Clamp for sample preparation
By designing a sample preparation fixture containing a cutting groove and a positioning table, the problem of poor contact between the sample and the crucible in DSC sample preparation is solved, and the accurate cutting and smoothing of the sample is achieved, and the accuracy of the measurement results is improved.
Patent Information
- Application Number
- CN202420742994.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-10
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-04-10
AI Technical Summary
During the DSC sample preparation process, the sample has poor contact with the crucible, resulting in uneven thermal conductivity and affecting the melting temperature measurement results. It is difficult for the prior art to control the thickness and flatness of the sample.
A sample preparation fixture is designed, including a sample preparation platform and a connecting seat, with a cutting groove and a positioning table on the platform. The positioning table is equipped with a stepped thickness positioning area, a rectangular width positioning area and an inclined rectangular tangent angle positioning area for precise cutting and positioning of samples.
It realizes the rapid cutting of large pieces of samples into samples that meet the DSC sample preparation requirements, ensures the surface of the sample is flat, improves the accuracy and reliability of the measurement results, and has a wide range of applications.
Smart Images
Figure CN222882400U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sample making tools, in particular to a sample making fixture. Background Art
[0002] DSC (Differential Scanning Calorimetry) sample preparation has a great influence on the test results. When testing the melting temperature of plastics, if the contact surface between the sample and the crucible is uneven, the sample thickness is uneven, or the sample thickness is too large, the sample and the crucible will have poor contact, and even cause the crucible to deform when the cover is added, affecting the heat conduction between the sample and the crucible, and between the crucible and the sensor. The heat conduction is too slow, which ultimately makes the melting temperature measurement result too high.
[0003] The current sample preparation method is to first cut the sample into small pieces with a tube scissors, and then use nozzle pliers, scalpels, angle scissors, etc. to make samples of the required weight. The nozzle pliers usually have gaps in a week, and the sample becomes uneven; the scalpel can replace the blade, but the scalpel is generally used for soft tissue, and it takes a lot of force to cut harder plastic samples. The blade is easy to break and fly out, which is easy to cause accidents, and the handle has a small force area, which is easy to cause strain on the operator's hands. Using angle scissors can get a sample with a smooth cut surface, but the thickness is thick. When a thinner sample needs to be cut, it is easy to cut it sideways, and usually the scalpel needs to be processed again. Nozzle pliers, scalpels, etc. cannot control the sample thickness and thickness uniformity, which can easily cause deviations in the results. When testing the oxidation induction time of plastics, we also tried to use a punching machine to prepare the sample. The OIT test results of the sample were shorter than before, and after punching, the plastic sample shrank, and the remaining sample often tightly wrapped the pressure head, requiring a lot of force to get out. When testing the gelation degree of PVC-U, the bottom of the sample is not flat, which can easily cause an irregular curve and make it impossible to read the value. In addition, PVC-U is harder than other plastics such as PP and PE. When cutting with a scalpel, the force is applied quickly, which can easily make the sample brittle and unable to obtain a flat surface.
[0004] Therefore, for DSC sample preparation, a device is needed to facilitate the preparation of samples that meet the requirements. Utility Model Content
[0005] In order to solve the above technical problems, the technical solution of the utility model is as follows: a sample preparation fixture, including a sample preparation platform and a connecting seat, the connecting seat is installed at the bottom of the sample preparation platform, a cutting groove is opened on the upper part of the sample preparation platform, a positioning platform is installed on the upper part of the sample preparation platform, and a stepped thickness positioning area, a rectangular width positioning area and an inclined rectangular cutting corner positioning area are provided on the side of the positioning platform close to the cutting groove.
[0006] Preferably, a free cutting area is provided at the upper end of the sample preparation platform, which facilitates the division of large blocks into small blocks and can be used flexibly according to circumstances without being restricted by the positioning platform.
[0007] Preferably, the upper end of the connecting seat is connected to the middle of the sample preparation platform to form a T-shape. The T-shape is convenient for connecting other devices for fixation and occupies little space. The vertical connecting seat is convenient for opening and connecting.
[0008] Preferably, the connecting seat is provided with a mounting hole and may also be provided with a bolt hole.
[0009] Preferably, the stepped thickness positioning area includes a first thickness positioning area, a second thickness positioning area and a third thickness positioning area, and the distances between the first thickness positioning area, the second thickness positioning area and the third thickness positioning area and the cutting groove increase successively.
[0010] Preferably, the first thickness positioning zone, the second thickness positioning zone and the third thickness positioning zone are respectively 0.75 mm, 1 mm or 1.5 mm away from the cutting groove.
[0011] Preferably, the inclined rectangular corner cutting positioning area is an inclined rectangular groove, and the inclination angle of the inclined rectangular corner cutting positioning area is 45 degrees.
[0012] Preferably, the farthest end of the inclined rectangular corner cutting positioning area is 5.75 mm away from the cutting groove, and the width of the inclined rectangular corner cutting positioning area is 5 mm.
[0013] Preferably, the rectangular width positioning area is a rectangular groove, and the inner wall of the rectangular inner groove is 4.6 mm away from the cutting groove.
[0014] Preferably, the depth of the cutting groove is 1 mm, which is conducive to complete cutting and is not prone to burrs.
[0015] Compared with the prior art, the beneficial effects of the technical solution of the utility model are:
[0016] The utility model provides a sample preparation fixture, which adopts a sample preparation platform to position the sample for cutting processing, sets a cutting groove for positioning cutting, adopts a positioning table to determine data such as cutting thickness, width and cutting angle, and can quickly cut a large sample into a sample that meets the DSC sample preparation requirements; and can also quickly cut thinner samples, so that the sample surface is flat, easy to operate during testing, and highly practical; and by adjusting the specifications of the positioning table, it can be suitable for samples of different specifications, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;
[0018] Figure 2 Another three-dimensional structural schematic diagram of the utility model;
[0019] Figure 3 This is a schematic diagram of the front view structure of the utility model;
[0020] Figure 4 This is a schematic diagram of the top view structure of the utility model;
[0021] Figure 5 This is a side view of the structure of the utility model;
[0022] Figure 6 It is a schematic diagram of the sample preparation process structure;
[0023] Figure 7 It is a schematic diagram of the three-dimensional structure of the utility model and the angle shear assembly;
[0024] Figure 8 It is a schematic diagram of the three-dimensional structure of the utility model and the angle shear assembly;
[0025] Fig. 9 It is a schematic diagram of the top view of the structure of the utility model and the angle shear assembly;
[0026] Among them: 100, angle shear; 200, sample; 1, sample preparation platform; 2, connecting seat; 3, cutting groove; 4, positioning table; 5, stepped thickness positioning area; 6, rectangular width positioning area; 7, inclined rectangular cutting corner positioning area; 101, free cutting area; 201, mounting hole; 501, first thickness positioning area; 502, second thickness positioning area; 503, third thickness positioning area. DETAILED DESCRIPTION
[0027] The drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. Technologies, methods, and devices known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be considered part of the authorization specification. In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated; nor do they indicate the importance of components, and therefore cannot be understood as limiting the present invention.
[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
[0029] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0030] Embodiment 1:
[0031] refer to Figure 1-5 As shown, a sample preparation fixture includes a sample preparation platform 1 and a connecting seat 2, the connecting seat 2 is installed at the bottom of the sample preparation platform 1, a cutting groove 3 is opened on the upper part of the sample preparation platform 1, a positioning platform 4 is installed on the upper part of the sample preparation platform 1, and a stepped thickness positioning area 5, a rectangular width positioning area 6 and an inclined rectangular cutting corner positioning area 7 are arranged on the side of the positioning platform 4 close to the cutting groove 3.
[0032] The sample preparation platform 1 of the device is used to place the sample to be cut, wherein the connection seat 2 is used to fix the entire device. Since the sample needs to be cut after being placed on the sample preparation platform 1, the connection seat 2 is used to connect with the installation part, such as a processing table, angle scissors or other devices for cutting, and then the cutting part is aligned with the cutting groove 3 of the sample preparation platform 1, and the sample thickness is cut according to the stepped thickness positioning area 5, the sample width is cut according to the rectangular width positioning area 6, and the inclined rectangular cutting corner positioning area 7 is used to cut off the four corners of the sample to obtain an octagonal sample. The cut sample is used for DSC testing;
[0033] During specific use, refer to Figure 1-6As shown, the sample 200 is first cut into small pieces, and then the front end of the small piece is placed close to the stepped thickness positioning area 5, and the other end is located on the cutting groove 3 and the upper part of the sample preparation platform 1, that is, the side without the positioning platform 4 is supported, and then the cutting is performed along the length direction of the cutting groove 3, and the distance between the cutting groove 3 and the stepped thickness positioning area 5 is the thickness of the sample 200 after cutting, and then the end of the sample 200 with a determined thickness is laid flat and extended into the rectangular width positioning area 6, and the front end is close to the inner wall of the rectangular width positioning area 6, and then the cutting device is cut along the cutting groove 3, and the distance between the cutting groove 3 and the inner wall of the rectangular width positioning area 6 is the width of the sample after cutting, and then the four corners of the sample 200 with a determined width are successively extended into the inclined rectangular cutting corner positioning area 7, and the corner end is close to the inner wall of the inclined rectangular cutting corner positioning area 7, and then the cutting device is cut along the cutting groove 3, and the corner cutting is completed to obtain an octagonal sample.
[0034] In a further embodiment, reference is made to Figure 3-4 As shown, a free cutting area 101 is provided at the upper end of the sample preparation platform 1, and the free cutting area 101 does not have a positioning platform 4, so as to facilitate the sample segmentation.
[0035] In a further embodiment, reference is made to Figure 5 As shown, the upper end of the connecting seat 2 is connected to the middle of the sample preparation platform 1 to form a T-shape, and the T-shape is convenient for stable connection and saves space.
[0036] In a further embodiment, reference is made to Figure 2 As shown, the connecting seat 2 is provided with a mounting hole 201 for connecting a cutting device such as an angle shear.
[0037] Embodiment 2:
[0038] refer to Figure 1-5 As shown, a sample preparation fixture, the stepped thickness positioning area 5 includes a first thickness positioning area 501, a second thickness positioning area 502 and a third thickness positioning area 503, and the distances between the first thickness positioning area 501, the second thickness positioning area 502 and the third thickness positioning area 503 and the cutting groove 3 increase successively.
[0039] refer to Figure 1 As shown, the stepped thickness positioning zone 5 includes a first thickness positioning zone 501, a second thickness positioning zone 502 and a third thickness positioning zone 503 which are at different distances from the cutting groove 3. The first thickness positioning zone 501 is at the smallest distance from the cutting groove 3, and the third thickness positioning zone 503 is at the largest distance from the cutting groove 3. A stepped shape is formed between the first thickness positioning zone 501, the second thickness positioning zone 502 and the third thickness positioning zone 503, which facilitates cutting the sample 200 into specimens of different thicknesses.
[0040] In a further embodiment, reference is made to Figure 4 As shown, the first thickness positioning area 501, the second thickness positioning area 502 and the third thickness positioning area 503 are respectively 0.75 mm, 1 mm or 1.5 mm away from the cutting groove 3, so a sample slice with a thickness of 0.75 mm, 1 mm or 1.5 mm can be cut.
[0041] In a further embodiment, reference is made to Figure 4 As shown, the inclined rectangular corner cutting positioning area 7 is an inclined rectangular groove, and the inclination angle of the inclined rectangular corner cutting positioning area 7 is 45 degrees. By using a rectangular groove with an inclination angle of 45 degrees, when cutting the square, as long as its end is inserted into the rectangular groove for cutting, the sample can be cut along 45 degrees to obtain a regular octagon.
[0042] In a further embodiment, reference is made to Figure 4 As shown, the farthest end of the inclined rectangular corner cutting positioning area 7 is 35.75 mm away from the cutting groove, and the width of the inclined rectangular corner cutting positioning area 7 is 5 mm.
[0043] In a further embodiment, reference is made to Figure 4 As shown, the rectangular width positioning area 6 is a rectangular groove, and the inner wall of the rectangular inner groove is 4.6 mm away from the cutting groove 3.
[0044] In a further embodiment, reference is made to Figure 5 As shown, the depth of the cutting groove 3 is 1 mm, and the cutting groove 3 is relative to the sample preparation platform 1 .
[0045] Embodiment 3:
[0046] refer to Figure 6-9 As shown, the bottom of the angle shears 100 is connected to the sample preparation fixture of the utility model, specifically, the connecting seat 2 is connected to the bottom of the angle shears 100, and the scissors part of the angle shears 100 cuts the groove 3 along the length. When the angle shears 100 is used, the scissors blade part will perform closed cutting in the cutting groove 3.
[0047] In the specific implementation process, the handle of the angle shear 100 is closest to the free cutting area 101, the resistance arm is shorter, and it is more labor-saving, which is suitable for cutting a large sample 200 into small pieces. The small sample 200 is placed close to the second thickness positioning area 502 of the stepped thickness positioning area 5, and then the handle of the angle shear 100 is gripped to cut the sample 200 into a thin sheet with a thickness of 1 mm; then the sample 200 is extended into the rectangular groove of the rectangular width positioning area 6, and the sample 200 is further cut into a 4.6 mm × 4.6 mm square sample 200; then the four corners of the square sample 200 are cut off to obtain a regular octagonal sample 200 with the longest diagonal of 5 mm, which is used for DSC testing.
[0048] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.
Claims
1. A sample preparation fixture, characterized in that: The invention comprises a sample preparation platform (1) and a connecting seat (2), wherein the connecting seat (2) is mounted on the bottom of the sample preparation platform (1), a cutting groove (3) is provided on the top of the sample preparation platform (1), a positioning platform (4) is mounted on the top of the sample preparation platform (1), and a stepped thickness positioning area (5), a rectangular width positioning area (6) and an inclined rectangular cutting angle positioning area (7) are arranged on a side of the positioning platform (4) close to the cutting groove (3).
2. A sample preparation fixture according to claim 1, characterized in that: A free cutting area (101) is provided at the upper end of the sample preparation platform (1).
3. A sample preparation fixture according to claim 1, characterized in that: The upper end of the connecting seat (2) is connected to the middle of the sample preparation platform (1) to form a T-shape.
4. A sample preparation fixture according to claim 1, characterized in that: The connecting seat (2) is provided with a mounting hole (201).
5. A sample preparation fixture according to any one of claims 1 to 4, characterized in that: The stepped thickness positioning zone (5) comprises a first thickness positioning zone (501), a second thickness positioning zone (502) and a third thickness positioning zone (503), and the distances between the first thickness positioning zone (501), the second thickness positioning zone (502) and the third thickness positioning zone (503) and the cutting groove (3) increase successively.
6. A sample preparation fixture according to claim 5, characterized in that: The first thickness positioning zone (501), the second thickness positioning zone (502) and the third thickness positioning zone (503) are respectively 0.75 mm, 1 mm or 1.5 mm away from the cutting groove (3).
7. A sample preparation fixture according to any one of claims 1 to 4, characterized in that: The inclined rectangular corner cutting positioning area (7) is an inclined rectangular groove, and the inclination angle of the inclined rectangular corner cutting positioning area (7) is 45 degrees.
8. A sample preparation fixture according to claim 7, characterized in that: The farthest end of the inclined rectangular corner cutting positioning area (7) is 5.75 mm away from the cutting groove (3), and the width of the inclined rectangular corner cutting positioning area (7) is 5 mm.
9. A sample preparation fixture according to any one of claims 1 to 4, characterized in that: The rectangular width positioning area (6) is a rectangular groove, and the inner wall of the rectangular inner groove is 4.6 mm away from the cutting groove (3).
10. A sample preparation fixture according to any one of claims 1 to 4, characterized in that: The depth of the cutting groove (3) is 1 mm.