A needle tip size detection apparatus

Abstract

The utility model relates to the field of precision manufacturing technology, especially a needle tip size detection equipment, adopts marble table top and metal table top separate arrangement, marble table top independent installation visual detection mechanism, insulates motion vibration interference, metal table top is along material transmission direction and is equipped with feeding, positioning, sorting mechanism in proper order, forms full process automation operation. Among them, the feeding mechanism is matched with the feeding wheel and the gear row type feeding slope through coaxial assembly, ensures that the material is accurately put into the groove and the needle tip is uniformly oriented, the positioning mechanism adopts the combination of rigid and elastic cylinders, and is matched with nylon clamping jaws to realize accurate positioning and material protection, the visual detection mechanism can be fine-tuned to focus and ensure detection accuracy, the sorting mechanism is matched with the special nylon clamping jaws through the linear module to realize multi-size grading and sorting and convenient collection. The equipment solves the problems of low detection and sorting efficiency, poor precision and material damage in the prior art of precision needle type electrode material, and meets the engineering production demand.

Description

Technical Field

[0001] This utility model relates to the field of precision manufacturing technology, and in particular to a needle tip size detection device. Background Technology

[0002] In the field of precision needle-shaped electrode material processing, it is necessary to accurately detect the needle tip size during the processing and sort the needles based on the detection results.

[0003] However, existing detection and sorting solutions for such precision needle-shaped electrode materials still have significant shortcomings and are difficult to meet actual production requirements. Specifically, the current mainstream detection and sorting methods are mainly manual: operators need to use tools such as microscopes and video microscopes to complete the needle tip size detection. This method is not only greatly affected by the subjective judgment of the personnel, which can easily lead to fluctuations in detection accuracy, but also takes a long time, and operators cannot work continuously for long periods of time, which seriously limits the overall detection and sorting efficiency.

[0004] Besides manual inspection and sorting, there are some general-purpose automatic inspection devices in the existing technology. However, on the one hand, these general-purpose automatic inspection devices can only perform size inspection functions and lack the necessary sorting mechanism. Furthermore, the materials are not positioned and fixed before inspection, making it difficult to accurately align with the needle tip for inspection. On the other hand, conventional sorting equipment mostly uses vibratory feeders for feeding, but vibratory feeders cannot effectively distinguish between the needle tip and the needle tail, resulting in chaotic material posture after feeding. Although some devices have tried using a turntable made of transparent material to drive the workpiece through the lens for inspection, they also lack a material positioning and fixing structure, which cannot meet the accuracy requirements for needle tip size inspection.

[0005] It is evident that neither manual inspection and sorting methods, nor existing automatic inspection equipment or conventional sorting equipment can complete the high-precision and high-efficiency inspection and sorting of precision needle-shaped electrode materials, either alone or in combination. Utility Model Content

[0006] To achieve mechanized and automated needle tip size detection and sorting, and to improve detection efficiency and accuracy, this utility model provides a needle tip size detection device, including a marble table and a metal table. The marble table is provided with a vision detection mechanism, and the metal table is provided with a feeding mechanism, a positioning mechanism and a sorting mechanism in sequence along the material conveying direction. The feeding mechanism includes a feeding ramp and a feeding wheel; the surface of the feeding wheel is provided with a plurality of material grooves parallel to the axial direction; the feeding ramp is inclinedly arranged at the material picking end of the feeding wheel, and the material output end of the feeding ramp corresponds to the material grooves; The positioning mechanism is located at the discharge end of the feeding mechanism and includes a V-shaped bracket, a front positioning cylinder, a rear positioning cylinder, and a positioning clamping assembly. The V-shaped bracket includes a receiving part and a supporting part, with the top of the receiving part corresponding to the material trough. The front positioning cylinder and the rear positioning cylinder are respectively located on both sides of the V-shaped bracket. The front positioning cylinder is a rigid structure that can fix the position of the positioning material needle tip, while the rear positioning cylinder is equipped with an elastic structure that can adapt to materials with slight length deviations.

[0007] In some embodiments, a sorting mechanism is also provided at the discharge end of the positioning mechanism; The sorting mechanism includes a clamping device and a sorting material trough. The sorting material trough includes a fixed support and several material boxes arranged in a preset direction.

[0008] In some embodiments, the visual inspection mechanism includes a three-axis support, an industrial camera, and a high-magnification lens; the industrial camera and the high-magnification lens are fixed on the three-axis support and the detection position and focus position are adjustable.

[0009] In some embodiments, the feeding wheel includes a first feeding wheel and a second feeding wheel assembled coaxially, and the material grooves on the first feeding wheel and the second feeding wheel are collinear; the discharge end of the feeding ramp adopts a toothed structure, including a plurality of protrusions and concave portions; the width of the concave portion can accommodate the first feeding wheel or the second feeding wheel to extend into it, and the width of the protrusion can extend between the first feeding wheel and the second feeding wheel.

[0010] Furthermore, the V-shaped bracket is provided with a concave space that runs through both sides, one side for the positioning clamping assembly or clamping device to extend into, and the other side to accommodate the first feeding wheel or the second feeding wheel to extend into.

[0011] In some embodiments, the positioning clamping assembly includes a positioning gripper, a first positioning cylinder, and a second positioning cylinder; the positioning gripper is located at the output end of the first positioning cylinder, the first positioning cylinder is located at the top end of the piston rod of the second positioning cylinder, and the second positioning cylinder is located on the side of the V-shaped bracket; the clamping device includes a sorting gripper, a first clamping cylinder, a second clamping cylinder, a linear module, and a drive motor; the sorting gripper is located at the output end of the first clamping cylinder, the first clamping cylinder is located at the bottom end of the piston rod of the second clamping cylinder, the second clamping cylinder is vertically mounted on the slider of the linear module, and the linear module is driven by the drive motor.

[0012] Furthermore, the sorting gripper gripping surface is provided with an arc-shaped groove adapted to needle-shaped materials.

[0013] Furthermore, the positioning gripper and the sorting gripper are both made of nylon; the first positioning cylinder and the first gripping cylinder are both finger cylinders; and the second positioning cylinder and the second gripping cylinder are both double-cylinder cylinders.

[0014] In some embodiments, the positioning mechanism further includes a sensor disposed at the bottom of the V-shaped bracket for detecting whether the material has reached the positioning position.

[0015] In some embodiments, the elastic structure is a spring or rubber.

[0016] Compared with the prior art, the utility model has the following beneficial effects: The needle tip size detection device provided by this utility model adopts a marble tabletop and a metal tabletop arranged separately. The vision inspection mechanism is independently installed on the marble tabletop, which can isolate the vibration interference of the moving mechanism on the metal tabletop and ensure the accuracy of needle tip detection. The feeding, positioning and sorting mechanisms are arranged sequentially along the material conveying direction on the metal tabletop to form a fully automated operation, avoiding the subjective error and efficiency limitations of manual inspection, and greatly improving the overall operation efficiency.

[0017] In particular, the feeding mechanism uses a coaxially assembled feeding wheel in conjunction with a feeding ramp with a toothed discharge structure to ensure that the material enters the trough accurately and the needle tips face the same direction, which solves the problem that existing vibratory feeders cannot distinguish between the needle tips and tails and that the material posture is chaotic.

[0018] In the positioning mechanism, the front positioning cylinder adopts a rigid structure to ensure a consistent needle tip detection reference, while the rear positioning cylinder is equipped with a spring or rubber elastic structure to accommodate materials with slight length deviations and prevent damage.

[0019] Furthermore, both the positioning gripper and the sorting gripper are made of nylon and are driven by a dual-cylinder cylinder in conjunction with a finger cylinder. This ensures stable and precise gripping while preventing scratches on the material surface, thus solving the problems of poor adaptability and damage to easily damaged materials in existing positioning mechanisms. The sorting gripper's gripping surface also features an arc-shaped groove, further ensuring stable material handling.

[0020] In summary, the needle tip size detection equipment achieves full automation of the entire process of precision needle electrode materials, from automatic feeding, precise positioning, high-precision detection to grading and sorting. It improves efficiency while ensuring detection accuracy and material integrity, and meets the needs of engineering mass production. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the main structure of the needle tip size detection device provided by this utility model; Figure 2 Rear perspective view of the needle tip size detection device provided by this utility model; Figure 3 A front perspective view of the needle tip size detection device provided by this utility model; Figure 4 Enlarged view of point A in the front perspective perspective of the needle tip size detection device provided by this utility model; Figure 5 A schematic diagram of the feeding mechanism provided by this utility model; Figure 6 Schematic diagram of the feeding mechanism and positioning mechanism provided by this utility model; Figure 7 A schematic diagram of the sorting mechanism provided by this utility model.

[0023] Figure label: 110 - Marble countertop; 120 - Metal countertop; 200 - Vision inspection mechanism; 210 - Three-axis support; 220 - Industrial camera; 230 - High-magnification lens; 300 - Feeding mechanism; 310 - Feeding ramp; 311 - Protrusion; 312 - Recess; 320 - Feeding roller; 320a - First feeding roller; 320b - Second feeding roller; 321 - Material trough; 400 - Positioning mechanism; 410 - V-shaped support; 411 - Receiving part; 412 - Abutment part; 420 - Front positioning cylinder; 430 - Rear positioning cylinder; 440 - Positioning clamping assembly; 441 - Positioning gripper; 442a - First positioning cylinder; 442b - Second positioning cylinder; 500 - Sorting mechanism; 510 - Gripping device; 511 - Sorting gripper; 512a - First gripping cylinder; 512b - Second gripping cylinder; 513 - Linear module; 514 - Drive motor; 520 - Sorting material trough; 521 - Fixed bracket; 522 - Material box. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "upper," "lower," "front," "rear," "top," "bottom," and "between," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] This utility model provides a needle tip size detection device for the automated detection and sorting of coarse-ground products of precision needle-shaped electrode materials. (See reference...) Figures 1-3 As shown, the system includes a marble countertop 110 and a metal countertop 120, which are independently configured to achieve functional zoning. A vision inspection mechanism 200 is fixedly installed on the marble countertop 110. By isolating it from the motion mechanism on the metal countertop 120, vibrations generated during the operation of moving parts can be effectively prevented from being transmitted to the vision inspection mechanism 200, ensuring that the inspection accuracy is not affected. A feeding mechanism 300, a positioning mechanism 400, and a sorting mechanism 500 are sequentially assembled on the metal countertop 120 along the material conveying direction. The mechanisms work together to complete the entire process of material feeding, positioning, inspection, and sorting.

[0027] See Figure 4 As shown, the feeding mechanism 300 includes a feeding ramp 310 and a feeding wheel 320. The feeding wheel 320 is driven to rotate by a power device, and a plurality of material grooves 321 parallel to the axial direction are opened on its surface. The size of the material grooves 321 is adapted to the needle-shaped material to be tested, which can ensure stable material bearing.

[0028] For the better option, please refer to [reference needed]. Figure 5 As shown, the feeding wheel 320 adopts a coaxially assembled first feeding wheel 320a and second feeding wheel 320b structure, and the material troughs 321 of the two are kept on the same axis, jointly bearing one piece of material, which facilitates stable material reception and unloading and improves the continuity of material transmission.

[0029] The feeding ramp 310 is inclinedly disposed at the material-taking end of the feeding wheel 320, and its material output end adopts a toothed structure, including several alternately distributed protrusions 311 and concave portions 312. The width of the concave portion 312 is adapted to the axial height of the first feeding wheel 320a or the second feeding wheel 320b, allowing a single feeding wheel portion to extend into it. The width of the protrusion 311 matches the gap between the first feeding wheel 320a and the second feeding wheel 320b, allowing it to extend between the two feeding wheels. This design allows the feeding ramp 310 and the feeding wheel 320 to interlock, ensuring that the material accurately enters the trough 321 when it rolls down by gravity, preventing it from escaping due to unavoidable gaps in mechanical assembly. It also ensures that the needle tips uniformly face the sidewall, avoiding material misalignment and laying the foundation for subsequent positioning and detection.

[0030] The positioning mechanism 400 is located at the discharge end of the feeding mechanism 300 and includes a V-shaped bracket 410, a front positioning cylinder 420, a rear positioning cylinder 430, a positioning clamping assembly 440, and a sensor. The V-shaped bracket 410 has a concave space extending through both sides. One side allows the positioning clamping assembly 440 or the gripping device 510 to extend into it for operation, while the other side can accommodate the first feeding wheel 320a or the second feeding wheel 320b to extend into it for unloading, thus realizing the connection between feeding and positioning.

[0031] The V-shaped bracket 410 includes a receiving part 411 and an abutment part 412. The top of the receiving part 411 corresponds to the material trough 321 of the feeding wheel 320, facilitating the material to roll from the trough 321 to the receiving part 411 and continue sliding to the bottom, where it is then abutted and fixed by the abutment part 412. The sensor is installed at the bottom of the V-shaped bracket 410 to detect in real time whether the material has reached the designated positioning position. When the material is detected to be in position, a signal is immediately sent to control the power unit of the feeding wheel 320 to stop working, avoiding interference caused by the continuous conveying of subsequent materials.

[0032] See Figure 6 As shown, the front positioning cylinder 420 and the rear positioning cylinder 430 are symmetrically arranged on both sides of the V-shaped bracket 410. The front positioning cylinder 420 adopts a rigid fixed structure, which can accurately abut against the tip of the material needle after extending, ensuring that the needle tip is in a fixed detection position after positioning and ensuring the consistency of the detection benchmark. The rear positioning cylinder 430 is equipped with an elastic structure, which is a spring or rubber. After extending, it abuts against the tail end of the material needle, which can adapt to needle-shaped materials with slight deviations in length, and avoid material damage caused by rigid compression.

[0033] The positioning clamping assembly 440 includes a positioning gripper 441, a first positioning cylinder 442a, and a second positioning cylinder 442b. The second positioning cylinder 442b is fixed to the side of the V-shaped bracket 410, and the first positioning cylinder 442a is installed at the top of its piston rod. The first positioning cylinder 442a is a finger cylinder, and the positioning gripper 441 is assembled at its output end.

[0034] In specific operation, after the front and rear positioning cylinders complete the positioning, the second positioning cylinder 442b (double cylinder) drives the first positioning cylinder 442a to extend towards the material. Then, the first positioning cylinder 442a (finger cylinder) drives the positioning gripper 441 to clamp the material needle rod. After clamping is completed, the front and rear positioning cylinders 420 and 430 retract, and the needle tip size is detected by the vision inspection mechanism 200.

[0035] Preferably, the positioning gripper 441 is made of nylon material, which can effectively prevent scratching the surface of the material during the gripping process; at the same time, the design of the double cylinder and the finger cylinder working together can ensure the stability and accuracy of the gripping action.

[0036] The vision inspection mechanism 200 includes a three-axis support 210, an industrial camera 220, and a high-magnification lens 230. The industrial camera 220 and the high-magnification lens 230 are fixedly mounted on the three-axis support 210. By manually adjusting the three-axis support 210, the positions of the industrial camera 220 and the high-magnification lens 230 in the X, Y, and Z axis directions can be finely adjusted, thereby accurately focusing on the needle tip of the material.

[0037] In actual operation, after the positioning mechanism 400 completes the material clamping and sends the detection signal, the industrial camera 220, together with the high-magnification lens 230, takes pictures and samples the needle tip. The needle tip size data is obtained through image analysis. The combination design of the high-magnification lens 230 and the adjustable three-axis support 210 can meet the detection requirements of different precision and improve the accuracy of the detection data.

[0038] The sorting mechanism 500 is located at the discharge end of the positioning mechanism 400, see reference. Figure 7 As shown, the device includes a gripping device 510 and a sorting material trough 520, used to classify and sort materials according to the detection results of the vision inspection mechanism 200. The gripping device 510 includes a sorting gripper 511, a first gripping cylinder 512a, a second gripping cylinder 512b, a linear module 513, and a drive motor 514. The linear module 513 is fixed on the metal table 120 and is driven by the drive motor 514 to realize the linear reciprocating motion of the slider; the second gripping cylinder 512b (double cylinder) is vertically mounted on the slider of the linear module 513, and the bottom end of its piston rod is connected to the first gripping cylinder 512a (finger cylinder), and the sorting gripper 511 is installed at the output end of the first gripping cylinder 512a.

[0039] Preferably, the sorting gripper 511 is made of nylon and its gripping surface is provided with an arc-shaped groove adapted to needle-shaped materials, which can enhance the stability of gripping and avoid damage to the materials.

[0040] The sorting material trough 520 includes a fixed support 521 and several material boxes 522. The material boxes 522 are arranged sequentially along the movement direction of the linear module 513, and the material boxes 522 can be individually removed from the fixed support 521 for convenient subsequent material collection and transfer.

[0041] After the vision inspection mechanism 200 outputs the inspection result, the drive motor 514 drives the linear module 513 to move the gripping device 510 to the positioning mechanism 400. The height is adjusted by the second gripping cylinder 512b, and the first gripping cylinder 512a drives the sorting claw 511 to grip the material. Then the linear module 513 moves the material to the material box 522 of the corresponding size grade, and the material is released to complete the sorting.

[0042] The method of using the needle tip size detection equipment of this utility model is as follows: First, the precision needle-shaped material to be detected is piled on the feeding ramp 310 with the needle tip facing the side wall. The material rolls down into the material trough 321 of the feeding wheel 320 by gravity and is then transported by the feeding wheel 320 to the V-shaped bracket 410 of the positioning mechanism 400. After the material triggers the sensor, the front positioning cylinder 420 and the rear positioning cylinder 430 extend to position, and the positioning clamping assembly 440 clamps the material. Then, the vision inspection mechanism 200 takes pictures of the needle tip through the industrial camera 220 and the high-magnification lens 230. After the inspection is completed, the clamping device 511 of the sorting mechanism 500 clamps the material and transports it to the corresponding material box 522 according to the inspection result, completing a single inspection and sorting operation. Repeating the above process can realize mechanized, continuous and automated inspection and sorting.

[0043] Although this article uses a lot of terms such as marble countertop, metal countertop, vision inspection mechanism, three-axis support, industrial camera, high-magnification lens, feeding mechanism, feeding ramp, feeding wheel, first feeding wheel, second feeding wheel, material trough, positioning mechanism, V-bracket, receiving part, abutment part, front positioning cylinder, rear positioning cylinder, positioning clamping assembly, positioning gripper, first positioning cylinder, second positioning cylinder, sensor, sorting mechanism, gripping device, sorting gripper, first gripping cylinder, second gripping cylinder, linear module, drive motor, sorting material trough, fixed bracket, material box, needle tip size, length, width size, nylon, spring, rubber, finger cylinder, double cylinder, power unit, coaxial assembly, tilt setting, fixed installation, rigid fixation, elastic structure configuration, clamping, photographic sampling, image analysis, linear reciprocating motion, graded sorting, individual removal, continuous operation, automated detection and sorting, isolated arrangement, staggered docking, precise focusing, and abutment fixation, the possibility of using other terms cannot be excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would be contrary to the spirit of this utility model.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A needle tip size detection device, characterized in that: It includes a marble countertop (110) and a metal countertop (120) arranged separately. The marble countertop (110) is provided with a vision inspection mechanism (200), and the metal countertop (120) is provided with a feeding mechanism (300) and a positioning mechanism (400) in sequence along the material conveying direction. The feeding mechanism (300) includes a feeding ramp (310) and a feeding wheel (320); the surface of the feeding wheel (320) is provided with a plurality of material grooves (321) parallel to the axial direction; the feeding ramp (310) is inclinedly arranged at the material picking end of the feeding wheel (320), and the material output end of the feeding ramp (310) corresponds to the material groove (321); The positioning mechanism (400) is located at the discharge end of the feeding mechanism (300) and includes a V-shaped bracket (410), a front positioning cylinder (420), a rear positioning cylinder (430), and a positioning clamping assembly (440). The V-shaped bracket (410) includes a receiving part (411) and an abutment part (412), with the top of the receiving part (411) corresponding to the material trough (321). The front positioning cylinder (420) and the rear positioning cylinder (430) are respectively located on both sides of the V-shaped bracket (410). The front positioning cylinder (420) is a rigid structure that can fix the position of the needle tip of the positioning material, and the rear positioning cylinder (430) is equipped with an elastic structure that can adapt to materials with slight deviations in length.

2. The needle tip size detection device according to claim 1, characterized in that: It also includes a sorting mechanism (500) located at the discharge end of the positioning mechanism (400). The sorting mechanism (500) includes a gripping device (510) and a sorting material trough (520). The sorting material trough (520) includes a fixed bracket (521) and a plurality of material boxes (522) arranged in a preset direction.

3. The needle tip size detection device according to claim 1, characterized in that: The visual inspection mechanism (200) includes a three-axis support (210), an industrial camera (220), and a high-magnification lens (230); the industrial camera (220) and the high-magnification lens (230) are fixed on the three-axis support (210) and the inspection position and focus position can be adjusted.

4. The needle tip size detection device according to claim 1, characterized in that: The feeding wheel (320) includes a first feeding wheel (320a) and a second feeding wheel (320b) assembled coaxially, and the material grooves (321) on the first feeding wheel (320a) and the second feeding wheel (320b) are collinear; The discharge end of the feeding ramp (310) adopts a toothed structure, including several protrusions (311) and concave portions (312); the width of the concave portion (312) can accommodate the first feeding wheel (320a) or the second feeding wheel (320b) to extend into it, and the width of the protrusion (311) can extend between the first feeding wheel (320a) and the second feeding wheel (320b).

5. The needle tip size detection device according to claim 4, characterized in that: The V-shaped bracket (410) has a concave space that runs through both sides. One side allows the positioning clamping assembly (440) or clamping device (510) to extend into, and the other side accommodates the first feeding wheel (320a) or the second feeding wheel (320b) to extend into.

6. The needle tip size detection device according to claim 2, characterized in that: The positioning clamping assembly (440) includes a positioning gripper (441), a first positioning cylinder (442a), and a second positioning cylinder (442b); the positioning gripper (441) is located at the output end of the first positioning cylinder (442a), the first positioning cylinder (442a) is located at the top of the piston rod of the second positioning cylinder (442b), and the second positioning cylinder (442b) is located on the side of the V-shaped bracket; The gripping device (510) includes a sorting gripper (511), a first gripping cylinder (512a), a second gripping cylinder (512b), a linear module (513), and a drive motor (514). The sorting gripper (511) is located at the output end of the first gripping cylinder (512a), the first gripping cylinder (512a) is located at the bottom end of the piston rod of the second gripping cylinder (512b), the second gripping cylinder (512b) is vertically located on the slider of the linear module (513), and the linear module (513) is driven by the drive motor (514).

7. The needle tip size detection device according to claim 6, characterized in that: The sorting gripper (511) has an arc-shaped groove on its gripping surface that is adapted to needle-shaped materials.

8. The needle tip size detection device according to claim 6, characterized in that: The positioning gripper (441) and sorting gripper (511) are both made of nylon. Both the first positioning cylinder (442a) and the first gripping cylinder (512a) are finger cylinders; The second positioning cylinder (442b) and the second clamping cylinder (512b) are both double-cylinder cylinders.

9. The needle tip size detection device according to claim 1, characterized in that: The positioning mechanism (400) also includes a sensor located at the bottom of the V-shaped bracket (410) for detecting whether the material has reached the positioning position.

10. The needle tip size detection device according to claim 1, characterized in that: The elastic structure is a spring or rubber.

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