Metal capillary tube cutter

Abstract

The utility model relates to the field of metal capillary tube cutting, in particular to a metal capillary tube cutter which comprises a cutting sleeve, a blade, an ejector pin, a compression spring and the like, and a conical pressing part of the ejector pin abuts against a metal capillary tube through spring pressure. Precise cutting of small pipelines is achieved, and the cutting efficiency and the cutting quality are improved. Meanwhile, due to the design that knurling anti-skid lines, a tool clamping plane and an observation window are additionally arranged, using convenience and comfort are improved. The cut metal capillary tube is free of burrs on the section, high in roundness and capable of being directly used for occasions with high requirements such as a high-water-pressure system. Besides, the cutter further has the advantages of being compact in structure, easy and convenient to operate, high in adaptability and the like, can be widely applied to the field of precise instruments such as medical instruments, electronic elements, laboratory scientific research and liquid chromatography, and provides an efficient and reliable solution for cutting of small pipelines.

Description

Technical Field

[0001] This application relates to the field of metal capillary cutting, and particularly to a metal capillary cutter. Background Art

[0002] Metal capillary cutters are widely used in precision instrument fields such as medical devices, electronic components, laboratory research, and liquid chromatography. These fields have extremely strict requirements for cutting accuracy to ensure the performance and accuracy of the final products. Especially in liquid chromatography systems, as a key component, the cutting quality of metal capillaries directly affects the separation efficiency and detection sensitivity of the system.

[0003] Currently, traditional cutters on the market are mainly suitable for cutting pipelines with a diameter exceeding 3 mm. These cutters have certain limitations in design and function and are difficult to meet the cutting requirements of small pipelines. For pipelines with a diameter less than 3 mm, especially liquid pipelines (outer diameter 1.6 mm, inner diameter between 0 and 1.0 mm, and relatively thick wall), traditional cutters are often difficult to effectively cut.

[0004] Due to the small outer diameter, even smaller inner diameter, and relatively thick wall of liquid pipelines, traditional cutters are difficult to accurately cut. In addition, there is also a problem in the cutting process of traditional cutters, that is, metal capillaries are prone to falling off from the cutter, resulting in the need to realign the cutting position, which not only affects the cutting efficiency but also may reduce the cutting surface effect. The falling off of metal capillaries also requires the operator to realign the cutting position, which not only reduces the cutting efficiency but also may lead to poor cutting surface effect due to inaccurate repeated positioning. Summary of the Utility Model

[0005] To solve the problem that in the cutting process of existing cutters, metal capillaries are prone to falling off from the cutter, and after falling off, the cutting position needs to be realigned, which affects the cutting efficiency and the cutting surface effect.

[0006] This application provides a metal capillary cutter, including: a cutting sleeve, a blade, a thimble, a spring, and a hand-tightening nut;

[0007] The cutting sleeve is of a cylindrical structure, and a blade mounting hole is provided at the lower end of the cutting sleeve, which is radially arranged and penetrates both sides of the cutting sleeve;

[0008] An axially arranged cutting groove is provided in the middle of the cutting sleeve, which penetrates the blade mounting hole;

[0009] The blade is arranged in the blade mounting hole, and the cutting edge of the blade extends towards the direction of the cutting groove, and the cutting edge is higher than one side of the cutting groove;

[0010] The inside of the cutting sleeve is provided with a central hole, and the central hole extends from one end far away from the blade mounting hole to the position of the cutting groove;

[0011] The thimble is axially movably arranged in the central hole, and the lower end of the thimble contacts the cutting edge of the blade;

[0012] The hand-tightening nut is movably connected to one end of the cutting sleeve with the central hole;

[0013] One end of the spring contacts the hand-tightening nut, and the other end abuts against the upper end of the thimble, for providing continuous downward pressure to the thimble.

[0014] In a feasible implementation manner, the first end of the central hole has internal threads, the hand-tightening nut has external threads, and the hand-tightening nut is threadedly connected to the first end of the central hole.

[0015] In a feasible implementation manner, the thimble is provided with a guiding protrusion, and one end of the spring is sleeved on the outer periphery of the guiding protrusion;

[0016] One end of the hand-tightening nut screwed into the central hole has a compression hole, and the other end of the spring is arranged in the compression hole and contacts the bottom surface of the compression hole.

[0017] In a feasible implementation manner, the cutting sleeve has a bearing hole at the position centered with the blade mounting hole;

[0018] A bearing is arranged in the bearing hole, and the blade is rotatably mounted in the blade mounting hole through the bearing.

[0019] In a feasible implementation manner, the end of the bearing far away from the blade mounting hole has a fixing screw.

[0020] In a feasible implementation manner, the lower end of the thimble is provided with a conical pressing part;

[0021] The diameter of the bottom end of the conical pressing part of the thimble is smaller than the outer diameter of the metal capillary to be cut, and the inclination angle of the conical surface of the conical pressing part is 30-60°.

[0022] In a feasible implementation manner, an observation window is provided at a position on the side wall of the cutting sleeve at the same height as the cutting groove, the observation window communicates with the cutting groove, and the diameter of the observation window is larger than the width of the cutting groove.

[0023] In a feasible implementation manner, at least two tool clamping planes are provided on the outer surface of the cutting sleeve and are arranged in parallel, and the tool clamping planes are located at one end far away from the hand-tightening nut.

[0024] In a feasible implementation, the cutting edge of the blade is arc-shaped, and the ratio of its curvature radius to the outer diameter of the metal capillary to be cut is 1.2 - 1.5:1.

[0025] In a feasible implementation, the outer surface of the hand-tightening nut is provided with knurled anti-slip threads.

[0026] This application provides a metal capillary cutter. By arranging a blade, a thimble and a compression spring inside the cutting sleeve, the conical pressing part can hold the metal capillary, achieving precise cutting of thin pipelines, improving the cutting efficiency and quality. At the same time, through the designs of adding knurled anti-slip threads, a tool clamping plane and an observation window, the convenience and comfort of use are improved. The cut surface of the metal capillary after cutting has no burrs and high roundness, and can be directly used in occasions with high requirements such as high water pressure systems. In addition, the cutter also has the advantages of compact structure, simple operation and strong adaptability, and can be widely applied in the fields of medical devices, electronic components, laboratory research and development, and precision instruments such as liquid chromatography, providing an efficient and reliable solution for the cutting of thin pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings here are incorporated into the specification and constitute a part of this specification, showing the embodiments in line with the implementation of the present utility model, and are used together with the specification to explain the principles of the embodiments of the present utility model. Obviously, the drawings in the following description are only some embodiments of the implementation of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 is an exploded structural schematic diagram of the metal capillary cutter shown in an exemplary embodiment of this application;

[0029] Figure 2 is a sectional structural schematic diagram of the metal capillary cutter shown in an exemplary embodiment of this application;

[0030] Figure 3 is a usage schematic diagram of the metal capillary cutter shown in an exemplary embodiment of this application;

[0031] Figure 4 is a back structural schematic diagram of the metal capillary cutter shown in an exemplary embodiment of this application.

[0032] LABEL DESCRIPTION OF THE DRAWINGS:

[0033] 100 - Cutting sleeve; 200 - Blade; 300 - Thimble; 400 - Spring; 500 - Hand - tightened nut; 600 - Bearing; 700 - Fixing screw; 110 - Blade mounting hole; 120 - Cutting groove; 130 - Central hole; 140 - Bearing hole; 150 - Observation window; 210 - Cutting edge; 310 - Conical pressing part; 320 - Guide projection; 510 - Compression hole. Detailed implementation manners

[0034] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present invention.

[0035] Conventional cutters are mainly applicable to cutting pipelines with a diameter of more than 3 mm. For pipelines with a diameter of less than 3 mm, especially liquid - phase pipelines (outer diameter 1.6 mm, inner diameter between 0 and 1.0 mm, and relatively thick wall), conventional cutters are often difficult to cut effectively. Due to the small outer diameter, even smaller inner diameter, and relatively thick wall of liquid - phase pipelines, conventional cutters are difficult to cut accurately. At the same time, during the cutting process, metal capillary tubes are likely to fall out of the cutter, which requires the operator to realign the cutting position. This not only reduces the cutting efficiency but also may result in poor cutting surface quality due to inaccurate repeated positioning. Therefore, metal capillary tubes are likely to fall out of the cutter, leading to the need to realign the cutting position, which not only affects the cutting efficiency but also may reduce the cutting surface quality.

[0036] To solve the above problems, referring to Figures 1-4 as shown, the present application provides a metal capillary cutter, comprising: a cutting sleeve 100, a blade 200, a thimble 300, a spring 400, and a hand - tightened nut 500.

[0037] The cutting sleeve 100 is of a cylindrical structure, and a blade mounting hole 110 that is radially arranged and penetrates both sides is provided at the lower end; the blade 200 is arranged in the blade mounting hole 110, and the cutting edge 210 extends towards the cutting groove 120; the thimble 300 is axially movably arranged in the central hole 130, and the lower end contacts the cutting edge 210 of the blade 200; the hand - tightened nut 500 is movably connected to the end of the cutting sleeve 100 having the central hole 130; one end of the spring 400 contacts the hand - tightened nut 500, and the other end abuts against the upper end of the thimble 300.

[0038] Among them, the cutting sleeve 100 serves as the main load-bearing structure for carrying and connecting various components; the blade 200 is responsible for cutting the metal capillary; under the action of the spring 400, the thimble 300 continuously presses against the metal capillary to ensure that the blade 200 is in close contact with the metal capillary during the cutting process; the hand-tightening nut 500 is used to adjust the compression amount of the spring 400, thereby controlling the pressure of the thimble 300 on the metal capillary; the spring 400 provides continuous pressure. After pressing the thimble 300, it can further press the metal capillary to ensure the stability of the cutting process.

[0039] During use, rotate the hand-tightening nut 500. Through screw drive, adjust the position of the hand-tightening nut 500 in the central hole 130, thereby changing the compression amount of the spring 400. After the spring 400 is compressed, it transmits the pressure to the thimble 300, causing the thimble 300 to continuously press against the metal capillary. At the same time, the blade 200 rotates during the cutting process to cut the metal capillary. The cutting sleeve 100, as an overall structure, supports and connects various components to ensure the stability of the cutting process.

[0040] This embodiment solves the problems that conventional cutters in the market are difficult to cut pipelines with a diameter of less than 3 mm, and the metal capillary is likely to fall off from the cutter during the cutting process, affecting the cutting efficiency and the cutting surface effect. By rotating the blade 200 to scratch around the metal capillary and combining the spring 400 and thimble 300 structures, effective cutting of thin pipelines is achieved. The pressure of the spring 400 ensures close contact between the thimble 300 and the metal capillary, preventing it from falling off, thereby ensuring the accuracy of the cutting position. This structure enables the cutter to accurately cut thin pipelines, improving the cutting efficiency and cutting quality; at the same time, ensuring the stability of the cutting process, reducing the risk of the metal capillary falling off, and reducing the need to repeatedly align the cutting position.

[0041] In some embodiments of the present application, the first end of the central hole 130 has internal threads, and the hand-tightening nut 500 has external threads. The hand-tightening nut 500 is threadedly connected to the first end of the central hole 130. Through the threaded connection between the hand-tightening nut 500 and the cutting sleeve 100, it is convenient to adjust the pressure of the spring 400.

[0042] During use, rotate the hand-tightening nut 500. Through screw drive, adjust the position of the hand-tightening nut 500 at the first end of the central hole 130, thereby changing the compression amount of the spring 400, and then adjusting the pressure of the thimble 300 on the metal capillary. This connection method can simply and effectively adjust the pressure of the spring 400 to meet the cutting requirements of metal capillaries with different diameters and materials. At the same time, by utilizing the self-locking and adjustable properties of the threaded connection, precise adjustment of the spring 400 pressure is achieved to ensure that the thimble 300 applies appropriate pressure to the metal capillary.

[0043] It is convenient for users to adjust the pressure of the spring 400 according to actual needs, improving the adaptability and usability of the cutter. Moreover, precise pressure adjustment helps ensure cutting quality and efficiency, avoiding cutting problems caused by excessive or insufficient pressure.

[0044] In some embodiments of the present application, the ejector pin 300 is provided with a guiding protrusion 320, and one end of the spring 400 is sleeved on the outer periphery of the guiding protrusion 320; one end of the hand-tightening nut 500 screwed into the central hole 130 has a compression hole 510, and the other end of the spring 400 is arranged in the compression hole 510 and contacts the bottom surface of the compression hole 510.

[0045] The guiding protrusion 320 is used to guide the compression direction of the spring 400, ensuring that the pressure of the spring 400 is accurately transmitted to the ejector pin 300 along the axial direction; the compression hole 510 is used to accommodate the spring 400 and transmit pressure. When the hand-tightening nut 500 is rotated, the bottom surface of the compression hole 510 pushes the spring 400 to compress, and the spring 400 transmits the pressure to the ejector pin 300 through the guiding protrusion 320, making the ejector pin 300 continuously press against the metal capillary tube. To ensure that the pressure of the spring 400 can be accurately transmitted to the ejector pin 300, avoiding pressure deviation or loss.

[0046] In this embodiment, through the cooperation of the guiding protrusion 320 and the compression hole 510, it is ensured that the pressure of the spring 400 is accurately transmitted to the ejector pin 300 along the axial direction, improving the efficiency and accuracy of pressure transmission, ensuring that the ejector pin 300 can continuously and stably press against the metal capillary tube; reducing pressure deviation or loss, improving the stability and reliability of the cutter, thereby ensuring cutting quality.

[0047] In some embodiments of the present application, the cutting sleeve 100 has a bearing hole 140 at the position centered on the blade mounting hole 110; a bearing 600 is provided in the bearing hole 140, and the blade 200 is rotatably mounted in the blade mounting hole 110 through the bearing 600. The bearing hole 140 is used for mounting the bearing 600; the bearing 600 is used for supporting the blade 200 and reducing rotational friction.

[0048] The blade 200 rotates around the bearing 600 during cutting, and the bearing 600 reduces the friction between the blade 200 and the cutting sleeve 100, improving the rotation efficiency of the blade 200.

[0049] In the existing cutter, the blade 200 rotates not smoothly during cutting, affecting the cutting efficiency. At the same time, the friction between the blade 200 and the cutting sleeve 100 causes wear and heat generation. This embodiment utilizes the rolling friction characteristic of the bearing 600 to reduce the friction between the blade 200 and the cutting sleeve 100, improving the rotation efficiency of the blade 200, thereby improving the cutting efficiency; further reducing the wear and heat generation between the blade 200 and the cutting sleeve 100, extending the service life of the cutter, and reducing the maintenance cost.

[0050] In some embodiments of the present application, one end of the bearing 600 away from the blade mounting hole 110 has a fixing screw 700. The fixing screw 700 is used to fix the position of the bearing 600 and prevent its axial movement.

[0051] During the installation process, the bearing 600 is fastened in the bearing hole 140 by the fixing screw 700 to ensure the stability and accuracy of the bearing 600. During the cutting process, the fixing screw 700 prevents the bearing 600 from moving axially and ensures the rotational accuracy of the blade 200.

[0052] Conventional bearings 600 may move axially during the cutting process, affecting the rotational accuracy of the blade 200 and the cutting quality. In this embodiment, through the fastening effect of the fixing screw 700, the bearing 600 is prevented from moving axially during the cutting process, ensuring the rotational accuracy of the blade 200 and the cutting quality, reducing the risk of axial movement of the bearing 600, prolonging the service life of the cutter, and improving the overall performance of the cutter.

[0053] In some embodiments of the present application, the lower end of the ejector pin 300 is provided with a conical pressing part 310; the diameter of the bottom end of the conical pressing part 310 is smaller than the outer diameter of the metal capillary to be cut, and the inclination angle of the conical surface is 30 - 60°. The design of the inclination angle of the conical surface helps to better insert the metal capillary into the cutter.

[0054] Specifically, the inclination angle is set between 30° and 60° to minimize the insertion resistance while ensuring sufficient stability. For example, when the inclination angle is 30°, the metal capillary can slide smoothly along the conical surface, reducing the friction and resistance caused by too large an angle and making the insertion process smoother. When the inclination angle is 60°, although there is slightly greater resistance compared to 30°, the contact area between the conical surface and the metal capillary is larger at this time, providing better stability and fixing effect to ensure that the metal capillary does not affect the cutting accuracy due to shaking or misalignment during the cutting process.

[0055] When cutting the metal capillary, first align one end of the metal capillary with the conical surface of the conical pressing part 310 and push the metal capillary. Due to the design of the inclination angle of the conical surface, the metal capillary can slide smoothly along the conical surface until it is firmly fixed by the conical pressing part 310. At this time, the cutter can be started to perform the cutting operation on the metal capillary. This design not only improves the cutting accuracy but also greatly reduces the operation difficulty, making the cutting of the metal capillary simpler and faster.

[0056] In addition, the diameter of the bottom end of the conical pressing part 310 is smaller than the outer diameter of the metal capillary, ensuring that the metal capillary does not cause inaccurate cutting due to shaking or misalignment during the cutting process, further enhancing the stability and accuracy of the cutting.

[0057] In some embodiments of the present application, an observation window 150 is provided at a position on the side wall of the cutting sleeve 100 that is at the same height as the cutting groove 120; the observation window 150 is in communication with the cutting groove 120, and the diameter of the observation window 150 is greater than the width of the cutting groove 120. The observation window 150 is used to observe the cutting position to ensure accurate cutting.

[0058] During the cutting process, the cutting position is observed through the observation window 150, and the position or rotation angle of the cutter is adjusted according to the observation result to ensure accurate cutting.

[0059] During a conventional cutting process, it is difficult to align the cutting position, which will affect the cutting accuracy. In this embodiment, the observation window 150 provides a visual observation channel, facilitating the user to align the cutting position; the diameter of the observation window 150 is greater than the width of the cutting groove 120, which helps to expand the observation range, improve the alignment accuracy, reduce the cutting error, and reduce the difficulty of aligning the cutting position, improve the cutting efficiency, and reduce material waste.

[0060] In some embodiments of the present application, at least two parallel tool clamping planes 160 are provided on the outer surface of the cutting sleeve 100; the tool clamping planes 160 are located at one end away from the hand-tightening nut 500. The tool clamping planes 160 can be used to provide a clamping position for tools such as wrenches, facilitating the use by people with less strength.

[0061] When using a tool such as a wrench to clamp on the tool clamping plane 160, the rotation torque is increased through the lever principle to assist in rotating the cutting sleeve 100, enabling people with less strength to easily use the cutter. This improves the convenience of use, expands the application range of the cutter, improves the working efficiency, and enhances the practicality of the cutter.

[0062] In some embodiments of the present application, the cutting edge portion 210 of the blade 200 is arc-shaped, and the ratio of its curvature radius to the outer diameter of the metal capillary to be cut is between 1.2 and 1.5:1. The selection of this ratio range has a decisive influence on the cutting effect. For example, when the ratio is set to 1.2:1, the curvature radius of the cutting edge portion 210 is relatively small, which can closely fit the outer surface of the metal capillary to achieve fine and tight cutting, especially suitable for scenarios with relatively thin tube walls or requiring high-precision cuts. When the ratio is set to 1.5:1, the curvature radius of the cutting edge portion 210 is relatively large, providing a wider cutting surface, suitable for occasions with relatively thick tube walls or requiring a certain cutting width. The arc-shaped cutting edge portion 210 can make a uniform and consistent cut on the metal capillary.

[0063] Through the design of the arc-shaped cutting edge 210, the incision is made more uniform and smooth, reducing the subsequent polishing requirements; the design of the ratio of the radius of curvature to the outer diameter of the metal capillary to be cut not only helps to better adapt to the shape of the metal capillary, but also can be flexibly adjusted according to different wall thicknesses and cutting requirements, further improving the cutting quality. The cut surface of the metal capillary after cutting has no burrs and high roundness; it reduces the subsequent polishing requirements, improves work efficiency, and reduces production costs.

[0064] In some embodiments of the present application, the outer surface of the hand-tightening nut 500 is provided with knurled anti-slip patterns. The knurled anti-slip patterns are used to increase the friction of the hand-tightening nut 500 and improve the convenience of use. When rotating the hand-tightening nut 500, the friction between the knurled anti-slip patterns and the fingers increases, making the rotation easier and more labor-saving, improving work efficiency, and reducing operation fatigue.

[0065] According to the above content, when the metal capillary cutter provided by the present application is in use, first, insert the metal capillary into the cutting sleeve 100 and align the cutting position through the observation window 150; then, rotate the hand-tightening nut 500 to compress the spring 400, so that the conical pressing part 310 of the thimble 300 presses against the metal capillary; next, use tools such as a wrench to clamp on the tool clamping plane 160 to assist in rotating the cutting sleeve 100 and drive the blade 200 to rotate and cut the metal capillary. During the cutting process, observe the cutting situation through the observation window 150 to ensure accurate cutting; finally, after cutting is completed, loosen the hand-tightening nut 500 and take out the cut metal capillary.

[0066] The metal capillary cutter provided by the present application realizes that the conical pressing part presses against the metal capillary through the structure of arranging a blade, a thimble and a compression spring in the cutting sleeve. It achieves precise cutting of thin pipelines, improves cutting efficiency and cutting quality. At the same time, through the design of adding knurled anti-slip patterns, tool clamping planes and observation windows, the convenience and comfort of use are improved. The cut surface of the metal capillary after cutting has no burrs and high roundness, and can be directly used in occasions with higher requirements such as high water pressure systems. In addition, the cutter also has the advantages of compact structure, simple operation, strong adaptability, etc., and can be widely applied to precision instrument fields such as medical devices, electronic components, laboratory research, and liquid chromatography, providing an efficient and reliable solution for the cutting of thin pipelines.

[0067] After considering the disclosure of the specification and embodiments, those skilled in the art will readily think of other implementation schemes of the present disclosure. The present application aims to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure.

Claims

1. A metal capillary cutter, characterized in that, It includes a cutting sleeve (100), a blade (200), a thimble (300), a spring (400) and a hand-tightening nut (500); The cutting sleeve (100) is of a cylindrical structure, and a blade mounting hole (110) which is radially arranged and penetrates through both sides of the cutting sleeve (100) is provided at the lower end of the cutting sleeve (100); A cutting groove (120) which is axially arranged and penetrates through the blade mounting hole (110) is provided in the middle of the cutting sleeve (100); The blade (200) is arranged in the blade mounting hole (110), and the cutting edge part (210) of the blade (200) extends towards the direction of the cutting groove (120), and the cutting edge part (210) protrudes above one side of the cutting groove (120); A central hole (130) is provided inside the cutting sleeve (100), and the central hole (130) extends from one end far away from the blade mounting hole (110) to the position of the cutting groove (120); The thimble (300) is axially movably arranged in the central hole (130), and the lower end of the thimble (300) contacts the cutting edge part (210) of the blade (200); The hand-tightening nut (500) is movably connected to one end of the cutting sleeve (100) having the central hole (130); One end of the spring (400) contacts the hand-tightening nut (500), and the other end abuts against the upper end of the thimble (300) for providing continuous downward pressure to the thimble (300).

2. The metal capillary cutter according to claim 1, characterized in that, The first end of the central hole (130) has internal threads, the hand-tightening nut (500) has external threads, and the hand-tightening nut (500) is threadedly connected to the first end of the central hole (130).

3. The metal capillary cutter according to claim 1, characterized in that, A guiding protrusion (320) is provided on the thimble (300), and one end of the spring (400) is sleeved on the outer periphery of the guiding protrusion (320); One end of the hand-tightening nut (500) screwed into the central hole (130) has a compression hole (510), and the other end of the spring (400) is arranged in the compression hole (510) and contacts the bottom surface of the compression hole (510).

4. The metal capillary cutter according to claim 1, characterized in that, The cutting sleeve (100) has a bearing hole (140) at the position centered on the blade mounting hole (110); A bearing (600) is provided in the bearing hole (140), and the blade (200) is rotatably mounted in the blade mounting hole (110) through the bearing (600).

5. The metal capillary cutter according to claim 4, characterized in that, A fixing screw (700) is provided at one end of the bearing (600) far away from the blade mounting hole (110).

6. The metal capillary cutter according to claim 1, characterized in that, A conical pressing part (310) is provided at the lower end of the thimble (300); The diameter of the bottom end of the conical pressing part (310) of the thimble (300) is smaller than the outer diameter of the metal capillary to be cut, and the taper angle of the conical surface of the conical pressing part (310) is 30 - 60°.

7. The metal capillary cutter according to claim 1, characterized in that, An observation window (150) is provided on the side wall of the cutting sleeve (100) at the same height as the cutting groove (120), the observation window (150) communicates with the cutting groove (120), and the diameter of the observation window (150) is larger than the width of the cutting groove (120).

8. The metal capillary cutter according to claim 1, characterized in that, At least two tool clamping planes (160) arranged in parallel are provided on the outer surface of the cutting sleeve (100), and the tool clamping planes (160) are located at one end far from the hand-tightening nut (500).

9. The metal capillary cutter according to claim 1, wherein, The cutting edge portion (210) of the blade (200) is arc-shaped, and the ratio of its curvature radius to the outer diameter of the metal capillary tube to be cut is 1.2 - 1.5:

1.

10. The metal capillary cutter according to claim 1, characterized in that, Knurled anti-slip lines are provided on the outer surface of the hand-tightening nut (500).

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