Cable performance measuring equipment

Abstract

The invention discloses cable performance measurement equipment, and relates to the technical field of measurement equipment, the cable performance measurement equipment comprises test equipment, a motor and a clamping table, a clamping plate is arranged on the clamping table in a radial sliding manner, the front surface of the clamping plate is connected with a sliding plate through an elastic member, the sliding plate is hollow and is provided with an air hole, and the back surface of the clamping plate is provided with an air bag. The air bag is communicated with the interior of the sliding plate, and the distance between the other end of the air bag and the sliding plate is fixed; according to the cable clamping device, when a cable is clamped, a pressing plate is used for pushing a sliding block, a sliding plate, a compression spring and stretching an air bag, so that the air pressure at the communicating position of the air bag and the sliding plate is reduced, then negative pressure is generated in an air hole, and the air pressure difference is matched with mechanical clamping force, so that cable clamping is upgraded from pure mechanical clamping to mechanical and air pressure adsorption cooperative dual stable clamping; the shaking and displacement of the cable in the test process are effectively reduced, and the test accuracy is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring equipment, and in particular to a cable performance measuring equipment. Background Art

[0002] In today's booming electrical and communications industry, cables are key components for transmitting power and signals, so the accuracy and efficiency of their performance testing are crucial.

[0003] In the clamping process, traditional cable performance measurement equipment has to increase the mechanical clamping force to ensure that the cable does not slip during testing. This directly leads to excessive squeezing of the cable sheath, causing wear and deformation of the sheath, and even damage to the internal core wire, greatly increasing the cable loss cost. For some high-cost, high-performance special cables, the loss is even more significant.

[0004] In view of this, this application is hereby filed. Summary of the invention

[0005] The object of the present invention is to provide a cable performance measurement device to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides a cable performance measuring device, including a testing device, a motor, and a clamping table. A clamping plate is radially slidably arranged on the clamping table. The front side of the clamping plate is connected to a skateboard through an elastic member. The skateboard is hollow and has air holes on it. An airbag is arranged on the back side of the clamping plate. The airbag is connected to the interior of the skateboard, and the other end of the airbag is fixed at a distance from the skateboard.

[0007] Furthermore, a slider is slidably connected in the clamping plate, one end of the slider is fixedly connected to the sliding plate, the other end of the slider is fixedly connected to a pressure plate, and the pressure plate is fixedly connected to the airbag.

[0008] Furthermore, a punching hole coinciding with the position of the airbag is formed on the splint, and a connecting tube is connected to the part where the airbag and the punching hole coincide, and the other end of the connecting tube is connected to the slide plate. The connecting tube is a spring tube, and a spring is provided between the slide plate and the splint, and the spring is coaxial with the punching hole.

[0009] Furthermore, the airbag has splints distributed at four corners between the splint and the pressure plate.

[0010] Furthermore, the slide plate is a toothed plate, and the air holes are opened on the toothed wall of the slide plate.

[0011] Furthermore, a rotating plate is rotatably connected to the clamping table, a radial groove is provided on the top surface of the clamping table, a tangential groove is provided on the top surface of the rotating plate, the number of the radial grooves and the tangential grooves are adapted and the positions are staggered, and the clamping plate is slidably connected at the intersection of the radial grooves and the tangential grooves.

[0012] Furthermore, a driving hole is provided on the clamping table, a driving column is connected to the bottom surface of the rotating plate, a worm gear is provided on the driving column, a rotating rod is inserted in the clamping table, one end of the rotating rod located on the inner side of the clamping table is fixedly connected to a worm, the worm gear is meshed with the worm gear, the other end of the rotating rod is provided on the outer side of the clamping table, and a knob is provided on the other end of the rotating rod.

[0013] Furthermore, a connecting shaft is provided between the rotating plate and the radial groove, and the two ends of the connecting shaft are respectively connected to a tangential block and a radial block, the tangential block is slidably connected in the radial groove, the radial block is slidably connected in the tangential groove, and the top surface of the radial block is fixedly connected to the bottom surface of the clamping plate.

[0014] Furthermore, a motor is provided on the top surface of the testing device, and a screw is connected to the output shaft of the motor. A straight slot is opened in the testing device, and a straight slot block is slidably connected in the straight slot, and the straight slot block is threadedly connected to the screw. A mobile platform is provided on the straight slot block, and a fixed platform is provided on the top surface of the testing device. The clamping platform has two platforms respectively installed on the mobile platform and the fixed platform.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, when clamping the cable, the pressure plate is used to push the slider and the slide plate, compressing the spring and stretching the airbag, so that the air pressure at the connection between the airbag and the slide plate is reduced, and then negative pressure is generated in the air hole. With the help of the air pressure difference and the mechanical clamping force, the cable clamping is upgraded from simple mechanical clamping to a dual stable support of mechanical and air pressure adsorption, which effectively reduces the shaking and displacement of the cable during the test and ensures the accuracy of the test.

[0016] In the present invention, the clamping plate is guided by radial and tangential staggered grooves, so that the cable can be firmly fixed in multiple dimensions, and both axial tensile force and radial torsional force can be effectively resisted, thereby reducing displacement and shaking during testing, ensuring the accuracy of test data, and allowing the clamping force to be evenly dispersed on the circumferential surface of the cable, thereby avoiding excessive local pressure that damages the cable sheath, and being able to fit the cable in all directions, adapting to cables of different shapes and thicknesses, and enhancing the clamping effect.

[0017] In the present invention, by adopting a worm gear transmission structure and utilizing its larger transmission ratio, an operator can obtain a larger torque output by applying a smaller force to turn the knob, thereby easily driving the clamping component, and the operation process is labor-saving and convenient.

[0018] In the present invention, the self-locking characteristics of the worm gear transmission can prevent the rotating piece from reversing after the knob stops turning, thereby preventing the clamping plate from loosening and the cable from accidentally falling off, providing reliable and safe protection for cable performance testing and ensuring that the testing work is stable and continuous. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of a cable performance measurement device; Figure 2 for Figure 1 The enlarged view of point A in the middle; Figure 3 A schematic diagram of the structure of a clamping table for a cable performance measurement device; Figure 4 A schematic diagram of a limit structure of a cable performance measurement device; Figure 5 A schematic diagram of a driving structure of a cable performance measurement device; Figure 6 The figure is a schematic diagram of a clamping plate structure of a cable performance measuring device.

[0020] In the figure: 1. test equipment; 2. motor; 201. mobile platform; 202. fixed platform; 3. clamping platform; 301. rotating plate; 302. radial groove; 303. tangential groove; 304. driving hole; 305. driving column; 306. worm gear; 307. rotating rod; 308. worm; 309. knob; 4. splint; 401. slider; 402. slide plate; 403. air hole; 404. pressure plate; 405. air bag; 406. connecting pipe; 407. spring; 5. connecting shaft; 501. tangential block; 502. radial block. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See also Figure 1-6 , the present invention provides a technical solution: A cable performance measuring device comprises a test device 1, a motor 2 and a clamping platform 3. The motor 2 is arranged on the top surface of the test device 1, and the output shaft of the motor 2 is connected with a screw rod. A straight slot is opened in the test device 1, and a straight slot block is slidably connected in the straight slot, and the straight slot block is threadedly connected with the screw rod. A mobile platform 201 is arranged on the straight slot block, and a fixed platform 202 is arranged on the top surface of the test device 1. Two clamping platforms 3 are respectively installed on the mobile platform 201 and the fixed platform 202.

[0023] Start the motor 2, and the output shaft of the motor 2 drives the screw to rotate. Since the straight slot block is threadedly connected to the screw and slides in the straight slot of the test device 1, the straight slot block moves linearly along the straight slot, thereby driving the mobile platform 201 installed on the straight slot block to move. The fixed platform 202 is fixed on the top surface of the test device 1, and the two clamping platforms 3 are respectively located on the mobile platform 201 and the fixed platform 202, so as to achieve relative proximity or distance between the two clamping platforms 3, which is convenient for clamping and positioning cables of different lengths.

[0024] A rotating piece 301 is rotatably connected to the clamping table 3, a radial groove 302 is opened on the top surface of the clamping table 3, a tangential groove 303 is opened on the top surface of the rotating piece 301, the number of radial grooves 302 and tangential grooves 303 are adapted and the positions are staggered, and the clamping plate 4 is slidably connected at the intersection of the radial groove 302 and the tangential groove 303.

[0025] The tangential grooves 303 on the top surface of the rotating piece 301 match the radial grooves 302 on the top surface of the clamping platform 3 in number and their positions are staggered. The clamping plate 4 is placed at the staggered position of the two and can slide in this area.

[0026] As the rotating piece 301 rotates, the relative positions of the tangential groove 303 and the radial groove 302 change. Due to the restriction and guidance of the groove, the clamping plate 4 will simultaneously displace radially and tangentially, moving toward the center position of the cable from multiple directions, and finally achieving an embracing clamping of the cable.

[0027] For example, when the rotating piece 301 rotates clockwise at a certain angle, the edge of the tangential groove 303 will "push" the clamping plate 4 to slide inward in the radial groove 302. At the same time, the edge of the radial groove 302 also assists the clamping plate 4 to be accurately positioned in the direction of the tangential groove 303. The multi-directional constraints make the clamping more stable.

[0028] Different from the traditional single-direction clamping method, this design of clamping the clamping plate 4 with radial and tangential staggered grooves can allow the clamping plate 4 to be close to the cable from multiple dimensions, so that the cable is fixed more firmly.

[0029] Whether it is axial tensile force or radial torsional force, it can effectively resist it, reduce the displacement and shaking of the cable during the test, and ensure the accuracy of the test data.

[0030] The multi-directional grooves cooperate to guide the action of the clamping plate 4, which means that the clamping force will not be concentrated on a certain point or a certain line, but will be evenly dispersed on the circumferential surface of the cable.

[0031] This can not only avoid excessive local pressure that damages the cable sheath, but also fit the cable in all directions, enhance the clamping effect, and adapt to cables of different shapes and thicknesses.

[0032] A connecting shaft 5 is arranged between the rotating piece 301 and the radial groove 302, and the two ends of the connecting shaft 5 are respectively connected to a tangential block 501 and a radial block 502, the tangential block 501 is slidably connected in the radial groove 302, the radial block 502 is slidably connected in the tangential groove 303, and the top surface of the radial block 502 is fixedly connected to the bottom surface of the clamping plate 4.

[0033] When the rotating piece 301 is rotated by force, the connecting shaft 5 connected thereto will rotate together.

[0034] A tangential block 501 and a radial block 502 are respectively provided at both ends of the connecting shaft 5 . The tangential block 501 slides along the radial groove 302 , and the radial block 502 slides along the tangential groove 303 .

[0035] Due to the rotation of the rotating piece 301 , the tangential block 501 will make an arc motion in the radial groove 302 , and the radial block 502 will make a corresponding displacement in the tangential groove 303 .

[0036] This motion mode accurately converts the rotational motion of the rotating plate 301 into a radial and tangential compound motion.

[0037] The top surface of the radial block 502 is fixedly connected to the bottom surface of the clamping plate 4 , so the displacement of the radial block 502 will directly drive the clamping plate 4 to move.

[0038] When the tangential block 501 moves in the radial groove 302 and the radial block 502 moves in the tangential groove 303 , the clamping plate 4 will slide accurately toward the cable according to a predetermined trajectory at the intersection of the radial groove 302 and the tangential groove 303 to clamp the cable.

[0039] For example, when the rotating piece 301 rotates clockwise, the tangential block 501 will slide along the radial groove 302 toward the center of the cable, pulling the connecting shaft 5, and the radial block 502 will slide in the corresponding direction in the tangential groove 303, finally tightening the clamping plate 4.

[0040] The connecting shaft 5 and the tangential blocks 501 and radial blocks 502 at both ends of the connecting shaft 5 constitute a sophisticated transmission structure, which can accurately decompose and transmit the rotational movement of the rotating plate 301 into the radial and tangential movements required by the clamping plate 4, thereby ensuring the accuracy of each clamping action, so that the cable can be stably and accurately fixed in the center position of the clamping table, which helps to improve the accuracy of subsequent tests.

[0041] This structure closely links the rotating piece 301, the groove and the clamping plate 4, and the various components restrict each other and work in coordination.

[0042] The sliding fit of the tangential block 501 in the radial groove 302 and the sliding fit of the radial block 502 in the tangential groove 303 enhances the stability of the entire clamping system, avoids abnormal situations such as shaking and jamming during the clamping process, and makes the clamping process smooth and stable.

[0043] A driving hole 304 is provided on the clamping platform 3, and a driving column 305 is connected to the bottom surface of the rotating plate 301, and a worm gear 306 is provided on the driving column 305. A rotating rod 307 is inserted in the clamping platform 3, and one end of the rotating rod 307 located on the inner side of the clamping platform 3 is fixedly connected to a worm 308, and the worm 308 is meshed with the worm gear 306. The other end of the rotating rod 307 is arranged on the outer side of the clamping platform 3, and a knob 309 is provided on the other end of the rotating rod 307.

[0044] When the operator needs to clamp or loosen the cable, the operator manually turns the knob 309 located outside the clamping platform 3 .

[0045] The knob 309 is connected to the rotating rod 307 , and the rotating rod 307 rotates accordingly. Since one end of the rotating rod 307 located on the inner side of the clamping platform 3 is fixedly connected to the worm 308 , the worm 308 also rotates synchronously.

[0046] The worm 308 is meshed with a worm wheel 306 disposed on the driving column 305 . According to the transmission principle of the worm wheel 306 and the worm 308 , the rotation of the worm 308 drives the worm wheel 306 to rotate.

[0047] The driving column 305 is connected to the bottom surface of the rotating plate 301 , thereby driving the rotating plate 301 to rotate around the connection point between the rotating plate 3 and the clamping platform 3 .

[0048] The rotation of the rotating piece 301 will further trigger a series of linkage components, such as the connecting shaft 5, the tangential block 501, the radial block 502 and the clamping plate 4 (the synergistic relationship between them has been mentioned above), and finally realize the clamping or loosening operation of the clamping plate 4 on the cable.

[0049] In short, the manual action of rotating the knob 309 is transformed into the rotation of the rotating plate 301 through the transmission of the worm gear 306 and the worm 308, and then progressively transformed into the radial and tangential composite movement of the clamping plate 4 to achieve the purpose of cable clamping.

[0050] The worm gear 306 and worm 308 transmission structure is adopted. The worm gear 306 and worm 308 have a large transmission ratio, so that the operator only needs to apply a small force to turn the knob 309 to obtain a large torque output, easily drive the rotating plate 301 and the subsequent clamping components to achieve the effect of clamping the cable, and the operation process is labor-saving and convenient.

[0051] At the same time, the transmission characteristics of the worm wheel 306 and the worm 308 determine that its transmission accuracy is relatively high, and it can accurately control the rotation angle of the rotating piece 301, and then accurately adjust the clamping degree of the clamping plate 4 to meet the clamping requirements of cables of different thicknesses and materials.

[0052] The transmission of the worm wheel 306 and the worm screw 308 has a self-locking feature. When the knob 309 stops turning, the worm screw 308 can automatically lock the worm wheel 306 to prevent the rotating piece 301 from reversing due to external vibrations, accidental touches, etc., thereby preventing the clamping plate 4 from loosening and the cable from accidentally falling off, providing reliable safety protection for the cable performance test process and ensuring that the test work can be carried out stably and continuously.

[0053] A slider 401 is slidably connected to the clamping plate 4. One end of the slider 401 is fixedly connected to a slide plate 402. The slide plate 402 is hollow and has air holes 403 formed thereon.

[0054] The other end of the slider 401 is fixedly connected with a pressing plate 404 , which is fixedly connected with the airbag 405 . A punching hole that coincides with the position of the airbag 405 is formed on the clamping plate 4 .

[0055] The portion where the airbag 405 overlaps with the punching hole is connected with a connecting tube 406 , and the other end of the connecting tube 406 is communicated with the slide plate 402 . A spring 407 is provided between the slide plate 402 and the clamping plate 4 , and the spring 407 is coaxial with the punching hole.

[0056] The airbag 405 has four clamping plates, which are distributed at the four corners between the clamping plate 4 and the pressure plate 404 .

[0057] When the cable clamping operation starts, the clamping plate 4 moves toward the cable and gradually contacts and clamps the cable.

[0058] During this process, the pressing plate 404 is subject to resistance from the cable. Since the pressing plate 404 is fixedly connected to the slider 401 , the slider 401 will slide inside the clamping plate 4 in a direction away from the cable.

[0059] The slider 401 drives the slide plate 402 connected thereto to move together, so that the spring 407 between the slide plate 402 and the clamping plate 4 is compressed; at the same time, the airbag 405 connected to the pressure plate 404 is stretched, the internal volume of the airbag 405 increases, and the air pressure decreases.

[0060] The airbag 405 is connected to the slide plate 402 via a connecting tube 406 . When the air pressure in the airbag 405 decreases, the air pressure inside the hollow slide plate 402 with air holes 403 will also decrease, thereby generating negative pressure at the air holes 403 .

[0061] Due to the air pressure difference between the cable surface and the air hole 403, the external air pressure will "press" the cable tightly against the clamping plate 4, and cooperate with the original mechanical clamping force of the clamping plate 4 to make the cable clamped more stably, transitioning from simple mechanical clamping to dual stable clamping of mechanical and air pressure adsorption.

[0062] When the cable needs to be released, the clamping force applied to the clamping plate 4 disappears, and the spring 407 releases the elastic potential energy stored previously, pushing the slide plate 402 to move to the initial position.

[0063] The slide plate 402 drives the slider 401 and the pressure plate 404 to return to their original positions, and the airbag 405 also contracts accordingly, and all components return to their initial states, ready for the next clamping.

[0064] The negative pressure adsorption generated by stretching the airbag 405 provides an additional stabilizing force for cable clamping. Compared with clamping simply relying on mechanical structure, this negative pressure adsorption can better fit the irregular surface of the cable, fill tiny gaps, and effectively reduce the shaking and displacement of the cable during the test, thereby greatly improving the accuracy of subsequent cable performance tests.

[0065] The shapes and surface roughness of different cables vary greatly. By utilizing the principle of negative pressure adsorption, both communication cables with smooth surfaces and power cables with slightly undulating surfaces can be clamped more tightly and stably, broadening the adaptability of the clamping device to different types of cables.

[0066] The combination of mechanical clamping force and negative pressure adsorption force avoids the risk of damaging the cable sheath by relying solely on high-strength mechanical clamping.

[0067] The buffering effect of the spring 407 and the flexible stretching of the airbag 405 make the entire clamping process more "gentle", extend the service life of the cable, and reduce the cable loss caused by clamping.

[0068] The connecting tube 406 is a spring tube. The connecting tube 406 adopts a spring tube structure, which can ensure gas circulation and adapt to certain deformation.

[0069] The slide plate 402 is a toothed plate, and the air holes 403 are provided on the toothed wall of the slide plate 402 .

[0070] When the cable is placed in the clamp, as the clamping plate 4 starts the clamping action, the slide plate 402 linked with the clamping plate 4 approaches the cable.

[0071] Since the slide plate 402 is a toothed plate, with its unique wavy or multi-toothed structure, when the cable contacts, the cable will be embedded between the tooth peaks and the tooth valleys.

[0072] Unlike traditional single-tooth or double-tooth clamps, the multi-tooth surface structure greatly increases the number of contact points with the cable surface.

[0073] As the clamping force is applied, these contact points are stressed simultaneously, allowing the cable to be firmly "stuck" instead of being supported by just a few points.

[0074] Numerous contact points are evenly distributed on the circumferential surface of the cable, which greatly increases the positive pressure between the cable and the tooth wall.

[0075] According to the friction calculation formula, friction is equal to the friction coefficient multiplied by the normal pressure. As the normal pressure increases, the friction will also increase while the friction coefficient remains unchanged.

[0076] When subsequent operations related to the cable are performed, such as stretching and torsion testing, the larger friction force can effectively prevent the cable from sliding relative to the slide plate 402, thereby ensuring that the test action is carried out stably.

[0077] The multi-point force characteristics brought by the multi-tooth surface structure significantly improve the friction between the cable and the clamp. Compared with traditional clamps, it can more effectively prevent the cable from slipping during testing.

[0078] This is crucial for high-precision and high-demand cable performance testing. Once slippage occurs, the test data will be greatly deviated. This solution can ensure the accuracy and reliability of the test data.

[0079] Different cables have different diameters, materials, and surface textures. This multi-tooth design can adaptively fit various cables.

[0080] Whether it is a thinner delicate cable or a thicker industrial cable, a suitable embedding method can be found and embedded between the tooth peaks and tooth valleys to achieve stable clamping, which broadens the scope of application of the clamp.

Claims

1. A cable performance measuring device, comprising a test device (1), a motor (2), and a clamping table (3), characterized in that: A clamping plate (4) is radially slidably arranged on the clamping platform (3); the front side of the clamping plate (4) is connected to a slide plate (402) via an elastic member; the slide plate (402) is hollow and has air holes (403) thereon; an air bag (405) is arranged on the back side of the clamping plate (4); the air bag (405) is connected to the interior of the slide plate (402); and the distance between the other end of the air bag (405) and the slide plate (402) is fixed.

2. A cable performance measuring device according to claim 1, characterized in that: A slider (401) is slidably connected to the clamping plate (4), one end of the slider (401) is fixedly connected to the sliding plate (402), the other end of the slider (401) is fixedly connected to a pressing plate (404), and the pressing plate (404) is fixedly connected to the airbag (405).

3. A cable performance measuring device as claimed in claim 2, characterized in that: The clamping plate (4) is provided with a punching hole that coincides with the position of the airbag (405); the portion of the airbag (405) that coincides with the punching hole is connected to a connecting tube (406); the other end of the connecting tube (406) is connected to the slide plate (402); the connecting tube (406) is a spring tube; a spring (407) is provided between the slide plate (402) and the clamping plate (4); the spring (407) is coaxial with the punching hole.

4. A cable performance measuring device as claimed in claim 3, characterized in that: The air bag (405) has four clamping plates (4) distributed at four corners between the clamping plates (4) and the pressure plate (404).

5. A cable performance measuring device as claimed in claim 4, characterized in that: The slide plate (402) is a toothed plate, and the air holes (403) are provided on the toothed wall of the slide plate (402).

6. A cable performance measuring device as claimed in claim 5, characterized in that: A rotating plate (301) is rotatably connected to the clamping platform (3), a radial groove (302) is provided on the top surface of the clamping platform (3), a tangential groove (303) is provided on the top surface of the rotating plate (301), the radial grooves (302) and the tangential grooves (303) are matched in number and staggered in position, and the clamping plate (4) is slidably connected at the intersection of the radial grooves (302) and the tangential grooves (303).

7. A cable performance measuring device as claimed in claim 6, characterized in that: The clamping platform (3) is provided with a driving hole (304); the bottom surface of the rotating plate (301) is connected to a driving column (305); a worm wheel (306) is provided on the driving column (305); a rotating rod (307) is inserted into the clamping platform (3); one end of the rotating rod (307) located on the inner side of the clamping platform (3) is fixedly connected to a worm (308); the worm (308) is meshed with the worm wheel (306); the other end of the rotating rod (307) is arranged on the outer side of the clamping platform (3); and a knob (309) is provided on the other end of the rotating rod (307).

8. A cable performance measuring device as claimed in claim 7, characterized in that: A connecting shaft (5) is provided between the rotating plate (301) and the radial groove (302), and two ends of the connecting shaft (5) are respectively connected to a tangential block (501) and a radial block (502), the tangential block (501) is slidably connected in the radial groove (302), the radial block (502) is slidably connected in the tangential groove (303), and the top surface of the radial block (502) is fixedly connected to the bottom surface of the clamping plate (4).

9. A cable performance measuring device as claimed in claim 8, characterized in that: The top surface of the test device (1) is provided with a motor (2), the output shaft of the motor (2) is connected to a screw, a straight slot is provided in the test device (1), a straight slot block is slidably connected in the straight slot, the straight slot block is threadedly connected to the screw, a mobile platform (201) is provided on the straight slot block, the top surface of the test device (1) is provided with a fixed platform (202), and the clamping platform (3) has two respectively mounted on the mobile platforms (201).

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