Servo-driven full-automatic wire tension detection device

Abstract

The application belongs to the technical field of material mechanical property testing, and specifically discloses a servo driving type full-automatic wire tension detection device, which comprises integrally-formed connecting bench seat one and connecting bench seat two, the servo driving mechanism is arranged on the connecting bench seat one, and the tension tester is installed at the top end of the connecting bench seat two; the servo driving mechanism comprises a slidingly arranged sliding bench assembly and a servo motor for driving the sliding bench assembly; two claw clamp assemblies are rotatably connected with the sliding bench assembly and the tension tester; the two claw clamp assemblies are horizontally and staggeredly arranged; the sliding bench assembly and the claw clamp assembly on the upper portion of the sliding bench assembly are arranged in an up-down sliding mode, and a sensor is arranged between the sliding bench assembly and the claw clamp assembly; and a PLC controller is installed on the connecting bench seat two. The hinged claw clamp assembly is used for automatic centering, the lateral force interference is eliminated, the floating sliding bench is matched with the sensor to accurately capture the instantaneous displacement at the moment of fracture, the automatic measurement of elongation is realized, and the device has the characteristics of high testing precision, good consistency and convenient operation.

Description

Technical Field

[0001] This invention belongs to the field of material mechanical property testing technology, specifically a servo-driven fully automatic tensile testing device for wires. Background Technology

[0002] In the production and manufacturing of flexible wires such as wires and cables, metal wires, and carbon fiber bundles, the tensile strength test of the wires is a key link in quality control. At present, many small and medium-sized cable processing enterprises in the industry still use the manual breaking method for spot inspection: the operator holds both ends of the wire, applies force manually to break the wire, and uses a simple tensile tester to read the maximum force value at the moment of breakage.

[0003] However, this manual testing method has the following inherent defects: Firstly, the tensile speed cannot be standardized. Different operators have significant differences in the speed at which they apply force. It is also difficult for the same person to maintain a constant speed in different batches of tests. Moreover, most of the silk materials are viscoelastic, and their breaking strength is significantly sensitive to the tensile speed. Too fast a speed may lead to an overestimation of the measured value, while too slow a speed may lead to an underestimation of the value. This makes the test data between different batches incomparable.

[0004] Secondly, the angle of force application cannot be guaranteed to be consistent. When pulling manually, the direction of force on the thread changes with the operator's hand posture, making it difficult to ensure that each stretch is along the axial direction of the thread. When there is an angle between the direction of force application and the axial direction of the thread, the thread will be subject to interference from lateral bending moment and shear stress in addition to axial tension. This will not only cause the test value to deviate from the true tensile strength, but also easily cause abnormal stress concentration at the clamping point, causing the thread to break prematurely at the clamping point and generating invalid test data.

[0005] To address the aforementioned issues, some high-end laboratories have adopted imported universal testing machines as alternatives. However, such equipment is complex in structure and expensive, making it unsuitable for large-scale deployment on production sites. In recent years, some manufacturers have attempted to develop simple tensile testing devices based on cylinders or ordinary motors. However, these solutions still have many shortcomings: the speed and stroke of cylinder drives are difficult to control precisely, and ordinary motor drives lack accurate displacement feedback, making it impossible to simultaneously acquire information on the elongation of the wire. More importantly, most existing automated tensile testing devices follow the rigid connection structure of traditional testing machines. The impact load generated at the moment the wire breaks is directly transmitted to the tensile sensor and transmission mechanism. Long-term use can easily lead to zero-point drift of the sensor and fatigue damage to mechanical components. In addition, the rigid connection structure places extremely stringent requirements on the machining accuracy and assembly coaxiality of the parts. Any installation deviation will generate additional bending moment during the tensile process, affecting the testing accuracy. Summary of the Invention

[0006] The purpose of this invention is to provide a servo-driven fully automatic tension testing device for yarns to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a servo-driven fully automatic tension testing device for silk threads, comprising an integrally formed connecting platform seat one and a connecting platform seat two. A servo drive mechanism is provided on the connecting platform seat one, and a tensioner is installed at the top of the connecting platform seat two. The servo drive mechanism includes a slide assembly slidably disposed on the connecting platform seat one and a servo motor driving the slide assembly. A jaw clamp assembly is respectively disposed between the slide assembly and the tensioner. The two jaw clamp assemblies are rotatably connected to the slide assembly and the tensioner, respectively. The two jaw clamp assemblies are arranged horizontally and staggered. The slide assembly and the upper jaw clamp assembly are slidably disposed vertically. A sensor is disposed between the slide assembly and the upper jaw clamp assembly. A PLC controller is installed at one end of the connecting platform seat two.

[0008] Preferably, the slide assembly includes a lead screw and a plurality of guide rail grooves, the plurality of guide rail grooves being symmetrically opened at the top of the connecting platform, the lead screw being installed on the inner side of the connecting platform, a slide block being slidably installed between the plurality of guide rail grooves, a fixed arm being fixedly installed at the bottom end of the slide block, and a nut sleeve threadedly connected to the lead screw being installed on the inner side of the fixed arm.

[0009] Preferably, a connecting frame is slidably disposed on the upper side of the slide block, and the sensor includes sensor one and sensor two, which are symmetrically mounted on the opposite surfaces of the slide block and the connecting frame.

[0010] Preferably, a plurality of slide rods are slidably mounted on the upper side of the slide block, and all of the slide rods are fixed to the bottom end of the connecting frame.

[0011] Preferably, a stop plate is installed at the bottom end of each of the slide rods, a compound spring is sleeved on the outer surface of each of the slide rods, and the two ends of the compound springs abut against the opposite surfaces of the slide block and the stop plate.

[0012] Preferably, the claw assembly includes a clamping seat, the clamping seat is L-shaped, a handle screw is threaded through one end of the clamping seat in the vertical direction, a fixed clamping block is installed at the top of the clamping seat in the horizontal direction, and a movable clamping block is rotatably installed on one end of the handle screw near the fixed clamping block.

[0013] Preferably, a hinge frame is rotatably mounted on one side of the clamp in the horizontal direction, and the clamp is hingedly connected to the tensioner or the connecting frame through the hinge frame.

[0014] Preferably, the fixed clamping block has an abutment groove on the side away from the moving clamping block.

[0015] Preferably, the moving clamping block and the fixed clamping block have a common engagement groove between their opposing surfaces.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. This invention incorporates hinged connections between the two gripper assemblies and their corresponding mounting bases (i.e., the tensioner and slide assembly). This allows the gripper assemblies to adaptively deflect slightly around the hinge points after clamping the wire, until the line connecting the two gripping points automatically adjusts to be perfectly parallel to the sliding direction of the slide assembly. This automatic alignment mechanism offers multiple benefits: First, it significantly reduces the requirements for component machining accuracy and assembly coaxiality, enabling high-precision stretching without expensive precision calibration procedures. Second, even after long-term use, if the guide rail experiences slight wear or the frame undergoes minor deformation, the hinged structure can still compensate for angular deviations, extending the equipment's lifespan and maintenance cycle. More importantly, because the hinged structure only transmits axial tension and not bending moment, it completely eliminates additional lateral forces caused by installation deviations or wire bending, ensuring that the data collected by the tensioner accurately reflects the wire's true tensile strength. This fundamentally solves the core problem of inconsistent force application angles in manual testing.

[0018] 2. This invention achieves effective absorption of the impact energy at the moment of wire breakage and precise locking of the breakage location by setting the connecting frame of the bearing claw assembly and the slide to slide vertically, and installing a sensor group consisting of two sensors between them, in conjunction with the floating buffer structure composed of the slide rod and the compound spring. When the wire breaks during the stretching process, the external axial load instantly returns to zero. At this time, the connecting frame generates a slight vertical displacement relative to the slide under the elastic restoring force of the compound spring. This displacement is instantly captured by the sensor group consisting of sensor one and sensor two and fed back to the PLC controller. On the one hand, the floating buffer absorbs the kinetic energy of the breakage impact, avoiding fatigue damage to the strain gauges and lead screw bearings inside the tensioner caused by rigid transmission; on the other hand, since the displacement change of the connecting frame at the moment of breakage is accurately recorded, the PLC controller can synchronously read the pulse value of the servo motor encoder at that moment, thereby deducing the precise elongation at the moment the wire breaks, realizing automatic measurement of the breakage elongation without additional sensors.

[0019] 3. This invention employs a servo motor in conjunction with a lead screw-nut transmission pair to drive a slide assembly for linear tensioning. It utilizes the inherent frictional damping characteristics of the lead screw and nut pair coupled with the electromagnetic damping characteristics of the servo motor system to create a dynamic resistance balance at the instant the wire breaks and the external load disappears. This allows the slide assembly to overcome inertial impact and remain stationary at the break point. This characteristic offers dual benefits: firstly, it eliminates the need for additional hydraulic buffers or mechanical anti-collision blocks, effectively protecting the slide's travel limits, simplifying the equipment structure and reducing manufacturing costs; secondly, the slide assembly exhibits no reverse rebound or forward overshoot at the moment of breakage, ensuring that the displacement data recorded by the servo motor encoder accurately reflects the wire's maximum elongation at the actual break point. This eliminates the displacement reading misalignment problem caused by inertial sliding of the slide in traditional solutions, improving the reliability of elongation measurement data.

[0020] 4. This invention improves the reliability of clamping by setting a meshing groove on the opposing surfaces of the fixed clamping block and the moving clamping block of the claw clamp assembly, and opening a stop groove on the side of the fixed clamping block away from the moving clamping block. The meshing groove increases the friction between the clamping surface and the wire, effectively preventing the wire from slipping during the stretching process. The stop groove limits the clamping position of the wire, ensuring that the clamping length of the wire is consistent in each test, further ensuring the repeatability of the test results. At the same time, the method of using the handle screw to drive the moving clamping block for feeding is simple in structure and intuitive in operation, making it easy for operators to quickly complete the clamping and unclamping of the wire. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall side elevation structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the side elevation structure of the entire invention on the other side;

[0023] Figure 3 This is a schematic cross-sectional view of the connecting platform and the slide assembly in this invention.

[0024] Figure 4 This is a schematic diagram of the connection structure between the slide assembly and the gripper assembly in this invention;

[0025] Figure 5 This is a schematic diagram of the disassembled structure of the slide and the connecting frame in this invention;

[0026] Figure 6 For the present invention Figure 5 A magnified schematic diagram of the node structure at point A in the middle;

[0027] Figure 7 This is a schematic diagram of the side elevation connection structure of the claw clamp assembly in this invention.

[0028] In the diagram: 1. Connecting platform seat one; 2. Connecting platform seat two; 3. Tensioner; 4. PLC controller; 5. Servo drive mechanism; 51. Servo motor; 52. Slide assembly; 53. Lead screw; 54. Guide rail groove; 55. Slide seat; 56. Fixed arm; 561. Lead screw nut sleeve; 57. Connecting frame; 572. Slide rod; 5721. Stop plate; 5722. Compound spring; 58. Sensor; 581. Sensor one; 582. Sensor two; 6. Claw clamp assembly; 61. Hinge frame; 62. Clamp seat; 621. Fixed clamp block; 6211. Abutment groove; 63. Handle screw; 631. Moving clamp block; 64. Engaging groove. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1

[0031] like Figures 1 to 7 As shown, this embodiment of the invention provides a servo-driven fully automatic tension testing device for wires, including an integrally formed connecting platform 1 and a connecting platform 2.

[0032] Please refer to Figure 1 and Figure 2 Connecting platform seat 1 and connecting platform seat 2 are preferably integrally cast from cast iron or marble to ensure sufficient rigidity and vibration resistance of the overall frame. Connecting platform seat 2 is located to the left of connecting platform seat 1 (within the left of the right). Figure 1 (Based on the viewing angle) and higher than the connecting platform 1, the two are connected by an integrally formed connecting part. A tensioner 3 is fixedly installed on the top horizontal mounting surface of the connecting platform 2. The tensioner 3 preferably adopts an S-type tension-compression weighing sensor or a spoke sensor, and its sensing direction is horizontally facing the connecting platform 1. A PLC controller 4 is also installed at the top of the connecting platform 2. The PLC controller 4 is electrically connected to the tensioner 3, the servo motor 51 and the sensor 58.

[0033] Please refer to Figures 1 to 3A servo drive mechanism 5 is provided on the connecting platform 1. The servo drive mechanism 5 includes a servo motor 51 and a slide assembly 52. ​​Two guide rail grooves 54 are symmetrically opened at the top of the connecting platform 1 along its length. The cross-section of the two guide rail grooves 54 is preferably V-shaped or dovetail-shaped to ensure guiding accuracy. A slide block 55 is slidably installed between the two guide rail grooves 54. The bottom end of the slide block 55 is provided with a slider structure that slides with the guide rail grooves 54. A lead screw 53 is rotatably installed on the inner side of the connecting platform 1 (i.e., in the middle cavity of the connecting platform 1) along its length. One end of the slide block 55 passes through the end of the connecting platform 1 and is connected to the output end of the servo motor 51 via a coupling. A fixed arm 56 is fixedly installed at the bottom end of the slide block 55. The fixed arm 56 extends downward from the bottom end of the slide block 55 to the height of the lead screw 53. A nut sleeve 561 is fixedly installed on the inner side of the fixed arm 56. The nut sleeve 561 is sleeved on the outer surface of the lead screw 53 and threadedly engaged with the lead screw 53. Thus, when the servo motor 51 drives the lead screw 53 to rotate, the nut sleeve 561 moves along the axial direction of the lead screw 53, and the fixed arm 56 drives the slide block 55 to make horizontal linear motion along the guide groove 54.

[0034] It should be noted that limit photoelectric switches or mechanical limit blocks can also be installed at both ends of the lead screw 53 to prevent the slide 55 from exceeding the preset stroke range.

[0035] Please refer to Figures 3 to 6 A connecting frame 57 is slidably mounted on the upper side of the slide block 55. Several sliding rods 572 are slidably mounted through the upper side of the slide block 55. The upper end of each sliding rod 572 is fixedly connected to the bottom end of the connecting frame 57. The lower end of each sliding rod 572 protrudes from the lower surface of the slide block 55 and is fixedly mounted with a stop plate 5721. A compound spring 5722 is also sleeved on the outer surface of each sliding rod 572. The top end of the compound spring 5722 abuts against the lower surface of the slide block 55, and the bottom end of the compound spring 5722 abuts against the upper surface of the stop plate 5721. In a natural state (i.e., when the connecting frame 57 is not subjected to external force), the compound spring 5722 pushes the slide block 55 upward (or pulls the connecting frame 57 downward) to maintain a relatively stable distance between the connecting frame 57 and the slide block 55.

[0036] Sensors 58 are mounted on the opposite surfaces of the slide 55 and the connecting frame 57. Sensors 58 include sensor 1 581 and sensor 2 582. Sensor 1 581 is fixedly mounted on the upper surface of the slide 55, and sensor 2 582 is fixedly mounted on the lower surface of the connecting frame 57. Sensor 1 581 and sensor 2 582 are arranged in a vertical pair facing each other. Sensor 1 581 and sensor 2 582 are preferably metal proximity switches or Hall effect displacement sensors. When the distance between them changes, a corresponding electrical signal can be output to the PLC controller 4.

[0037] Please refer to Figure 1 , Figure 4and Figure 7 The sensing end of the tensioner 3 (i.e. the end of the tensioner 3 facing the connecting platform 1) and the upper end of the connecting frame 57 are respectively equipped with claw clamp assemblies 6. The two claw clamp assemblies 6 have the same structure. The following describes one of them in detail.

[0038] The jaw clamp assembly 6 includes a clamp base 62, which is L-shaped. A fixed clamping block 621 is fixedly installed on the upper surface of its horizontal section, and a handle screw 63 is threaded through its vertical section. The axis of the handle screw 63 is perpendicular to the clamping surface of the fixed clamping block 621. A movable clamping block 631 is rotatably installed at the end of the handle screw 63 near the fixed clamping block 621. The movable clamping block 631 is positioned opposite to the fixed clamping block 621. When the handle screw 63 is rotated, the handle screw 63 feeds back and forth relative to the vertical section of the clamp base 62, pushing the movable clamping block 631 closer to or away from the fixed clamping block 621, thereby clamping or releasing the wire.

[0039] As one of the core improvements of this invention, a hinge frame 61 is rotatably mounted on one side of the horizontal section of the clamp 62. The hinge frame 61 is a U-shaped or annular frame. The clamp 62 is rotatably connected to the hinge frame 61. The hinge frame 61 of one claw clamp assembly 6 is fixedly connected to the sensing end of the tensioner 3, and the hinge frame 61 of the other claw clamp assembly 6 is fixedly connected to the upper end of the connecting frame 57. Through this hinge frame 61 structure, the two claw clamp assemblies 6 are rotatably connected to the tensioner 3 and the connecting frame 57 respectively, so that the clamp 62 can freely swing at a small angle around the hinge axis in the vertical plane.

[0040] Please refer to Figure 7 A notch 6211 is provided on the side of the fixed clamping block 621 away from the movable clamping block 631 (i.e., the back side of the fixed clamping block 621). The notch 6211 is used to limit the clamping end of the wire and prevent the wire from moving left and right during the clamping process. The movable clamping block 631 and the fixed clamping block 621 are also provided with a meshing groove 64 on their opposite surfaces. The meshing groove 64 is preferably a cross knurled pattern or a V-shaped tooth pattern, which is used to increase the friction between the clamping surface and the wire and prevent the wire from slipping during the stretching process.

[0041] In addition, the two jaw clamping assemblies 6 are staggered in the horizontal direction, that is, the line connecting the clamping centers of the two jaw clamping assemblies 6 is parallel to the sliding direction of the slide assembly 52 in the top view, and the two clamping points are located on the same horizontal straight line, thereby ensuring that the measured wire is in a horizontal state after clamping.

[0042] Working principle:

[0043] Step 1: Clamping the wire. The operator first rotates the handle screws 63 on both jaw clamp assemblies 6 according to the diameter of the wire to be measured, causing the movable clamping block 631 to retract to sufficient space. One end of the wire is then passed between the fixed clamping block 621 and the movable clamping block 631 of one jaw clamp assembly 6, with the end of the wire abutting against the groove 6211. The handle screws 63 are then rotated in the opposite direction, causing the movable clamping block 631 and the fixed clamping block 621 to close, and the engagement groove 64 presses against the surface of the wire. The other end of the wire is clamped in the other jaw clamp assembly 6 in the same manner. Since both jaw clamp assemblies 6 are rotatably connected to the corresponding mounting base via the hinge frame 61, after clamping, the clamp 62 will automatically sway slightly under the slight traction of the wire, causing the line connecting the two clamping points to automatically become parallel to the sliding direction of the slide block 55.

[0044] Step 2: Parameter setting. The operator sets the stretching speed and stretching distance for this test through the touch screen of PLC controller 4. PLC controller 4 calculates the speed pulse and total number of pulses of servo motor 51 according to the set parameters.

[0045] Step 3: Execute the stretching. The operator steps on the foot switch or clicks the start button on the touch screen. The PLC controller 4 sends a drive signal to the servo motor 51. The servo motor 51 drives the lead screw 53 to rotate at the set speed. The lead screw sleeve 561 moves along the axis of the lead screw 53. Through the fixed arm 56, it drives the slide 55 to move in a uniform linear motion along the guide rail groove 54 away from the tensioner 3. The slide 55 drives the connecting frame 57 to move synchronously through the slide rod 572. The claw clamp assembly 6 on the connecting frame 57 stretches the wire accordingly.

[0046] During this process, the tension borne by the wire is transmitted to the tensioner 3 through the claw clamp assembly 6 and the hinge frame 61. The tensioner 3 collects the tension signal in real time and feeds it back to the PLC controller 4. At the same time, the encoder of the servo motor 51 records the displacement of the slide 55 in real time.

[0047] Step 4: Fracture response and data recording. When the wire is stretched to the fracture limit, the wire breaks instantly, and the external tensile load returns to zero. At this time, the downward or horizontal traction force on the connecting frame 57 disappears. Under the elastic restoring force of the compound spring 5722, the connecting frame 57 undergoes a slight displacement relative to the slide 55, that is, the slide rod 572 slides along the through hole of the slide 55. This displacement causes a sudden change in the distance between sensor 1 581 and sensor 2 582. The sensor 58 immediately transmits the sudden change signal to the PLC controller 4.

[0048] After receiving the breakage signal, the PLC controller 4 simultaneously reads the position pulse count of the encoder of the servo motor 51 at the current moment. Since the lead of the lead screw 53 is a known fixed value, the PLC controller 4 calculates the total displacement of the slide 55 from the starting position to the breakage position by the pulse count. This displacement is the limit elongation of the wire. At the same time, the PLC controller 4 records the maximum tensile force value collected by the tensioner 3 just before the breakage, which is the tensile breaking force of the wire.

[0049] Meanwhile, due to the combined effect of frictional damping between the lead screw 53 and the lead nut sleeve 561 and electromagnetic damping of the servo motor 51, the slide block 55 will not experience significant excessive forward thrust or rebound due to inertia at the moment of fracture, but will remain basically stationary at the position where the fracture occurs, further ensuring the accuracy of the displacement data.

[0050] Step 5: Automatic Reset. After completing one test, the PLC controller 4 controls the servo motor 51 to rotate in the opposite direction, driving the slide 55 to move along the guide rail groove 54 to the starting position (initial clamping position), waiting for the next test. The operator rotates the handle screw 63 to loosen the moving clamp 631, removes the broken wire fragment, and can then proceed to the next test.

[0051] Example 2

[0052] Unlike Embodiment 1, the jaw clamp assembly 6 in this embodiment uses an electrically controlled jaw instead of a manually rotating handle screw 63. Specifically, the jaw clamp assembly 6 includes an electrically controlled jaw, which is electrically connected to the PLC controller 4. The PLC controller 4 controls the clamping and releasing actions of the electrically controlled jaw through a solenoid valve or a driver. The electrically controlled jaw is preferably an electric finger or a pneumatic finger. The operator triggers the clamping / releasing command through a touch screen or foot switch to realize the automatic clamping and releasing of the wire, further improving the automation level of the test. The remaining structure and working principle are the same as in Embodiment 1.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "include," "contain," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A servo-driven fully automatic tension testing device for silk threads, comprising an integrally formed connecting platform seat one (1) and a connecting platform seat two (2), characterized in that: A servo drive mechanism (5) is provided on the first connecting platform (1), and a tensioner (3) is installed on the top of the second connecting platform (2). The servo drive mechanism (5) includes a slide assembly (52) slidably disposed on the first connecting platform (1) and a servo motor (51) driving the slide assembly (52). A claw assembly (6) is respectively disposed between the slide assembly (52) and the tensioner (3). The two claw assemblies (6) are rotatably connected to the slide assembly (52) and the tensioner (3) respectively. The two claw assemblies (6) are arranged horizontally and staggered. The slide assembly (52) and the claw assembly (6) above it are slidably disposed up and down, and a sensor (58) is directly disposed between the slide assembly (52) and the claw assembly (6) above it. A PLC controller (4) is installed on one end of the second connecting platform (2).

2. The servo-driven fully automatic tension testing device for yarn as described in claim 1, characterized in that: The slide assembly (52) includes a lead screw (53) and a plurality of guide rail grooves (54). The plurality of guide rail grooves (54) are symmetrically opened at the top of the connecting platform seat (1). The lead screw (53) is installed on the inner side of the connecting platform seat (1). A slide block (55) is slidably installed between the plurality of guide rail grooves (54). A fixing arm (56) is fixedly installed at the bottom end of the slide block (55). A threaded nut sleeve (561) that is threadedly connected to the lead screw (53) is installed on the inner side of the fixing arm (56).

3. The servo-driven fully automatic tension testing device for yarn as described in claim 2, characterized in that: A connecting frame (57) is slidably disposed on the upper side of the slide (55). The sensor (58) includes sensor one (581) and sensor two (582). Sensor one (581) and sensor two (582) are symmetrically mounted on the opposite surfaces of the slide (55) and the connecting frame (57).

4. The servo-driven fully automatic tension testing device for yarn as described in claim 3, characterized in that: Several slide rods (572) are slidably installed on the upper side of the slide block (55), and the slide rods (572) are all fixed to the bottom end of the connecting frame (57).

5. The servo-driven fully automatic tension testing device for yarn as described in claim 4, characterized in that: A stop plate (5721) is installed at the bottom end of each of the slide rods (572), and a compound spring (5722) is sleeved on the outer surface of each of the slide rods (572). The two ends of the compound spring (5722) abut against the opposite surfaces of the slide block (55) and the stop plate (5721).

6. The servo-driven fully automatic tension testing device for yarn as described in claim 1, characterized in that: The claw assembly (6) includes a clamp seat (62), which is L-shaped. A handle screw (63) is threaded through one end of the clamp seat (62) in the vertical direction. A fixed clamping block (621) is installed at the top of the clamp seat (62) in the horizontal direction. A movable clamping block (631) is rotatably installed on one end of the handle screw (63) near the fixed clamping block (621).

7. The servo-driven fully automatic tension testing device for yarn as described in claim 6, characterized in that: The clamp (62) is rotatably mounted with a hinge frame (61) on one side in the horizontal direction. The clamp (62) is hinged to the tensioner (3) or the connecting frame (57) through the hinge frame (61).

8. The servo-driven fully automatic tension testing device for yarn as described in claim 6, characterized in that: A notch (6211) is provided on the side of the fixed clamping block (621) away from the moving clamping block (631).

9. The servo-driven fully automatic tension testing device for yarn as described in claim 1, characterized in that: The moving clamping block (631) and the fixed clamping block (621) have a common engagement groove (64) between their opposing surfaces.

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