Knitting needle elastic property detection device

Abstract

The invention relates to the technical field of textile machinery and test and measurement, and particularly discloses a knitting needle elastic property detection device, which comprises a base, a fixer, a detection system and a force application mechanism, the force application mechanism comprises an eccentric wheel, a motion conversion mechanism and an elastic positioning assembly which are arranged in the mounting shell, and the eccentric wheel is driven by a power source to rotate; the multiple impact parts are evenly distributed along a semi-arc track, the motion conversion mechanism converts rotary motion of the eccentric wheel into oblique impact through rack-gear orthogonal transmission, and the elastic positioning assembly directly outputs vertical impact. The limiting grooves and the limiting blocks cooperatively control the multiple impact pieces to act in sequence in a single rotation period and do not overlap with one another. The detection system quantifies elastic attenuation after impact through a displacement sensor. According to the invention, multidirectional composite stress simulation is realized by a pure mechanical structure, the problem of distortion of traditional unidirectional loading is solved, and the reliability of crochet hook elastic failure detection is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of textile machinery and testing and measurement, and particularly relates to a knitting needle elasticity performance detection device. Background Art

[0002] Knitting needles are the core actuators for forming coils in knitting machinery. They are primarily classified into three categories based on their loop-forming principles: hook needles, latch needles, and compound needles. Hook needles (spring needles), a key component of high-speed warp knitting machines, must withstand the combined loads of periodic compression from the pressure plate (closing the needle opening) and self-elastic rebound (opening the needle opening) during the knitting process. This elasticity directly determines the needle breakage rate, fabric defect rate, and overall equipment efficiency.

[0003] Currently, the industry lacks specialized testing equipment specifically for the elastic properties of crochet hooks. Existing elasticity testing equipment (such as modified fixtures for spring testing machines) generally uses a vertical, unidirectional loading mode: a force-applying mechanism applies static or cyclic pressure vertically downward to the hook, and a displacement sensor measures the rebound distance. However, this unidirectional loading method cannot replicate the multi-angle, complex stress states (such as concentrated oblique extrusion stress) caused by mechanical vibration transmission, pressure plate installation tolerances, and yarn tension fluctuations in actual working conditions. This results in a disconnect between the test data and the hook's actual failure mode. Summary of the Invention

[0004] The object of the present invention is to provide a device for detecting the elastic properties of knitting needles to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A knitting needle elasticity performance detection device, comprising: A base, a fixture, and a detection system, wherein a linear transmission assembly is installed in the base, a mounting frame is fixedly provided on the top surface of the linear transmission assembly, a force-applying mechanism is fixedly provided on the mounting frame, a detection needle is provided directly below the force-applying mechanism, the tail end of the detection needle is fixed by a fixture, and the fixture is fixedly provided on the side wall of the base, and the detection system is fixedly provided on the base, with the bottom detection probe facing the needle top of the detection needle; The force-applying mechanism includes a mounting shell fixedly set on a mounting frame, a power source fixedly set on the outer side wall of the mounting shell, an output shaft of the power source passes through the mounting shell and is fixedly connected to an eccentric wheel, motion conversion mechanisms are symmetrically provided on both sides of the eccentric wheel, and an elastic positioning component is provided directly below, the input ends of the motion conversion mechanism and the elastic positioning component are in contact with the outer contour of the eccentric wheel, and the output ends of the motion conversion mechanism and the elastic positioning component are connected to impact pieces, and a plurality of the impact pieces are movable through the bottom of the mounting shell and are evenly distributed along a semicircular arc trajectory.

[0006] Preferably, the motion conversion mechanism includes a laterally arranged swing arm and a guide assembly arranged along the axis of the corresponding impact member. The swing arm is installed in the mounting shell through a sliding assembly, and its two ends are symmetrically chamfered in semicircular shapes, and the arc-shaped outer wall contacts the outer contour of the eccentric wheel. At the same time, a reset assembly is provided on the top surface of the swing arm, and the guide assembly is fixedly installed inside the mounting shell, and drives the corresponding impact member to slide along its axis. A steering assembly for converting the direction of motion is provided between the angle between the swing arm and the guide assembly.

[0007] Preferably, the steering assembly includes a transmission gear rotatably arranged in the mounting shell, and the outer wall of the transmission gear is respectively meshed with a first rack and a second rack that are staggered with each other. The first rack is arranged along the axis direction of the swing arm and is fixedly arranged on the bottom surface of the swing arm, and the second rack is arranged along the axis direction of the guide assembly and is fixedly arranged on the guide assembly.

[0008] Preferably, the reset assembly includes a moving block fixedly arranged on the top surface of the swing rod and a fixed block fixedly arranged on the inner side wall of the mounting shell, and a reset spring is fixedly arranged between the moving block and the fixed block.

[0009] Preferably, a limiting block is provided on a side of the movable block away from the fixed block, and the limiting block is fixedly provided on the inner side wall of the mounting shell; The eccentric wheel is provided with two arc-shaped limit grooves, which are symmetrically distributed with the rotation center of the eccentric wheel as the axis, and the center of the limit groove and the rotation center are in the same plane, which are used to cooperate with the limit block to form a sliding constraint of the swing rod.

[0010] Preferably, the sliding assembly includes a sliding groove opened on the side wall of the swing rod and a plurality of I-shaped rollers slidingly arranged in the sliding groove. The sliding groove is a through-type U-shaped groove. The plurality of rollers all pass through the sliding groove, and their middle shaft sections are all embedded in the sliding groove. The center of the roller is rotatably connected to a coaxially arranged fixed shaft through a bearing, and the fixed shaft is fixedly arranged on the mounting shell.

[0011] Preferably, the guide assembly includes a linear guide rail fixedly arranged on the inner wall of the mounting shell, a slider is installed on the linear guide rail, the outer wall of the slider is fixedly connected to the second rack, and a through hole is provided at the end away from the linear guide rail, a connecting shaft arranged along the axis of the corresponding impact member is fixedly arranged in the through hole, and the end face of the connecting shaft is fixedly connected to the corresponding impact member.

[0012] Preferably, the plurality of impact members include a first impact rod, a second impact rod and a third impact rod, and the impact directions thereof form angles of 45°, 90° and 135° with the horizontal direction respectively.

[0013] Preferably, the elastic positioning assembly includes a positioning spring sleeved on the outer periphery of the second impact rod, one end of the positioning spring is fixedly provided on the bottom surface inside the mounting shell, and the other end is fixedly provided with a floating ball head, the top surface of the floating ball head contacts the outer contour of the eccentric wheel, and the bottom surface is fixedly connected to the second impact rod.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) Through the uniaxial rotation of the eccentric wheel, multiple impact members evenly distributed along the semicircular arc trajectory are coordinated and controlled. Within a single rotation cycle of the eccentric wheel, each impact member is sequentially driven along the axis of the preset angle to extend the impact detection needle, and the actions are strictly non-overlapping. The phenomenon of oblique stress concentration caused by the deviation of the pressure plate installation and the fluctuation of the yarn tension in the actual working condition of the crochet needle is accurately reproduced. Compared with the traditional unidirectional vertical loading, the multi-directional impact of the present invention improves the correlation between the elastic failure detection of the crochet needle and the actual broken needle, and can quantify the elastic attenuation gradient at different angles, providing key data support for the optimization of the crochet needle material process.

[0015] (2) Through the staggered meshing of two gears and a rack, the rotational input of the eccentric wheel is converted into a linear impact output at any angle. Through the phase coordination design of the limit slot and the limit block, it is ensured that multiple impact parts extend in sequence and do not overlap each other, achieving a microsecond response without an electronic control unit, reducing equipment costs and maintenance thresholds. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A perspective view of the present invention; Figure 2 for Figure 1 A magnified view of the structure at point A; Figure 3 A three-dimensional diagram of the internal structure of the mounting shell of the present invention; Figure 4 A rear perspective view of the mounting housing of the present invention; Figure 5 This is a vertical view of the eccentric wheel of the present invention when squeezing the swing rod; Figure 6 It is an elevation view of the eccentric wheel of the present invention when it rotates to the lower left corner; In the figure: 1. Base; 2. Fixer; 3. Detection system; 4. Mounting frame; 5. Mounting shell; 6. Eccentric wheel; 7. Motion conversion mechanism; 8. Elastic positioning assembly; 9. Power source; 10. Impact member; 11. Detection needle; 61. Limiting groove; 71. Swinging rod; 72. Guide assembly; 73. Sliding assembly; 74. Reset assembly; 75. Steering assembly; 81. Positioning spring; 82. Floating ball head; 101. First impact rod; 102. Second impact rod; 103. Third impact rod; 721, linear guide rail; 722, slider; 723, connecting shaft; 731, sliding groove; 732, roller; 733, fixed shaft; 741, moving block; 742, return spring; 743, fixed block; 744, limit block; 751, transmission gear; 752, first rack; 753, second rack. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. Example 1:

[0019] See also Figures 1-6 As shown, a knitting needle elasticity performance detection device comprises: Base 1, holder 2 and detection system 3, a linear transmission assembly is installed in the base 1, a mounting frame 4 is fixedly provided on the top surface of the linear transmission assembly, a force-applying mechanism is fixedly provided on the mounting frame 4, a detection needle 11 is provided directly below the force-applying mechanism, the tail end of the detection needle 11 is fixed by the holder 2, the holder 2 is fixedly provided on the side wall of the base 1, and the detection system 3 is fixedly provided on the base 1, with the detection probe at the bottom thereof facing the needle top of the detection needle 11; The force-applying mechanism includes a mounting shell 5 fixedly set on the mounting frame 4, and a power source 9 is fixedly set on the outer wall of the mounting shell 5. The output shaft of the power source 9 passes through the mounting shell 5 and is fixedly connected to the eccentric wheel 6. Motion conversion mechanisms 7 are symmetrically arranged on both sides of the eccentric wheel 6, and an elastic positioning component 8 is arranged directly below. The input ends of the motion conversion mechanism 7 and the elastic positioning component 8 are in contact with the outer contour of the eccentric wheel 6, and the output ends of the motion conversion mechanism 7 and the elastic positioning component 8 are connected to the impact piece 10. Multiple impact pieces 10 are movable through the bottom of the mounting shell 5 and are evenly distributed along a semicircular arc trajectory.

[0020] Depend on Figure 3 It can be seen that the motion conversion mechanism 7 includes a laterally arranged swing rod 71 and a guide assembly 72 arranged along the axis of the corresponding impact member 10. The swing rod 71 is installed in the mounting shell 5 through a sliding assembly 73. Its two ends are symmetrically chamfered in semicircular shapes, and the arc-shaped outer wall contacts the outer contour of the eccentric wheel 6. At the same time, a reset assembly 74 is provided on the top surface of the swing rod 71. The guide assembly 72 is fixedly installed inside the mounting shell 5 and drives the corresponding impact member 10 to slide along its axis. A steering assembly 75 for converting the direction of movement is provided between the angle between the swing rod 71 and the guide assembly 72.

[0021] As can be seen from the above, when it is necessary to detect the crochet needle, first, the detection needle 11 is fixed to the top surface of the base 1 through the holder 2 (the holder 2 is a fixing device conventionally used by those skilled in the art to fix the knitting needle, which belongs to the prior art and will not be described in detail). Then, the detection system 3 is used to read the initial data of the detection needle 11. Then, the mounting shell 5 and its internal structure are moved to the top of the detection needle 11 through the linear transmission component inside the base 1, and the tail end of the vertical impact member 10 is aligned with the needle top of the detection needle 11. Then, the power source 9 (the power source 9 includes but is not limited to any driving device that can provide rotational power, such as a servo motor, which belongs to the prior art) is used. The eccentric wheel 6 is driven to rotate, thereby driving multiple impact members 10 to impact the detection knitting needle 11 in sequence and reciprocatingly, and pressing its needle tip into the needle groove to achieve multi-angle cyclic impact. After completing the impact within a limited number of times, the mounting shell 5 is moved to the side through the linear transmission component, and the detection system 3 is started to detect the rebound data of the detection knitting needle 11 after multiple impacts. The detection system 3 is used as a core functional module to capture the rebound process of the knitting needle after being compressed by the force-applying mechanism in real time. Through laser non-contact detection technology, the displacement change of the needle top of the detection knitting needle 11 is accurately obtained, and finally the elastic performance parameters (such as rebound distance, rebound rate, etc.) are converted; The above detection process is specifically as follows: When the power source 9 drives the eccentric wheel 6 to rotate, its outer contour first squeezes the swing rod 71 of the motion conversion mechanism 7 on one side (the semicircular chamfers at both ends ensure smooth contact), forcing the swing rod 71 to slide laterally along the sliding assembly 73. At this point, the swing rod 71 drives the slider 722 on the guide assembly 72 through the steering assembly 75 to move linearly, ultimately driving the impact member 10 connected to the guide assembly 72 (e.g., at a 45° or 135° angle) to extend and laterally impact the detection needle 11. When the eccentric wheel 6 continues to rotate until it disengages the current swing rod 71, the reset assembly 74 resets the swing rod 71, retracting the oblique impact member 10. Simultaneously, the rotation of the eccentric wheel 6 gradually acts on the elastic positioning assembly 8 directly below, directly pushing the impact member 10 at the center of the elastic positioning assembly 8 (at a 90° angle) to vertically impact the tip of the detection needle 11. As the eccentric wheel 6 rotates, it contacts the motion conversion mechanism 7 on the symmetrical side, repeating the above process to drive the impact member 10 at the other angle. In this cycle, the three impact members 10 extend sequentially along the axis of the pre-set angle to impact the test needle 11 within a single rotation of the eccentric wheel 6, with no overlap. After completing the set number of impacts, the linear drive assembly moves the mounting frame 4 away from directly above the test needle 11. The laser probe of the detection system 3 then measures the residual displacement of the needle tip and, combined with the initial data, calculates the elastic attenuation rate.

[0022] For details about the above, refer to Figure 3 and Figure 5 As shown, the steering assembly 75 includes a transmission gear 751 rotatably disposed within the mounting housing 5. The outer wall of the transmission gear 751 is respectively engaged with a first rack 752 and a second rack 753 that are staggered with each other. The first rack 752 is disposed along the axis of the swing rod 71 and is fixedly disposed on the bottom surface of the swing rod 71. The second rack 753 is disposed along the axis of the guide assembly 72 and is fixedly disposed on the guide assembly 72. The sliding assembly 73 includes a sliding groove 731 formed on the side wall of the swing rod 71 and a plurality of I-shaped rollers 732 slidably disposed within the sliding groove 731. The sliding groove 731 is a through-type U-shaped groove. The plurality of rollers 732 extend through the sliding groove 731, with their middle shaft sections being fitted within the sliding groove 731. The center of the roller 732 is rotatably connected to a coaxial fixed shaft 733 via a bearing. The fixed shaft 733 is fixedly disposed on the mounting housing 5. The guide assembly 72 includes a linear guide rail 721 fixedly set on the inner wall of the mounting shell 5, and a slider 722 is installed on the linear guide rail 721. The outer wall of the slider 722 is fixedly connected to the second rack 753, and a through hole is opened at the end away from the linear guide rail 721. A connecting shaft 723 arranged along the axis of the corresponding impact member 10 is fixedly set in the through hole, and the end face of the connecting shaft 723 is fixedly connected to the corresponding impact member 10.

[0023] As can be seen from the above, when the outer contour of the eccentric wheel 6 squeezes the arc-shaped outer wall of the swing rod 71 on the left, the swing rod 71 slides horizontally along its axis under the constraint of the sliding component 73: at this time, the I-shaped roller 732 rolls in the sliding groove 731, and its bearing structure converts sliding friction into rolling friction, significantly reducing the movement resistance; at the same time, the first rack 752 fixed on the bottom surface of the swing rod 71 synchronously translates outward, driving the transmission gear 751 meshing with it to rotate counterclockwise. 752 is arranged in a spatially staggered manner. The rotation of the transmission gear 751 transmits torque to the second rack 753 that is orthogonally meshed with it, forcing the second rack 753 to slide downward along the oblique axis (45° oblique) of the guide assembly 72; the linear motion of the second rack 753 is transmitted to the linear guide rail 721 through the slider 722, forcing the slider 722 to slide precisely along the guide rail, and finally pushes the corresponding impact member 10 to extend precisely along its preset angle through the connecting shaft 723, thereby achieving a directional impact on the tip of the detection knitting needle 11.

[0024] For details about the above, refer to Figure 3 As shown, the plurality of impact members 10 include a first impact rod 101 , a second impact rod 102 and a third impact rod 103 , and the impact directions thereof form angles of 45°, 90° and 135° with the horizontal direction respectively.

[0025] As can be seen from the above, the single rotational motion of the eccentric wheel 6 drives the coordinated action of the three-way impact member 10 through spatial time sequence decomposition: when the eccentric wheel 6 rotates to the right contour to squeeze the left swing rod 71, the motion conversion mechanism 7 converts the lateral displacement through the engagement of the transmission gear 751 and the first rack 752, and converts the second rack 753 into an oblique downward sliding along the 135° guide axis (corresponding to the axis of the third impact rod 103), pushing the third impact rod 103 to impact the tip of the detection knitting needle 11 at an angle of 135°; when the eccentric wheel 6 continues to rotate to the floating ball head 82 of the elastic positioning component 8 under the contour directly below, the positioning spring 81 is compressed, directly driving the second impact rod 102 to impact downward along the 90° vertical direction; when the eccentric wheel 6 rotates to the left contour to squeeze the right swing rod 71, the symmetrical motion conversion mechanism 7 works, pushing the first impact rod 101 to impact obliquely downward along the 45° guide axis. The contour curve of the eccentric wheel 6 accurately controls the three groups of actions to be independently triggered in the phase intervals of 0°-120°, 120°-240°, and 240°-360°, ensuring that the actions of the 45° (first), 90° (second), and 135° (third) impact rods are completely separated in time and space, eliminating mechanical interference, and each impact rod moves strictly along its own axis (45° / 90° / 135°), so that the force direction of the multi-angle impact is highly consistent with the composite stress field in the actual working conditions of the crochet hook. Example 2:

[0026] refer to Figure 5As shown, the elastic positioning assembly 8 includes a positioning spring 81 that is sleeved on the outer periphery of the second impact rod 102. One end of the positioning spring 81 is fixedly set on the bottom surface inside the mounting shell 5, and the other end is fixedly provided with a floating ball head 82. The top surface of the floating ball head 82 contacts the outer contour of the eccentric wheel 6, and the bottom surface is fixedly connected to the second impact rod 102.

[0027] As can be seen from the above, when the eccentric wheel 6 rotates to the phase with minimum eccentricity (base circle segment), the floating ball head 82 maintains a slight pre-stressed state under the tension of the positioning spring 81, ensuring that the second impact rod 102 is in the standby zero position; when the eccentric wheel 6 rotates to the phase with increased eccentricity (such as the cam lift segment), its contour presses down the floating ball head 82, forcing the positioning spring 81 to compress and store energy, and at the same time pushes the second impact rod 102 to move downward precisely along the 90° vertical axis, thereby achieving a vertical impact on the needle tip of the detection needle 11; when the eccentric wheel 6 rotates away from the lift segment, the positioning spring 81 releases elastic potential energy, drives the floating ball head 82 back to the top and fits the contour of the eccentric wheel 6, and simultaneously drives the second impact rod 102 to retract and return to its original position. This design achieves the axial positioning and automatic resetting of the second impact rod 102 in a purely mechanical manner. The spherical contact structure of its floating ball head 82 adaptively compensates for the contour deviation of the eccentric wheel 6 to avoid jamming. The bidirectional action of the positioning spring 81 (pre-load contact + impact energy storage) not only ensures the impact timing accuracy, but also does not require an additional drive unit, significantly improving the system reliability.

[0028] Preferably, reference Figure 5 As shown, the reset assembly 74 includes a moving block 741 fixedly arranged on the top surface of the swing rod 71 and a fixed block 743 fixedly arranged on the inner wall of the mounting shell 5, and a reset spring 742 is fixedly arranged between the moving block 741 and the fixed block 743.

[0029] As can be seen from the above, when the outer contour of the eccentric wheel 6 squeezes the arc-shaped end surface of the swing rod 71, the swing rod 71 slides laterally along the sliding assembly 73, and synchronously drives the moving block 741 fixed on its top surface to approach the fixed block 743, so that the reset spring 742 is squeezed and stores energy; when the eccentric wheel 6 rotates to separate from the contact area of ​​the swing rod 71, the reset spring 742 releases its elastic potential energy, pulling the moving block 741 back, forcing the swing rod 71 to slide in the opposite direction and reset, and then drives the transmission gear 751 to reverse through the first rack 752, driving the second rack 753 and the impact member 10 (45° or 135° direction) to retract precisely along the axis.

[0030] Preferably, reference Figure 6 As shown, a limiting block 744 is provided on one side of the movable block 741 away from the fixed block 743 , and the limiting block 744 is fixedly provided on the inner side wall of the mounting shell 5 ; Two arc-shaped limit grooves 61 are provided on the eccentric wheel 6. The two limit grooves 61 are symmetrically distributed with the rotation center of the eccentric wheel 6 as the axis, and the center of the limit groove 61 and the rotation center are in the same plane, which are used to cooperate with the limit block 744 to form a sliding constraint of the swing rod 71. Furthermore, the arc radius of the limit groove 61 is greater than or equal to the radius of the semicircular chamfer of the swing rod 71.

[0031] As can be seen from the above, in order to allow the extension actions of the three impact rods to be triggered sequentially and without overlapping within a single rotation cycle of the eccentric wheel 6, it is necessary to ensure that the first impact rod 101 can be quickly retracted after the eccentric wheel 6 has squeezed the swing rod 71 on the left side. To do so, it is necessary to ensure that the eccentric wheel 6 does not restrict the swing rod 71. The limiting groove 61 achieves this purpose, and the arc radius (R1) of the limiting groove 61 is greater than the chamfer radius (R2) of the swing rod 71 (R1≥R2+δ), which completely eliminates the risk of reset interference and ensures the absolute isolation of the three impact rods during the extension and retraction action; when the eccentric wheel 6 is disengaged from the swing rod 71 (corresponding to the phase of the limiting groove 61), the reset spring 742 pulls the moving block 741 back in the direction away from the fixed block 743, and the limit block 744, as a rigid stop block fixed to the mounting shell 5, directly intercepts the reset path of the moving block 741, so that the swing rod 71 stops stably at the initial zero position, avoiding the transmission gear 751 from disengaging from the first rack 752.

[0032] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A knitting needle elasticity performance detection device, characterized in that: include: A base (1), a fixture (2) and a detection system (3), wherein a linear transmission assembly is installed in the base (1), a mounting frame (4) is fixedly provided on the top surface of the linear transmission assembly, a force-applying mechanism is fixedly provided on the mounting frame (4), a detection needle (11) is provided directly below the force-applying mechanism, the tail end of the detection needle (11) is fixed by the fixture (2), the fixture (2) is fixedly provided on the side wall of the base (1), and the detection system (3) is fixedly provided on the base (1), with a detection probe at the bottom thereof facing the needle top of the detection needle (11); The force-applying mechanism comprises a mounting shell (5) fixedly mounted on a mounting frame (4), a power source (9) fixedly mounted on an outer wall of the mounting shell (5), an output shaft of the power source (9) passing through the mounting shell (5) and fixedly connected to an eccentric wheel (6), motion conversion mechanisms (7) symmetrically arranged on both sides of the eccentric wheel (6), and an elastic positioning assembly (8) arranged directly below, the input ends of the motion conversion mechanism (7) and the elastic positioning assembly (8) both contact the outer contour of the eccentric wheel (6), the output ends of the motion conversion mechanism (7) and the elastic positioning assembly (8) are both connected to an impact member (10), and a plurality of the impact members (10) are movable through the bottom of the mounting shell (5) and are evenly distributed along a semicircular arc trajectory.

2. A knitting needle elasticity performance detection device according to claim 1, characterized in that: The motion conversion mechanism (7) includes a laterally arranged swing rod (71) and a guide assembly (72) arranged along the axis of the corresponding impact member (10). The swing rod (71) is installed in the mounting shell (5) through a sliding assembly (73). Its two ends are symmetrically chamfered in a semicircular arc shape, and the arc outer wall contacts the outer contour of the eccentric wheel (6). At the same time, a reset assembly (74) is provided on the top surface of the swing rod (71). The guide assembly (72) is fixedly installed inside the mounting shell (5) and drives the corresponding impact member (10) to slide along its axis. A steering assembly (75) for converting the motion direction is provided between the angle between the swing rod (71) and the guide assembly (72).

3. A knitting needle elasticity performance detection device according to claim 2, characterized in that: The steering assembly (75) includes a transmission gear (751) rotatably arranged in the mounting shell (5), and the outer wall of the transmission gear (751) is respectively meshed with a first rack (752) and a second rack (753) that are staggered with each other, the first rack (752) being arranged along the axis direction of the swing rod (71) and fixedly arranged on the bottom surface of the swing rod (71), and the second rack (753) being arranged along the axis direction of the guide assembly (72) and fixedly arranged on the guide assembly (72).

4. A knitting needle elasticity performance detection device according to claim 2, characterized in that: The reset assembly (74) comprises a moving block (741) fixedly arranged on the top surface of the swing rod (71) and a fixed block (743) fixedly arranged on the inner side wall of the mounting shell (5), and a reset spring (742) is fixedly arranged between the moving block (741) and the fixed block (743).

5. A knitting needle elasticity performance detection device according to claim 4, characterized in that: A limiting block (744) is provided on a side of the movable block (741) away from the fixed block (743), and the limiting block (744) is fixedly provided on the inner side wall of the mounting shell (5); The eccentric wheel (6) is provided with two arc-shaped limiting grooves (61), and the two limiting grooves (61) are symmetrically distributed with the rotation center of the eccentric wheel (6) as the axis, and the center of the limiting grooves (61) and the rotation center are in the same plane, and are used to cooperate with the limiting block (744) to form a sliding constraint for the swing rod (71).

6. A knitting needle elasticity performance detection device according to claim 2, characterized in that: The sliding assembly (73) includes a sliding groove (731) provided on the side wall of the swing rod (71) and a plurality of I-shaped rollers (732) slidingly arranged in the sliding groove (731), wherein the sliding groove (731) is a through-type U-shaped groove, and the plurality of rollers (732) all pass through the sliding groove (731), wherein the middle shaft sections thereof are all embedded in the sliding groove (731), and the center of the roller (732) is rotatably connected to a coaxially arranged fixed shaft (733) via a bearing, and the fixed shaft (733) is fixedly arranged on the mounting shell (5).

7. A knitting needle elasticity performance detection device according to claim 2, characterized in that: The guide assembly (72) includes a linear guide rail (721) fixedly arranged on the inner wall of the mounting shell (5), a slider (722) is installed on the linear guide rail (721), the outer wall of the slider (722) is fixedly connected to the second rack (753), and a through hole is opened at one end of the slider away from the linear guide rail (721), a connecting shaft (723) arranged along the axis of the corresponding impact member (10) is fixedly arranged in the through hole, and the end face of the connecting shaft (723) is fixedly connected to the corresponding impact member (10).

8. The knitting needle elasticity performance detection device according to claim 1, characterized in that: The plurality of impact members (10) include a first impact rod (101), a second impact rod (102) and a third impact rod (103), and their impact directions form angles of 45°, 90° and 135° with the horizontal direction, respectively.

9. The knitting needle elasticity performance detection device according to claim 1, characterized in that: The elastic positioning assembly (8) includes a positioning spring (81) sleeved on the outer periphery of the second impact rod (102), one end of the positioning spring (81) is fixedly arranged on the bottom surface inside the mounting shell (5), and the other end is fixedly provided with a floating ball head (82), the top surface of the floating ball head (82) contacts the outer contour of the eccentric wheel (6), and the bottom surface is fixedly connected to the second impact rod (102).

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