounting radius of the sample and the rotation speed of the arm, the desired acceleration value can be obtained. The test assesses whether the sample can function normally under acceleration conditions and whether structural damage occurs. In communication and electronic products, data collection is necessary during centrifugation (acceleration) testing to analyze the data and determine if the product can function normally under acceleration conditions.

[0003] During the experiment, the centrifuge (rotating arm) rotates at high speed, requiring separation of the operator and the machine, and enhanced safety precautions. In conventional mode, test data during centrifugation is primarily transmitted and communicated via conductive slip rings (current collector rings). The conductive slip rings transmit electrical current, test sample control signals, and various feedback signals from outside the inertial loading device to the rotating arm, and transmit information used to test the test sample's operating status from the rotating arm to outside the inertial loading device system, thus achieving communication transmission of working signals, control signals, and test signals.

[0004] Early electronic products used relatively simple signals, primarily typical analog signals. With technological advancements, electronic product signals have become increasingly complex, now including RS422, HDLC, 1553B, and fiber optic signals. Conductive slip rings cannot meet the requirements for 1553B and fiber optic signal transfer and transmission, as well as high-speed data acquisition. Data passing through the slip ring is frequently interfered with, resulting in frame loss and severe data distortion, significantly impacting the analysis of experimental results.

[0005] The existing solution involves using specialized signal loops for various signals, but this is expensive, costing around 400,000 yuan for a single signal loop system. Furthermore, it has poor versatility and will no longer be suitable for complex communication signals to be encountered in the future. Moreover, this method is difficult to retrofit or modify into existing centrifuges, making widespread application challenging. Summary of the Invention

[0006] The purpose of this invention is to provide a centrifugation testing device and method that improves the anti-interference capability of data acquisition and has a low cost.

[0007] The technical solution of the present invention is as follows: a centrifugal testing device, comprising a rotating arm, a driving mechanism for driving the rotating arm to rotate, a second cable adapter box, a fixed bracket installed in the middle of the rotating arm, and a first cable adapter box disposed beside the fixed bracket. A testing computer and a product power supply testing box are disposed at the upper end of the fixed bracket. The product power supply testing box is provided with a communication connector and a power supply connector. A product communication cable is connected to the communication connector, and a product power supply cable is connected to the power supply connector. A current collector is disposed inside the fixed bracket. The first cable adapter box is electrically connected to the product power supply testing box and the current collector via power supply cables. The current collector is connected to the second cable adapter box via an external cable. The second cable adapter box is connected to a power supply via a power supply parallel adapter cable. The testing computer is electrically connected to the product power supply testing box.

[0008] Preferably, the current collecting ring is mounted on a fixed bracket by a fixing device fastener, and the fastener is also fixed on the rotating arm.

[0009] Preferably, the power supply parallel adapter cable consists of at least three parallel wires drawn from a positive or negative power supply terminal, and the length of each wire is not less than 1m.

[0010] Preferably, the fixed bracket includes a base plate, a top plate located above the base plate, a plurality of transition posts connecting the base plate and the top plate, and a welding plate disposed on the top plate. The product power supply test box is placed on the top plate, and the current collector is placed between the top plate, the base plate, and the transition posts.

[0011] Preferably, the base plate is provided with a plurality of support plates arranged in a circular pattern, with a concave arc between each pair of support plates, and each support plate is provided with a transition post.

[0012] Preferably, the base plate has a first through hole in the middle, and the side wall of the base plate forming the first through hole has a radially penetrating notch.

[0013] Preferably, the top plate has a second through hole in the middle, and the welding plate is embedded in the second through hole.

[0014] Preferably, the centrifugal testing device further includes multiple clamping bars connected to the fixed bracket, the multiple clamping bars being arranged in a crisscross pattern, and the product power supply test box and test computer being placed inside the clamping bars.

[0015] Preferably, the clamping strip includes two opposing first plates and a second plate connected to one end of the two first plates. A third plate is provided at the other end of each of the two first plates. The two third plates are disposed away from each other. The third plate is connected to a fixed bracket. The lower surface of the second plate is in contact with the test computer.

[0016] The present invention also provides a method for testing using the above-described centrifugation testing device, comprising:

[0017] Install the mounting bracket, current collector ring, product power supply test box, and test computer on the rotating arm; then turn on the test computer; install the product at one end of the rotating arm and install a counterweight of the same weight at the other end of the rotating arm; connect the cable between the product and the product power supply test box; perform an insulation test on each of the first terminals of the first cable adapter box on the rotating arm, and determine whether it is qualified based on the insulation resistance value. If it is unqualified, remove the unqualified first terminal. Connect the qualified first terminal to the corresponding second terminal on the second cable adapter box with an external cable, and use an instrument to measure whether the two are connected. If they are not connected, remove the product.

[0018] Connect the product power supply test box and the first cable adapter box using a power supply cable, connect the second cable adapter box and the power supply using a power supply parallel adapter cable, and turn on the power supply; first perform a static test on the product, and after confirming that the product data acquisition is normal, start the drive mechanism to open the rotating arm for testing;

[0019] Start the drive mechanism to rotate the arm. After the test in each direction is completed, view the collected data through the test computer and save it; until the test is completed.

[0020] Compared with related technologies, the beneficial effects of the present invention are as follows:

[0021] 1. Because the acceleration value at the center of the rotating arm is very small, the centrifugal testing device places the product power supply test box and the test computer in a fixed bracket at the center of the rotating arm, so that the acquired signal does not need to be transferred through the current collector ring and is directly transmitted to the test computer. Communication is not affected by the current collector ring, thus ensuring normal data acquisition and effectively solving the problem of data frame loss.

[0022] Second, since the acceleration value at the center of the swing arm is very small, the fixing device and the fixing bracket are installed at the center of the swing arm by fasteners. During the acceleration test, the centrifugal force at this position is very small, and the fasteners are not easy to loosen. Moreover, the two are fixed by fasteners, which does not require additional modification or drilling on the swing arm and will not damage the structural strength of the swing arm.

[0023] 3. The power supply is connected to the second cable junction box through a power supply parallel adapter cable. The power supply is transferred to the terminal of the first cable junction box on the rotating arm through a slip ring. The redundancy design eliminates the hidden danger of unstable voltage in the product power supply test box caused by the poor performance of some slip rings during the acceleration test.

[0024] IV. The centrifugation testing device has a simple structure, low cost, convenient connection and disassembly, and good versatility. It can be widely used in centrifugation tests of products with high data acquisition requirements. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the centrifugation testing device provided by the present invention;

[0026] Figure 2 for Figure 1 A partially enlarged schematic diagram of the mounting position of the fixed bracket;

[0027] Figure 3 This is a wiring diagram of the centrifugal testing device provided by the present invention;

[0028] Figure 4 This is a schematic diagram of the fixed support structure;

[0029] Figure 5 for Figure 4 A structural diagram of the base plate and transition column;

[0030] Figure 6 for Figure 4 A schematic diagram of the top plate structure;

[0031] Figure 7 for Figure 4 A schematic diagram of the structure of the clamping strip in the middle;

[0032] Figure 8 A schematic diagram of the power supply parallel connection wiring (I);

[0033] Figure 9 Schematic diagram of the power supply parallel connection connection (II).

[0034] In the attached diagram: 1. Swing arm; 2. Drive mechanism; 21. Reducer; 22. Motor; 3. Fixed bracket; 31. Base plate; 311. Support plate; 312. Concave arc; 313. First through hole; 314. Notch; 32. Top plate; 321. Second through hole; 322. Lightening hole; 33. Adapter post; 34. Welding plate; 4. First cable adapter box; 41. First terminal post; 5. Product power supply test box; 51. Communication connector; 52. Power supply connector; 53. Power connector; 54. USB connector; 6. Product communication... 7. Power supply cable; 8. Parallel power supply adapter cable; 9. Power supply cable; 10. USB cable; 11. Second cable junction box; 111. Second terminal block; 12. External cable; 13. Internal cable; 14. Counterweight; 15. Power supply; 16. Test computer; 17. Current collector ring; 18. Clamping strip; 181. First plate; 182. Second plate; 183. Third plate; 19. Fixing ring; 20. Fixing device; 200. Sample; 201. Communication connector; 202. Power supply connector. Detailed Implementation

[0035] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" used below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0036] like Figure 1 , Figure 2 As shown, the centrifugal testing device provided in this embodiment includes a rotating arm 1, a driving mechanism 2, a fixed bracket 3, a first cable adapter box 4, a product power supply test box 5, a product communication cable 6, a product power supply cable 7, a power supply parallel adapter cable 8, a power supply cable 9, a USB cable 10, a second cable adapter box 11, an external cable 12, an internal cable 13, a counterweight 14, a power supply 15, a test computer 16, a current collector ring 17, a clamping strip 18, a fixing ring 19, and a fixing device 20.

[0037] The drive mechanism 2 includes a motor 22 and a reducer 21 connected to the motor shaft of the motor 22. The output shaft of the reducer 21 is connected to the middle of the rotating arm 1. The fixing device 20 is used to install the collector ring 17. The fixing device 20 is placed inside the fixing bracket 3. The fixing bracket 3 and the fixing device 20 are installed at the center of the rotating arm 1 by fasteners.

[0038] like Figure 4 As shown, the fixed bracket 3 is made of stainless steel and includes a base plate 31, a top plate 32, a transition column 33, and a welding plate 34. Figure 5 As shown, the base plate 31 is 100mm thick and has six circumferentially arranged support plates 311, with a concave arc 312 between every two support plates 311. A first through hole 313 is provided in the center of the base plate 31, and a radially penetrating notch 314 is provided on the sidewall of the base plate 31 forming the first through hole 313. The notch 314 does not affect the routing of the cable 13 connected to the first cable junction box 4 within the current collector ring 17. Figure 3 As shown, each of the support plates 311 is provided with a connecting post 33. The upper end of the connecting post 33 is connected to the top plate 32. The diameter of the connecting post 33 is not less than 20mm, and its height can be adjusted according to the height of the fixing device 20.

[0039] like Figure 6 As shown, the top plate 32 has a thickness of 8mm, with a second through hole 321 located in its center, and multiple light-reducing holes 322 surrounding the second through hole 321. Figure 3 As shown, the repair welding plate 34 (2mm thick) is embedded in the second through hole 321.

[0040] like Figure 2As shown, the current collector ring 17 and the fixing device 20 are placed in multiple adapter posts 33. The product power supply test box 5 and the test computer 16 are placed on the upper end of the top plate 32 and then fixed by the clamping strip 18. Figure 7 As shown, there are multiple clamping strips 18 arranged in a crisscross pattern. Each strip includes two opposing first plates 181 and a second plate 182 connected to one end of each first plate 181. A third plate 183 is respectively provided at the other end of each first plate 181. The two third plates 183 are positioned far apart from each other. The third plates 183 are bolted to the top plate 32. The lower surface of the second plate 182 is in contact with the test computer 16 (e.g., ...). Figure 2 As shown), to fix the test computer 16 and the product power supply test box 5.

[0041] like Figure 1 As shown, the centrifugation testing device is placed inside centrifuge chamber A, and the power supply 15 is placed in centrifuge control chamber B, which is located outside centrifuge chamber A. Centrifuge control chamber B is equipped with a second cable junction box 11 and power supply 15.

[0042] like Figure 1 , Figure 3 As shown, at least two first cable adapter boxes 4 are provided on the rotating arm 1. Each first cable adapter box 4 has a first terminal block 41. The product power supply test box 5 is equipped with a communication connector 51, a power connector 52, a power supply connector 53, and a USB connector 54. The product communication cable 6 and the product power supply cable 7 are both fixed to one side of the rotating arm 1 by a retaining ring 19. The product communication cable 6 connects the test sample 200 to the communication connector 51, and the product power supply cable 7 connects the test sample 200 to the power supply connector 52. The power supply connector 53 is connected to the first terminal block 41 on one of the first cable adapter boxes 4 via a power supply cable 9. The first cable adapter box 4 is connected to a current collector ring 17 via an internal cable 13. The USB cable 10 connects the test computer 16 and the USB connector 54.

[0043] The current collector ring 17 is connected to the second cable adapter box 11 via an external cable 12, and the second terminal 111 on the second cable adapter box 11 is connected to the power supply 15 via a power supply parallel adapter cable 8. Figure 8 , Figure 9 As shown, at least three wires are led out from the positive and negative terminals of the power supply and connected in parallel, and the length of each cable is generally not less than 1m.

[0044] The centrifugal testing device of this utility model consists of two parts: a centrifugal testing fixing device and a power supply conversion system. The centrifugal testing fixing device is composed of a fixing bracket 3 and a clamping strip 18. The fixing device 20 of the current collector ring is tightened to the center position of the rotating arm 1 by fasteners. The base plate 31 of the fixing bracket 3 is designed with fixing holes with the same positions as the fixing device 20. During installation, first unscrew the bolts on the fixing device 20, then install the fixing bracket, adjust the position of the base plate 31 so that the holes on it coincide with the holes on the fixing device 20, and then install the bolts. Then, use the clamping strip 18 to fix the test computer 16 and the product power supply test box 5 to the output shaft of the reducer 21, which is the rotation center position of the rotating arm 1. The power supply conversion system transfers the power supply 15 in the centrifuge control room B to the first terminal 41 via the power supply parallel conversion cable 8 and the current collector ring 17. One end of the power supply cable 9 is connected to the first terminal 41, and the other end is connected to the product power supply test box 5. The test computer 16 and the product power supply test box 5 are connected by a USB cable 10, so that the acquired signal is directly transmitted to the test computer 16 without going through the current collector ring 17. The power supply cable 9 can also adopt the same structure as the power supply parallel conversion cable 8.

[0045] The present invention also provides a method for testing using the above-described centrifugation testing device, comprising the following steps:

[0046] Step S1, as follows Figure 1 As shown, the fixed bracket 3 and the collector ring 17 are installed on the rotating arm 1.

[0047] Step S2: Power on the test computer 16 (selected as a ruggedized laptop) and set it to external display mode. Set the system power to so that the computer does not take any action after the laptop screen is closed, so that it can work normally through the external keyboard and monitor after the laptop is closed.

[0048] Step S3: Mount the test computer 16 and the product power supply test box 5 onto the fixed bracket 3 using the clamping strip 18 and bolts, and place a thin layer of sponge between the product power supply test box 5 and the test computer 16 for anti-slip. The clamping strip 18 must not obstruct any parts of the product power supply test box 5 and the test computer 16 that require external connectors or communication cables.

[0049] In step S4, place the test sample 200 at one end of the rotating arm 1, and place a counterweight 14 of the same weight at the other end of the rotating arm 1. Connect the product communication cable 6 to the communication connector 201 of the test sample 200, and connect the product power supply cable 7 to the power supply connector 202 of the test sample 200. The product communication cable 6 and the product power supply cable 7 pass through the fixing ring 19 and are secured with cable ties to prevent the cables from moving during the test.

[0050] Step S5: Perform an insulation test on each first terminal 41 using a 100V megohmmeter. The insulation resistance value should generally be no less than 50MΩ; otherwise, the first terminal 41 that does not meet the requirements should be discarded. Connect the qualified first terminal to the corresponding second terminal 111 on the second cable adapter box 11 using an external cable 12 ("corresponding" means that the serial number of the first terminal on the first cable adapter box corresponds to the serial number of the second terminal on the second cable adapter box), and use an instrument (4.5-digit multimeter) to measure whether the two are connected. If the corresponding terminals at both ends are not connected, the point that does not meet the requirements should be discarded.

[0051] Step S6: Connect the power supply 15 using the power supply parallel adapter cable 8. Short-circuit the three positive and three negative terminals on the first cable junction box 4 using the power supply parallel adapter cable 8. Turn on the power supply 15, adjust the voltage, and use a 4.5-digit multimeter to measure the voltage of the corresponding first terminal 41 on the first cable junction box 4 on the rotating arm 1. If voltage loss occurs due to the long power cord, the power supply voltage in the centrifuge control room A should be appropriately increased. After adjustment, turn off the power supply 15 and disconnect the short-circuited power supply parallel adapter cable 8.

[0052] Step S7: Connect the product power supply test box 5 and the corresponding first terminal 41 on the first cable adapter box 4 using the power supply cable 9. After confirming that there are no errors, turn on the power supply 15. Connect the test computer 16 using an external monitor and keyboard. First, perform a static test on the sample 200. After confirming that the product acquisition is normal, disconnect the external monitor and keyboard. After personnel and unnecessary equipment have been removed from the centrifuge control room A, start the drive mechanism 2 to conduct the centrifugation test.

[0053] Step S8: Start the drive mechanism 2 to rotate the arm 1. After the test in each direction is completed, wait for the arm 1 to stop and then connect the test computer 16 to an external monitor and keyboard to view the data. After confirming that there are no abnormalities in the data, save the test data and complete the test.

[0054] Step S9: After all directions of testing are completed, disassemble the test sample 200, product power supply test box 5, test computer 16, counterweight 14, clamping strip 18 and all cables. The fixing bracket 3 can remain in place.

[0055] The centrifuge testing device of the present invention only needs to transfer the voltage and current with strong anti-interference capability to the first cable junction box at the center of the rotating arm through the slip ring. All acquired signals can be directly transmitted to the test computer without passing through the slip ring for testing. This can avoid frame loss during the transmission of various complex signal data through the slip ring during centrifugation test, thus ensuring the test quality.

[0056] The fixed bracket is equipped with weight-reducing holes, which not only reduce weight, but also ensures structural strength through welding during assembly. This allows the fixed bracket to achieve the required height without being bulky, enabling it to withstand electromagnetic interference from the drive mechanism after the test computer and product power supply test box are installed, further enhancing the anti-interference capability of data acquisition.

[0057] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A centrifugation testing device, comprising a rotating arm and a drive mechanism for driving the rotating arm to rotate, characterized in that, It also includes a second cable adapter box, a fixed bracket installed in the middle of the rotating arm, and a first cable adapter box located beside the fixed bracket. The upper end of the fixed bracket is equipped with a test computer and a product power supply test box. The product power supply test box has a communication connector and a power supply connector. A product communication cable is connected to the communication connector, and a product power supply cable is connected to the power supply connector. A current collector is located inside the fixed bracket. The first cable adapter box is electrically connected to the product power supply test box and the current collector via power supply cables. The current collector is connected to the second cable adapter box via an external cable. The second cable adapter box is connected in parallel with the power supply. The adapter cable is connected to the power supply, and the test computer is electrically connected to the product power supply test box. The fixed bracket includes a base plate, a top plate located above the base plate, multiple adapter posts connecting the base plate and the top plate, and a repair welding plate on the top plate. The product power supply test box is placed on the top plate, and the current collector ring is placed between the top plate, the base plate, and the adapter posts. Multiple support plates are arranged in a circular pattern on the base plate, with a concave arc between every two support plates. Each support plate is provided with one adapter post. The base plate has a first through hole in the middle, and the top plate has a second through hole in the middle. The repair welding plate is embedded in the second through hole. The current collecting ring is installed inside the fixed bracket by a fixing device, which is located at the center of the rotating arm.

2. The centrifugation testing device according to claim 1, characterized in that, The power supply parallel connection cable consists of at least three parallel wires drawn from a positive or negative power supply terminal, each wire being at least 1m long.

3. The centrifugation testing device according to claim 1, characterized in that, The bottom plate has a radially penetrating notch on the side wall that forms the first through hole.

4. The centrifugation testing device according to claim 1, characterized in that, It also includes multiple clamping strips connected to the fixed bracket, the multiple clamping strips being arranged in a crisscross pattern, and the product power supply test box and test computer being placed inside the clamping strips.

5. The centrifugation testing apparatus according to claim 4, characterized in that, The clamping strip includes two opposing first plates and a second plate connected to one end of the two first plates. A third plate is provided at the other end of each of the two first plates. The two third plates are positioned far apart from each other. The third plate is connected to a fixed bracket. The lower surface of the second plate is in contact with the test computer.

6. A method for testing using the centrifugation testing apparatus as described in any one of claims 1-5, characterized in that, include: Mount the mounting bracket, current collector ring, product power supply test box, and test computer onto the rotating arm; then power on the test computer. Install the product at one end of the rotating arm and a counterweight of the same weight at the other end of the rotating arm; and connect the cable between the product and the product power supply test box. Insulation tests are performed between the first terminals of the first cable junction box on the rotating arm, and the insulation resistance value is used to determine whether they are qualified. If they are unqualified, the unqualified first terminal is removed. The qualified first terminal is connected to the corresponding second terminal on the second cable junction box with an external cable, and the connection between the two is measured with an instrument. If they are not connected, they are removed. Connect the product power supply test box and the first cable adapter box using a power supply cable, connect the second cable adapter box and the power supply using a power supply parallel adapter cable, and turn on the power supply. First, conduct static testing on the product to confirm that the product collection is normal. Then, start the drive mechanism to open the rotating arm for testing. Start the drive mechanism to rotate the arm. After the test in each direction is completed, view the collected data through the test computer and save it; until the test is completed.

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