Scissors for quartz capillary column

Abstract

The utility model discloses a special scissors of quartz capillary column, including mutually hinged first half body and second half body, both include knife head and handle, first half body knife head is equipped with a plurality of round type limit hole for fixing capillary column, and the second half body is equipped with the notch with cutting edge in correspondence to cooperate and cut. The arc track coincidence of the notch and the corresponding limit hole around the hinge when the scissors cut is formed, the cutting edge always sticks to the outer circle of the column, the maximum contact area, let the shearing force evenly distribute along the radial, avoid the column to break because of local excessive stress. At the same time, the notch design prolongs the cutting stroke, realizes continuous smooth cutting, effectively guarantees the flush of the cut. Convenient operation, high efficiency, need not special skill, friendly to the novice, can satisfy the rigorous requirement of the capillary column cut quality of the precision experiment, guarantee the follow -up chromatographic analysis effect.

Description

Technical Field

[0001] This utility model relates to the field of quartz capillary column technology, and in particular to a special scissor for quartz capillary columns. Background Technology

[0002] Quartz capillary columns are a commonly used core separation component in gas chromatography analysis. With their advantages of high separation efficiency, low activity, and good thermal stability, they are widely used in the analysis of complex samples in fields such as chemical engineering, environmental protection, food, and pharmaceuticals.

[0003] In the installation process of quartz capillary columns, cutting is a crucial preliminary step. To ensure a precise seal between the column and the chromatograph's injection port and detector, and to reduce sample adsorption and peak distortion, the cut must be flush. Currently, the mainstream cutting method involves manually breaking the column after making small incisions on the surface with a ceramic disc or file. This method requires strict operational skills and relies heavily on the operator's experience. If ordinary scissors are used, the column's high toughness and brittleness can easily lead to problems such as skewed cuts and burrs, as well as the risk of slippage, column breakage, or damage, directly affecting the accuracy of subsequent analytical results.

[0004] Therefore, a specialized cutting tool is needed that can ensure cutting efficiency while guaranteeing a clean cut and safe operation, meeting the high requirements of the laboratory for cutting quartz capillary columns. Utility Model Content

[0005] This invention provides a special scissor for quartz capillary columns to overcome the above-mentioned problems.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: A special scissor for quartz capillary columns includes a first half and a second half hinged to the first half. Both the first half and the second half include a cutting head and a handle connected to the cutting head. The cutting head of the first half is provided with a plurality of circular limiting holes for placing the quartz capillary column to be cut. The second half is provided with a plurality of notches that can cooperate with the circular limiting holes to cut the quartz capillary column. The inner edge of the notch is provided with a cutting edge for cutting the quartz capillary column. During shearing, the arc-shaped trajectory formed by the movement of the notch around the hinge of the first half and the second half coincides with the arc-shaped trajectory formed by the movement of the circular limiting hole around the hinge, which cooperates with the notch to perform shearing.

[0007] Furthermore, the notch includes a first arc-shaped portion and two second arc-shaped portions disposed on both sides of the first arc-shaped portion and connected thereto. The first arc-shaped portion is semi-circular arc-shaped, and its diameter is equal to the outer diameter of the quartz capillary column to be cut. The center of the first arc-shaped part and the center of the circular limiting hole that shears with it are both located on the same arc with the hinge point as the center. The two second arc-shaped portions coincide with the two circular arc-shaped motion trajectories formed by the movement of the two diameter endpoints on the first arc-shaped portion during shearing; The blade is provided on the sidewalls of both the first and second arc-shaped portions.

[0008] Furthermore, the inner diameter of the circular limiting hole is 0.1 mm larger than the outer diameter of the quartz capillary column to be sheared.

[0009] Furthermore, the diameters of the circular limiting holes are different, and the circular limiting holes of different diameters are arranged sequentially along the length direction of the cutter head of the first half.

[0010] Furthermore, the diameters of the first arc-shaped portions of the several notches are different, and the different notches of the several first arc-shaped portions with different diameters are arranged sequentially along the length direction of the cutter head of the second half.

[0011] Furthermore, the diameter of the first arc-shaped portion ranges from 0.25mm to 0.53mm.

[0012] Furthermore, the diameters of the first arc-shaped portions of the plurality of notches are 0.25 mm, 0.32 mm, and 0.53 mm, respectively.

[0013] Furthermore, the inner diameter of the circular limiting hole ranges from 0.26mm to 0.54mm.

[0014] Furthermore, the inner diameters of the plurality of circular limiting holes are 0.26 mm, 0.33 mm and 0.54 mm, respectively.

[0015] Furthermore, both the first half and the second half are provided with hinged threaded holes, and the first half and the second half are connected by screws passing through the hinged threaded holes.

[0016] The beneficial effects of this utility model are: This utility model discloses a special scissor for quartz capillary columns. A circular limiting hole ensures the stability of the quartz capillary column position during shearing. By designing the movement trajectory of the notch and the circular limiting hole to coincide in an arc, the blade remains in contact with the outer surface of the quartz capillary column throughout the shearing process. This maximizes the contact area between the blade and the capillary column, ensuring uniform radial distribution of shearing force and effectively preventing column breakage due to excessive localized stress, thus guaranteeing cutting efficiency. Simultaneously, the notch design extends the cutting stroke of the scissors on the capillary column, making the contact and cutting process between the blade and the column more continuous and stable, improving the cutting effect and further ensuring a clean cut. This meets the stringent requirements for capillary column cut quality in precision experimental operations, ensuring the analytical results of the chromatographic column. This special scissor is easy to operate and highly efficient. Attached Figure Description 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.

[0017] Figure 1 This is a schematic diagram of a special shear structure for quartz capillary columns disclosed in this utility model embodiment. Figure 1 (The first and second halves are not closed, i.e., the positions of the first and second halves before shearing are shown.) Figure 2 This is a schematic diagram of a special shear structure for quartz capillary columns disclosed in this utility model embodiment. Figure 2 (The circular dashed lines in the figure represent the movement trajectory of the notch and the circular limiting hole.) Figure 3 This is a schematic diagram of a special shear structure for quartz capillary columns disclosed in this utility model embodiment. Figure 3 (The first and second halves are closed, i.e., the positions of the first and second halves after cutting are shown). Figure 4 This is a schematic diagram of the structure of the second half of a special quartz capillary column scissor disclosed in an embodiment of the present invention; Figure 5 for Figure 4 Enlarged view of section A.

[0018] In the picture: 1. First half; 11. Circular limiting hole; 2. Second half; 21. Notch; 211. First arc-shaped part; 212. Second arc-shaped part; 22. Blade; 3. Blade head; 4. Handle; 5. Hinged threaded hole. Detailed Implementation

[0019] 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.

[0020] Example: like Figure 1-3 The image shows a special quartz capillary column shear provided in this embodiment, including a first half 1 and a second half 2 hinged to the first half 1. Both the first half 1 and the second half 2 include a blade head 3 and a handle 4 connected to the blade head 3. The blade head 3 of the first half 1 is provided with a plurality of circular limiting holes 11 for placing the quartz capillary column to be cut. The second half 2 is provided with a plurality of notches 21 that can cooperate with the circular limiting holes 11 to cut the quartz capillary column. The inner edge of the notch 21 is provided with a cutting edge 22 for cutting the quartz capillary column. During shearing, the arc-shaped trajectory formed by the notch 21 moving around the hinge of the first half 1 and the second half 2 coincides with the arc-shaped trajectory formed by the circular limiting hole 11 moving around the hinge in conjunction with the notch 21 (when in use, the cutting head contact plane of the first half 1 is in contact with the cutting head contact plane of the second half 2).

[0021] This utility model discloses a special scissor for quartz capillary columns. A circular limiting hole ensures the stability of the quartz capillary column position during shearing. By designing the movement trajectory of the notch and the circular limiting hole to coincide in an arc shape, and combining this with a sharp blade formed by grinding inside the notch, the blade remains in constant contact with the outer surface of the quartz capillary column during shearing. This maximizes the contact area between the blade and the capillary column, ensuring uniform radial distribution of shearing force and effectively preventing column breakage due to excessive localized stress, thus guaranteeing cutting efficiency. Furthermore, compared to a flat blade, the notch design extends the cutting stroke of the scissors on the capillary column and makes the contact and cutting process between the blade and the column more continuous and stable, ensuring a clean cut and further improving cutting efficiency. This meets the stringent requirements for capillary column cut quality in precision experimental operations, ensuring the analytical results of the chromatographic column. This special scissor is easy to operate, highly efficient, requires no special skills, and is beginner-friendly.

[0022] In a specific embodiment, such as Figure 4, Figure 5 As shown, the notch 21 includes a first arc-shaped portion 211 and two second arc-shaped portions 212 disposed on both sides of the first arc-shaped portion 211 and connected thereto. The first arc-shaped portion 211 is semi-circular arc-shaped, and its diameter is equal to the outer diameter of the quartz capillary column to be cut, so that the first arc-shaped portion can be completely fitted with the outer circular sidewall of the capillary column, ensuring that the force points of the blade 22 and the column are evenly distributed when the shearing is initially contacted, and avoiding the column from cracking due to local stress concentration. The center of the first arc-shaped part 211 and the center of the circular limiting hole that shears with it are both located on the same arc with the hinge as the center. This ensures that during the shearing process, the axis of the capillary column and the center of the first arc-shaped part 211 are always on the same coaxial trajectory, and the relative position of the notch and the circular limiting hole always corresponds to each other, avoiding misalignment of the cut or damage to the capillary column due to positional deviation. The shapes of the two second arc-shaped portions 212 coincide with the two arc-shaped motion trajectories formed by the movement of the two diameter endpoints on the first arc-shaped portion 211 during shearing. This ensures that the motion path of the second arc-shaped portion 212 is collinear with the motion trajectory of the diameter endpoints of the first arc-shaped portion 211 during shearing. This not only ensures the spatial positional accuracy of the second arc-shaped portion when it initially contacts the column, but also enables it to form a continuous and uninterrupted cutting trajectory with the first arc-shaped portion during the cutting process. This avoids cutting interference or stress concentration caused by deviation of the motion trajectory, ensuring the smoothness of the shearing action and the integrity of the cutting.

[0023] Once the shearing action is initiated, the cutting edges 22 of the second arc-shaped sections 212 on both sides can precisely advance along the movement trajectory of the endpoints of the first arc-shaped section 211, forming a highly conforming arc-shaped cutting path with the outer wall of the capillary column that is contacted first. As the shearing process continues, the movement trajectory of the second arc-shaped section 212 remains consistent with the trajectory of the endpoints of the first arc-shaped section 211. This avoids additional friction or gaps between the cutting edges 22 and the column due to trajectory deviation, and ensures that the cutting paths on both sides are seamlessly connected with the subsequent cutting paths of the first arc-shaped section 211, forming a continuous and uninterrupted overall cutting trajectory. This trajectory overlap design ensures the stability of the cutting sequence of the two sides first and the middle follow, and makes the force of the three cutting edges 22 evenly distributed along the circumference of the column, effectively reducing local force anomalies caused by trajectory misalignment, and improving the smoothness of the shearing action and the consistency of the cut quality. The concave notch in this design (with an internally ground sharp edge) precisely matches the outer wall of the capillary tube, forming a stable, fully fitted contact. Compared to a flat-edged blade, this structure avoids contact shift during cutting, ensuring a complete and more consistent cutting stroke. It also increases the effective contact area between the blade and the capillary tube, improving the uniformity of cutting force and achieving a more precise and smooth cutting effect. Furthermore, the concave notch increases the cutting stroke, guaranteeing the cutting effect.

[0024] The first arc-shaped portion 211 and the second arc-shaped portion 212 are both provided with the blade 22 on their side walls. The entire contact area of ​​the notch has cutting capability, which increases the effective cutting area, improves the uniformity of cutting force, and ensures smooth and precise cutting of the quartz capillary column.

[0025] In a specific embodiment, the inner diameter of the circular limiting hole 11 is 0.1 mm larger than the outer diameter of the quartz capillary column to be sheared, which facilitates the installation of the quartz capillary column. At the same time, it can provide a small amount of movement for the capillary column while ensuring stable positioning, so as to avoid the capillary column being squeezed and deformed during installation due to the hole being too tight, or the column being offset during shearing due to the hole being too loose. Thus, it balances the convenience of operation with the accuracy of shearing positioning.

[0026] In a specific embodiment, the diameters of the circular limiting holes 11 are different, and the circular limiting holes 11 of different diameters are arranged sequentially along the length direction of the cutter head 3 of the first half body 1, which can be adapted to quartz capillary columns with different outer diameters. The cutting operation of columns of multiple specifications can be completed without changing the special cutting tool, which improves the versatility and ease of use of the tool and meets diverse precision cutting needs.

[0027] In a specific embodiment, the diameters of the first arc-shaped portions 211 of the plurality of notches 21 are different, and the different notches 21 of the plurality of first arc-shaped portions 211 with different diameters are arranged sequentially along the length direction of the blade head 3 of the second half-body 2; this enables each notch 21 to be precisely matched with the circular limiting holes of corresponding diameter on the first half-body 1, which not only avoids spatial interference between notches 21 of different specifications, but also adapts to quartz capillary columns of different outer diameters, allowing for the cutting operation of multi-specification columns without changing tools, thus improving the applicability and flexibility of this scissors; the length of the blade head 3 can be set according to actual usage needs. In this embodiment, the thickness of the blade head 3 can be set to 3mm; the thickness of the cutting edge can be set to 0.1mm-0.5mm.

[0028] In a specific embodiment, the diameter of the first arc-shaped portion 211 ranges from 0.25mm to 0.53mm; the diameters of the first arc-shaped portions 211 of the plurality of notches 21 are 0.25mm, 0.32mm and 0.53mm respectively, which are compatible with mainstream quartz capillary columns with outer diameters of 0.25mm, 0.32mm and 0.53mm, thereby improving the versatility and ease of use of the tool and meeting the needs of routine experimental shearing; the diameter of the first arc-shaped portion can also be designed to other sizes to meet actual usage requirements.

[0029] In a specific embodiment, the inner diameter of the circular limiting hole 11 ranges from 0.26mm to 0.54mm; the inner diameters of several of the circular limiting holes 11 are 0.26mm, 0.33mm and 0.54mm respectively, so as to accurately match the capillary column of the corresponding specification, taking into account both the ease of installation and the positioning stability during shearing, and ensuring the flatness of the quartz capillary column cut.

[0030] In a specific embodiment, both the first half 1 and the second half 2 are provided with hinged threaded holes. The first half 1 and the second half are connected by screws passing through the hinged threaded holes to achieve a rotatable hinged fit between the two, while ensuring structural stability during the shearing process and facilitating subsequent disassembly, maintenance and component adjustment.

[0031] The procedure for using this special quartz capillary column shears is as follows: First, the operator holds the knife handle with one hand, and then inserts the quartz capillary column to be cut into the corresponding circular limiting hole 11 with the other hand. The quartz capillary column is limited and fixed by the circular limiting hole 11. Then, the operator gently supports the quartz capillary column with his hand, and then the operator slowly applies force with the two knife handles to make the first half 1 and the second half 2 close relative to each other to form a shearing force. The quartz capillary column is cut off by the cooperation of the notch 21 and the circular limiting hole, and finally a flat cut is achieved on the column.

[0032] 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 special pair of scissors for quartz capillary columns, characterized in that, The device includes a first half (1) and a second half (2) hinged to the first half (1). Both the first half (1) and the second half (2) include a cutting head (3) and a handle (4) connected to the cutting head (3). The cutting head (3) of the first half (1) is provided with a plurality of circular limiting holes (11) for placing the quartz capillary column to be cut. The second half (2) is provided with a plurality of notches (21) that can cooperate with the circular limiting holes (11) to cut the quartz capillary column. The inner edge of the notch (21) is provided with a cutting edge (22) for cutting the quartz capillary column. During shearing, the arc-shaped trajectory formed by the movement of the notch (21) around the hinge of the first half (1) and the second half (2) coincides with the arc-shaped trajectory formed by the movement of the circular limiting hole (11) that cooperates with the notch (21) to perform shearing around the hinge.

2. The quartz capillary column scissors according to claim 1, characterized in that, The notch (21) includes a first arc-shaped portion (211) and two second arc-shaped portions (212) located on both sides of the first arc-shaped portion (211) and connected thereto; the first arc-shaped portion (211) is a semi-circular arc and its diameter is equal to the outer diameter of the quartz capillary column to be cut; The center of the first arc-shaped part (211) and the center of the circular limiting hole (11) that shears with it are both located on the same arc with the hinge point as the center. The two second arc-shaped portions (212) coincide with the two circular arc motion trajectories formed by the movement of the two diameter endpoints on the first arc-shaped portion (211) during shearing; The blade (22) is provided on the sidewalls of the first arc-shaped part (211) and the second arc-shaped part (212).

3. The quartz capillary column scissors according to claim 1, characterized in that, The inner diameter of the circular limiting hole (11) is 0.1 mm larger than the outer diameter of the quartz capillary column to be sheared.

4. The quartz capillary column scissors according to claim 1, characterized in that, The diameters of the circular limiting holes (11) are different, and the circular limiting holes (11) of different diameters are arranged sequentially along the length direction of the cutter head (3) of the first half (1).

5. The quartz capillary column scissors according to claim 2, characterized in that, The diameters of the first arc-shaped portions (211) of the several notches (21) are different, and the different notches (21) of the several first arc-shaped portions (211) with different diameters are arranged sequentially along the length direction of the cutter head (3) of the second half (2).

6. The quartz capillary column scissors according to claim 2, characterized in that, The diameter of the first arc-shaped portion (211) ranges from 0.25 mm to 0.53 mm.

7. The quartz capillary column scissors according to claim 6, characterized in that, The diameters of the first arc-shaped portion (211) of several of the notches (21) are 0.25 mm, 0.32 mm and 0.53 mm, respectively.

8. The quartz capillary column scissors according to claim 1, characterized in that, The inner diameter of the circular limiting hole (11) ranges from 0.26mm to 0.54mm.

9. The quartz capillary column scissors according to claim 8, characterized in that, The inner diameters of several of the circular limiting holes (11) are 0.26 mm, 0.33 mm and 0.54 mm, respectively.

10. The quartz capillary column scissors according to claim 1, characterized in that, The first half (1) and the second half (2) are both provided with hinged threaded holes (5), and the first half (1) and the second half (2) are connected by screws passing through the hinged threaded holes (5).

Images