Pipa string life fatigue testing device and testing method thereof

Abstract

The invention discloses a pipa string life fatigue testing device and a testing method thereof.The left side of the top of a testing table is evenly and fixedly provided with a plurality of bosses from front to back, the top of each boss is fixedly provided with a tension meter, and the right side of each tension meter is fixedly provided with a hook ring; the hook ring is used for connecting one end of a lute string. The invention relates to the technical field of fatigue testing of the lute string. According to the pipa string service life fatigue testing device and the testing method thereof, through cooperation of the string pressing testing mechanism, the string plucking testing mechanism, the servo motor and the driving rod mechanism, the string pressing testing mechanism can be controlled to reciprocate up and down and the string plucking testing mechanism can be controlled to reciprocate front and back only under driving of one motor; the fatigue life testing device simulates the action of repeatedly pressing and shifting the lute string when playing the lute, namely, simulates the actual working condition of the lute string, not only can more truly test the fatigue life of the lute string, but also simplifies the equipment structure and saves the equipment cost.

Description

Technical Field

[0001] The invention relates to the technical field of pipa string fatigue testing, in particular to a pipa string life fatigue testing device and a testing method thereof. Background Art

[0002] Pipa is a traditional Chinese plucked string instrument with a long history and profound cultural heritage. As an important component of the pipa, the quality and life of the pipa strings have an important impact on the performance and service life of the pipa. In order to evaluate the quality and life of the pipa strings, a special testing device is needed to conduct life fatigue tests on the pipa strings, providing a scientific basis for the manufacture and selection of the pipa strings. At the same time, this testing device can also be used to study and improve the manufacturing process and material selection of the pipa strings, and improve the overall performance of the pipa.

[0003] The wiring harness fatigue testing device disclosed in the patent application with reference publication number CN205506588U can perform fatigue testing on several wiring harnesses at the same time, and can perform a single test or multiple continuous tests. The frequency and amplitude of the wiring harness bending can be adjusted. The test process is prompted by voice and relevant data information is displayed in real time. The accumulated time and the accumulated number of dynamic bending can be permanently saved, and the testing requirements of complete unattended operation can be met, thereby improving the monitoring efficiency and effectiveness, and having the characteristics of good practicality, high testing efficiency, high testing consistency and high testing accuracy.

[0004] Comprehensive analysis of the above reference patents shows the following defects: The existing pipa string life fatigue test device and test method, when faced with the test requirements of multiple pipa strings, find it difficult to use a simple mechanical structure to simultaneously simulate the pressing and plucking actions of multiple pipa strings, which makes the test complicated and increases the equipment manufacturing cost. In addition, the plucking pieces of the plucking mechanism in the device are prone to wear due to frequent use, and it is inconvenient to replace the worn plucking pieces, which affects the test efficiency. Therefore, it is necessary to provide a pipa string life fatigue test device and test method to solve the above technical problems. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a pipa string life fatigue testing device and a testing method thereof, which solves the problem that when facing the test needs of multiple pipa strings, it is difficult to use a simple mechanical structure to simultaneously simulate the pressing and plucking actions of multiple pipa strings, which makes the test complicated and increases the equipment manufacturing cost. In addition, the plectrum of the plucking mechanism in the device is prone to wear due to frequent use, and it is inconvenient to replace the worn plectrum, which affects the test efficiency.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a pipa string life fatigue test device, comprising: A test bench is placed on the ground, a plurality of bosses are evenly fixedly provided on the left side of the top of the test bench from front to back, a dynamometer is fixedly provided on the top of each boss, a hook ring is fixedly provided on the right side of each dynamometer, and the hook ring is used to connect one end of a pipa string, a first side panel is fixedly provided at the front and rear ends of the left side of the top of the test bench, a slide groove is provided on the side where two first side panels are close to each other, a second side panel is fixedly provided at the front and rear ends of the right side of the top of the test bench, a connecting plate is fixedly provided between the upper right parts of the two second side panels, a third side panel is fixedly provided in the middle of the left side of the top of the test bench, a servo motor is fixedly provided on the upper left part of the third side panel, a plurality of adjustment slots are evenly provided on the right side of the top of the test bench from front to back, a clamping mechanism is provided in each of the adjustment slots, and the clamping mechanism is used to clamp the other end of the pipa string and adjust the tension of the pipa string, a convex strip is fixedly provided in the middle of the top of the test bench, and a smart panel is fixedly provided at the front end of the test bench; A string pressing test mechanism, used to simulate repeatedly pressing down the pipa string when playing the pipa, the string pressing test mechanism being arranged between the two slide grooves; A string-plucking test mechanism, used for simulating repeatedly plucking the pipa strings when playing the pipa, wherein the string-plucking test mechanism is arranged between the two second side plates; The driving rod mechanism is used to drive the string pressing test mechanism to reciprocate up and down, and at the same time drive the string plucking test mechanism to reciprocate forward and backward. The output end of the servo motor passes through the right wall of the third side plate and is fixedly connected to the left end of the driving rod mechanism.

[0007] Preferably, the string pressure testing mechanism includes a first top plate, the front and rear ends of the first top plate are fixedly provided with first sliders, the two first sliders are respectively slidably connected in corresponding slide grooves, the bottom of the first slider is fixedly connected to the bottom of the slide groove by a first spring, and the bottom of the first top plate is evenly fixed with a plurality of vertical rods from front to back, and a pressure block is fixedly provided at the bottom of each vertical rod.

[0008] Preferably, the string-plucking testing mechanism includes a second top plate, the vertical cross-section of the second top plate is T-shaped, the front and rear ends of the second top plate are fixedly provided with square rods, the two square rods respectively slide through the corresponding second side plates, the ends of the two square rods away from each other are fixedly provided with blocks, the outer part of the rear square rod is sleeved with a second spring, the second spring is fixedly connected between the rear wall of the rear second side plate and the adjacent block, the bottom of the second top plate is evenly provided with a plurality of string-plucking assemblies from front to back, and a push block is fixedly provided in the middle of the top of the second top plate.

[0009] Preferably, each of the string-plucking assemblies includes a connecting frame, a rotating shaft is fixedly arranged between the upper left and right side walls of the connecting frame, the rotating shaft rotates and passes through the bottom of the second top plate, a torsion spring is arranged between the rotating shaft and the second top plate, and is used for the connecting frame to reset after flipping a fixed angle, the lower front and rear walls of the connecting frame are provided with triangular through grooves, and the lower inner cavity of the connecting frame is provided with a plectrum assembly, a triangular plug post passes through the two triangular through grooves and the interior of the plectrum assembly, a pull block is fixedly arranged on the rear end of the triangular plug post, a third spring is sleeved on the outside of the triangular plug post, and the third spring is fixedly connected between the rear wall of the connecting frame and the front wall of the pull block.

[0010] Preferably, the paddle assembly includes a rear chuck, and three square blocks are evenly fixedly arranged in a circle on the outer side of the front end of the rear chuck, a threaded column is fixedly arranged on the front end of each square block, a paddle is sleeved on the outside of each square block, and a front chuck is sleeved between the outsides of the three threaded columns.

[0011] Preferably, the front end of each threaded column is threadedly sleeved with an internal threaded cap, and a triangular frame is fixedly arranged in the middle of the side of the rear chuck and the front chuck that are away from each other, and the sides of the two triangular frames that are away from each other are in contact with the inner wall of the connecting frame, and the triangular plug column passes through the interior of the triangular frame, the rear chuck and the front chuck.

[0012] Preferably, the driving rod mechanism includes a long rod, the left end of the long rod is fixedly connected to the output end of the servo motor, the right end of the long rod is rotatably connected to the left side of the connecting plate, the left outer wall fixed sleeve of the long rod is provided with a cam, the cam is located directly above the first top plate, the side wall of the cam is evenly rotated with a number of anti-friction balls, the right outer wall fixed sleeve of the long rod is provided with a load-bearing wheel, the top of the load-bearing wheel is fixedly provided with a protrusion, and the protrusion pushes the push block during rotation.

[0013] Preferably, the clamping mechanism includes a T-block, which is slidably connected in the adjustment groove, a frame is fixedly provided on the top of the T-block, a vertical groove is opened at the rear end of the inner cavity of the frame, a lower clamping block is fixedly provided at the bottom of the inner cavity of the frame, and a threaded rod is passed through the top thread of the frame.

[0014] Preferably, an upper clamping block is rotatably provided at the bottom of the threaded rod, a limit block is fixedly provided at the rear end of the upper clamping block, the limit block is slidably connected in the vertical groove, and a screw rod is rotatably provided at the right end of the T-block, and the right end thread of the screw rod penetrates to the outside of the test bench.

[0015] The present invention also provides a pipa string life fatigue test method, using a pipa string life fatigue test device, the specific method comprises the following steps: Step 1, fasten one end of multiple pipa strings to be tested to each hook ring in turn, and then use each clamping mechanism in turn to clamp the other end of the corresponding pipa string, and then adjust the clamping mechanism to move the clamping mechanism in the left and right directions, and observe the reading of the dynamometer during the process until the initial tension of the pipa string is adjusted to the set value; Step 2, then start the servo motor to drive the driving rod mechanism to rotate, and during the rotation of the driving rod mechanism, drive the string pressing test mechanism to reciprocate up and down, and at the same time drive the string plucking test mechanism to reciprocate back and forth, and during the up and down reciprocating motion of the string pressing test mechanism, simulate the action of repeatedly pressing down the pipa strings when playing the pipa, and during the reciprocating motion of the string plucking test mechanism, simulate the action of repeatedly plucking the pipa strings when playing the pipa; Step 3. This compound action simulates the actual working condition of the pipa strings. Within a set time range, it observes the performance of the pipa strings under continuous force and vibration, conducts a real test of the fatigue life of the pipa strings, and thus evaluates the quality and durability of the pipa strings.

[0016] Beneficial Effects The present invention provides a pipa string life fatigue test device and a test method thereof. Compared with the prior art, it has the following beneficial effects: 1. A pipa string life fatigue test device and a test method thereof. Through the mutual cooperation between a string pressing test mechanism, a string plucking test mechanism, a servo motor and a driving rod mechanism, only under the drive of one motor, the string pressing test mechanism can be controlled to reciprocate up and down and the string plucking test mechanism can be controlled to reciprocate forward and backward, simulating the action of repeatedly pressing down and plucking the pipa strings when playing the pipa, that is, simulating the actual working conditions of the pipa strings, which can not only more realistically test the fatigue life of the pipa strings, but also simplify the equipment structure and save equipment costs.

[0017] 2. A pipa string life fatigue test device and test method thereof. Through the cooperation between a dynamometer, a hook ring, an adjustment slot, a T-block and a screw rod, the screw rod can be rotated to drive the T-block to move in the left and right directions. The position of the T-block can be fine-tuned as needed, that is, the right end of the pipa string is pulled to move. During the process, the reading on the dynamometer is observed, and the initial tension of the pipa string to be tested can be quickly and flexibly adjusted to meet different test requirements, with a wider range of applications.

[0018] 3. A pipa string life fatigue test device and a test method thereof. Through the cooperation between the first top plate, the first spring, the pressure block and the cam, and the cooperation between the second spring, the string-plucking assembly, the push block and the protrusion, the servo motor drives the long rod to rotate, which can drive the cam and the protrusion to rotate. During the rotation of the cam, several pressure blocks are pushed downward at the same time. In cooperation with the first spring, several pressure blocks can be reciprocated up and down at the same time, and multiple pipa strings are repeatedly pressed down at the same time. During the rotation of the protrusion, the push block is pushed forward. In cooperation with the second spring, several string-plucking assemblies can be reciprocated back and forth at the same time, and multiple pipa strings are repeatedly plucked at the same time. The operation is convenient and the test efficiency is greatly improved.

[0019] 4. A pipa string life fatigue test device and test method. Frequent use of plectrum will cause wear and tear. Continuing to use it will affect the life fatigue test effect of the pipa string. Through the cooperation between the plectrum assembly, the triangular plug post, the pull block and the third spring, the triangular plug post is pulled backward to release the lock of the plectrum assembly, so that the plectrum assembly can be quickly taken out, and the plectrum assembly is rotated to rotate the worn plectrum to the upper part, and the new plectrum can be rotated to the bottom at the same time. The triangular plug post is used to re-lock the plectrum assembly to achieve rapid switching between old and new plectrums. In addition, by setting up multiple groups of plectrums, the cycle of batch replacement of plectrums can be extended to improve test efficiency.

[0020] 5. A pipa string life fatigue test device and test method. Through the cooperation between the rear chuck, square block, threaded column, front chuck and internal threaded cap, after the pick assembly is taken out from the connecting frame, only the internal threaded cap needs to be screwed to release the lock between the rear chuck and the front chuck, and the three worn picks can be taken out from the corresponding square blocks respectively, and the worn picks can be replaced uniformly, saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A perspective view of the present invention; Figure 2 For the present invention Figure 1 A partial enlarged view of the middle A; Figure 3 It is a schematic diagram of the string pressing test mechanism, the string plucking test mechanism and the driving rod mechanism of the present invention in an assembled state; Figure 4 is an exploded view of the string-pressing test mechanism of the present invention; Figure 5 For the present invention Figure 1 A partial enlarged view of point B in the middle; Figure 6 is a stereoscopic diagram of the string-plucking testing mechanism of the present invention; Figure 7 is an exploded view of the string-plucking test mechanism of the present invention; Figure 8 For the present invention Figure 1 A partial enlarged view of point C in the middle; Fig. 9 is a three-dimensional diagram of the string-picking assembly of the present invention; Fig.10 is an exploded view of the string-picking assembly of the present invention; Fig.11 is an exploded view of the paddle assembly of the present invention; Fig.12 is a three-dimensional diagram of the rear chuck of the present invention; Fig.13 is a three-dimensional diagram of the clamping mechanism of the present invention; Fig.14 is an exploded view of the clamping mechanism of the present invention; Fig.15 It is a three-dimensional diagram of the cam of the present invention.

[0022] In the figure: 1, test bench; 2, boss; 3, dynamometer; 4, hook; 5, first side plate; 6, slide groove; 7, string pressing test mechanism; 71, first top plate; 72, first slide block; 73, first spring; 74, vertical rod; 75, pressure block; 8, second side plate; 9, string plucking test mechanism; 91, second top plate; 92, square rod; 93, stopper; 94, second spring; 95, string plucking assembly; 951, connecting frame; 952, rotating shaft; 953, torsion spring; 954, triangular through groove; 955, plectrum assembly; 9551, rear chuck; 9552, square block; 9553, threaded column; 9554, plectrum; 9555, front chuck; 9556, internal threaded cap; 9557, triangular frame; 956, triangular plug column; 957, pull block; 958, third spring; 96, push block; 10, connecting plate; 11, third side plate; 12, servo motor; 13, drive rod mechanism; 131, long rod; 132, cam; 133, anti-friction ball; 134, load-bearing wheel; 135, convex block; 14, adjustment groove; 15, clamping mechanism; 151, T-block; 152, frame; 153, vertical groove; 154, lower clamping block; 155, threaded rod; 156, upper clamping block; 157, limit block; 158, screw rod; 16, convex strip. DETAILED DESCRIPTION

[0023] 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.

[0024] The present invention provides two technical solutions: like Figure 1 and Figure 2 The first embodiment is shown: a pipa string life fatigue test device, comprising: The test bench 1 is placed on the ground. A plurality of bosses 2 are evenly fixedly arranged on the left side of the top of the test bench 1 from front to back. A dynamometer 3 is fixedly arranged on the top of each boss 2. A hook ring 4 is fixedly arranged on the right side of each dynamometer 3. The hook ring 4 is used to connect one end of the pipa string. A first side plate 5 is fixedly arranged on the front and rear ends of the left side of the top of the test bench 1. A slide groove 6 is provided on the side where the two first side plates 5 are close to each other. A second side plate 8 is fixedly arranged on the front and rear ends of the right side of the top of the test bench 1. The right sides of the two second side plates 8 A connecting plate 10 is fixedly arranged between the upper parts, a third side plate 11 is fixedly arranged in the middle of the left side of the top of the test bench 1, a servo motor 12 is fixedly arranged on the upper left part of the third side plate 11, a plurality of adjustment slots 14 are evenly arranged on the right side of the top of the test bench 1 from front to back, and a clamping mechanism 15 is arranged in each adjustment slot 14, and the clamping mechanism 15 is used to clamp the other end of the pipa string and adjust the tension of the pipa string, a convex strip 16 is fixedly arranged in the middle of the top of the test bench 1, and a smart panel is fixedly arranged at the front end of the test bench 1; The string pressing test mechanism 7 is used to simulate repeatedly pressing down the pipa string when playing the pipa, and the string pressing test mechanism 7 is arranged between the two slide grooves 6; The string-plucking test mechanism 9 is used to simulate repeatedly plucking the pipa strings when playing the pipa, and the string-plucking test mechanism 9 is arranged between the two second side plates 8; The driving rod mechanism 13 is used to drive the string pressing test mechanism 7 to reciprocate up and down, and at the same time drive the string plucking test mechanism 9 to reciprocate forward and backward. The output end of the servo motor 12 passes through the right wall of the third side plate 11 and is fixedly connected to the left end of the driving rod mechanism 13.

[0025] Through the mutual cooperation among the string-pressing test mechanism 7, the string-plucking test mechanism 9, the servo motor 12 and the driving rod mechanism 13, under the drive of only one motor, the string-pressing test mechanism 7 can be controlled to perform up and down reciprocating motion and the string-plucking test mechanism 9 can be controlled to perform forward and backward reciprocating motion, thereby simulating the action of repeatedly pressing down and plucking the pipa strings when playing the pipa, that is, simulating the actual working conditions of the pipa strings, which can not only test the fatigue life of the pipa strings more realistically, but also simplify the equipment structure and save equipment costs.

[0026] like Figures 3 to 15A second embodiment is shown, which mainly differs from the first embodiment in that: a pipa string life fatigue test device, a string pressing test mechanism 7 includes a first top plate 71, the front and rear ends of the first top plate 71 are fixedly provided with first sliders 72, the two first sliders 72 are respectively slidably connected in the corresponding slide grooves 6, the bottom of the first slider 72 is fixedly connected to the bottom of the slide groove 6 by a first spring 73, a plurality of vertical rods 74 are evenly fixedly provided on the bottom of the first top plate 71 from front to back, and a pressure block 75 is fixedly provided on the bottom of each vertical rod 74, and the string plucking test mechanism 9 includes a second top plate 91, the vertical section of the second top plate 91 is T-shaped, the front and rear ends of the second top plate 91 are fixedly provided with square rods 92, and the two square rods 92 respectively slide through the corresponding In the second side plate 8, a stopper 93 is fixedly provided at one end of the two square rods 92 away from each other, and a second spring 94 is sleeved on the outside of the rear square rod 92, and the second spring 94 is fixedly connected between the rear wall of the rear second side plate 8 and the adjacent stopper 93. A plurality of string-plucking assemblies 95 are evenly arranged from front to back at the bottom of the second top plate 91, and a push block 96 is fixedly arranged at the top middle of the second top plate 91. Each string-plucking assembly 95 includes a connecting frame 951, and a rotating shaft 952 is fixedly arranged between the upper left and right side walls of the connecting frame 951. The rotating shaft 952 rotates and passes through the bottom of the second top plate 91. A torsion spring 953 is arranged between the rotating shaft 952 and the second top plate 91, which is used for the connecting frame 951 to reset after flipping a fixed angle, and the front and rear walls of the lower part of the connecting frame 951 are A triangular through slot 954 is provided, and a paddle assembly 955 is provided in the lower inner cavity of the connecting frame 951. A triangular plug post 956 runs through the two triangular through slots 954 and the interior of the paddle assembly 955. A pull block 957 is fixedly provided at the rear end of the triangular plug post 956. A third spring 958 is sleeved on the outside of the triangular plug post 956. The third spring 958 is fixedly connected between the rear wall of the connecting frame 951 and the front wall of the pull block 957. The paddle assembly 955 includes a rear chuck 9551. Three square blocks 9552 are evenly fixedly provided on the outer side of the front end of the rear chuck 9551. A threaded column 9553 is fixedly provided on the front end of each square block 9552. A paddle 9554 is sleeved on the outside of each square block 9552. The outer sides of the three threaded columns 9553 are A front chuck 9555 is sleeved between the parts, and an internal threaded cap 9556 is threadedly sleeved on the front end of each threaded column 9553. A triangular frame 9557 is fixedly set in the middle of the side away from each other between the rear chuck 9551 and the front chuck 9555. The sides of the two triangular frames 9557 away from each other are in contact with the inner wall of the connecting frame 951. The triangular plug column 956 runs through the interior of the triangular frame 9557, the rear chuck 9551 and the front chuck 9555. The driving rod mechanism 13 includes a long rod 131. The left end of the long rod 131 is fixedly connected to the output end of the servo motor 12, and the right end of the long rod 131 is rotatably connected to the left side of the connecting plate 10. A cam 132 is fixedly sleeved on the outer wall of the left part of the long rod 131. The cam 132 is located just above the first top plate 71.The side wall of the cam 132 is evenly rotated with a plurality of anti-friction balls 133, the right outer wall of the long rod 131 is fixedly sleeved with a load wheel 134, the top of the load wheel 134 is fixedly provided with a protrusion 135, and the protrusion 135 pushes the push block 96 during the rotation process, and the clamping mechanism 15 includes a T-block 151, the T-block 151 is slidably connected in the adjustment groove 14, and the top of the T-block 151 is fixedly provided with a frame 152, and the rear end of the inner cavity of the frame 152 is opened There is a vertical slot 153, a lower clamp block 154 is fixedly arranged at the bottom of the inner cavity of the frame 152, a threaded rod 155 is threaded through the top of the frame 152, an upper clamp block 156 is rotatably arranged at the bottom of the threaded rod 155, a limit block 157 is fixedly arranged at the rear end of the upper clamp block 156, and the limit block 157 is slidably connected in the vertical slot 153, a screw rod 158 is rotatably arranged at the right end of the T-block 151, and the right end of the screw rod 158 is threaded through to the outside of the test bench 1.

[0027] By the mutual cooperation among the dynamometer 3, the hook ring 4, the adjustment slot 14, the T-block 151 and the screw rod 158, the screw rod 158 can be rotated to drive the T-block 151 to move in the left and right directions, and the position of the T-block 151 can be fine-tuned as needed, that is, the right end of the pipa string is pulled to move, and the reading on the dynamometer 3 is observed during the process, so that the initial tension of the pipa string to be tested can be quickly and flexibly adjusted to meet different test requirements, and the application range is wider. Through the cooperation between the first top plate 71, the first spring 73, the pressure block 75 and the cam 132, the second spring 94, the string-picking assembly 95, the push block 96 and the cam 132 are adjusted. The servo motor 12 drives the long rod 131 to rotate, which can drive the cam 132 and the protrusion 135 to rotate. During the rotation of the cam 132, the plurality of pressing blocks 75 are pushed downward at the same time, and cooperate with the first spring 73, so that the plurality of pressing blocks 75 can simultaneously perform up and down reciprocating motions, and multiple pipa strings are repeatedly pressed down at the same time. During the rotation of the protrusion 135, the push block 96 is pushed forward, and cooperates with the second spring 94, so that the plurality of string-plucking assemblies 95 can simultaneously perform back and forth reciprocating motions, and multiple pipa strings are repeatedly plucked at the same time. The operation is convenient, and the test efficiency is greatly improved. The plectrum 9554 may wear out if used frequently. Continuing to use it may affect the life of the pipa strings and the fatigue test results. Through the cooperation among the plectrum assembly 955, the triangular plug post 956, the pull block 957 and the third spring 958, the triangular plug post 956 is pulled backward to release the lock of the plectrum assembly 955, so that the plectrum assembly 955 can be quickly taken out. The plectrum assembly 955 is rotated to rotate the worn plectrum 9554 to the upper part, and the new plectrum 9554 can be rotated to the bottom. The triangular plug post 956 is used to re-lock the plectrum assembly 955, so that the new and old plectrums 9554 can be quickly switched. In addition, by providing multiple groups of paddles 9554, the cycle of batch replacement of paddles 9554 can be extended to improve testing efficiency. Through the cooperation between the rear chuck 9551, the square block 9552, the threaded column 9553, the front chuck 9555 and the internal threaded cap 9556, after the paddle assembly 955 is removed from the connecting frame 951, it is only necessary to screw the internal threaded cap 9556 to release the lock between the rear chuck 9551 and the front chuck 9555, so that the three worn paddles 9554 can be taken out from the corresponding square blocks 9552 respectively, and the worn paddles 9554 can be replaced uniformly, saving time and effort.

[0028] The embodiment of the present invention further provides a pipa string life fatigue test method, using a pipa string life fatigue test device, and the specific method includes the following steps: Step 1, fasten one end of a plurality of pipa strings to be tested to each hook ring 4 in sequence, and then use each clamping mechanism 15 in sequence to clamp the other end of the corresponding pipa string. During the process, first tighten the other end of the pipa string to make the other end of the pipa string pass through the lower clamping block 154 and the upper clamping block 156, then screw the threaded rod 155, push the upper clamping block 156 downward, cooperate with the lower clamping block 154, clamp the other end of the pipa string, then screw the screw rod 158 again, pull the T-block 151 to move in the left and right directions, fine-tune the position of the T-block 151 as needed, that is, pull the right end of the pipa string to move, observe the reading on the dynamometer 3 during the process, wherein the dynamometer 3 belongs to the prior art known to those skilled in the art, until the initial tension of the pipa string to be tested is accurately adjusted to the required value to meet the test requirements; Step 2, then start the servo motor 12, the servo motor 12 drives the long rod 131 to rotate, and then drives the cam 132 and the protrusion 135 to rotate. During the rotation of the cam 132, the plurality of pressing blocks 75 are pushed downward at the same time, and cooperate with the first spring 73 to make the plurality of pressing blocks 75 reciprocate up and down at the same time, and the plurality of pipa strings are repeatedly pressed down at the same time, simulating the action of repeatedly pressing down the pipa strings when playing the pipa. During the rotation of the protrusion 135, the push block 96 is pushed forward, and cooperates with the second spring 94 to make the plurality of string-plucking assemblies 95 reciprocate back and forth at the same time, and the bottom plectrum 9554 in these string-plucking assemblies 95 is used to repeatedly pluck the plurality of pipa strings at the same time, simulating the action of repeatedly plucking the pipa strings when playing the pipa; Step 3, this composite action simulates the actual working condition of the pipa string during the performance, which is constantly subjected to force and vibration. Within the set time range, the performance of the pipa string under this simulation is observed, and the fatigue life of the pipa string is truly tested, thereby evaluating the quality and durability of the pipa string. The pick 9554 will wear out due to frequent use, and the continued use of the worn pick 9554 will affect the life fatigue test effect of the pipa string. The triangular plug 956 is pulled back regularly to unlock the pick assembly 955, and the pick assembly 955 is quickly taken out, and the pick assembly 955 is rotated to remove the worn pick assembly. The paddle 9554 is rotated to the upper part, and the new paddle 9554 is rotated to the bottom at the same time. The triangular plug 956 is used to re-lock the paddle assembly 955 to achieve rapid switching between the old and new paddles 9554. After that, the test operation is continued and the worn paddles 9554 are replaced in batches regularly. During the process, the paddle assembly 9555 is first taken out from the connecting frame 951, and then the internal threaded cap 9556 is screwed to release the lock between the rear chuck 9551 and the front chuck 9555, and then the three worn paddles 9554 are taken out from the corresponding square blocks 9552 respectively, and the worn paddles 9554 are replaced uniformly.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pipa string life fatigue test device, characterized in that: include: A test bench is placed on the ground, a plurality of bosses are evenly fixedly provided on the left side of the top of the test bench from front to back, a dynamometer is fixedly provided on the top of each boss, a hook ring is fixedly provided on the right side of each dynamometer, and the hook ring is used to connect one end of a pipa string, a first side panel is fixedly provided at the front and rear ends of the left side of the top of the test bench, a slide groove is provided on the side where two first side panels are close to each other, a second side panel is fixedly provided at the front and rear ends of the right side of the top of the test bench, a connecting plate is fixedly provided between the upper right parts of the two second side panels, a third side panel is fixedly provided in the middle of the left side of the top of the test bench, a servo motor is fixedly provided on the upper left part of the third side panel, a plurality of adjustment slots are evenly provided on the right side of the top of the test bench from front to back, a clamping mechanism is provided in each of the adjustment slots, and the clamping mechanism is used to clamp the other end of the pipa string and adjust the tension of the pipa string, a convex strip is fixedly provided in the middle of the top of the test bench, and a smart panel is fixedly provided at the front end of the test bench; A string pressing test mechanism, used to simulate repeatedly pressing down the pipa string when playing the pipa, the string pressing test mechanism being arranged between the two slide grooves; A string-plucking test mechanism, used for simulating repeatedly plucking the pipa strings when playing the pipa, wherein the string-plucking test mechanism is arranged between the two second side plates; The driving rod mechanism is used to drive the string pressing test mechanism to reciprocate up and down, and at the same time drive the string plucking test mechanism to reciprocate forward and backward. The output end of the servo motor passes through the right wall of the third side plate and is fixedly connected to the left end of the driving rod mechanism.

2. A pipa string life fatigue testing device according to claim 1, characterized in that: The string pressure testing mechanism includes a first top plate, and the front and rear ends of the first top plate are fixedly provided with first sliders, and the two first sliders are respectively slidably connected in corresponding slide grooves, and the bottom of the first slider is fixedly connected to the bottom of the slide groove by a first spring, and the bottom of the first top plate is evenly fixed with a plurality of vertical rods from front to back, and a pressure block is fixedly provided at the bottom of each vertical rod.

3. A pipa string life fatigue testing device according to claim 2, characterized in that: The string-plucking testing mechanism includes a second top plate, the vertical section of the second top plate is T-shaped, the front and rear ends of the second top plate are fixedly provided with square rods, the two square rods slide through the corresponding second side plates respectively, the ends of the two square rods away from each other are fixedly provided with blocks, the outer part of the rear square rod is sleeved with a second spring, the second spring is fixedly connected between the rear wall of the rear second side plate and the adjacent block, the bottom of the second top plate is evenly provided with a plurality of string-plucking assemblies from front to back, and a push block is fixedly provided in the middle of the top of the second top plate.

4. A pipa string life fatigue testing device according to claim 3, characterized in that: Each of the string-plucking assemblies includes a connecting frame, a rotating shaft is fixedly arranged between the upper left and right side walls of the connecting frame, the rotating shaft rotates and passes through the bottom of the second top plate, a torsion spring is arranged between the rotating shaft and the second top plate, and is used for the connecting frame to reset after flipping a fixed angle, triangular through grooves are provided on the front and rear walls of the lower part of the connecting frame, a plectrum assembly is arranged in the lower inner cavity of the connecting frame, a triangular plug column passes through the inside of the two triangular through grooves and the plectrum assembly, a pull block is fixedly arranged on the rear end of the triangular plug column, a third spring is sleeved on the outside of the triangular plug column, and the third spring is fixedly connected between the rear wall of the connecting frame and the front wall of the pull block.

5. A pipa string life fatigue testing device according to claim 4, characterized in that: The paddle assembly includes a rear chuck, and three square blocks are evenly fixedly arranged in a circle on the outer side of the front end of the rear chuck, a threaded column is fixedly arranged on the front end of each square block, a paddle is sleeved on the outside of each square block, and a front chuck is sleeved between the outsides of the three threaded columns.

6. A pipa string life fatigue testing device according to claim 5, characterized in that: The front end of each threaded column is threadedly sleeved with an internal threaded cap, and a triangular frame is fixedly set in the middle of the side of the rear chuck and the front chuck that are away from each other, and the sides of the two triangular frames that are away from each other are in contact with the inner wall of the connecting frame, and the triangular plug column passes through the interior of the triangular frame, the rear chuck and the front chuck.

7. The pipa string life fatigue testing device according to claim 3, characterized in that: The driving rod mechanism includes a long rod, the left end of the long rod is fixedly connected to the output end of the servo motor, the right end of the long rod is rotatably connected to the left side of the connecting plate, a cam is provided on the fixed sleeve of the left outer wall of the long rod, the cam is located directly above the first top plate, a plurality of anti-friction balls are evenly rotated on the side wall of the cam, a load-bearing wheel is provided on the fixed sleeve of the right outer wall of the long rod, a protrusion is fixedly provided on the top of the load-bearing wheel, and the protrusion pushes the push block during rotation.

8. The pipa string life fatigue testing device according to claim 1, characterized in that: The clamping mechanism includes a T-block, which is slidably connected in the adjustment groove. A frame is fixedly arranged on the top of the T-block, a vertical groove is opened at the rear end of the inner cavity of the frame, a lower clamping block is fixedly arranged at the bottom of the inner cavity of the frame, and a threaded rod is penetrated through the top thread of the frame.

9. A pipa string life fatigue testing device according to claim 8, characterized in that: An upper clamping block is rotatably provided at the bottom of the threaded rod, a limit block is fixedly provided at the rear end of the upper clamping block, the limit block is slidably connected in the vertical groove, a screw rod is rotatably provided at the right end of the T-block, and the right end thread of the screw rod penetrates to the outside of the test bench.

10. A pipa string life fatigue test method, characterized in that: Using the pipa string life fatigue testing device as described in any one of claims 1 to 9, the method comprises the following steps: Step 1, fasten one end of multiple pipa strings to be tested to each hook ring in turn, and then use each clamping mechanism in turn to clamp the other end of the corresponding pipa string, and then adjust the clamping mechanism to move the clamping mechanism in the left and right directions, and observe the reading of the dynamometer during the process until the initial tension of the pipa string is adjusted to the set value; Step 2, then start the servo motor to drive the driving rod mechanism to rotate, and during the rotation of the driving rod mechanism, drive the string pressing test mechanism to reciprocate up and down, and at the same time drive the string plucking test mechanism to reciprocate back and forth, and during the up and down reciprocating motion of the string pressing test mechanism, simulate the action of repeatedly pressing down the pipa strings when playing the pipa, and during the reciprocating motion of the string plucking test mechanism, simulate the action of repeatedly plucking the pipa strings when playing the pipa; Step 3. This compound action simulates the actual working condition of the pipa strings. Within a set time range, it observes the performance of the pipa strings under continuous force and vibration, conducts a real test of the fatigue life of the pipa strings, and thus evaluates the quality and durability of the pipa strings.

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